Posts by Tobias Becke [Gridcoin]

1) Message boards : Number crunching : CPU usage jumps // 16t WUs use 64cores but only 2% CPU load (Message 1036)
Posted 21 Jul 2017 by Tobias Becke [Gridcoin]
Post:
Thanks for the input.

I experienced if a second 64 thread task starts there are problems. It opens ecm processes but the processes seem to be shut down a few seconds after being opened. I suppose it can not find enough free cores to run it? If I got you right, the process will finish eventually, but will take more time with gnfs instead of ecm?

Kind Regards
2) Message boards : Number crunching : CPU usage jumps // 16t WUs use 64cores but only 2% CPU load (Message 1034)
Posted 20 Jul 2017 by Tobias Becke [Gridcoin]
Post:
Hello Yafu community,

I have an 80 thread Xeon server. I wanted to use all threads on yafu so I set CPU usage and CPU time usage to 100% and yafu as only project. The result: a maximum of 64 threads is used on one single WU. The CPU usage jumps between ~10 and 90%.

To compensate this, I have set <ncpus>128</ncpus> so 2 tasks with each 64 threads started running, using more or less 100% CPU, still with small jumps. After some time, the CPU load went to about 60%. Now, one task still uses 50%+, the other is "stuck" at 2% CPU load. The time to finish is decreasing in both asks, but in one it is decreasing very slowly.

Can I somehow improve the situation? I read yoyo is prefering to run 16t tasks so I want to stick to that, but if the CPU is not maxed out I guess I crunch sub-optimal.

Kind Regards







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