1 #! /bin/sh 2 # 3 # Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 4 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 # 6 # This code is free software; you can redistribute it and/or modify it 7 # under the terms of the GNU General Public License version 2 only, as 8 # published by the Free Software Foundation. 9 # 10 # This code is distributed in the hope that it will be useful, but WITHOUT 11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 # version 2 for more details (a copy is included in the LICENSE file that 14 # accompanied this code). 15 # 16 # You should have received a copy of the GNU General Public License version 17 # 2 along with this work; if not, write to the Free Software Foundation, 18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 # 20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 # or visit www.oracle.com if you need additional information or have any 22 # questions. 23 # 24 # 25 26 # This script is used only from top.make. 27 # The macro $(MFLAGS-adjusted) calls this script to 28 # adjust the "-j" arguments to take into account 29 # the HOTSPOT_BUILD_JOBS variable. The default 30 # handling of the "-j" argument by gnumake does 31 # not meet our needs, so we must adjust it ourselves. 32 33 # This argument adjustment applies to two recursive 34 # calls to "$(MAKE) $(MFLAGS-adjusted)" in top.make. 35 # One invokes adlc.make, and the other invokes vm.make. 36 # The adjustment propagates the desired concurrency 37 # level down to the sub-make (of the adlc or vm). 38 # The default behavior of gnumake is to run all 39 # sub-makes without concurrency ("-j1"). 40 41 # Also, we use a make variable rather than an explicit 42 # "-j<N>" argument to control this setting, so that 43 # the concurrency setting (which must be tuned separately 44 # for each MP system) can be set via an environment variable. 45 # The recommended setting is 1.5x to 2x the number of available 46 # CPUs on the MP system, which is large enough to keep the CPUs 47 # busy (even though some jobs may be I/O bound) but not too large, 48 # we may presume, to overflow the system's swap space. 49 50 set -eu 51 52 default_build_jobs=4 53 54 case $# in 55 [12]) true;; 56 *) >&2 echo "Usage: $0 ${MFLAGS} ${HOTSPOT_BUILD_JOBS}"; exit 2;; 57 esac 58 59 MFLAGS=$1 60 HOTSPOT_BUILD_JOBS=${2-} 61 62 # Normalize any -jN argument to the form " -j${HBJ}" 63 MFLAGS=` 64 echo "$MFLAGS" \ 65 | sed ' 66 s/^-/ -/ 67 s/ -\([^ I][^ I]*\)j/ -\1 -j/ 68 s/ -j[0-9][0-9]*/ -j/ 69 s/ -j\([^ ]\)/ -j -\1/ 70 s/ -j/ -j'${HOTSPOT_BUILD_JOBS:-${default_build_jobs}}'/ 71 ' ` 72 73 case ${HOTSPOT_BUILD_JOBS} in \ 74 75 '') case ${MFLAGS} in 76 *\ -j*) 77 >&2 echo "# Note: -jN is ineffective for setting parallelism in this makefile." 78 >&2 echo "# please set HOTSPOT_BUILD_JOBS=${default_build_jobs} in the command line or environment." 79 esac;; 80 81 ?*) case ${MFLAGS} in 82 *\ -j*) true;; 83 *) MFLAGS="-j${HOTSPOT_BUILD_JOBS} ${MFLAGS}";; 84 esac;; 85 esac 86 87 echo "${MFLAGS}"