Credits per unit dropped from 19.94 to 16.53 on Mac PPC G4, why?

Richard Schumacher
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Topic 191682

Is this because of the new faster code for Windows and Linux?

Bernd Machenschalk
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Credits per unit dropped from 19.94 to 16.53 on Mac PPC G4, why?

Yep. We need to adjust the credit so that we stay on the same level of credit/hour as the other BOINC projects.

BM

BM

Michael Karlinsky
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RE: Is this because of the

Quote:
Is this because of the new faster code for Windows and Linux?

Yes.

Michael

Richard Schumacher
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RE: Yep. We need to adjust

Message 44010 in response to message 44008

Quote:

Yep. We need to adjust the credit so that we stay on the same level of credit/hour as the other BOINC projects.

BM


Will there be faster code for PPC G4 (he asked with despair in his eyes)?

Bernd Machenschalk
Bernd Machenschalk
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RE: Will there be faster

Message 44011 in response to message 44010

Quote:
Will there be faster code for PPC (he asked with despair in his eyes)?


Sorry - didn't throughly read the title...

I am working on it. The App for G5 PPC that's on our Power User page is meant as a first step.

However, I'm not much of a prophet, and if there's one thing I learned from recent coding, it's that it's almost impossible to predict the speedup a particular change would make on a certain CPU. One feature I'm desperately missing in the AltiVec / Velocity Engine (compared to SSE2 on x86) is double precision calculation. We'll see how far I can get with PPC.

BM

BM

Richard Schumacher
Richard Schumacher
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RE: RE: Will there be

Message 44012 in response to message 44011

Quote:
Quote:
Will there be faster code for PPC (he asked with despair in his eyes)?

I couldn't see his machines, as he has them hidden.

I am working on it. The App for G5 PPC that's on our Power User page is meant as a first step.

However, I'm not much of a prophet, and if there's one thing I learned from recent coding, it's that it's almost impossible to predict the speedup a particular change would make on a certain CPU. One feature I'm desperately missing in the AltiVec / Velocity Engine (compared to SSE2 on x86) is double precision calculation. We'll see how far I can get with PPC.

BM


Power Macintosh PowerMac6,4
Darwin 7.9.0

Richard Schumacher
Richard Schumacher
Joined: 8 Aug 06
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RE: RE: Will there be

Message 44013 in response to message 44011

Quote:
Quote:
Will there be faster code for PPC (he asked with despair in his eyes)?

Sorry - didn't throughly read the title...

I am working on it. The App for G5 PPC that's on our Power User page is meant as a first step.

However, I'm not much of a prophet, and if there's one thing I learned from recent coding, it's that it's almost impossible to predict the speedup a particular change would make on a certain CPU. One feature I'm desperately missing in the AltiVec / Velocity Engine (compared to SSE2 on x86) is double precision calculation. We'll see how far I can get with PPC.

BM


Thanks!

Mahbubur
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We've seen a ~17% decrease in

We've seen a ~17% decrease in credit awarded per work unit yet speedups have been 30%+ ??? Not that i mind the extra credit.

DanNeely
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RE: We've seen a ~17%

Message 44015 in response to message 44014

Quote:
We've seen a ~17% decrease in credit awarded per work unit yet speedups have been 30%+ ??? Not that i mind the extra credit.

The reason they're not a 1:1 corespondence is that only x86/SSE (win/linux) were improved by the apps that just went official. X86 NonSSE (mainly older athlon's), mac's, and other *nix platforms saw no speedup. When the current G5 power user app goes live credit/WU will drop again bringing it closer to the old levels for platforms with improved apps. The ones still code dating to the start of S5 will still preclude a complete shift in credit/hour back to the original values.

Crunch3r
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RE: We've seen a ~17%

Message 44016 in response to message 44014

Quote:
We've seen a ~17% decrease in credit awarded per work unit yet speedups have been 30%+ ??? Not that i mind the extra credit.

I don't mid extra credit at all too. :D

But why all this cross project credit calibrating stuff ???
Why can't we leave it the way it is ?

Trog Dog
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RE: RE: We've seen a ~17%

Message 44017 in response to message 44016

Quote:
Quote:
We've seen a ~17% decrease in credit awarded per work unit yet speedups have been 30%+ ??? Not that i mind the extra credit.

I don't mid extra credit at all too. :D

But why all this cross project credit calibrating stuff ???
Why can't we leave it the way it is ?

To avoid a credit war between projects, and the attendant flaming wars that would accompany it.

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