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Posts by bapu

1) Message boards : Number crunching : OS dependence - Linux version not fully optimized? (Message 44883)
Posted 10 Dec 2010 by bapu
I just compared performance of the current CUDA applications under Linux and Windows as I was a bit disappointed by the Linux computation times.

I have a system with GTX 295 cards that is booted either from a Windows or a Linux (Suse 11.2) disk. CUDA was installed using the latest Nvidia files under both systems, Boinc was freshly installed (as where the project files).

Under Linux I observe computation times around 25 minutes, under Windows about half of that ...

Could that point to the possibility of some serious improvement in the Linux code/app?
2) Message boards : Number crunching : computation error after finishing (Message 42550)
Posted 4 Oct 2010 by bapu
I have further raised those limits - and the others on that pref tab to

20GB max
leave 0.1GB
99.9% max
75% swap

90% memory

As mentioned earlier, I have several GB (disk space as well as memory) left as seen by df and top. Swap space is not used.

Nontheless I get these messages of a couple MB not being available ...

I have similar problems with other GPU-based projects, too (CPU tasks work fine). Might there be some more basic problem that I encounter?

I would like to put these GPUs to use, but for now all I achieve is hot air - literally.
3) Message boards : Number crunching : computation error after finishing (Message 42493)
Posted 1 Oct 2010 by bapu
Thanks for these hints, Brian and magyarficko.

I do indeed get messages saying, e.g.,

Aborting task ... exceeded disk limit: 19.05MB > 14.31MB

which I must have overlooked so far only noting the file absent messages at the end.

However, my preferences are set way above that limit - the disk tab shows 1.4 GB "free, available to BOINC", there are several GB unused system memory, so I don't see, how those 19MB should/could cause a problem ...

I just raised those limits even higher - same behaviour :(

And maybe more directly one more question: where is this 14.31MB limit set?

4) Message boards : Number crunching : computation error after finishing (Message 42470)
Posted 30 Sep 2010 by bapu
I have done a couple of GPU comptations on a GTX295 which ran nicely, only to find out that they were logged as computation error afterwards.

I do seem to have the output file absent error that I found mentioned in several threads, but have yet to find a solution that works to get the results accepted.

resetting or detaching/reattaching did not affect the behaviour ...

Any suggestions would be appreciated.

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