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From: Erich Focht <efocht@ess.nec.de>
To: "Martin J. Bligh" <mbligh@aracnet.com>,
       William Lee Irwin III <wli@holomorphy.com>
Subject: node affine NUMA scheduler: simple benchmark
Date: Mon, 23 Sep 2002 20:19:55 +0200
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Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       LSE <lse-tech@lists.sourceforge.net>, Ingo Molnar <mingo@elte.hu>,
       Michael Hohnbaum <hohnbaum@us.ibm.com>
References: <200209221030.32323.efocht@ess.nec.de> <78206124.1032689516@[10.10.2.3]>
In-Reply-To: <78206124.1032689516@[10.10.2.3]>
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Here is a simple benchmark which is NUMA sensitive and simulates a simple
but normal situation in an environment running number crunching jobs. It
starts N independent tasks which access a large array in a random manner.
This is both bandwidth and latency sensitive. The output shows on which
node(s) the tasks have spent their lives. Additionally it shows (on a
NUMA scheduler kernel) the homenode (iSched).

Could you please run it on the virgin kernel and on the
"Both numasched patches, hack node IDs, alloc from current->node" one?

Maybe we see what's wrong...

Thanks,
Erich

--------------Boundary-00=_7LLWHE2EB2RRQH1F9G5F
Content-Type: application/x-shellscript;
  name="rand_updt"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="rand_updt"

#!/bin/bash
#
# Small synthetic benchmark sensitive to both memory
# access latency and memory bandwidth. The perl script
# starts NTASKS processes in parallel which access their
# memory following a random pattern.
#
# This benchmark is thought as test for the capability of
# ccNUMA platforms to provide minimum memory access latency
# and maximize the memory bandwidth available for the
# processes in parallel. The table printed after all NTASKS
# processes finished to run shows the percentage of time
# spent by the "jobs" on each node. It also outputs the
# node on which the job was initially scheduled and the node on
# which the job spent most of its time (iSched, MSched). If
# these are different, an asterisc is printed.
# Ideally most of the time should be spent on the node where the
# memory is allocated.
#
# Copyright 2001, Erich Focht <efocht@ess.nec.de>
#

if [ $# != "1" ]; then
  echo "$#"
  echo "Usage: $0 NTASKS"
  exit 1
fi

NTASKS=$1
PROBLEMSIZE=1000000
tmpdir=rupdt_$$

####################
if [ ! -f cpu_to_node ]; then
  echo "Please create a file called cpu_to_node in the current directory!"
  echo "It must contain the node numbers for each logical CPU in the system,"
  echo "separated by blanks. For example: 4 nodes of 4 cpus each could"
  echo "look like:"
  echo "echo \"0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3\" >cpu_to_node"
  exit 1
fi
mkdir $tmpdir || { echo "Could not create run directory!"; exit 1; }
cd $tmpdir
cp ../cpu_to_node .

uudecode << 'UUU_EOF'
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`
end
UUU_EOF
bzip2 -d randupdt.c.bz2
gcc -O3 -o randupdt randupdt.c


############################
cat >print_hz.c <<EOF
#include <asm/param.h>
int main(){ printf("%d\n",HZ);}
EOF
gcc -o print_hz print_hz.c

############################
uudecode << 'UUU_EOF'
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`
end
UUU_EOF
bzip2 -d dispatch.bz2
chmod +x dispatch

################
# Run the tests!
################
'time' --format="ElapsedTime     %e\nTotalUserTime   %U\nTotalSysTime    %S\n" \
   ./dispatch $NTASKS ./randupdt $PROBLEMSIZE

cd ..
rm -rf $tmpdir

--------------Boundary-00=_7LLWHE2EB2RRQH1F9G5F--

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