Multi core greater than 80 core

Message boards : Number crunching : Multi core greater than 80 core

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Pepo
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Message 1109304 - Posted: 24 May 2011, 8:11:11 UTC - in response to Message 1103410.  

Can we dumb this down a little and just give a one-liner on why those of use with 40 physical cores (and 80 threads) may only be seeing 20 in our account's "Computer Information" pages

Could you please give the 6.12.26 a try?
(But... sorry, I've just noticed, that the changeset [trac]changeset:23215[/trac] (which was expected to solve this issue) was not yet ported to the 6.12 line)-:

BOINC 6.12.27 is available for testing, with the code from both both changesets [trac]changeset:23214[/trac]+[trac]changeset:23215[/trac] (now joined into [trac]changeset:23576[/trac]).
Could please someone with CPUs organized into groups try it?

Peter
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Message 1109332 - Posted: 24 May 2011, 12:12:58 UTC - in response to Message 1109304.  

Can we dumb this down a little and just give a one-liner on why those of use with 40 physical cores (and 80 threads) may only be seeing 20 in our account's "Computer Information" pages

Could you please give the 6.12.26 a try?
(But... sorry, I've just noticed, that the changeset [trac]changeset:23215[/trac] (which was expected to solve this issue) was not yet ported to the 6.12 line)-:

BOINC 6.12.27 is available for testing, with the code from both both changesets [trac]changeset:23214[/trac]+[trac]changeset:23215[/trac] (now joined into [trac]changeset:23576[/trac]).
Could please someone with CPUs organized into groups try it?

Peter


And I'll add remove the <ncpus> entry before trying 6.12.27. It should now recognize all available cpu's.

If you could post the startup info from the Event Log, as its now known, about how many processors it finds.
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Message 1109662 - Posted: 25 May 2011, 16:24:02 UTC
Last modified: 25 May 2011, 16:24:39 UTC

Looks like the special fix for Windows has been added to the latest Boinc version:

Development BOINC 6.12.27 change log

6.12.27 change log

[...]

- client: Detect processor counts when the number of processors exceed 64 on Windows. ...



Anyone able to compare the system overheads between Windows with the explicit processor groups scheduling compared to the more general scheduling used by other OSes?

What percentage CPU are the scheduling overheads in any case?


Happy fast crunchin',
Martin
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Richard HaselgroveProject Donor
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Message 1109677 - Posted: 25 May 2011, 16:52:46 UTC - in response to Message 1109662.  

Warning - don't use v6.12.27 just yet - see MarkJ's 'Release Notes' thread.
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Message 1109921 - Posted: 26 May 2011, 10:46:58 UTC

In fact don't use 6.12.27 at all.

6.12.28 is now out and corrects the issue. If you'd like to test the >64 cpu changes under windows then use this version.
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Todd Madson

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Message 1109964 - Posted: 26 May 2011, 14:04:35 UTC

Absolutely crazy.

Those systems in this thread makes my corei7 2.8 with 12 gigs of ram look like a pocket calculator by comparison. Ouch!
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Message 1109974 - Posted: 26 May 2011, 14:22:12 UTC - in response to Message 1109964.  

Absolutely crazy.

Those systems in this thread makes my corei7 2.8 with 12 gigs of ram look like a pocket calculator by comparison. Ouch!


Or... Just add a GPU or two.

I'm running a few tests and comparisons at the moment. One system that was gaining about 1000 RAC on a CPU alone, jumped up towards 250 000 RAC upon adding a GPU!

That has also made the boinc manager almost unusable for displaying all tasks or for displaying a combined chart of all projects. For the chart, all I see now is an exponentially increasing line for the GPU WUs and nearly flat lines down in the noise for all other projects that are CPU-only.

Can the boinc manager chart display have the option to rescale the vertical axis to be logarithmic?!


Happy fast crunchin',
Martin

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Message boards : Number crunching : Multi core greater than 80 core


 
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