Posts by mindc
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1) Message boards : Number crunching : Intel Atom (Message 9558)
Posted 2 Feb 2009 by Profile mindc
What kind of RAC can one expect from 1 Atom 330 setup?


RAC is 2,817.54 now
with HT enabled, on linux 32bit, with optimized app
2) Message boards : Application Code Discussion : Recompiled Linux 32/64 apps (Message 8922)
Posted 24 Jan 2009 by Profile mindc
1 - It's been known in the open source community and Intel's response was that they cannot guarantee their compiler except on their processors, fair enough. Is this new enough for you?

2 - 1% is too close to noise to call a boost.


1. It seems you are right.
2. But I've made more tests:

averaged boost in calculation times for 126 runs of milkyway app on idle machine
SSE3 app: 121.86%
SSE2 app: 119.03%
base app: 100.00%

I don't think this is 'noise' only...
I'm confused now...
Maybe this is milkyway specific...


3) Message boards : Application Code Discussion : Recompiled Linux 32/64 apps (Message 8898)
Posted 23 Jan 2009 by Profile mindc
The SSE3 code runs very well on AMD LE-1600, like C2D with the same clock.
I use icpc -xO for this.

At run-time the processor is probed and if it's by AMD, then degraded code is run instead of the SSE3 code.

See http://techreport.com/discussions.x/8547 for a snippet.

HTH


1. This article is very old: 11:58 AM on July 13, 2005
2. I've got a lot better performance with SSE2 (20% boost) than without it, and slightly better performance with SSE3 than SSE2 (another 1% boost) and I'm talking about AMD chip and milkyway app of course.


4) Message boards : Application Code Discussion : Recompiled Linux 32/64 apps (Message 8838)
Posted 22 Jan 2009 by Profile mindc
The Intel compiler runs degraded code when run on AMD processors. The highest SSE level that it runs on AMD processors is SSE2.

HTH


The SSE3 code runs very well on AMD LE-1600, like C2D with the same clock.
I use icpc -xO for this.
5) Message boards : Application Code Discussion : problem with checkpoints? (Message 8813)
Posted 21 Jan 2009 by Profile mindc
Since new assimilator/validator arrive, I've got problem with WUs, which has been restarted. This kind of WUs, are all marked as Invalid. Any clues?
6) Message boards : Number crunching : Vote for the MilkyWay favicon! (Message 8768)
Posted 20 Jan 2009 by Profile mindc
#9
7) Message boards : Number crunching : post milkyway_i686-pc-linux-gnu problems here (Message 7115)
Posted 1 Dec 2008 by Profile mindc
And what with linux machines with gcc libs older than 4.2.0?

cheers
mindc




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