Linear algebra with large vectors - Page 2

ATH · 2018-02-05, 22:54

These large vectors are only a performance improvement for multithreading MPI=1 right?

jasonp · 2018-02-06, 00:34

They apply with or without MPI; regular mulithreaded runs can use large vectors too.

pinhodecarlos · 2018-02-10, 20:49

Is your 15% speed up on LA phase? I’ve tested Tom’s example on a GNFS130 and I only had a speed up on the filtering stage of 40%. Left the LA stabilise at 10%.

jasonp · 2018-02-11, 03:01

Yes, that was the speedup I get for a SNFS C160 LA job on a Sandy Bridge laptop. I also see it for smaller problems.

frmky · 2018-02-12, 23:40

I haven't had time to work on this in a while, but I hope to get back to it soon. There's still a problem with the MPI version. The dependencies file created isn't valid, so sqrt doesn't run. There were changes here for the CUDA version to prevent having the full vector on the first GPU, and there's breakage somewhere.

2018-02-10, 20:49	#14
pinhodecarlos "Carlos Pinho" Oct 2011 Milton Keynes, UK 11523₈ Posts	Is your 15% speed up on LA phase? I’ve tested Tom’s example on a GNFS130 and I only had a speed up on the filtering stage of 40%. Left the LA stabilise at 10%. Last fiddled with by pinhodecarlos on 2018-02-10 at 20:50

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2018-02-05, 22:54	#12
ATH Einyen Dec 2003 Denmark 6127₈ Posts	These large vectors are only a performance improvement for multithreading MPI=1 right?

2018-02-06, 00:34	#13
jasonp Tribal Bullet Oct 2004 3,541 Posts	They apply with or without MPI; regular mulithreaded runs can use large vectors too.

2018-02-11, 03:01	#15
jasonp Tribal Bullet Oct 2004 110111010101₂ Posts	Yes, that was the speedup I get for a SNFS C160 LA job on a Sandy Bridge laptop. I also see it for smaller problems.

2018-02-12, 23:40	#16
frmky Jul 2003 So Cal 4072₈ Posts	I haven't had time to work on this in a while, but I hope to get back to it soon. There's still a problem with the MPI version. The dependencies file created isn't valid, so sqrt doesn't run. There were changes here for the CUDA version to prevent having the full vector on the first GPU, and there's breakage somewhere.