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1)
Message boards :
Number crunching :
cpu usage up from .05 to .9+ on ati
(Message 54034)
Posted 403 days ago by Vortac Similar thing here: after updating to BOINC 7.0.25, CPU usage for MilkyWay jumped from 0.05 to 0.972. Running 2 OpenCL MilkyWay tasks on 2 HD5870 ties up one (of 12) logical core on my i7-990x CPU. That core is mostly idle, the only activity observed through Task Manager is when new MW workunit is loaded for processing. Other CPU cores are running Einstein@home 24/7. MW output has slightly increased since runtimes are now 2-3 seconds shorter - it seems that one free logical core is enough to speed up two MW OpenCL tasks (compared to my previous BOINC 6.12.34 configuration when all 12 cores were running Einstein@home simultaneously with two MW OpenCL tasks on my HD5870s). With Collatz, things are same as before - CPU usage is still 0.01, all 12 cores are free for Einstein@home. |
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2)
Message boards :
Number crunching :
Validate Error
(Message 52799)
Posted 475 days ago by Vortac I am now seriously considering a purchase of 2x7970. What are the run times and GPU utilization with one MW 0.96 beta task per 7970 GPU? |
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3)
Message boards :
Number crunching :
79XX Dont Run
(Message 52709)
Posted 482 days ago by Vortac any particular reason you're crunching with the cards in X-fire? seeing as how neither X-fire nor SLI scales perfectly, 2 AMD/nVidia GPUs in X-fire/SLI will never produce twice the performance of one of those GPUs. 2 AMD cards (or nVidia cards) not in X-fire (or SLI) on the other hand will have twice the compute power. i'm assuming you game part of the time and don't want to hassle with regularly enabling and disabling X-fire, or have some other good reason for running those GPUs in X-fire even though its generally counterproductive to GPGPU computing? I've got two HD5870 in Crossfire and I disabled it after reading this post. Run times are now only about 1 second shorter (from 62 to 61 secs in average). |