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21) Message boards : Problems and Help : Another Question about multi-threading (Message 116732)
Posted 1058 days ago by AeneasProject donor
Hi,

I have a host 909979 which has 2 sockets with four cores. Currently im running it with hyper threading off. ie im getting 8 logical processors crunching rather than 16.

I have an app_config.xml that looks like:

<app_config>

<app_version>
<app_name>llr321</app_name>
<cmdline>-t 8</cmdline>
<avg_ncpus>1</avg_ncpus>
</app_version>

</app_config>

The machine has 64 gb of ram of 2133mhz RAM arranged in two banks of 4 * 8gb.

1) Should I be turning hyper threading on?

2) Is there a point where multi-threading becomes less efficient and for example maybe I should be doing two tasks at once with 4 processors?

Any help would be gratefully received.



22) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116340)
Posted 1069 days ago by AeneasProject donor
Update - thanks AXN its now working as expected.

One SR5 task at a time running on multiple processors.
23) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116244)
Posted 1071 days ago by AeneasProject donor
Thanks Axn. Im using your config and will see what happens once the remaining tasks have processed.

But the processor % is set at 12.5 and the gpu tasks are still processing as well which is progress.
24) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116242)
Posted 1071 days ago by AeneasProject donor
And now i've randomly been sent 6 tasks again. Oh well.
25) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116238)
Posted 1071 days ago by AeneasProject donor
Thanks to everyone that's replied.

Its now working. I haven't changed anything but i'm only getting one task at a time now.
26) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116230)
Posted 1071 days ago by AeneasProject donor
I don't have an app_config for the gpu tasks. I wasn't aware that I needed to do that.
27) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116220)
Posted 1072 days ago by AeneasProject donor
Update. Still not working correctly, getting 6 tasks each time.

Resource share is 100 and im not running any other project.

If I set the core usage to anything less than 75% then the GPU tasks stop running.

75% being 6 of the 8 processors.
28) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116184)
Posted 1072 days ago by AeneasProject donor
Actually now that I engage my brain and check properly the resource share is 100.

At any rate we shall see what happens in 3 hours when the remaining three tasks finish of the latest 6.
29) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116180)
Posted 1072 days ago by AeneasProject donor
The problem with reducing it to 12.5% is that my gpu tasks then stop running.
30) Message boards : Problems and Help : multi threading always getting multiple tasks (Message 116179)
Posted 1072 days ago by AeneasProject donor
Resources shares is 0. I hadn't realised that I needed to reduce the cores though. I'll set what changing to 12.5 does.


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