20200310, 18:07  #12 
"Curtis"
Feb 2005
Riverside, CA
2^{2}·3·349 Posts 
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 N1 cores runs faster than N cores, for what I presume are similar reasons. 
20200310, 18:17  #13 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
3·1,523 Posts 
HT helps a lot on LA, at least for me.

20200312, 23:36  #14  
"Curtis"
Feb 2005
Riverside, CA
2^{2}·3·349 Posts 
Quote:
VBITS=128 on otherwise idle machine. ETA after 1% of job: 6threaded 14hr 34 min 12threads 8 hr 26 min 18threads 9 hr 15 min 24threads 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. 

20200427, 12:16  #15  
"Mike"
Aug 2002
2^{2}×1,879 Posts 
Quote:
Note that we only count the LA phase in our calculations. 

20200427, 22:12  #16  
"Mike"
Aug 2002
2^{2}×1,879 Posts 
Quote:
12 = 8h04m50s 20 = 8h32m31s 24 = 7h59m33s 

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