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Old 2020-03-10, 18:07   #12
VBCurtis
 
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"Curtis"
Feb 2005
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Xyzzy-
While unlikely, it is possible that 20 or 24 threads yields a bit of improvement. Hyperthreads don't always help on matrix solving, but since this is a benchmark thread it might be nice to demonstrate that.

I suggest 20 as alternative because using every possible HT might be impacted by any background process, but that effect should be reduced if we leave a few HTs 'open'. I've found situations where using N-1 cores runs faster than N cores, for what I presume are similar reasons.
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Old 2020-03-10, 18:17   #13
pinhodecarlos
 
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"Carlos Pinho"
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HT helps a lot on LA, at least for me.
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Old 2020-03-12, 23:36   #14
VBCurtis
 
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Quote:
Originally Posted by VBCurtis View Post
-nc1 was run with target-density 134. After remdups and adding freerels in, msieve states 99.3M unique relations. Matrix came out 4.57M dimensions. TD=140 did not complete filtering.
Machine: Xeon 2680v3 Haswell generation 12x2.5ghz, 48GB memory on 4 channels DDR4 (4x4GB+4x8GB).

VBITS=128 on otherwise idle machine. ETA after 1% of job:
6-threaded 14hr 34 min
12-threads 8 hr 26 min
18-threads 9 hr 15 min
24-threads 8 hr 27 min
These times look rather slow; I just installed the extra 32GB memory today, so perhaps filling all 8 slots slows memory access a bunch. Some time I'll remove the original 16GB and see if 4 sticks is faster than 8.
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