Whetstone on Dual boot Linux - Windows differ a factor


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Message boards : Number crunching : Whetstone on Dual boot Linux - Windows differ a factor

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Profile Huibert Kreb
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Netherlands
Message 12288 - Posted: 25 Jul 2004, 9:29:24 UTC

How can one machine give different Whetstone numbers when running under Linux versus Windows? Should these numbers not be the same PER DEFINITION?
And the WU processing time is equal on both instances...

Netvista onder windows: (Windows XP Home)
Number of CPUs: 1
1350 double precision MIPS (Whetstone) per CPU
2403 integer MIPS (Dhrystone) per CPU

Netvista onder Linux: (RHEL 3.0)
Number of CPUs: 1
575 double precision MIPS (Whetstone) per CPU
1193 integer MIPS (Dhrystone) per CPU

Any suggestions?
Huibert

Profile G.A.Waldenmeier@home_Project
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Liechtenstein
Message 12290 - Posted: 25 Jul 2004, 9:34:38 UTC

maybe people build boinc on M$ 7.0 C++ Compiler
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Phantasie ist wichtiger als Wissen,denn Wissen ist begrenzt.Albert Einstein

guidoprost
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Germany
Message 12329 - Posted: 25 Jul 2004, 11:30:55 UTC

I think the problem is that the Linux client is compiled without any optimizations turned on at all. I experimented a little bit a while ago and posted a little howto here: http://setiweb.ssl.berkeley.edu/forum_thread.php?id=1350

My benchmarks nearly doubled, it is still not the same as Windows on my dual boot machine, but at least it's an improvement.
Just make sure you find out about the right compiler flags for your computer first.

BTW, I have received credit since I switched to my self-compiled version, so that's no problem as long as you don't use -ffast-math or something else that messes with precision.

Another hint: don't use the newest sources (version 4+), they won't work yet. I think I'm using 07-11 boinc and 07-12 seti at the moment.

Message boards : Number crunching : Whetstone on Dual boot Linux - Windows differ a factor

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