Memory used ineffectively [resolved]

[rilian]

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.



At the same time another core could crunch several less memory-consuming WUs ...

[Patrick Keller]

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?

[rilian]

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

[Ananas]

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.

[rilian]

thanks! you remind me about Affinity Changer app (that was, by the way, written by nik4eva from team Ukraine)

[nico]

Another cause may be swapping.