Messages in this thread |  | | Date | Wed, 11 Aug 2004 12:24:25 +0200 | From | "Prakash K. Cheemplavam" <> | Subject | Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others) |
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Con Kolivas wrote: | I tried this on the latest staircase patch (7.I) and am not getting any | output from your script when tested up to 60 threads on my hardware. Can | you try this version of staircase please? | | There are 7.I patches against 2.6.8-rc4 and 2.6.8-rc4-mm1 | | http://ck.kolivas.org/patches/2.6/2.6.8/
Hi,
I just updated to 2.6.8-rc4-ck2 and tried the two options interactive and compute. Is the compute stuff functional? I tried setting it to 1 within X and after that X wasn't usable anymore (meaning it looked like locked up, frozen/gone mouse cursor even). I managed to switch back to console and set it to 0 and all was OK again.
The interactive to 0 setting helped me with runnign locally multiple processes using mpi. Nevertheless (only with interactive 1 regression to vanilla scheduler, else same) can't this be enhanced?
Details: I am working on a load balancing class using mpi. For testing purpises I am running multiple processes on my machine. So for a given problem I can say, it needs x time to solve. Using more processes opn a single machine, this time (except communication and balancing overhead) shouldn't be much larger. Unfortunately this happens. Eg. a given probelm using two processes needs about 20 seconds to finish. But using 8 it already needs 47s (55s with interactiv set to 1). No, my balancing framework is quite good. On a real (small, even larger till 128 nodes tested) cluster overhead is just as low as 3% to 5%, ie. it scales quite linearly.
Any idea how to tweak the staircase to get near the 20 seconds with more processes? Or is this rather a problem of mpich used locally?
If you like I can send you my code to test (beware it is not that small).
Cheers,
Prakash -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
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