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Questions and Answers : Macintosh : What's wrong with my Mac?

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Jorge Ferraz de Oliveira
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Joined: 16 Apr 12
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Portugal
Message 1220647 - Posted: 20 Apr 2012, 15:34:39 UTC

Hi everybody...

Something is puzzling me. I have a Dual 1.25 GHz PowerPC G4, with 1 MB L3 Cache per processor, 768 MB DDR SDRAM of memory, running under Mac OS X 10.4.1. I dowloaded yesterday the 6.12.35 version of Boinc Manager (Darwin 8.11.0) and started to run SETI@home.

I must say I was disappointed in terms of speed. Indeed, each processor, running at 100%, is taking some 45 hours (!) to process a block of data... However, when I run a CPU I get the following results:

- 797 floating point MIPS (Whetstone) per CPU
- 2437 integer MIPS (Dhrystone) per CPU

It is not an awesome speed, I agree, but I've seen worse...

I also have a more modern machine, a portable PC with a GenuineIntel Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz [Family 6 Model 30 Stepping 5](8 processors) running SETI@home. For this machine the benchmark results are:

- 1492 floating point MIPS (Whetstone) per CPU
- 7285 integer MIPS (Dhrystone) per CPU

Only the double per CPU as for the Mac, but in this case, each processor finishes a block of SETI data in approximately 2:30h (the NVIDIA GPU takes around 40 minutes).

So, anybody can tell me what's wrong with my Mac?

Thanks in advance,

Jorge

Profile Gundolf Jahn
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Germany
Message 1220659 - Posted: 20 Apr 2012, 16:11:57 UTC - in response to Message 1220647.

Did it really use those 45 hours or was that only an estimate?

Gruß,
Gundolf

Jorge Ferraz de Oliveira
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Joined: 16 Apr 12
Posts: 2
Credit: 70,705
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Portugal
Message 1220666 - Posted: 20 Apr 2012, 16:38:57 UTC - in response to Message 1220659.

Hi, Gundolf:

Thank you for your attention to my problem. Answering to your question, it is an estimate, since none of the two calculations has yet finished. I started SETI@home on my Mac yesterday, stopped overnight and restarted it again this afternoon. One of the processes is running for 10:55 hours and completed only 28.25% of the job. The other in running for 10:03 hours and solely completed 19.18% of the task. Very odd, indeed...

Regards,

Jorge

Questions and Answers : Macintosh : What's wrong with my Mac?

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