From: Colin Paul Gloster <Colin_Paul_Gloster@ACM.org>
Subject: Re: multicore-multithreading benchmarks
Date: 22 Dec 2006 17:12:24 GMT
Date: 2006-12-22T17:12:24+00:00 [thread overview]
Message-ID: <emh3lo$idl$1@newsserver.cilea.it> (raw)
In-Reply-To: icednfoKjsdI6hbYnZ2dnUVZ_r2onZ2d@comcast.com
Dear Mr. Moran,
Tom Moran posted in news:g8OdnXUIoJrz2hbYnZ2dnUVZ_v63nZ2d@comcast.com
:
"Karl Nyberg was kind enough to run the N-CPU quicksort test on his
Sun
"Try and Buy" evaluation T1000, with 8 cores, 4 threads per core and
got
the results below. For the large-N cases there is a significant
speedup
when N becomes a larger power of two. That's logical since the number
of
partitions at any given time is a power of two (approximately, since
the
split may not have been exactly even).
[..]
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
[..]
7 0.001457500 0.006942000 0.094361000 0.744371500
8 0.001456750 0.007131000 0.083258000 0.693531250
[..]
7 0.001418250 0.006858750 0.077237750 0.598086250
8 0.001422000 0.007047500 0.074811750 0.481415250
[..]
7 0.001445250 0.007033000 0.096396000 0.929958500
8 0.001444000 0.007120500 0.091150250 0.870250250"
We can note that with N= 10000, 8 CPUs are often slightly slower in
Nyberg's; Alexander's; and my measurements (below) than 7 so-called
"CPUs", though this is not nearly as dramatic as the erratic timings
of finding the first 32 prime numbers in Wai-Mee Ching and Alex Katz,
"An Experimental APL Compiler for a Distributed Memory Parallel
Machine", Supercomputing conference 1994.
Except for my last run, TRYSORTN was the only process reported by top
to be using more than 2 "%CPU". For most of a run of most of the runs,
TRYSORTN was reported by top to be using approximately 41% or
sixty-something% or seventy-something% or 99.9 "%CPU" depending on the
run. I compiled TRYSORTN with gnatmake -O3 and I ran TRYSORTN on a
machine with four x86_64s cores (AMD Opterons) (1.8GHz) which in many
cases was outperformed by the "dual AMD Opteron" which Alexander used
( news:1166492674.379186.85310@t46g2000cwa.googlegroups.com and
news:1166497708.533742.140650@48g2000cwx.googlegroups.com ). It may be
worthwhile if Alexander provides more details (e.g. clock speed), but
these would probably still not justify the slowness of the four AMD
Opterons. If we divide the Sun Niagara T1000's numbers in
news:g8OdnXUIoJrz2hbYnZ2dnUVZ_v63nZ2d@comcast.com by six (
news:icednfoKjsdI6hbYnZ2dnUVZ_r2onZ2d@comcast.com ), many of the
speeds are slower than the "dual AMD Opteron"'s so the approximately
$14445 for the Sun Niagara T1000 might not be value for money.
Regards,
Colin Paul Gloster
time ./TRYSORTN
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
1 0.000085250 0.001124500 0.013804250 0.170973750
2 0.000085250 0.000998500 0.009506500 0.092315750
3 0.000085250 0.000915500 0.008373250 0.081367000
4 0.000085000 0.001170250 0.009327500 0.074474500
5 0.000083750 0.001054250 0.008961750 0.076013750
6 0.000085250 0.001531250 0.009179000 0.075535000
7 0.000083750 0.001367250 0.009538000 0.065402000
8 0.000085250 0.001385250 0.007406250 0.064408750
real 0m4.674s
user 0m8.261s
sys 0m0.096s
time ./TRYSORTN
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
1 0.000081500 0.001108000 0.013810000 0.172433500
2 0.000082750 0.000849500 0.008702750 0.092600250
3 0.000082750 0.001033000 0.010324250 0.074759750
4 0.000082750 0.001243000 0.008898500 0.076791750
5 0.000082750 0.001232500 0.008550500 0.077942000
6 0.000084750 0.001320750 0.008310250 0.077038000
7 0.000082750 0.001440500 0.008635500 0.063810750
8 0.000083000 0.001594750 0.008516750 0.065588750
real 0m5.062s
user 0m8.337s
sys 0m0.100s
time ./TRYSORTN
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
1 0.000083250 0.001178750 0.013625500 0.172203750
2 0.000085000 0.001180750 0.009293750 0.092631750
3 0.000084750 0.001093250 0.009663750 0.076857000
4 0.000089750 0.000881500 0.008177500 0.057204750
5 0.000087000 0.000946500 0.008502000 0.056925750
6 0.000086500 0.001260000 0.007659000 0.057980000
7 0.000083500 0.001646750 0.008052000 0.056552750
8 0.000084750 0.001221000 0.007820750 0.063489000
real 0m4.242s
user 0m8.229s
sys 0m0.056s
time ./TRYSORTN
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
1 0.000089250 0.001124750 0.014132000 0.175325000
2 0.000090750 0.001117750 0.010619000 0.093166000
3 0.000090750 0.000858750 0.009654000 0.079514500
4 0.000091250 0.001423750 0.008418500 0.075662750
5 0.000090500 0.001086250 0.009355750 0.081312750
6 0.000090750 0.001260500 0.009833500 0.077358250
7 0.000091000 0.001032750 0.010370500 0.067873000
8 0.000090500 0.001441750 0.008750250 0.065373250
real 0m4.640s
user 0m8.357s
sys 0m0.124s
time ./TRYSORTN
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
1 0.000082750 0.001063250 0.014282000 0.170518750
2 0.000083750 0.000688250 0.011545500 0.093950500
3 0.000084000 0.000972500 0.010276250 0.085763250
4 0.000082500 0.001058500 0.009569500 0.092093500
5 0.000083000 0.001263500 0.012566750 0.076557250
6 0.000084000 0.001459500 0.009440250 0.074283000
7 0.000082250 0.001378750 0.008399000 0.079315750
8 0.000085750 0.001449000 0.010754750 0.071387000
real 0m4.843s
user 0m8.209s
sys 0m0.128s
time ./TRYSORTN
CPUs N= 1000 N= 10000 N= 100000 N= 1000000
1 0.000090000 0.001139750 0.014450000 0.165776750
2 0.000086250 0.001113000 0.009400250 0.087525750
3 0.000091750 0.001160000 0.008839000 0.082454750
4 0.000088000 0.001009500 0.009091000 0.054664750
5 0.000086250 0.001241500 0.010316250 0.054852750
6 0.000086250 0.001354000 0.009450250 0.053322500
7 0.000086500 0.001272250 0.008177000 0.059826500
8 0.000086250 0.001562500 0.009065750 0.057336250
real 0m4.287s
user 0m8.069s
sys 0m0.064s
gnatmake -v
GNATMAKE 4.0.2 20051125 (Red Hat 4.0.2-8)
Copyright 1995-2004 Free Software Foundation, Inc.
gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix--
----enable-checking=release
--with-system-zlib--
----enable-__cxa_atexit
--disable-libunwind-exceptions--
----enable-libgcj-multifile
--enable-languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --host=x86_64-redhat-linux
Thread model: posix
gcc version 4.0.2 20051125 (Red Hat 4.0.2-8)
uname --all
Linux urano.iet.unipi.it 2.6.16-1.2115_FC4smp #1 SMP Mon Jun 5
15:01:20 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux
next prev parent reply other threads:[~2006-12-22 17:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-22 2:48 multicore-multithreading benchmarks tmoran
2006-12-22 6:14 ` tmoran
2006-12-22 17:12 ` Colin Paul Gloster [this message]
2006-12-23 6:50 ` tmoran
2006-12-26 21:58 ` Chip Orange
2006-12-27 8:57 ` tmoran
2006-12-27 17:53 ` Chip Orange
2006-12-27 18:46 ` Jeffrey Creem
2006-12-27 19:51 ` tmoran
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