#!/bin/bash
###########################################################################
##                                                                       ##
##                   Carnegie Mellon University and                      ##
##                           Alok Parlikar                               ##
##                         Copyright (c) 2012                            ##
##                        All Rights Reserved.                           ##
##                                                                       ##
##  Permission is hereby granted, free of charge, to use and distribute  ##
##  this software and its documentation without restriction, including   ##
##  without limitation the rights to use, copy, modify, merge, publish,  ##
##  distribute, sublicense, and/or sell copies of this work, and to      ##
##  permit persons to whom this work is furnished to do so, subject to   ##
##  the following conditions:                                            ##
##   1. The code must retain the above copyright notice, this list of    ##
##      conditions and the following disclaimer.                         ##
##   2. Any modifications must be clearly marked as such.                ##
##   3. Original authors' names are not deleted.                         ##
##   4. The authors' names are not used to endorse or promote products   ##
##      derived from this software without specific prior written        ##
##      permission.                                                      ##
##                                                                       ##
##  CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK         ##
##  DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING      ##
##  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT   ##
##  SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE      ##
##  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES    ##
##  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN   ##
##  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,          ##
##  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF       ##
##  THIS SOFTWARE.                                                       ##
##                                                                       ##
###########################################################################
#
#  When using multiple threads/processes, finds out the number of cpu
#  that can be used. 
#
SYS=`uname`

if [ $SYS = "Darwin" ]
then
  num_cpus=$(sysctl -n hw.ncpu)
else
  num_cpus=$(cat /proc/cpuinfo 2>/dev/null | grep '^processor' | wc -l )
fi

if [ $num_cpus -gt 1 ]
then
    echo $num_cpus
else
    echo 1
fi
