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8078582: java/lang/Runtime/exec/LotsOfOutput.java fails intermittently with Process consumes memory

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Small allocations may bump total memory, raise THRESHOLD to 2Mb

Reviewed-by: martin
This commit is contained in:
Roger Riggs 2015-05-20 11:17:09 -04:00
parent a3ea97f915
commit b7d8c57908
1 changed files with 24 additions and 11 deletions
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35
jdk/test/java/lang/Runtime/exec/LotsOfOutput.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2002, 2015, 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
@ -23,12 +23,22 @@
/**
* @test
* @bug 4369826
* @bug 4369826 8078582
* @summary Process with lots of output should not crash VM
* @key intermittent
* @author kladko
*/
public class LotsOfOutput {
static final Runtime runtime = Runtime.getRuntime();
// Allow memory to grow by up to 1Mb total
static final int THRESHOLD = 1048576;
// Compute used memory
static long usedMemory() {
return runtime.totalMemory() - runtime.freeMemory();
}
public static void main(String[] args) throws Exception {
if (! UnixCommands.isUnix) {
@ -37,18 +47,21 @@ public class LotsOfOutput {
}
UnixCommands.ensureCommandsAvailable("cat");
Process p = Runtime.getRuntime().exec(UnixCommands.cat() + " /dev/zero");
long initMemory = Runtime.getRuntime().totalMemory();
for (int i=1; i< 10; i++) {
Process p = runtime.exec(UnixCommands.cat() + " /dev/zero");
long initMemory = usedMemory();
boolean growing = false;
for (int i = 1; i < 10; i++) {
Thread.sleep(100);
long totalMemory = Runtime.getRuntime().totalMemory();
if (totalMemory != initMemory) {
System.out.printf("consuming memory: i: %d, initial: %d, total: %d, delta: %d%n",
i, initMemory, totalMemory, totalMemory - initMemory);
long used = usedMemory();
if (used != initMemory) {
System.out.printf("consuming memory: i: %d, initial: %d, used: %d, delta: %d%n",
i, initMemory, used, used - initMemory);
}
if (totalMemory > initMemory + 1000000)
throw new Exception("Process consumes memory.");
if (used > initMemory + THRESHOLD)
growing = true;
}
if (growing)
throw new Exception("Process consumes memory.");
}
}