20210217, 23:02  #12 
∂^{2}ω=0
Sep 2002
República de California
2D8E_{16} Posts 
@Lorenzo:
Thanks for all the timings, that is very useful. I will add a note recommending 'cpu 0:7' for M1 users to the README. Might you have a wallplug wattmeter you can use to compare (underload  idle) wattages for those 2 systems, for whatever FFT lengths they are using to run their current GIMPS assignments? I'd be curious to get some idea regarding relative performanceperwatt. In any event, happy crunching! 
20210218, 09:36  #13  
Aug 2010
Republic of Belarus
10110010_{2} Posts 
Quote:
Sorry, but I don't have the wallplug wattmeter. 

20210218, 14:32  #14 
Jan 2008
France
2×5^{2}×11 Posts 

20210218, 14:46  #15 
Aug 2010
Republic of Belarus
2·89 Posts 

20210218, 21:08  #16 
∂^{2}ω=0
Sep 2002
República de California
2·7^{3}·17 Posts 
Some pics via Amazon.com here. The pic of the rear side shows an exhaust vent similar to those on my Intel NUCs  Lorenzo, are there intake vents on the bottom?
Had a closer look at some of your cpu 0:7 timings ... the only obvious anomaly is at the very end, 26624K FFT, the timing for that is anomalously large. This is mainly for downtheroad as this FFT is way beyond the GIMPS wavefront, but looking at the pattern of besttiming FFT radices for the rows above it, this machine seems to really like larger leading FFT radices (call the leftmost radix r0) and combos of the form r0,16,32,32 and r0,32,32,32. At this 26M FFT length, there is no such available combo because I did not (yet) implement a radix416 FFTpass routine, thus instead of 416,32,32,32 the best we can do is 208,16,16,16,16, which means an extra pass through the data each iteration. If you wold be so kind, could you pause any running jobs (I believe 'kill STOP [pid]' works on MacOS same as Linux, then 'kill CONT [pid]' to resume, and either 'pidof' or 'top' will give you the process ID), and rerun just the 26MFFT timing? Here is how: ./Mlucas iters 1000 cpu 0:7 fftlen 26624 >& test.log After that completes, paste the new lastline that got appended to mlucas.cfg as a result, and please attach the test.log . Thanks. Last fiddled with by ewmayer on 20210218 at 21:09 
20210218, 22:12  #17  
Aug 2010
Republic of Belarus
2·89 Posts 
Quote:
So I just tried to make redoing on i8100 (OS Oracle Linux 7) and I see the same: big jump from ~69 to ~141 msec exactly for 26624. So I think it's not a platform specific issue. Code:
18432 msec/iter = 53.16 ROE[avg,max] = [0.236424995, 0.281250000] radices = 288 32 32 32 0 0 0 0 0 0 20480 msec/iter = 62.92 ROE[avg,max] = [0.237479031, 0.312500000] radices = 320 32 32 32 0 0 0 0 0 0 22528 msec/iter = 66.03 ROE[avg,max] = [0.228240432, 0.312500000] radices = 352 32 32 32 0 0 0 0 0 0 24576 msec/iter = 69.49 ROE[avg,max] = [0.261424145, 0.343750000] radices = 768 16 32 32 0 0 0 0 0 0 26624 msec/iter = 144.86 ROE[avg,max] = [0.272725339, 0.343750000] radices = 52 16 16 32 32 0 0 0 0 0 26624 msec/iter = 141.33 ROE[avg,max] = [0.272368315, 0.375000000] radices = 52 16 16 32 32 0 0 0 0 0 24576 msec/iter = 68.38 ROE[avg,max] = [0.261777142, 0.359375000] radices = 768 16 32 32 0 0 0 0 0 0 26624 msec/iter = 141.06 ROE[avg,max] = [0.272368315, 0.375000000] radices = 52 16 16 32 32 0 0 0 0 0 

20210219, 07:45  #18 
Aug 2010
Republic of Belarus
2×89 Posts 
Full test for large fft on i38100:
Code:
8192 msec/iter = 19.61 ROE[avg,max] = [0.272732764, 0.375000000] radices = 256 32 32 16 0 0 0 0 0 0 9216 msec/iter = 23.07 ROE[avg,max] = [0.239072536, 0.312500000] radices = 288 16 32 32 0 0 0 0 0 0 10240 msec/iter = 27.33 ROE[avg,max] = [0.271287049, 0.375000000] radices = 320 32 32 16 0 0 0 0 0 0 11264 msec/iter = 28.73 ROE[avg,max] = [0.271818621, 0.375000000] radices = 352 32 32 16 0 0 0 0 0 0 12288 msec/iter = 32.18 ROE[avg,max] = [0.259570478, 0.312500000] radices = 768 16 16 32 0 0 0 0 0 0 13312 msec/iter = 36.87 ROE[avg,max] = [0.254703482, 0.312500000] radices = 208 32 32 32 0 0 0 0 0 0 14336 msec/iter = 39.92 ROE[avg,max] = [0.234003331, 0.296875000] radices = 224 32 32 32 0 0 0 0 0 0 15360 msec/iter = 42.65 ROE[avg,max] = [0.245504855, 0.312500000] radices = 960 16 16 32 0 0 0 0 0 0 16384 msec/iter = 44.85 ROE[avg,max] = [0.272600878, 0.375000000] radices = 256 32 32 32 0 0 0 0 0 0 18432 msec/iter = 52.67 ROE[avg,max] = [0.236424995, 0.281250000] radices = 288 32 32 32 0 0 0 0 0 0 20480 msec/iter = 61.48 ROE[avg,max] = [0.237479031, 0.312500000] radices = 320 32 32 32 0 0 0 0 0 0 22528 msec/iter = 65.70 ROE[avg,max] = [0.228240432, 0.312500000] radices = 352 32 32 32 0 0 0 0 0 0 24576 msec/iter = 68.40 ROE[avg,max] = [0.261424145, 0.343750000] radices = 768 16 32 32 0 0 0 0 0 0 26624 msec/iter = 141.14 ROE[avg,max] = [0.272725339, 0.343750000] radices = 52 16 16 32 32 0 0 0 0 0 28672 msec/iter = 106.92 ROE[avg,max] = [0.252042892, 0.312500000] radices = 224 16 16 16 16 0 0 0 0 0 30720 msec/iter = 114.56 ROE[avg,max] = [0.288327813, 0.375000000] radices = 240 16 16 16 16 0 0 0 0 0 32768 msec/iter = 101.20 ROE[avg,max] = [0.238132941, 0.312500000] radices = 1024 16 32 32 0 0 0 0 0 0 36864 msec/iter = 137.73 ROE[avg,max] = [0.265349020, 0.312500000] radices = 288 16 16 16 16 0 0 0 0 0 40960 msec/iter = 161.66 ROE[avg,max] = [0.251543120, 0.312500000] radices = 320 16 16 16 16 0 0 0 0 0 45056 msec/iter = 170.85 ROE[avg,max] = [0.244248223, 0.312500000] radices = 352 16 16 16 16 0 0 0 0 0 49152 msec/iter = 153.04 ROE[avg,max] = [0.255821747, 0.343750000] radices = 768 32 32 32 0 0 0 0 0 0 53248 msec/iter = 293.04 ROE[avg,max] = [0.262757669, 0.312500000] radices = 52 16 32 32 32 0 0 0 0 0 57344 msec/iter = 270.81 ROE[avg,max] = [0.265370288, 0.375000000] radices = 224 16 16 16 32 0 0 0 0 0 61440 msec/iter = 204.05 ROE[avg,max] = [0.246525841, 0.343750000] radices = 960 32 32 32 0 0 0 0 0 0 
20210219, 09:20  #19 
Romulan Interpreter
"name field"
Jun 2011
Thailand
3^{4}·11^{2} Posts 
Whaaaaattttt?
You must buy one, try Aliexpress, here, you can even smartmeasure some parameters of your "wife" with it! (whatever that means ) (photo for posterity, in case they change it; to be clear, this is a joke, I do not promote nor endorse that product, but "one click operation for wife" I would buy any time!). Last fiddled with by LaurV on 20210219 at 09:22 
20210219, 19:53  #20 
∂^{2}ω=0
Sep 2002
República de California
2·7^{3}·17 Posts 
Thanks  that is very helpful as far as future roadmapping goes  so for selected of the FFT lengths:
o 26M: r0 = 208 needs to be made more accurate (rejected in your test.log due to excess ROE), also need r0 = 416; o 28,30M: Need r0 = 448,480; o 36,40,44,52,56M: Need r0 = 576,640,704,832,896. 
20210510, 13:12  #21 
"Tony Gott"
Aug 2002
Yell, Shetland, UK
101001100_{2} Posts 
Apple M1 on iMac
My new iMac will be arriving shortly, and I hope to compile and run MLucas v19.1 on it.
However where do I find the simple version on how to compile on ARM cpu? 
20210510, 14:03  #22 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
37·271 Posts 

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