Memory used ineffectively [resolved]

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rilian
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Memory used ineffectively [resolved]

#1 Ungelesener Beitrag von rilian » 05.04.2010 13:07

on 1.5GB 667Mhz RAM/ 2.1Ghz CPU (core2duo) this WU spent 9 hours just moving 0s and 1s around in memory instead of doing calculations.

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At the same time another core could crunch several less memory-consuming WUs ...
Zuletzt geändert von rilian am 05.04.2010 23:58, insgesamt 1-mal geändert.
I crunch for Ukraine

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Patrick Keller
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Re: Memory used ineffectively

#2 Ungelesener Beitrag von Patrick Keller » 05.04.2010 13:59

Moving 0s and 1s around in memory is exactly what I call "doing calculations" :)

Could you be a bit more precise on what you think went wrong?

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rilian
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Re: Memory used ineffectively

#3 Ungelesener Beitrag von rilian » 05.04.2010 22:53

Patrick, it would do calculations if it moved 0s and 1s in CPU :)

Machine is dedicated cruncher 24/7. On screenshot you can see that instead of doing calculations, it did not do anything (from CPU point of view) for 9 hours. And at the same time on another core, it crunched less-memory-expensive WUs with much less difference in runtime/cputime.

PS: at this moment WU is still crunching,
cputime = 10:21
runtime = 19:17
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Re: Memory used ineffectively

#4 Ungelesener Beitrag von Ananas » 05.04.2010 23:05

Someone already posted a possible cause for this somewhere else : Rotating the applications through the cores

Try to glue the application to only one core and it might work better.
vi BOINC/checkin_notes
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rilian
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Re: Memory used ineffectively

#5 Ungelesener Beitrag von rilian » 05.04.2010 23:21

thanks! you remind me about Affinity Changer app (that was, by the way, written by nik4eva from team Ukraine)
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Re: Memory used ineffectively [resolved]

#6 Ungelesener Beitrag von nico » 06.04.2010 08:54

Another cause may be swapping.
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