get-nprocessors.sh (2220B)
1 #!/usr/bin/env bash 2 # Copyright 2017 Google Inc. 3 # All Rights Reserved. 4 # 5 # 6 # Redistribution and use in source and binary forms, with or without 7 # modification, are permitted provided that the following conditions are 8 # met: 9 # 10 # * Redistributions of source code must retain the above copyright 11 # notice, this list of conditions and the following disclaimer. 12 # * Redistributions in binary form must reproduce the above 13 # copyright notice, this list of conditions and the following disclaimer 14 # in the documentation and/or other materials provided with the 15 # distribution. 16 # * Neither the name of Google Inc. nor the names of its 17 # contributors may be used to endorse or promote products derived from 18 # this software without specific prior written permission. 19 # 20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 32 # This file is typically sourced by another script. 33 # if possible, ask for the precise number of processors, 34 # otherwise take 2 processors as reasonable default; see 35 # https://docs.travis-ci.com/user/speeding-up-the-build/#Makefile-optimization 36 if [ -x /usr/bin/getconf ]; then 37 NPROCESSORS=$(/usr/bin/getconf _NPROCESSORS_ONLN) 38 else 39 NPROCESSORS=2 40 fi 41 42 # as of 2017-09-04 Travis CI reports 32 processors, but GCC build 43 # crashes if parallelized too much (maybe memory consumption problem), 44 # so limit to 4 processors for the time being. 45 if [ $NPROCESSORS -gt 4 ] ; then 46 echo "$0:Note: Limiting processors to use by make from $NPROCESSORS to 4." 47 NPROCESSORS=4 48 fi