20200505, 04:16  #2146 
Sep 2002
Database er0rr
111001011011_{2} Posts 
different fft sizes
I have been running two instances at 5632K. Now I have a new set of assignments at 6144K. Running two different FFT sizes has two effects.: The smaller runs faster and the larger runs much slower. It is more efficient to run one instance. Will this imbalance be redressed when I have equal 6144K assignments?

20200505, 04:41  #2147  
P90 years forever!
Aug 2002
Yeehaw, FL
2^{2}·1,873 Posts 
Quote:


20200505, 06:37  #2148  
Sep 2002
Database er0rr
3·5^{2}·7^{2} Posts 
Quote:
Code:
./gpuowl ./gpuowl: /usr/lib/x86_64linuxgnu/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by ./gpuowl) 

20200505, 07:36  #2149 
Sep 2002
Database er0rr
3·5^{2}·7^{2} Posts 
I have two compilers. I think I installed gcc 9 manually for the source and 8 is native. Anyway for my purposes I hard wired g++8 into the make file and all is hunky dory now.
Last fiddled with by paulunderwood on 20200505 at 13:57 
20200505, 18:50  #2150 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
3·29·59 Posts 
For what it's worth, this matching LL DC with shift 0 was performed in gpuowl v6.11264 on the RX480 in the same system as was previously having frequent GEC errors on rx550s.
https://www.mersenne.org/report_expo...5487503&full=1 
20200505, 20:24  #2151  
∂^{2}ω=0
Sep 2002
República de California
3×3,877 Posts 
Quote:
1. Both @5632K; 2. One each @5632K and @6144K; 3. Both @6144K. Presumably you already know the timing for the first 2 ... you could temporarily move one of your queuedup 6144K assignments to top of the worktodo file for the current 5632K run to get both @6144K. If the slowdown for 2 compared to 1 and 3 really is as bad as you describe, I wonder if it's something to do with contextswitching on the GPU between tasks that have different memory mappings: 2 jobs at same FFT length have different run data and e.g. DWT weights but have the same memory profile and GPU resources usage. Edit: I tried the above three 2jobs scenarios on my own Radeon7, using expos ~107M to trigger the 6M FFT length. Here are the periteration timings: 1. Both @5632K: 1470 us/iter for each, total throughput 1360 iter/sec; 2. One each @5632K,@6144K: 1530,1546 us/iter resp., total throughput 1300 iter/sec; 3. Both @6144K: 1615 us/iter for each, total throughput 1238 iter/sec. So no anomalous slowdowns for me at any of these combos, and the periteration timings hew very closely to what one would expect based on an n*log(n) perautosquaring scaling. Last fiddled with by ewmayer on 20200505 at 21:33 

20200505, 21:59  #2152  
Sep 2002
Database er0rr
3×5^{2}×7^{2} Posts 
Quote:
2. One each @5632K and @6144K > the latter was ~2300us/it (very slow); the former 1125us/it At the moment (with latest commit) it is running ~1200us/it (103.9M) and ~1800us/it (104.9M). They were running at the average earlier until I restarted them. It is my last 103.9M exponent. Last fiddled with by paulunderwood on 20200505 at 22:13 

20200507, 05:49  #2153 
Sep 2002
Database er0rr
3675_{10} Posts 
Was ~1200us/it (103.9M) and ~1800us/it (104.9M).
Now 1440us/it each  both at 104.9M. 
20200507, 16:56  #2154 
"Eric"
Jan 2018
USA
2^{2}×53 Posts 
PM1 Result not understood
It seems that for factored PM1 results out of GPUOWL, primenet won't be able to understand it.
Code:
{"status":"F", "exponent":"98141611", "worktype":"PM1", "B1":"750000", "B2":"15000000", "fftlength":"5767168", "factors":"["****"]", "program":{"name":"gpuowl", "version":"v6.11258gb92cdfd"}, "computer":"TITAN V0", "aid":"******", "timestamp":"20200506 07:29:29 UTC"} 
20200507, 18:23  #2155 
Sep 2006
Brussels, Belgium
2×5×167 Posts 

20200507, 18:35  #2156  
Sep 2002
Database er0rr
3×5^{2}×7^{2} Posts 
Quote:
nvm: I found this on how to do it Gnome without having to remember and use unicodes. Thanks for prompting me! Last fiddled with by paulunderwood on 20200507 at 18:47 

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