1 #! /bin/sh

     2 #

     3 # Copyright (c) 1999, 2013, 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}"