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ProfileultraZ
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Message 67957 - Posted: 21 Dec 2018, 0:53:13 UTC

I am running a 1700xt with 16 Gig PC=3300 with 2 Vega Frontier 16g. I can't run N-Body with out it disabling my GPU's. I will post my XML file in case i miseed simthing please look below and post if we can do this,

Hope to get some help with my problem, thanks


pp_config>
<app>
<name>milkyway</name>
<gpu_versions>
<gpu_usage>0.25</gpu_usage>
<cpu_usage>0.25</cpu_usage>
</gpu_versions>
</app>
<app_config>
<app>
<name>milkyway_nbody</name>
<max_concurrent>1</max_concurrent>
<app_version>
<app_name>milkyway_nbody</app_name>
<plan_class>mt</plan_class>
<avg_ncpus>12</avg_ncpus>
</app_version>
</app>
</app_config>
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ProfileultraZ
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Message 67958 - Posted: 21 Dec 2018, 0:55:19 UTC - in response to Message 67957.  

sorry missed a bracket in copy past.
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Message 67959 - Posted: 21 Dec 2018, 9:17:15 UTC

First, check your startup log. There should be a message saying your app_config is read, or a message saying there is a problem. It does look like there's a syntax problem. <app_config> is in there twice.


<app_config>

<app>
<name>milkyway</name>
<gpu_versions>
<gpu_usage>0.25</gpu_usage>
<cpu_usage>0.25</cpu_usage>
</gpu_versions>
</app>

<app>
<name>milkyway_nbody</name>
<max_concurrent>1</max_concurrent>
<app_version>
<app_name>milkyway_nbody</app_name>
<plan_class>mt</plan_class>
<avg_ncpus>12</avg_ncpus>
</app_version>
</app>

</app_config>

I don't run nbody but see if that works. You might need to use the cmdline parameter to control the number of nbody threads instead of ncpus.

https://boinc.berkeley.edu/wiki/Client_configuration
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Message 67968 - Posted: 27 Dec 2018, 22:50:28 UTC - in response to Message 67959.  

Thanks, will look into the CPU commands in the link and will give it a try.
The two clients, one for GPU and CPU sounds less of a pain if i can figure it out, and if not I'll be back.
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ProfileKeith Myers
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Message 67969 - Posted: 28 Dec 2018, 2:16:24 UTC

On the face of it, seems you don't have enough cores to satisfy both the gpus and the cpu.

Your mt application wants to use 12 cores out your total of 16 available for your cpu.

Then you want to run 4 gpu tasks per card and you have two cards. So a total of 8 gpu tasks running. Even with only .25 cpu cores to support each task, that adds another 2 cores to your 12 mt cores leaving only 2 cores to support the desktop and background tasks.

And the <cpu_usage>0.25</cpu_usage> is only a scheduling recommendation. The gpu tasks will use as much of a cpu core as the science application needs. It can be a lot more than just a quarter of a core. If you have BoincTasks running it will report that actual amount of cpu usage a gpu task required to run it.

I run my Einstein gpu tasks with a full cpu to support it so I don't have any typical values about what a task actually needs minimally to support it. Maybe others can jump in with typical values.
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ProfileKeith Myers
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Message 67970 - Posted: 28 Dec 2018, 2:18:33 UTC

I would just drop your mt cpu core usage down to eight and see if both task types run.
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