1 #! /bin/sh
   2 #
   3 # Copyright (c) 1999, 2008, 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/ -\([^        ][^     ]*\)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}"