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ProfileTex1954

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Message 71040 - Posted: 30 Jul 2021, 18:08:41 UTC

Howdy!

Have a couple questions.... especially where a Ryzen 9 5950X is concerned...


1) Why are N-Body tasks limited to 16 CPUs?

2) Why can't we set how many CPUs N-Body uses?

8-)
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Jim1348

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Message 71041 - Posted: 30 Jul 2021, 20:50:15 UTC - in response to Message 71040.  

Only the project can tell you why the limit. But you can run on any number of virtual cores (threads) up to that limit using an "app_config.xml" file.
This is for running on 12 cores, with one work unit per core; change as desired.

<app_config>
<app>
<name>milkyway_nbody</name>
<max_concurrent>12</max_concurrent>
</app>

<app_version>
<app_name>milkyway_nbody</app_name>
<plan_class>mt</plan_class>
<avg_ncpus>1</avg_ncpus>
<cmdline>--nthreads 1</cmdline>
</app_version>
</app_config>


You create it in a text processor (Notepad), use the "save as" function to save it as an ".xml" file, and place it in the project data folder.
Then restart BOINC or read in the file to activate it.
I usually just reboot. It works on Windows or Linux.
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ProfileTex1954

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Message 71042 - Posted: 31 Jul 2021, 4:38:37 UTC - in response to Message 71041.  

Worked well for me with minor mod!

THANKS!

8-)
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ProfileBill F
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Message 71043 - Posted: 31 Jul 2021, 16:34:12 UTC

Long Runner aborted after 4 days 10 hours when I finally spotted it.

de_nbody_06_16_2021_v176_40k__data__7_1626375792_418770

Thanks
Bill F
In October of 1969 I took an oath to support and defend the Constitution of the United States against all enemies, foreign and domestic;
There was no expiration date.


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Stick

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Message 71070 - Posted: 27 Aug 2021, 13:39:41 UTC - in response to Message 71043.  

Sounds like you had the problem reported here. Next time before aborting try restarting BOINC.
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Message boards : Number crunching : N-Body Simulation MT

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