Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!sgi!vjs@rhyolite.wpd.sgi.com
From: vjs@rhyolite.wpd.sgi.com (Vernon Schryver)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: TCP/IP performance
Summary: script to run ttpc
Keywords: ttcp blast benchmark
Message-ID: <39013@sgi.SGI.COM>
Date: 27 Jul 89 19:49:28 GMT
References: <38103@sgi.SGI.COM>
Sender: daemon@sgi.SGI.COM
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 70


Since there has been substantial traffic to the ttcp.c I offered for
anonymous ftp, here is a script for running ttcp.  I'm told that one does
something like "script 1" on the receiver and "script 1 rcvr" on the
sender.  One should first turn off all deamons, including YP, routed,
gated, etc. and shut off the window system--provided that you want to
measure pure, maximum TCP or UDP.  The effect of these other things on the
numbers is very interesting, but not obviously relevant in this forum.


 ----------------
#!/bin/csh -f

set udp=""
#set udp="-u"

set lengths=(0005 0128 0256 0512 1024 1536 2048 3072 3584 4096 5120 5400 6144 7168 8192)

set numBufs=25000
if ("$2" == "") then
    set op=r
#    if (-e Count) then
#	@ run=`cat Count`
#	@ run++
#	echo $run >! Count
#    else
#	echo 1 > Count
#	@ run = 1
#    endif
else
    set op=t
#    @ run = `cat Count`
endif
set run = $1
@ port = 4000 + $run * 100
echo "Starting $udp run $run"
set output=$op$run
cp /dev/null $output
foreach buflen ($lengths)
    echo "$buflen, port = $port"
    if ($op == t) then
	echo "" >> $output
	./ttcp -t $udp -p$port -n$numBufs -l$buflen $2 >> $output
	sleep 2
    else
	echo "" >> $output
	./ttcp -r $udp -p$port -n$numBufs -l8192 >> $output
	sleep 1
    endif
    @ port++
end


 ----------------

Someone ambitious should enhance ttcp to take a list of buffer sizes and
numbers of passes for each size, and compute means.  It would also be
better if it took a buffer size & a total transmission size, and divided
to compute the number of buffers to write.

It would be nice to find a public domain package to generate a postscript
plot of the results.  The hills and valleys give insites into buffering
problems and successes.  If the numbers are good, it also makes good sales
fodder.  We use something internally, but it turns out to be private
property.


Vernon Schryver
Silicon Graphics
vjs@sgi.com