88 lines
2.9 KiB
Bash
88 lines
2.9 KiB
Bash
#! /bin/sh
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#
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# Copyright 1999 Sun Microsystems, Inc. All Rights Reserved.
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# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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#
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# This code is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 only, as
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# published by the Free Software Foundation.
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#
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# This code is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# version 2 for more details (a copy is included in the LICENSE file that
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# accompanied this code).
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#
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# You should have received a copy of the GNU General Public License version
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# 2 along with this work; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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# CA 95054 USA or visit www.sun.com if you need additional information or
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# have any questions.
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#
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#
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# This script is used only from top.make.
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# The macro $(MFLAGS-adjusted) calls this script to
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# adjust the "-j" arguments to take into account
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# the HOTSPOT_BUILD_JOBS variable. The default
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# handling of the "-j" argument by gnumake does
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# not meet our needs, so we must adjust it ourselves.
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# This argument adjustment applies to two recursive
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# calls to "$(MAKE) $(MFLAGS-adjusted)" in top.make.
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# One invokes adlc.make, and the other invokes vm.make.
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# The adjustment propagates the desired concurrency
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# level down to the sub-make (of the adlc or vm).
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# The default behavior of gnumake is to run all
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# sub-makes without concurrency ("-j1").
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# Also, we use a make variable rather than an explicit
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# "-j<N>" argument to control this setting, so that
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# the concurrency setting (which must be tuned separately
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# for each MP system) can be set via an environment variable.
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# The recommended setting is 1.5x to 2x the number of available
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# CPUs on the MP system, which is large enough to keep the CPUs
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# busy (even though some jobs may be I/O bound) but not too large,
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# we may presume, to overflow the system's swap space.
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set -eu
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default_build_jobs=4
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case $# in
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[12]) true;;
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*) >&2 echo "Usage: $0 ${MFLAGS} ${HOTSPOT_BUILD_JOBS}"; exit 2;;
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esac
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MFLAGS=$1
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HOTSPOT_BUILD_JOBS=${2-}
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# Normalize any -jN argument to the form " -j${HBJ}"
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MFLAGS=`
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echo "$MFLAGS" \
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| sed '
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s/^-/ -/
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s/ -\([^ ][^ ]*\)j/ -\1 -j/
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s/ -j[0-9][0-9]*/ -j/
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s/ -j\([^ ]\)/ -j -\1/
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s/ -j/ -j'${HOTSPOT_BUILD_JOBS:-${default_build_jobs}}'/
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' `
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case ${HOTSPOT_BUILD_JOBS} in \
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'') case ${MFLAGS} in
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*\ -j*)
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>&2 echo "# Note: -jN is ineffective for setting parallelism in this makefile."
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>&2 echo "# please set HOTSPOT_BUILD_JOBS=${default_build_jobs} in the command line or environment."
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esac;;
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?*) case ${MFLAGS} in
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*\ -j*) true;;
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*) MFLAGS="-j${HOTSPOT_BUILD_JOBS} ${MFLAGS}";;
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esac;;
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esac
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echo "${MFLAGS}"
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