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Message boards : Project Staging Area : Looking at Wieferich again

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mackerelProject donor
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Discovered 2 mega primesEliminated 1 conjecture "k"Found 3 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 5 primes in the 2019 Tour de PrimesFound 6 primes in the 2020 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (8,774,878)Cullen LLR Turquoise: Earned 5,000,000 credits (5,149,818)ESP LLR Turquoise: Earned 5,000,000 credits (6,454,573)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,122,074)PPS LLR Emerald: Earned 50,000,000 credits (74,819,953)PSP LLR Jade: Earned 10,000,000 credits (15,223,714)SoB LLR Jade: Earned 10,000,000 credits (17,319,914)SR5 LLR Sapphire: Earned 20,000,000 credits (23,996,561)SGS LLR Turquoise: Earned 5,000,000 credits (7,342,780)TPS LLR (retired) Bronze: Earned 10,000 credits (34,130)TRP LLR Jade: Earned 10,000,000 credits (18,602,519)Woodall LLR Turquoise: Earned 5,000,000 credits (5,715,464)321 Sieve Sapphire: Earned 20,000,000 credits (20,236,219)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,383,853)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,626,419)PPS Sieve Emerald: Earned 50,000,000 credits (76,969,144)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,293,882)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,012,757)AP 26/27 Sapphire: Earned 20,000,000 credits (21,918,894)GFN Emerald: Earned 50,000,000 credits (71,887,807)PSA Ruby: Earned 2,000,000 credits (2,939,755)
Message 68983 - Posted: 7 Sep 2013 | 9:06:57 UTC

I was surprised to find a few e-mails this morning saying I found a few near Wieferich primes. The biggest surprise being I can't remember when was the last time I looked for these! After a bit of digging, it turns out these were found in January 2012!

Just for fun I thought I might run it a bit again. I downloaded the latest client to make sure I'm current, and debated what to use exactly. I thought I'd do a quick test to see how the client relative performance compared with each other.

First the CPU:

C:\prpclient-5.2.7-windows\programs>wwww -p 8835311e9 -P 8835 312e9 -t Wieferich -s 1000 -v wwww v1.3, a program to search for Wieferich and Wall-Sun-Sun primes. Searching for Wieferich primes between 8835311000000000 and 8835312000000000. The largest prime in the sieve is 93996997 (using 5434938 primes) using approximately 28533 KB of memory. Searched to 8835311554769701 (55.48 done) 8835311569955267 is a special instance (-1 -749 p) Searched to 8835312012186660 (100.00 done) The search completed in 21.37 seconds (1274314.52 tests per second) Spent 3.41 seconds sieving and 17.86 seconds testing Tested 27234650 values (2.72 pct) of the range Primes tested 27234650. Checksum 000000007a19696f. Time 21.372000


Ok, not bad. Of course, I could run 4 instances at once since I have 4 physical cores on this computer.

Let's see what the GPU can do? The first attempt took 105 seconds. That doesn't look so good. Am I doing something stupid? Hardly any CPU time and no GPU time used, but it still finished anyway. Repeating this, I noticed there was no significant CPU or GPU activity while running, so something isn't right here. Looking at the options I played with the number of threads. Experimentally 64 seemed like a good number, and I got this:

C:\prpclient-5.2.7-windows\programs>wwwwcl -p 8835311e9 -P 88 35312e9 -T Wieferich -s 1000 -v -t 64 wwwwcl v2.2.5, a GPU program to search for Wieferich and WallSunSun primes Platform 0 is a NVIDIA Corporation NVIDIA CUDA, version OpenCL 1.1 CUDA 4.2.1 Device 0 is a NVIDIA Corporation GeForce GTX 560 Ti workGroupSize = 4096 = 16 * 32 * 8 (blocks * workGroupSizeMultiple * deviceCompu teUnits) Running with 64 threads Allocated memory (prior to sieving): 3 MB in CPU, 3 MB in GPU Sieve started: (cmdline) 8835311000000000 <= p < 8835312000000000 8835311569955267 is a special instance (-1 -749 p) Sieve complete: 8835311000000001 <= p < 8835312000000000 27234650 primes tested Clock time: 2.11 seconds at at 12931196 p/sec. Processor time: 7.49 sec. (3.54 init + 3.95 sieve). Seconds spent in CPU and GPU: 1.19 (cpu), 22.18 (gpu) Percent of time spent in CPU vs. GPU: 5.11 (cpu), 94.89 (gpu) CPU/GPU utilization: 3.56 (cores), 1.00 (devices) Percent of GPU time waiting for GPU: 14.89


I know I'm testing only a very small range, so any setup time could be significant compared to the run time. Still, the single GPU seems to be a LOT faster than if I were to use the CPU.

Since there's also what appears to be a 64 bit version, I guess I should try that too.

C:\prpclient-5.2.7-windows\programs>wwwwcl64 -p 8835311e9 -P 8835312e9 -T Wieferich -s 1000 -v -t 64 wwwwcl v2.2.5, a GPU program to search for Wieferich and WallSunSun primes Platform 0 is a NVIDIA Corporation NVIDIA CUDA, version OpenCL 1.1 CUDA 4.2.1 Device 0 is a NVIDIA Corporation GeForce GTX 560 Ti workGroupSize = 4096 = 16 * 32 * 8 (blocks * workGroupSizeMultiple * deviceCompu teUnits) Running with 64 threads Allocated memory (prior to sieving): 3 MB in CPU, 3 MB in GPU Sieve started: (cmdline) 8835311000000000 <= p < 8835312000000000 8835311569955267 is a special instance (-1 -749 p) Sieve complete: 8835311000000001 <= p < 8835312000000000 27234650 primes tested Clock time: 1.75 seconds at at 15561768 p/sec. Processor time: 3.78 sec. (1.05 init + 2.73 sieve). Seconds spent in CPU and GPU: 0.58 (cpu), 24.28 (gpu) Percent of time spent in CPU vs. GPU: 2.31 (cpu), 97.69 (gpu) CPU/GPU utilization: 2.16 (cores), 1.00 (devices) Percent of GPU time waiting for GPU: 20.12



I also have an ATI card in this PC, but even with the platform command setting it only wants to use the nvidia card. I could make it use the ATI card if I use the ini file, but that crashes.

Back to nvidia then, can I tune it even more? I tried the block setting also. I tried multiples of 2 and multiples of 10, and decided that 500 seemed to give best performance.

C:\prpclient-5.2.7-windows\programs>wwwwcl64 -p 8835311e9 -P 8835312e9 -T Wieferich -s 1000 -v -t 64 -b 500 wwwwcl v2.2.5, a GPU program to search for Wieferich and WallSunSun primes Platform 0 is a NVIDIA Corporation NVIDIA CUDA, version OpenCL 1.1 CUDA 4.2.1 Device 0 is a NVIDIA Corporation GeForce GTX 560 Ti workGroupSize = 128000 = 500 * 32 * 8 (blocks * workGroupSizeMultiple * deviceCo mputeUnits) Running with 64 threads Allocated memory (prior to sieving): 93 MB in CPU, 93 MB in GPU Sieve started: (cmdline) 8835311000000000 <= p < 8835312000000000 8835311569955267 is a special instance (-1 -749 p) Sieve complete: 8835311000000001 <= p < 8835312000000000 27234650 primes tested Clock time: 1.10 seconds at at 24757355 p/sec. Processor time: 3.45 sec. (0.92 init + 2.53 sieve). Seconds spent in CPU and GPU: 0.19 (cpu), 43.67 (gpu) Percent of time spent in CPU vs. GPU: 0.44 (cpu), 99.56 (gpu) CPU/GPU utilization: 3.13 (cores), 1.00 (devices) Percent of GPU time waiting for GPU: 60.47



Does the above sound about optimal, or are there any other tips for getting the best performance? I think I'll check the above with a bigger range before serious crunching.

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Discovered 2 mega primesEliminated 1 conjecture "k"Found 3 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 5 primes in the 2019 Tour de PrimesFound 6 primes in the 2020 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (8,774,878)Cullen LLR Turquoise: Earned 5,000,000 credits (5,149,818)ESP LLR Turquoise: Earned 5,000,000 credits (6,454,573)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,122,074)PPS LLR Emerald: Earned 50,000,000 credits (74,819,953)PSP LLR Jade: Earned 10,000,000 credits (15,223,714)SoB LLR Jade: Earned 10,000,000 credits (17,319,914)SR5 LLR Sapphire: Earned 20,000,000 credits (23,996,561)SGS LLR Turquoise: Earned 5,000,000 credits (7,342,780)TPS LLR (retired) Bronze: Earned 10,000 credits (34,130)TRP LLR Jade: Earned 10,000,000 credits (18,602,519)Woodall LLR Turquoise: Earned 5,000,000 credits (5,715,464)321 Sieve Sapphire: Earned 20,000,000 credits (20,236,219)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,383,853)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,626,419)PPS Sieve Emerald: Earned 50,000,000 credits (76,969,144)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,293,882)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,012,757)AP 26/27 Sapphire: Earned 20,000,000 credits (21,918,894)GFN Emerald: Earned 50,000,000 credits (71,887,807)PSA Ruby: Earned 2,000,000 credits (2,939,755)
Message 68984 - Posted: 7 Sep 2013 | 10:41:06 UTC - in response to Message 68983.

Done some more testing and got a better GPU configuration of -T 8 -b 3000. I really wish I knew the impact of these values if it'll help me find even more optimal settings other than guessing.

Using a search range 100x previously:

C:\prpclient-5.2.7-windows\programs>wwww -p 88353e11 -P 88354e11 -t Wieferich -s 1000 -v wwww v1.3, a program to search for Wieferich and Wall-Sun-Sun primes. Searching for Wieferich primes between 8835300000000000 and 8835400000000000. The largest prime in the sieve is 93996997 (using 5434938 primes) using approximately 28533 KB of memory. Searched to 8835311566000921 (11.57 done) 8835311569955267 is a special instance (-1 -749 p) Searched to 8835400010837400 (100.00 done) The search completed in 2201.61 seconds (1237057.51 tests per second) Spent 339.61 seconds sieving and 1851.80 seconds testing Tested 2723523131 values (2.72 pct) of the range Primes tested 2723523131. Checksum 000000007f36b3b7. Time 2201.614000


C:\prpclient-5.2.7-windows\programs>wwwwcl -p 88353e11 -P 88354e11 -T Wieferich -s 1000 -v -t 8 -b 3000 wwwwcl v2.2.5, a GPU program to search for Wieferich and WallSunSun primes Platform 0 is a NVIDIA Corporation NVIDIA CUDA, version OpenCL 1.1 CUDA 4.2.1 Device 0 is a NVIDIA Corporation GeForce GTX 560 Ti workGroupSize = 768000 = 3000 * 32 * 8 (blocks * workGroupSizeMultiple * deviceComputeUnits) Running with 8 threads Allocated memory (prior to sieving): 70 MB in CPU, 70 MB in GPU Sieve started: (cmdline) 8835300000000000 <= p < 8835400000000000 p=8835397826699999, 37.47M p/sec, 2.98 CPU cores, 97.8% done. ETA 07 Sep 11:17 8835311569955267 is a special instance (-1 -749 p) Sieve complete: 8835300000000001 <= p < 8835400000000000 2723523131 primes tested Clock time: 73.53 seconds at at 37039011 p/sec. Processor time: 220.91 sec. (3.79 init + 217.12 sieve). Seconds spent in CPU and GPU: 12.01 (cpu), 438.99 (gpu) Percent of time spent in CPU vs. GPU: 2.66 (cpu), 97.34 (gpu) CPU/GPU utilization: 3.00 (cores), 1.00 (devices) Percent of GPU time waiting for GPU: 62.13


C:\prpclient-5.2.7-windows\programs>wwwwcl64 -p 88353e11 -P 88354e11 -T Wieferich -s 1000 -v -t 8 -b 3000 wwwwcl v2.2.5, a GPU program to search for Wieferich and WallSunSun primes Platform 0 is a NVIDIA Corporation NVIDIA CUDA, version OpenCL 1.1 CUDA 4.2.1 Device 0 is a NVIDIA Corporation GeForce GTX 560 Ti workGroupSize = 768000 = 3000 * 32 * 8 (blocks * workGroupSizeMultiple * deviceComputeUnits) Running with 8 threads Allocated memory (prior to sieving): 70 MB in CPU, 70 MB in GPU Sieve started: (cmdline) 8835300000000000 <= p < 8835400000000000 p=8835398054474449, 37.16M p/sec, 2.17 CPU cores, 98.1% done. ETA 07 Sep 11:20 8835311569955267 is a special instance (-1 -749 p) Sieve complete: 8835300000000001 <= p < 8835400000000000 2723523131 primes tested Clock time: 73.79 seconds at at 36907998 p/sec. Processor time: 161.23 sec. (1.39 init + 159.84 sieve). Seconds spent in CPU and GPU: 11.34 (cpu), 487.36 (gpu) Percent of time spent in CPU vs. GPU: 2.27 (cpu), 97.73 (gpu) CPU/GPU utilization: 2.18 (cores), 1.00 (devices) Percent of GPU time waiting for GPU: 70.06


On the GPU, I'm also getting significant CPU usage, up to 50%. The 64 version seems to be consistently a tiny bit slower overall than the non-64 version (I'm in Win7-64).

Roughly speaking, the whole GPU is 30x faster than a single CPU core (i7 2600), or a bit over 7x faster than running CPU by itself (maybe more, due to the dynamic clock vs. threads on CPU).

Enough testing for now, I'll get some real work done :) But I'd still welcome any tips for further optimisation if possible.

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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (14,262,044)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,291,181)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (2,276,330)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)GFN Emerald: Earned 50,000,000 credits (74,223,873)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 68985 - Posted: 7 Sep 2013 | 10:57:10 UTC

Please check the headers on those emails -- I suspect they may have come from the test server. I seem to recall WSS sending out duplicate emails when we upgraded it to 5.2.5 a few months ago.


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Discovered 2 mega primesEliminated 1 conjecture "k"Found 3 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 5 primes in the 2019 Tour de PrimesFound 6 primes in the 2020 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (8,774,878)Cullen LLR Turquoise: Earned 5,000,000 credits (5,149,818)ESP LLR Turquoise: Earned 5,000,000 credits (6,454,573)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,122,074)PPS LLR Emerald: Earned 50,000,000 credits (74,819,953)PSP LLR Jade: Earned 10,000,000 credits (15,223,714)SoB LLR Jade: Earned 10,000,000 credits (17,319,914)SR5 LLR Sapphire: Earned 20,000,000 credits (23,996,561)SGS LLR Turquoise: Earned 5,000,000 credits (7,342,780)TPS LLR (retired) Bronze: Earned 10,000 credits (34,130)TRP LLR Jade: Earned 10,000,000 credits (18,602,519)Woodall LLR Turquoise: Earned 5,000,000 credits (5,715,464)321 Sieve Sapphire: Earned 20,000,000 credits (20,236,219)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,383,853)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,626,419)PPS Sieve Emerald: Earned 50,000,000 credits (76,969,144)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,293,882)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,012,757)AP 26/27 Sapphire: Earned 20,000,000 credits (21,918,894)GFN Emerald: Earned 50,000,000 credits (71,887,807)PSA Ruby: Earned 2,000,000 credits (2,939,755)
Message 68989 - Posted: 7 Sep 2013 | 11:46:59 UTC

I don't see anything obvious in the mail or headers to suggest it is a test.

Still, now that my attention has been drawn back here I'm putting some units through now :) With the settings I found above, I'm eating the units at around 75 seconds each. 43 units in, no special results yet. I still wish I knew how to optimally set the performance settings.

I had forgotten about the heat and noise the GPU makes, so I don't think I'll run it for that long until the weather gets much cooler.

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Discovered 7 mega primesEliminated 4 conjecture "k"sFound 2 primes in the 2018 Tour de PrimesFound 1 prime in the 2018 Tour de Primes Mountain Stage2019 Tour de Primes largest primeFound 4 primes in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de PrimesFound 1 prime in the 2019 Tour de Primes Mountain StageFound 1 prime in the 2020 Tour de Primes321 LLR Emerald: Earned 50,000,000 credits (74,738,778)Cullen LLR Emerald: Earned 50,000,000 credits (50,296,190)ESP LLR Emerald: Earned 50,000,000 credits (50,853,190)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,309,119)PPS LLR Double Bronze: Earned 100,000,000 credits (118,841,311)PSP LLR Emerald: Earned 50,000,000 credits (50,563,867)SoB LLR Double Bronze: Earned 100,000,000 credits (101,502,109)SR5 LLR Double Bronze: Earned 100,000,000 credits (101,883,529)SGS LLR Emerald: Earned 50,000,000 credits (53,154,727)TPS LLR (retired) Bronze: Earned 10,000 credits (43,033)TRP LLR Double Bronze: Earned 100,000,000 credits (100,338,924)Woodall LLR Emerald: Earned 50,000,000 credits (50,956,094)321 Sieve Double Bronze: Earned 100,000,000 credits (115,948,450)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,142,109)Generalized Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (50,504,945)PPS Sieve Double Gold: Earned 500,000,000 credits (513,057,580)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,288,222)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,149,354)AP 26/27 Double Silver: Earned 200,000,000 credits (232,724,773)GFN Double Gold: Earned 500,000,000 credits (732,767,585)PSA Double Gold: Earned 500,000,000 credits (535,232,795)
Message 68993 - Posted: 7 Sep 2013 | 14:54:46 UTC - in response to Message 68985.

Please check the headers on those emails -- I suspect they may have come from the test server. I seem to recall WSS sending out duplicate emails when we upgraded it to 5.2.5 a few months ago.


Yes, from test server.

Received: from localhost (test.primegrid.com [166.78.242.224]) by csep02.cliche.se (Postfix) with ESMTP id 5A19A185B8F;

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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (14,262,044)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,291,181)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (2,276,330)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)GFN Emerald: Earned 50,000,000 credits (74,223,873)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 68995 - Posted: 7 Sep 2013 | 16:31:51 UTC
Last modified: 7 Sep 2013 | 16:32:54 UTC

Or it could be that in 5.2.5, I may have fixed a bug in the server that was preventing email from going out. This bug may have been only in WWWW. So with the bug fixed, WSS (which was upgraded to 5.2.5 a few months ago) sent out mail that never had been sent out. Now that Wief is upgraded to 5.2.8 on the test server (from 5.2.0), it's sending out mail that wasn't sent out before.

(I don't usually touch the PRPNet software, but that was an exception.)

And, guess what? Most likely, when the test server goes live and the database is reloaded, it will likely send out those emails again. That should be the last of the ancient emails.
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Message 69017 - Posted: 7 Sep 2013 | 23:44:36 UTC - in response to Message 68995.

Or it could be that in 5.2.5, I may have fixed a bug in the server that was preventing email from going out. This bug may have been only in WWWW. So with the bug fixed, WSS (which was upgraded to 5.2.5 a few months ago) sent out mail that never had been sent out. Now that Wief is upgraded to 5.2.8 on the test server (from 5.2.0), it's sending out mail that wasn't sent out before.

(I don't usually touch the PRPNet software, but that was an exception.)

And, guess what? Most likely, when the test server goes live and the database is reloaded, it will likely send out those emails again. That should be the last of the ancient emails.


You can update the database directly to prevent it from sending e-mails for "ancient" finds.

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Credit: 266,942,191
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Found 1 prime in the 2018 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,037,982)Cullen LLR Ruby: Earned 2,000,000 credits (2,015,907)ESP LLR Ruby: Earned 2,000,000 credits (2,232,391)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,088,705)PPS LLR Ruby: Earned 2,000,000 credits (2,962,062)PSP LLR Ruby: Earned 2,000,000 credits (2,539,644)SoB LLR Ruby: Earned 2,000,000 credits (2,122,524)SR5 LLR Ruby: Earned 2,000,000 credits (2,238,295)SGS LLR Ruby: Earned 2,000,000 credits (3,560,075)TRP LLR Ruby: Earned 2,000,000 credits (2,125,391)Woodall LLR Ruby: Earned 2,000,000 credits (2,037,732)321 Sieve Turquoise: Earned 5,000,000 credits (5,190,731)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (207,387)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,049,697)PPS Sieve Double Bronze: Earned 100,000,000 credits (100,422,123)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (3,227,972)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,021,659)AP 26/27 Sapphire: Earned 20,000,000 credits (20,651,644)GFN Emerald: Earned 50,000,000 credits (57,918,585)PSA Sapphire: Earned 20,000,000 credits (43,298,465)
Message 69020 - Posted: 8 Sep 2013 | 0:59:10 UTC - in response to Message 68984.

But I'd still welcome any tips for further optimisation if possible.

This is the testing I did to find the sweet spot with my HD7970GHz:

threads=8, blocks=256, 3 units=2:46, average=55.3 threads=7, blocks=256, 3 units=2:47, average=55.6 threads=6, blocks=256, 3 units=2:59, average=59.6 threads=8, blocks=2048, 3 units=2:40, average=53.3 threads=8, blocks=1024, 3 units=2:35, average=51.6 threads=8, blocks=512, 3 units=2:39, average=53 threads=7, blocks=2048, 3 units=2:38, average=52.6 threads=7, blocks=1024, 3 units=2:35, average=51.6 threads=7, blocks=512, 3 units=2:43, average=54.4 threads=6, blocks=2048, 3 units=2:38, average=52.6 threads=6, blocks=1024, 3 units=2:35, average=51.6 threads=6, blocks=512, 3 units=2:36, average=52


I ended up settling on blocks=1024, threads=6 and 20 WU's at a time.
For some reason I find it a few seconds quicker with a web browser open.
My Wieferich record is 44.54 secs.
Just use a logical search pattern with ^2 block sizes.
Good luck with finding a Wieferich!

Brook HarsteProject donor
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Joined: 30 Nov 08
Posts: 1345
ID: 32401
Credit: 805,483,198
RAC: 484
Discovered 2 mega primesFound 1 prime in the 2019 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (10,334,077)Cullen LLR Turquoise: Earned 5,000,000 credits (5,010,955)ESP LLR Turquoise: Earned 5,000,000 credits (7,439,418)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,501,906)PPS LLR Sapphire: Earned 20,000,000 credits (26,697,006)PSP LLR Turquoise: Earned 5,000,000 credits (6,184,417)SoB LLR Jade: Earned 10,000,000 credits (12,120,365)SR5 LLR Turquoise: Earned 5,000,000 credits (9,234,440)SGS LLR Turquoise: Earned 5,000,000 credits (5,201,403)TRP LLR Turquoise: Earned 5,000,000 credits (5,628,223)Woodall LLR Turquoise: Earned 5,000,000 credits (5,061,985)321 Sieve Amethyst: Earned 1,000,000 credits (1,027,534)Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (17,370,919)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,014,372)PPS Sieve Double Bronze: Earned 100,000,000 credits (129,430,775)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,083,315)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,629,248)AP 26/27 Emerald: Earned 50,000,000 credits (56,876,924)GFN Double Silver: Earned 200,000,000 credits (286,079,854)PSA Double Silver: Earned 200,000,000 credits (200,556,062)
Message 69052 - Posted: 10 Sep 2013 | 1:06:16 UTC - in response to Message 69020.

But I'd still welcome any tips for further optimisation if possible.

This is the testing I did to find the sweet spot with my HD7970GHz:

threads=8, blocks=256, 3 units=2:46, average=55.3 threads=7, blocks=256, 3 units=2:47, average=55.6 threads=6, blocks=256, 3 units=2:59, average=59.6 threads=8, blocks=2048, 3 units=2:40, average=53.3 threads=8, blocks=1024, 3 units=2:35, average=51.6 threads=8, blocks=512, 3 units=2:39, average=53 threads=7, blocks=2048, 3 units=2:38, average=52.6 threads=7, blocks=1024, 3 units=2:35, average=51.6 threads=7, blocks=512, 3 units=2:43, average=54.4 threads=6, blocks=2048, 3 units=2:38, average=52.6 threads=6, blocks=1024, 3 units=2:35, average=51.6 threads=6, blocks=512, 3 units=2:36, average=52


I ended up settling on blocks=1024, threads=6 and 20 WU's at a time.
For some reason I find it a few seconds quicker with a web browser open.
My Wieferich record is 44.54 secs.
Just use a logical search pattern with ^2 block sizes.
Good luck with finding a Wieferich!

Is this with HT on or off. And how many cores?
____________

Profile Gary Craig
Volunteer tester
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Joined: 30 Dec 09
Posts: 3213
ID: 52890
Credit: 1,005,618,748
RAC: 0
Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,893,273)Cullen LLR Ruby: Earned 2,000,000 credits (2,440,687)ESP LLR Turquoise: Earned 5,000,000 credits (5,738,876)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,292,626)PPS LLR Turquoise: Earned 5,000,000 credits (9,648,951)PSP LLR Turquoise: Earned 5,000,000 credits (5,653,927)SoB LLR Jade: Earned 10,000,000 credits (10,558,341)SR5 LLR Turquoise: Earned 5,000,000 credits (5,748,705)SGS LLR Ruby: Earned 2,000,000 credits (3,335,713)TRP LLR Jade: Earned 10,000,000 credits (12,602,818)Woodall LLR Ruby: Earned 2,000,000 credits (2,282,622)321 Sieve Gold: Earned 500,000 credits (740,566)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (59,788,598)Generalized Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,143,068)PPS Sieve Double Gold: Earned 500,000,000 credits (524,673,938)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,130,821)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,074,710)AP 26/27 Sapphire: Earned 20,000,000 credits (43,842,888)GFN Double Silver: Earned 200,000,000 credits (224,648,943)PSA Emerald: Earned 50,000,000 credits (62,378,755)
Message 69058 - Posted: 10 Sep 2013 | 7:19:43 UTC - in response to Message 69020.

For some reason I find it a few seconds quicker with a web browser open.


That seems *very* odd. Only thing I can think of is that the GPU has a lower-speed power saving mode, and that just running wwwwcl doesn't knock it out of that state, but with a browser open, the card thinks it has more work to do, and goes into a higher-powered mode. That seems really farfetched though. Can't see how anything CPU-related (cache misses, HT,...) would make it run faster with more processes to service. Weird. Thanks for posting all of your benchmarks though; they may help others run similar tests on their own systems (and which may well lead them to different "sweet spot"s).

--Gary

Profile Roger
Volunteer developer
Volunteer tester
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Joined: 27 Nov 11
Posts: 1137
ID: 120786
Credit: 266,942,191
RAC: 7,885
Found 1 prime in the 2018 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,037,982)Cullen LLR Ruby: Earned 2,000,000 credits (2,015,907)ESP LLR Ruby: Earned 2,000,000 credits (2,232,391)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,088,705)PPS LLR Ruby: Earned 2,000,000 credits (2,962,062)PSP LLR Ruby: Earned 2,000,000 credits (2,539,644)SoB LLR Ruby: Earned 2,000,000 credits (2,122,524)SR5 LLR Ruby: Earned 2,000,000 credits (2,238,295)SGS LLR Ruby: Earned 2,000,000 credits (3,560,075)TRP LLR Ruby: Earned 2,000,000 credits (2,125,391)Woodall LLR Ruby: Earned 2,000,000 credits (2,037,732)321 Sieve Turquoise: Earned 5,000,000 credits (5,190,731)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (207,387)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,049,697)PPS Sieve Double Bronze: Earned 100,000,000 credits (100,422,123)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (3,227,972)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,021,659)AP 26/27 Sapphire: Earned 20,000,000 credits (20,651,644)GFN Emerald: Earned 50,000,000 credits (57,918,585)PSA Sapphire: Earned 20,000,000 credits (43,298,465)
Message 69060 - Posted: 10 Sep 2013 | 11:27:26 UTC - in response to Message 69052.
Last modified: 10 Sep 2013 | 11:45:02 UTC

Is this with HT on or off. And how many cores?

Phenom X6 1100T, 6 core CPU, AMD so no HT possible. I did these tests about 12 months ago when I first started wwwwcl.

For some reason I find it a few seconds quicker with a web browser open.

That seems *very* odd.


Its is odd and I can't explain it but that is the test result, time and again. It may be peculiar to my hardware. Phenom II CPUs have Cool‘n’Quiet and Turbo which I have disabled. The GPU however has PowerTune Technology With Boost (PT Boost) and can clock its core down to 300Mhz when idle, then go up to a full 1050Mhz under load. A plausible theory is that the GPU is idling then takes a little time to go up to full core clock. Would be easy to check with GPU-Z but I am no longer running Catalyst 12.8, required for wwwwcl.

Thanks for posting all of your benchmarks though; they may help others run similar tests on their own systems (and which may well lead them to different "sweet spot"s).

Hardware or settings any different and you'd have to run your own tests to determine the sweet spot for your hardware combination.

Message boards : Project Staging Area : Looking at Wieferich again

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