1#!/bin/bash 2 3# Control script for a program that tests shared memory access speeds. 4 5# Copyright (C) 2003-2006 IBM 6# 7# This program is free software; you can redistribute it and/or 8# modify it under the terms of the GNU General Public License as 9# published by the Free Software Foundation; either version 2 of the 10# License, or (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, but 13# WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15# General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, write to the Free Software 19# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 20# 02111-1307, USA. 21 22# Kill anything in this process group 23trap 'kill -9 `pgrep -P $$` 2> /dev/null; exit 0' 1 2 15 24 25# Try to find ramsnake 26PROGRAM="$POUNDER_SRCDIR/ramsnake/snake.exe" 27if [ -z "$PROGRAM" ]; then 28 echo "Cannot find ramsnake; did you run Install?" 29 exit -1 30fi 31 32# We want enough nodes to consume 1/2 of whatever RAM isn't being used 33# for programs or buffers. Note that we must divide again by the number 34# of CPUs in the system so that the _total_ memory used is 1/4. 35# 36# Does the LONG_BIT config variable really refer to the size 37# of a pointer? 38MEM_AVAIL=$(( `grep ^MemFree: /proc/meminfo | awk -F " " '{print $2}'` + `grep ^Cached: /proc/meminfo | awk -F " " '{print $2}'`)) 39NUM_NODES=$(( (MEM_AVAIL * 1024 / (2 * NR_CPUS)) / $((`getconf LONG_BIT` / 8)) )) 40 41# Start up a bunch of ramsnakes in the background. 42for ((k=0; k < $NR_CPUS; k++)) 43do 44 "$POUNDER_HOME/timed_loop" 300 "$PROGRAM" -p $NR_CPUS -n $NUM_NODES & 45done 46 47LOGFILE=/proc/$$/fd/1 48OLD_ERRORS=0 49 50# Check for errors while snake runs. 51while [ `pgrep -P $$ | wc -l` -gt 1 ]; 52do 53 NEW_ERRORS=`egrep -ic "(segmentation|fault|error|illegal)" $LOGFILE` 54 ERRORS=$(( NEW_ERRORS - OLD_ERRORS )) 55 if [ $ERRORS -eq 255 ]; then 56 ERRORS=254 57 fi 58 59 if [ $ERRORS -gt 0 ]; then 60 echo "Program crash detected. Aborting." 61 exit 1 62 fi 63 OLD_ERRORS=$ERRORS 64 sleep 5 65done 66 67# Failures will probably hang the system or segfault snake. 68exit 0 69