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This commit is contained in:
Suchen Chien 2011-05-11 18:52:46 -07:00
commit 70185c760f
10 changed files with 1541 additions and 1 deletions
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14
jdk/make/java/management/Makefile
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@ -63,6 +63,20 @@ else # PLATFORM (i.e. solaris & linux)
FILES_c += UnixOperatingSystem_md.c
FILES_export += com/sun/management/UnixOperatingSystem.java
ifeq ($(PLATFORM),solaris)
FILES_c += SolarisOperatingSystem.c
OTHER_LDLIBS += -lkstat
endif # PLATFORM solaris
ifeq ($(PLATFORM),linux)
FILES_c += LinuxOperatingSystem.c
endif # PLATFORM linux
endif # PLATFORM
#

2
jdk/make/java/management/mapfile-vers
View File

@ -32,7 +32,9 @@ SUNWprivate_1.1 {
Java_com_sun_management_UnixOperatingSystem_getFreeSwapSpaceSize;
Java_com_sun_management_UnixOperatingSystem_getMaxFileDescriptorCount;
Java_com_sun_management_UnixOperatingSystem_getOpenFileDescriptorCount;
Java_com_sun_management_UnixOperatingSystem_getProcessCpuLoad;
Java_com_sun_management_UnixOperatingSystem_getProcessCpuTime;
Java_com_sun_management_UnixOperatingSystem_getSystemCpuLoad;
Java_com_sun_management_UnixOperatingSystem_getTotalPhysicalMemorySize;
Java_com_sun_management_UnixOperatingSystem_getTotalSwapSpaceSize;
Java_com_sun_management_UnixOperatingSystem_initialize;

35
jdk/src/share/classes/com/sun/management/OperatingSystemMXBean.java
View File

@ -92,4 +92,39 @@ public interface OperatingSystemMXBean extends
* @return the total amount of physical memory in bytes.
*/
public long getTotalPhysicalMemorySize();
/**
* Returns the "recent cpu usage" for the whole system. This value is a
* double in the [0.0,1.0] interval. A value of 0.0 means that all CPUs
* were idle during the recent period of time observed, while a value
* of 1.0 means that all CPUs were actively running 100% of the time
* during the recent period being observed. All values betweens 0.0 and
* 1.0 are possible depending of the activities going on in the system.
* If the system recent cpu usage is not available, the method returns a
* negative value.
*
* @return the "recent cpu usage" for the whole system; a negative
* value if not available.
* @since 1.7
*/
public double getSystemCpuLoad();
/**
* Returns the "recent cpu usage" for the Java Virtual Machine process.
* This value is a double in the [0.0,1.0] interval. A value of 0.0 means
* that none of the CPUs were running threads from the JVM process during
* the recent period of time observed, while a value of 1.0 means that all
* CPUs were actively running threads from the JVM 100% of the time
* during the recent period being observed. Threads from the JVM include
* the application threads as well as the JVM internal threads. All values
* betweens 0.0 and 1.0 are possible depending of the activities going on
* in the JVM process and the whole system. If the Java Virtual Machine
* recent CPU usage is not available, the method returns a negative value.
*
* @return the "recent cpu usage" for the Java Virtual Machine process;
* a negative value if not available.
* @since 1.7
*/
public double getProcessCpuLoad();
}

2
jdk/src/solaris/classes/com/sun/management/UnixOperatingSystem.java
View File

@ -50,6 +50,8 @@ class UnixOperatingSystem
public native long getTotalPhysicalMemorySize();
public native long getOpenFileDescriptorCount();
public native long getMaxFileDescriptorCount();
public native double getSystemCpuLoad();
public native double getProcessCpuLoad();
static {
initialize();

332
jdk/src/solaris/native/com/sun/management/LinuxOperatingSystem.c Normal file
View File

@ -0,0 +1,332 @@
/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <pthread.h>
#include "com_sun_management_UnixOperatingSystem.h"
struct ticks {
uint64_t used;
uint64_t usedKernel;
uint64_t total;
};
typedef struct ticks ticks;
typedef enum {
CPU_LOAD_VM_ONLY,
CPU_LOAD_GLOBAL,
} CpuLoadTarget;
static struct perfbuf {
int nProcs;
ticks jvmTicks;
ticks cpuTicks;
ticks *cpus;
} counters;
#define DEC_64 "%lld"
static void next_line(FILE *f) {
while (fgetc(f) != '\n');
}
/**
* Return the total number of ticks since the system was booted.
* If the usedTicks parameter is not NULL, it will be filled with
* the number of ticks spent on actual processes (user, system or
* nice processes) since system boot. Note that this is the total number
* of "executed" ticks on _all_ CPU:s, that is on a n-way system it is
* n times the number of ticks that has passed in clock time.
*
* Returns a negative value if the reading of the ticks failed.
*/
static int get_totalticks(int which, ticks *pticks) {
FILE *fh;
uint64_t userTicks, niceTicks, systemTicks, idleTicks;
int n;
if((fh = fopen("/proc/stat", "r")) == NULL) {
return -1;
}
n = fscanf(fh, "cpu " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64,
&userTicks, &niceTicks, &systemTicks, &idleTicks);
// Move to next line
next_line(fh);
//find the line for requested cpu faster to just iterate linefeeds?
if (which != -1) {
int i;
for (i = 0; i < which; i++) {
if (fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64, &userTicks, &niceTicks, &systemTicks, &idleTicks) != 4) {
fclose(fh);
return -2;
}
next_line(fh);
}
n = fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 "\n",
&userTicks, &niceTicks, &systemTicks, &idleTicks);
}
fclose(fh);
if (n != 4) {
return -2;
}
pticks->used = userTicks + niceTicks;
pticks->usedKernel = systemTicks;
pticks->total = userTicks + niceTicks + systemTicks + idleTicks;
return 0;
}
static int vread_statdata(const char *procfile, const char *fmt, va_list args) {
FILE *f;
int n;
char buf[2048];
if ((f = fopen(procfile, "r")) == NULL) {
return -1;
}
if ((n = fread(buf, 1, sizeof(buf), f)) != -1) {
char *tmp;
buf[n-1] = '\0';
/** skip through pid and exec name. the exec name _could be wacky_ (renamed) and
* make scanf go mupp.
*/
if ((tmp = strrchr(buf, ')')) != NULL) {
// skip the ')' and the following space but check that the buffer is long enough
tmp += 2;
if (tmp < buf + n) {
n = vsscanf(tmp, fmt, args);
}
}
}
fclose(f);
return n;
}
static int read_statdata(const char *procfile, const char *fmt, ...) {
int n;
va_list args;
va_start(args, fmt);
n = vread_statdata(procfile, fmt, args);
va_end(args);
return n;
}
/** read user and system ticks from a named procfile, assumed to be in 'stat' format then. */
static int read_ticks(const char *procfile, uint64_t *userTicks, uint64_t *systemTicks) {
return read_statdata(procfile, "%*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u "DEC_64" "DEC_64,
userTicks, systemTicks
);
}
/**
* Return the number of ticks spent in any of the processes belonging
* to the JVM on any CPU.
*/
static int get_jvmticks(ticks *pticks) {
uint64_t userTicks;
uint64_t systemTicks;
if (read_ticks("/proc/self/stat", &userTicks, &systemTicks) < 0) {
return -1;
}
// get the total
if (get_totalticks(-1, pticks) < 0) {
return -1;
}
pticks->used = userTicks;
pticks->usedKernel = systemTicks;
return 0;
}
/**
* This method must be called first, before any data can be gathererd.
*/
int perfInit() {
static int initialized=1;
if (!initialized) {
int i;
int n = sysconf(_SC_NPROCESSORS_ONLN);
if (n <= 0) {
n = 1;
}
counters.cpus = calloc(n,sizeof(ticks));
if (counters.cpus != NULL) {
// For the CPU load
get_totalticks(-1, &counters.cpuTicks);
for (i = 0; i < n; i++) {
get_totalticks(i, &counters.cpus[i]);
}
// For JVM load
get_jvmticks(&counters.jvmTicks);
initialized = 1;
}
}
return initialized ? 0 : -1;
}
#define MAX(a,b) (a>b?a:b)
#define MIN(a,b) (a<b?a:b)
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
/**
* Return the load of the CPU as a double. 1.0 means the CPU process uses all
* available time for user or system processes, 0.0 means the CPU uses all time
* being idle.
*
* Returns a negative value if there is a problem in determining the CPU load.
*/
static double get_cpuload_internal(int which, double *pkernelLoad, CpuLoadTarget target) {
uint64_t udiff, kdiff, tdiff;
ticks *pticks, tmp;
double user_load = -1.0;
int failed = 0;
*pkernelLoad = 0.0;
pthread_mutex_lock(&lock);
if(perfInit() == 0) {
if (target == CPU_LOAD_VM_ONLY) {
pticks = &counters.jvmTicks;
} else if (which == -1) {
pticks = &counters.cpuTicks;
} else {
pticks = &counters.cpus[which];
}
tmp = *pticks;
if (target == CPU_LOAD_VM_ONLY) {
if (get_jvmticks(pticks) != 0) {
failed = 1;
}
} else if (get_totalticks(which, pticks) < 0) {
failed = 1;
}
if(!failed) {
// seems like we sometimes end up with less kernel ticks when
// reading /proc/self/stat a second time, timing issue between cpus?
if (pticks->usedKernel < tmp.usedKernel) {
kdiff = 0;
} else {
kdiff = pticks->usedKernel - tmp.usedKernel;
}
tdiff = pticks->total - tmp.total;
udiff = pticks->used - tmp.used;
if (tdiff == 0) {
user_load = 0;
} else {
if (tdiff < (udiff + kdiff)) {
tdiff = udiff + kdiff;
}
*pkernelLoad = (kdiff / (double)tdiff);
// BUG9044876, normalize return values to sane values
*pkernelLoad = MAX(*pkernelLoad, 0.0);
*pkernelLoad = MIN(*pkernelLoad, 1.0);
user_load = (udiff / (double)tdiff);
user_load = MAX(user_load, 0.0);
user_load = MIN(user_load, 1.0);
}
}
}
pthread_mutex_unlock(&lock);
return user_load;
}
double get_cpu_load(int which) {
double u, s;
u = get_cpuload_internal(which, &s, CPU_LOAD_GLOBAL);
if (u < 0) {
return -1.0;
}
// Cap total systemload to 1.0
return MIN((u + s), 1.0);
}
double get_process_load() {
double u, s;
u = get_cpuload_internal(-1, &s, CPU_LOAD_VM_ONLY);
if (u < 0) {
return -1.0;
}
return u + s;
}
JNIEXPORT jdouble JNICALL
Java_com_sun_management_UnixOperatingSystem_getSystemCpuLoad
(JNIEnv *env, jobject dummy)
{
if(perfInit() == 0) {
return get_cpu_load(-1);
} else {
return -1.0;
}
}
JNIEXPORT jdouble JNICALL
Java_com_sun_management_UnixOperatingSystem_getProcessCpuLoad
(JNIEnv *env, jobject dummy)
{
if(perfInit() == 0) {
return get_process_load();
} else {
return -1.0;
}
}

241
jdk/src/solaris/native/com/sun/management/SolarisOperatingSystem.c Normal file
View File

@ -0,0 +1,241 @@
/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <fcntl.h>
#include <kstat.h>
#include <procfs.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/sysinfo.h>
#include <sys/lwp.h>
#include <pthread.h>
#include <utmpx.h>
#include <dlfcn.h>
#include <sys/loadavg.h>
#include <jni.h>
#include "jvm.h"
#include "com_sun_management_UnixOperatingSystem.h"
typedef struct {
kstat_t *kstat;
uint64_t last_idle;
uint64_t last_total;
double last_ratio;
} cpuload_t;
static cpuload_t *cpu_loads = NULL;
static unsigned int num_cpus;
static kstat_ctl_t *kstat_ctrl = NULL;
static void map_cpu_kstat_counters() {
kstat_t *kstat;
int i;
// Get number of CPU(s)
if ((num_cpus = sysconf(_SC_NPROCESSORS_ONLN)) == -1) {
num_cpus = 1;
}
// Data structure for saving CPU load
if ((cpu_loads = calloc(num_cpus,sizeof(cpuload_t))) == NULL) {
return;
}
// Get kstat cpu_stat counters for every CPU
// (loop over kstat to find our cpu_stat(s)
i = 0;
for (kstat = kstat_ctrl->kc_chain; kstat != NULL; kstat = kstat->ks_next) {
if (strncmp(kstat->ks_module, "cpu_stat", 8) == 0) {
if (kstat_read(kstat_ctrl, kstat, NULL) == -1) {
// Failed to initialize kstat for this CPU so ignore it
continue;
}
if (i == num_cpus) {
// Found more cpu_stats than reported CPUs
break;
}
cpu_loads[i++].kstat = kstat;
}
}
}
static int init_cpu_kstat_counters() {
static int initialized = 0;
// Concurrence in this method is prevented by the lock in
// the calling method get_cpu_load();
if(!initialized) {
if ((kstat_ctrl = kstat_open()) != NULL) {
map_cpu_kstat_counters();
initialized = 1;
}
}
return initialized ? 0 : -1;
}
static void update_cpu_kstat_counters() {
if(kstat_chain_update(kstat_ctrl) != 0) {
free(cpu_loads);
map_cpu_kstat_counters();
}
}
int read_cpustat(cpuload_t *load, cpu_stat_t *cpu_stat) {
if (load->kstat == NULL) {
// no handle.
return -1;
}
if (kstat_read(kstat_ctrl, load->kstat, cpu_stat) == -1) {
// disabling for now, a kstat chain update is likely to happen next time
load->kstat = NULL;
return -1;
}
return 0;
}
double get_single_cpu_load(unsigned int n) {
cpuload_t *load;
cpu_stat_t cpu_stat;
uint_t *usage;
uint64_t c_idle;
uint64_t c_total;
uint64_t d_idle;
uint64_t d_total;
int i;
if (n >= num_cpus) {
return -1.0;
}
load = &cpu_loads[n];
if (read_cpustat(load, &cpu_stat) < 0) {
return -1.0;
}
usage = cpu_stat.cpu_sysinfo.cpu;
c_idle = usage[CPU_IDLE];
for (c_total = 0, i = 0; i < CPU_STATES; i++) {
c_total += usage[i];
}
// Calculate diff against previous snapshot
d_idle = c_idle - load->last_idle;
d_total = c_total - load->last_total;
/** update if weve moved */
if (d_total > 0) {
// Save current values for next time around
load->last_idle = c_idle;
load->last_total = c_total;
load->last_ratio = (double) (d_total - d_idle) / d_total;
}
return load->last_ratio;
}
int get_info(const char *path, void *info, size_t s, off_t o) {
int fd;
int ret = 0;
if ((fd = open(path, O_RDONLY)) < 0) {
return -1;
}
if (pread(fd, info, s, o) != s) {
ret = -1;
}
close(fd);
return ret;
}
#define MIN(a, b) ((a < b) ? a : b)
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
/**
* Return the cpu load (0-1) for proc number 'which' (or average all if which == -1)
*/
double get_cpu_load(int which) {
double load =.0;
pthread_mutex_lock(&lock);
if(init_cpu_kstat_counters()==0) {
update_cpu_kstat_counters();
if (which == -1) {
unsigned int i;
double t;
for (t = .0, i = 0; i < num_cpus; i++) {
t += get_single_cpu_load(i);
}
// Cap total systemload to 1.0
load = MIN((t / num_cpus), 1.0);
} else {
load = MIN(get_single_cpu_load(which), 1.0);
}
} else {
load = -1.0;
}
pthread_mutex_unlock(&lock);
return load;
}
/**
* Return the cpu load (0-1) for the current process (i.e the JVM)
* or -1.0 if the get_info() call failed
*/
double get_process_load(void) {
psinfo_t info;
// Get the percentage of "recent cpu usage" from all the lwp:s in the JVM:s
// process. This is returned as a value between 0.0 and 1.0 multiplied by 0x8000.
if (get_info("/proc/self/psinfo",&info.pr_pctcpu, sizeof(info.pr_pctcpu), offsetof(psinfo_t, pr_pctcpu)) == 0) {
return (double) info.pr_pctcpu / 0x8000;
}
return -1.0;
}
JNIEXPORT jdouble JNICALL
Java_com_sun_management_UnixOperatingSystem_getSystemCpuLoad
(JNIEnv *env, jobject dummy)
{
return get_cpu_load(-1);
}
JNIEXPORT jdouble JNICALL
Java_com_sun_management_UnixOperatingSystem_getProcessCpuLoad
(JNIEnv *env, jobject dummy)
{
return get_process_load();
}

2
jdk/src/windows/classes/com/sun/management/OperatingSystem.java
View File

@ -58,6 +58,8 @@ class OperatingSystem
public native long getProcessCpuTime();
public native long getFreePhysicalMemorySize();
public native long getTotalPhysicalMemorySize();
public native double getSystemCpuLoad();
public native double getProcessCpuLoad();
static {
initialize();

808
jdk/src/windows/native/com/sun/management/OperatingSystem_md.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -34,9 +34,27 @@
#include <errno.h>
#include <stdlib.h>
#include <malloc.h>
#pragma warning (push,0)
#include <windows.h>
#pragma warning (pop)
#include <stdio.h>
#include <time.h>
#include <stdint.h>
#include <assert.h>
/* Disable warnings due to broken header files from Microsoft... */
#pragma warning(push, 3)
#include <pdh.h>
#include <pdhmsg.h>
#include <process.h>
#pragma warning(pop)
typedef unsigned __int32 juint;
typedef unsigned __int64 julong;
typedef enum boolean_values { false=0, true=1};
static void set_low(jlong* value, jint low) {
*value &= (jlong)0xffffffff << 32;
*value |= (jlong)(julong)(juint)low;
@ -56,11 +74,14 @@ static jlong jlong_from(jint h, jint l) {
static HANDLE main_process;
int perfiInit(void);
JNIEXPORT void JNICALL
Java_com_sun_management_OperatingSystem_initialize
(JNIEnv *env, jclass cls)
{
main_process = GetCurrentProcess();
perfiInit();
}
JNIEXPORT jlong JNICALL
@ -132,3 +153,788 @@ Java_com_sun_management_OperatingSystem_getTotalPhysicalMemorySize
GlobalMemoryStatus(&ms);
return ms.dwTotalPhys;
}
// Seems WinXP PDH returns PDH_MORE_DATA whenever we send in a NULL buffer.
// Let's just ignore it, since we make sure we have enough buffer anyway.
static int
pdh_fail(PDH_STATUS pdhStat) {
return pdhStat != ERROR_SUCCESS && pdhStat != PDH_MORE_DATA;
}
// INFO: Using PDH APIs Correctly in a Localized Language (Q287159)
// http://support.microsoft.com/default.aspx?scid=kb;EN-US;q287159
// The index value for the base system counters and objects like processor,
// process, thread, memory, and so forth are always the same irrespective
// of the localized version of the operating system or service pack installed.
#define PDH_PROCESSOR_IDX ((DWORD) 238)
#define PDH_PROCESSOR_TIME_IDX ((DWORD) 6)
#define PDH_PRIV_PROCESSOR_TIME_IDX ((DWORD) 144)
#define PDH_PROCESS_IDX ((DWORD) 230)
#define PDH_ID_PROCESS_IDX ((DWORD) 784)
#define PDH_CONTEXT_SWITCH_RATE_IDX ((DWORD) 146)
#define PDH_SYSTEM_IDX ((DWORD) 2)
#define PDH_VIRTUAL_BYTES_IDX ((DWORD) 174)
typedef PDH_STATUS (WINAPI *PdhAddCounterFunc)(
HQUERY hQuery,
LPCSTR szFullCounterPath,
DWORD dwUserData,
HCOUNTER *phCounter
);
typedef PDH_STATUS (WINAPI *PdhOpenQueryFunc)(
LPCWSTR szDataSource,
DWORD dwUserData,
HQUERY *phQuery
);
typedef DWORD (WINAPI *PdhCloseQueryFunc)(
HQUERY hQuery
);
typedef PDH_STATUS (WINAPI *PdhCollectQueryDataFunc)(
HQUERY hQuery
);
typedef DWORD (WINAPI *PdhGetFormattedCounterValueFunc)(
HCOUNTER hCounter,
DWORD dwFormat,
LPDWORD lpdwType,
PPDH_FMT_COUNTERVALUE pValue
);
typedef PDH_STATUS (WINAPI *PdhEnumObjectItemsFunc)(
LPCTSTR szDataSource,
LPCTSTR szMachineName,
LPCTSTR szObjectName,
LPTSTR mszCounterList,
LPDWORD pcchCounterListLength,
LPTSTR mszInstanceList,
LPDWORD pcchInstanceListLength,
DWORD dwDetailLevel,
DWORD dwFlags
);
typedef PDH_STATUS (WINAPI *PdhRemoveCounterFunc)(
HCOUNTER hCounter
);
typedef PDH_STATUS (WINAPI *PdhLookupPerfNameByIndexFunc)(
LPCSTR szMachineName,
DWORD dwNameIndex,
LPSTR szNameBuffer,
LPDWORD pcchNameBufferSize
);
typedef PDH_STATUS (WINAPI *PdhMakeCounterPathFunc)(
PDH_COUNTER_PATH_ELEMENTS *pCounterPathElements,
LPTSTR szFullPathBuffer,
LPDWORD pcchBufferSize,
DWORD dwFlags
);
static PdhAddCounterFunc PdhAddCounter_i;
static PdhOpenQueryFunc PdhOpenQuery_i;
static PdhCloseQueryFunc PdhCloseQuery_i;
static PdhCollectQueryDataFunc PdhCollectQueryData_i;
static PdhGetFormattedCounterValueFunc PdhGetFormattedCounterValue_i;
static PdhEnumObjectItemsFunc PdhEnumObjectItems_i;
static PdhRemoveCounterFunc PdhRemoveCounter_i;
static PdhLookupPerfNameByIndexFunc PdhLookupPerfNameByIndex_i;
static PdhMakeCounterPathFunc PdhMakeCounterPath_i;
static HANDLE thisProcess;
static double cpuFactor;
static DWORD num_cpus;
#define FT2JLONG(X) ((((jlong)X.dwHighDateTime) << 32) | ((jlong)X.dwLowDateTime))
#define COUNTER_BUF_SIZE 256
// Min time between query updates.
#define MIN_UPDATE_INTERVAL 500
#define CONFIG_SUCCESSFUL 0
/**
* Struct for PDH queries.
*/
typedef struct {
HQUERY query;
uint64_t lastUpdate; // Last time query was updated (current millis).
} UpdateQueryS, *UpdateQueryP;
/**
* Struct for the processor load counters.
*/
typedef struct {
UpdateQueryS query;
HCOUNTER* counters;
int noOfCounters;
} MultipleCounterQueryS, *MultipleCounterQueryP;
/**
* Struct for the jvm process load counter.
*/
typedef struct {
UpdateQueryS query;
HCOUNTER counter;
} SingleCounterQueryS, *SingleCounterQueryP;
static char* getProcessPDHHeader(void);
/**
* Currently available counters.
*/
static SingleCounterQueryS cntCtxtSwitchRate;
static SingleCounterQueryS cntVirtualSize;
static SingleCounterQueryS cntProcLoad;
static SingleCounterQueryS cntProcSystemLoad;
static MultipleCounterQueryS multiCounterCPULoad;
static CRITICAL_SECTION processHeaderLock;
static CRITICAL_SECTION initializationLock;
/**
* Initialize the perf module at startup.
*/
int
perfiInit(void)
{
InitializeCriticalSection(&processHeaderLock);
InitializeCriticalSection(&initializationLock);
return 0;
}
/**
* Dynamically sets up function pointers to the PDH library.
*
* @return CONFIG_SUCCESSFUL on success, negative on failure.
*/
static int
get_functions(HMODULE h, char *ebuf, size_t elen) {
// The 'A' at the end means the ANSI (not the UNICODE) vesions of the methods
PdhAddCounter_i = (PdhAddCounterFunc)GetProcAddress(h, "PdhAddCounterA");
PdhOpenQuery_i = (PdhOpenQueryFunc)GetProcAddress(h, "PdhOpenQueryA");
PdhCloseQuery_i = (PdhCloseQueryFunc)GetProcAddress(h, "PdhCloseQuery");
PdhCollectQueryData_i = (PdhCollectQueryDataFunc)GetProcAddress(h, "PdhCollectQueryData");
PdhGetFormattedCounterValue_i = (PdhGetFormattedCounterValueFunc)GetProcAddress(h, "PdhGetFormattedCounterValue");
PdhEnumObjectItems_i = (PdhEnumObjectItemsFunc)GetProcAddress(h, "PdhEnumObjectItemsA");
PdhRemoveCounter_i = (PdhRemoveCounterFunc)GetProcAddress(h, "PdhRemoveCounter");
PdhLookupPerfNameByIndex_i = (PdhLookupPerfNameByIndexFunc)GetProcAddress(h, "PdhLookupPerfNameByIndexA");
PdhMakeCounterPath_i = (PdhMakeCounterPathFunc)GetProcAddress(h, "PdhMakeCounterPathA");
if (PdhAddCounter_i == NULL || PdhOpenQuery_i == NULL ||
PdhCloseQuery_i == NULL || PdhCollectQueryData_i == NULL ||
PdhGetFormattedCounterValue_i == NULL || PdhEnumObjectItems_i == NULL ||
PdhRemoveCounter_i == NULL || PdhLookupPerfNameByIndex_i == NULL || PdhMakeCounterPath_i == NULL)
{
_snprintf(ebuf, elen, "Required method could not be found.");
return -1;
}
return CONFIG_SUCCESSFUL;
}
/**
* Returns the counter value as a double for the specified query.
* Will collect the query data and update the counter values as necessary.
*
* @param query the query to update (if needed).
* @param c the counter to read.
* @param value where to store the formatted value.
* @param format the format to use (i.e. PDH_FMT_DOUBLE, PDH_FMT_LONG etc)
* @return CONFIG_SUCCESSFUL if no error
* -1 if PdhCollectQueryData fails
* -2 if PdhGetFormattedCounterValue fails
*/
static int
getPerformanceData(UpdateQueryP query, HCOUNTER c, PDH_FMT_COUNTERVALUE* value, DWORD format) {
clock_t now;
now = clock();
// Need to limit how often we update the query
// to mimise the heisenberg effect.
// (PDH behaves erratically if the counters are
// queried too often, especially counters that
// store and use values from two consecutive updates,
// like cpu load.)
if (now - query->lastUpdate > MIN_UPDATE_INTERVAL) {
if (PdhCollectQueryData_i(query->query) != ERROR_SUCCESS) {
return -1;
}
query->lastUpdate = now;
}
if (PdhGetFormattedCounterValue_i(c, format, NULL, value) != ERROR_SUCCESS) {
return -2;
}
return CONFIG_SUCCESSFUL;
}
/**
* Places the resolved counter name of the counter at the specified index in the
* supplied buffer. There must be enough space in the buffer to hold the counter name.
*
* @param index the counter index as specified in the registry.
* @param buf the buffer in which to place the counter name.
* @param size the size of the counter name buffer.
* @param ebuf the error message buffer.
* @param elen the length of the error buffer.
* @return CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
find_name(DWORD index, char *buf, DWORD size) {
PDH_STATUS res;
if ((res = PdhLookupPerfNameByIndex_i(NULL, index, buf, &size)) != ERROR_SUCCESS) {
/* printf("Could not open counter %d: error=0x%08x", index, res); */
/* if (res == PDH_CSTATUS_NO_MACHINE) { */
/* printf("User probably does not have sufficient privileges to use"); */
/* printf("performance counters. If you are running on Windows 2003"); */
/* printf("or Windows Vista, make sure the user is in the"); */
/* printf("Performance Logs user group."); */
/* } */
return -1;
}
if (size == 0) {
/* printf("Failed to get counter name for %d: empty string", index); */
return -1;
}
// windows vista does not null-terminate the string (allthough the docs says it will)
buf[size - 1] = '\0';
return CONFIG_SUCCESSFUL;
}
/**
* Sets up the supplied SingleCounterQuery to listen for the specified counter.
* initPDH() must have been run prior to calling this function!
*
* @param counterQuery the counter query to set up.
* @param counterString the string specifying the path to the counter.
* @param ebuf the error buffer.
* @param elen the length of the error buffer.
* @returns CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
initSingleCounterQuery(SingleCounterQueryP counterQuery, char *counterString) {
if (PdhOpenQuery_i(NULL, 0, &counterQuery->query.query) != ERROR_SUCCESS) {
/* printf("Could not open query for %s", counterString); */
return -1;
}
if (PdhAddCounter_i(counterQuery->query.query, counterString, 0, &counterQuery->counter) != ERROR_SUCCESS) {
/* printf("Could not add counter %s for query", counterString); */
if (counterQuery->counter != NULL) {
PdhRemoveCounter_i(counterQuery->counter);
}
if (counterQuery->query.query != NULL) {
PdhCloseQuery_i(counterQuery->query.query);
}
memset(counterQuery, 0, sizeof(SingleCounterQueryS));
return -1;
}
return CONFIG_SUCCESSFUL;
}
/**
* Sets up the supplied SingleCounterQuery to listen for the time spent
* by the HotSpot process.
*
* @param counterQuery the counter query to set up as a process counter.
* @param ebuf the error buffer.
* @param elen the length of the error buffer.
* @returns CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
initProcLoadCounter(void) {
char time[COUNTER_BUF_SIZE];
char counter[COUNTER_BUF_SIZE*2];
if (find_name(PDH_PROCESSOR_TIME_IDX, time, sizeof(time)-1) < 0) {
return -1;
}
_snprintf(counter, sizeof(counter)-1, "%s\\%s", getProcessPDHHeader(), time);
return initSingleCounterQuery(&cntProcLoad, counter);
}
static int
initProcSystemLoadCounter(void) {
char time[COUNTER_BUF_SIZE];
char counter[COUNTER_BUF_SIZE*2];
if (find_name(PDH_PRIV_PROCESSOR_TIME_IDX, time, sizeof(time)-1) < 0) {
return -1;
}
_snprintf(counter, sizeof(counter)-1, "%s\\%s", getProcessPDHHeader(), time);
return initSingleCounterQuery(&cntProcSystemLoad, counter);
}
/**
* Sets up the supplied MultipleCounterQuery to check on the processors.
* (Comment: Refactor and prettify as with the the SingleCounter queries
* if more MultipleCounterQueries are discovered.)
*
* initPDH() must have been run prior to calling this function.
*
* @param multiQuery a pointer to a MultipleCounterQueryS, will be filled in with
* the necessary info to check the PDH processor counters.
* @return CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
initProcessorCounters(void) {
char processor[COUNTER_BUF_SIZE]; //'Processor' == #238
char time[COUNTER_BUF_SIZE]; //'Time' == 6
DWORD c_size, i_size;
HQUERY tmpQuery;
DWORD i, p_count;
BOOL error;
char *instances, *tmp;
PDH_STATUS pdhStat;
c_size = i_size = 0;
tmpQuery = NULL;
error = false;
// This __try / __except stuff is there since Windows 2000 beta (or so) sometimes triggered
// an access violation when the user had insufficient privileges to use the performance
// counters. This was previously guarded by a very ugly piece of code which disabled the
// global trap handling in JRockit. Don't know if this really is needed anymore, but otoh,
// if we keep it we don't crash on Win2k beta. /Ihse, 2005-05-30
__try {
if (find_name(PDH_PROCESSOR_IDX, processor, sizeof(processor)-1) < 0) {
return -1;
}
} __except (EXCEPTION_EXECUTE_HANDLER) { // We'll catch all exceptions here.
/* printf("User does not have sufficient privileges to use performance counters"); */
return -1;
}
if (find_name(PDH_PROCESSOR_TIME_IDX, time, sizeof(time)-1) < 0) {
return -1;
}
//ok, now we have enough to enumerate all processors.
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processor, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
NULL, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
if (pdh_fail(pdhStat)) {
/* printf("could not enumerate processors (1) error=%d", pdhStat); */
return -1;
}
// use calloc because windows vista does not null terminate the instance names (allthough the docs says it will)
instances = calloc(i_size, 1);
if (instances == NULL) {
/* printf("could not allocate memory (1) %d bytes", i_size); */
error = true;
goto end;
}
c_size = 0;
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processor, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
instances, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
if (pdh_fail(pdhStat)) {
/* printf("could not enumerate processors (2) error=%d", pdhStat); */
error = true;
goto end;
}
//count perf count instances.
for (p_count = 0, tmp = instances; *tmp != 0; tmp = &tmp[lstrlen(tmp)+1], p_count++);
//is this correct for HT?
assert(p_count == num_cpus+1);
//ok, have number of perf counters.
multiCounterCPULoad.counters = calloc(p_count, sizeof(HCOUNTER));
if (multiCounterCPULoad.counters == NULL) {
/* printf("could not allocate memory (2) count=%d", p_count); */
error = true;
goto end;
}
multiCounterCPULoad.noOfCounters = p_count;
if (PdhOpenQuery_i(NULL, 0, &multiCounterCPULoad.query.query) != ERROR_SUCCESS) {
/* printf("could not create query"); */
error = true;
goto end;
}
//now, fetch the counters.
for (i = 0, tmp = instances; *tmp != '\0'; tmp = &tmp[lstrlen(tmp)+1], i++) {
char counter[2*COUNTER_BUF_SIZE];
_snprintf(counter, sizeof(counter)-1, "\\%s(%s)\\%s", processor, tmp, time);
if (PdhAddCounter_i(multiCounterCPULoad.query.query, counter, 0, &multiCounterCPULoad.counters[i]) != ERROR_SUCCESS) {
/* printf("error adding processor counter %s", counter); */
error = true;
goto end;
}
}
free(instances);
instances = NULL;
// Query once to initialize the counters needing at least two queries
// (like the % CPU usage) to calculate correctly.
if (PdhCollectQueryData_i(multiCounterCPULoad.query.query) != ERROR_SUCCESS)
error = true;
end:
if (instances != NULL) {
free(instances);
}
if (tmpQuery != NULL) {
PdhCloseQuery_i(tmpQuery);
}
if (error) {
int i;
if (multiCounterCPULoad.counters != NULL) {
for (i = 0; i < multiCounterCPULoad.noOfCounters; i++) {
if (multiCounterCPULoad.counters[i] != NULL) {
PdhRemoveCounter_i(multiCounterCPULoad.counters[i]);
}
}
free(multiCounterCPULoad.counters[i]);
}
if (multiCounterCPULoad.query.query != NULL) {
PdhCloseQuery_i(multiCounterCPULoad.query.query);
}
memset(&multiCounterCPULoad, 0, sizeof(MultipleCounterQueryS));
return -1;
}
return CONFIG_SUCCESSFUL;
}
/**
* Help function that initializes the PDH process header for the JRockit process.
* (You should probably use getProcessPDHHeader() instead!)
*
* initPDH() must have been run prior to calling this function.
*
* @param ebuf the error buffer.
* @param elen the length of the error buffer.
*
* @return the PDH instance description corresponding to the JVM process.
*/
static char*
initProcessPDHHeader(void) {
static char hotspotheader[2*COUNTER_BUF_SIZE];
char counter[2*COUNTER_BUF_SIZE];
char processes[COUNTER_BUF_SIZE]; //'Process' == #230
char pid[COUNTER_BUF_SIZE]; //'ID Process' == 784
char module_name[MAX_PATH];
PDH_STATUS pdhStat;
DWORD c_size = 0, i_size = 0;
HQUERY tmpQuery = NULL;
int i, myPid = _getpid();
BOOL error = false;
char *instances, *tmp, *instance_name, *dot_pos;
tmpQuery = NULL;
myPid = _getpid();
error = false;
if (find_name(PDH_PROCESS_IDX, processes, sizeof(processes) - 1) < 0) {
return NULL;
}
if (find_name(PDH_ID_PROCESS_IDX, pid, sizeof(pid) - 1) < 0) {
return NULL;
}
//time is same.
c_size = 0;
i_size = 0;
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processes, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
NULL, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
//ok, now we have enough to enumerate all processes
if (pdh_fail(pdhStat)) {
/* printf("Could not enumerate processes (1) error=%d", pdhStat); */
return NULL;
}
// use calloc because windows vista does not null terminate the instance names (allthough the docs says it will)
if ((instances = calloc(i_size, 1)) == NULL) {
/* printf("Could not allocate memory %d bytes", i_size); */
error = true;
goto end;
}
c_size = 0;
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processes, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
instances, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
// ok, now we have enough to enumerate all processes
if (pdh_fail(pdhStat)) {
/* printf("Could not enumerate processes (2) error=%d", pdhStat); */
error = true;
goto end;
}
if (PdhOpenQuery_i(NULL, 0, &tmpQuery) != ERROR_SUCCESS) {
/* printf("Could not create temporary query"); */
error = true;
goto end;
}
// Find our module name and use it to extract the instance name used by PDH
if (GetModuleFileName(NULL, module_name, MAX_PATH) >= MAX_PATH-1) {
/* printf("Module name truncated"); */
error = true;
goto end;
}
instance_name = strrchr(module_name, '\\'); //drop path
instance_name++; //skip slash
dot_pos = strchr(instance_name, '.'); //drop .exe
dot_pos[0] = '\0';
//now, fetch the counters.
for (tmp = instances; *tmp != 0 && !error; tmp = &tmp[lstrlen(tmp)+1]) {
HCOUNTER hc = NULL;
BOOL done = false;
// Skip until we find our own process name
if (strcmp(tmp, instance_name) != 0) {
continue;
}
// iterate over all instance indexes and try to find our own pid
for (i = 0; !done && !error; i++){
PDH_STATUS res;
_snprintf(counter, sizeof(counter)-1, "\\%s(%s#%d)\\%s", processes, tmp, i, pid);
if (PdhAddCounter_i(tmpQuery, counter, 0, &hc) != ERROR_SUCCESS) {
/* printf("Failed to create process id query"); */
error = true;
goto end;
}
res = PdhCollectQueryData_i(tmpQuery);
if (res == PDH_INVALID_HANDLE) {
/* printf("Failed to query process id"); */
res = -1;
done = true;
} else if (res == PDH_NO_DATA) {
done = true;
} else {
PDH_FMT_COUNTERVALUE cv;
PdhGetFormattedCounterValue_i(hc, PDH_FMT_LONG, NULL, &cv);
/*
* This check seems to be needed for Win2k SMP boxes, since
* they for some reason don't return PDH_NO_DATA for non existing
* counters.
*/
if (cv.CStatus != PDH_CSTATUS_VALID_DATA) {
done = true;
} else if (cv.longValue == myPid) {
_snprintf(hotspotheader, sizeof(hotspotheader)-1, "\\%s(%s#%d)\0", processes, tmp, i);
PdhRemoveCounter_i(hc);
goto end;
}
}
PdhRemoveCounter_i(hc);
}
}
end:
if (instances != NULL) {
free(instances);
}
if (tmpQuery != NULL) {
PdhCloseQuery_i(tmpQuery);
}
if (error) {
return NULL;
}
return hotspotheader;
}
/**
* Returns the PDH string prefix identifying the HotSpot process. Use this prefix when getting
* counters from the PDH process object representing HotSpot.
*
* Note: this call may take some time to complete.
*
* @param ebuf error buffer.
* @param elen error buffer length.
*
* @return the header to be used when retrieving PDH counters from the HotSpot process.
* Will return NULL if the call failed.
*/
static char *
getProcessPDHHeader(void) {
static char *processHeader = NULL;
EnterCriticalSection(&processHeaderLock); {
if (processHeader == NULL) {
processHeader = initProcessPDHHeader();
}
} LeaveCriticalSection(&processHeaderLock);
return processHeader;
}
int perfInit(void);
double
perfGetCPULoad(int which)
{
PDH_FMT_COUNTERVALUE cv;
HCOUNTER c;
if (perfInit() < 0) {
// warn?
return -1.0;
}
if (multiCounterCPULoad.query.query == NULL) {
// warn?
return -1.0;
}
if (which == -1) {
c = multiCounterCPULoad.counters[multiCounterCPULoad.noOfCounters - 1];
} else {
if (which < multiCounterCPULoad.noOfCounters) {
c = multiCounterCPULoad.counters[which];
} else {
return -1.0;
}
}
if (getPerformanceData(&multiCounterCPULoad.query, c, &cv, PDH_FMT_DOUBLE ) == CONFIG_SUCCESSFUL) {
return cv.doubleValue / 100;
}
return -1.0;
}
double
perfGetProcessLoad(void)
{
PDH_FMT_COUNTERVALUE cv;
if (perfInit() < 0) {
// warn?
return -1.0;
}
if (cntProcLoad.query.query == NULL) {
// warn?
return -1.0;
}
if (getPerformanceData(&cntProcLoad.query, cntProcLoad.counter, &cv, PDH_FMT_DOUBLE | PDH_FMT_NOCAP100) == CONFIG_SUCCESSFUL) {
double d = cv.doubleValue / cpuFactor;
d = min(1, d);
d = max(0, d);
return d;
}
return -1.0;
}
/**
* Helper to initialize the PDH library. Loads the library and sets up the functions.
* Note that once loaded, we will never unload the PDH library.
*
* @return CONFIG_SUCCESSFUL if successful, negative on failure.
*/
int
perfInit(void) {
static HMODULE h;
static BOOL running, inited;
int error;
if (running) {
return CONFIG_SUCCESSFUL;
}
error = CONFIG_SUCCESSFUL;
// this is double checked locking again, but we try to bypass the worst by
// implicit membar at end of lock.
EnterCriticalSection(&initializationLock); {
if (!inited) {
char buf[64] = "";
SYSTEM_INFO si;
// CMH. But windows will not care about our affinity when giving
// us measurements. Need the real, raw num cpus.
GetSystemInfo(&si);
num_cpus = si.dwNumberOfProcessors;
// Initialize the denominator for the jvm load calculations
cpuFactor = num_cpus * 100;
/**
* Do this dynamically, so we don't fail to start on systems without pdh.
*/
if ((h = LoadLibrary("pdh.dll")) == NULL) {
/* printf("Could not load pdh.dll (%d)", GetLastError()); */
error = -2;
} else if (get_functions(h, buf, sizeof(buf)) < 0) {
FreeLibrary(h);
h = NULL;
error = -2;
/* printf("Failed to init pdh functions: %s.\n", buf); */
} else {
if (initProcessorCounters() != 0) {
/* printf("Failed to init system load counters.\n"); */
} else if (initProcLoadCounter() != 0) {
/* printf("Failed to init process load counter.\n"); */
} else if (initProcSystemLoadCounter() != 0) {
/* printf("Failed to init process system load counter.\n"); */
} else {
inited = true;
}
}
}
} LeaveCriticalSection(&initializationLock);
if (inited && error == CONFIG_SUCCESSFUL) {
running = true;
}
return error;
}
JNIEXPORT jdouble JNICALL
Java_com_sun_management_OperatingSystem_getSystemCpuLoad
(JNIEnv *env, jobject dummy)
{
return perfGetCPULoad(-1);
}
JNIEXPORT jdouble JNICALL
Java_com_sun_management_OperatingSystem_getProcessCpuLoad
(JNIEnv *env, jobject dummy)
{
return perfGetProcessLoad();
}

53
jdk/test/com/sun/management/OperatingSystemMXBean/GetProcessCpuLoad.java Normal file
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/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 7028071
* @summary Basic unit test of OperatingSystemMXBean.getProcessCpuLoad()
*
* @run main GetProcessCpuLoad
*/
import java.lang.management.*;
import com.sun.management.OperatingSystemMXBean;
public class GetProcessCpuLoad {
public static void main(String[] argv) throws Exception {
OperatingSystemMXBean mbean = (com.sun.management.OperatingSystemMXBean)
ManagementFactory.getOperatingSystemMXBean();
double load;
for(int i=0; i<10; i++) {
load = mbean.getProcessCpuLoad();
if((load<0.0 || load>1.0) && load != -1.0) {
throw new RuntimeException("getProcessCpuLoad() returns " + load
+ " which is not in the [0.0,1.0] interval");
}
try {
Thread.sleep(200);
} catch(InterruptedException e) {
e.printStackTrace();
}
}
}
}

53
jdk/test/com/sun/management/OperatingSystemMXBean/GetSystemCpuLoad.java Normal file
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/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 7028071
* @summary Basic unit test of OperatingSystemMXBean.getProcessCpuLoad()
*
* @run main GetSystemCpuLoad
*/
import java.lang.management.*;
import com.sun.management.OperatingSystemMXBean;
public class GetSystemCpuLoad {
public static void main(String[] argv) throws Exception {
OperatingSystemMXBean mbean = (com.sun.management.OperatingSystemMXBean)
ManagementFactory.getOperatingSystemMXBean();
double load;
for(int i=0; i<10; i++) {
load = mbean.getSystemCpuLoad();
if((load<0.0 || load>1.0) && load != -1.0) {
throw new RuntimeException("getSystemCpuLoad() returns " + load
+ " which is not in the [0.0,1.0] interval");
}
try {
Thread.sleep(200);
} catch(InterruptedException e) {
e.printStackTrace();
}
}
}
}