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 2022-10-03, 14:59 #78 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 22×1,229 Posts @VBCurtis: I have adjusted my script up through t40 for my smaller GPU (greater t later) and will be looking at the script further for my larger GPU, now that I finally have it working with GMP-ECM and CGBN. The larger one has 1536 cores. Thanks much!
 2022-10-03, 15:29 #79 gd_barnes     May 2007 Kansas; USA 3×3,793 Posts You'll have to let me know how long it takes you to run ECM for t40 to t45 on a ~155-160 digit number.
 2022-10-03, 16:48 #80 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 22×1,229 Posts My previous post should have said t45. I haven't decided yet for t50 and am not running there. I have a run for the c155 for 65^89 just started. It's set to do t40 and then t45. I think the GPU time would be the same for 155 and 160, but the stage 2 CPU timing would be different. Stage 2 is done on a 40-thread machine, separately.
 2022-10-03, 23:08 #81 gd_barnes     May 2007 Kansas; USA 3×3,793 Posts I wasn't clear if you were responding to my question. I didn't see anything about how much time it was for t40 to t45 for you. (Or maybe you were just beginning to test that process.) I'm getting ~1.65-1.75 hours on my Ryzen. I got consistently ~15 mins. for t35 to t40. Since it's a big jump, mainly I want to verify that it's worth my time to run some of them from t40 to t45 or if your process is substantially faster. Last fiddled with by gd_barnes on 2022-10-03 at 23:09
 2022-10-04, 00:21 #82 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 114648 Posts I don't have the best setup for real throughput, but here's a description with timings for both the c155 and the c160. First, the overall timing is affected by the fact that if I'm running two (or more) levels, stage 2 is completed on the second machine while the next level of stage 1 is completed on the GPU. If I'm running only a single level the GPU machine has to wait for the CPU stage 2 returns. Having described that, here are the timings for the different stages and sizes: Code: c155 t40 stage 1: 26:16 c155 t40 stage 2: 6:20 c155 t45 stage 1: 1:51:31 c155 t45 stage 2: 17:37 c160 t40 stage 1: 26:13 c160 t40 stage 2: 6:35 c160 t45 stage 1: 1:51:29 c160 t45 stage 2: 17:36 The timings appear the same between the two sizes. I expected this for the GPU, but am surprised it is the same for the CPU. I've finished the c145s. I'm not sure if I'll head for the c146s just yet or do some other stuff first. I'll figure that out later.
 2022-10-04, 00:55 #83 gd_barnes     May 2007 Kansas; USA 3×3,793 Posts I'm not sure what the stages are. But even if I'm only running stage 1, I'm still a bit faster. Although your description of your processes makes me wonder if a direct comparison of that nature is reasonable. Regardless, I feel like it's close enough that it makes sense for me to contribute for t45. I'll let you know what I do. My jump in time was bigger than yours going from t35 to t40 vs. t40 to t45. ~15 mins vs. ~100-105 mins. About a 7x jump. Yours was ~4x. So if the jumps continued like that, it probably wouldn't make sense for me to contribute much past t45 unless I was to learn more about optimizing. I have done nothing for optimization. Just strictly default ECM parameters. The optimization that you guys talk about goes over my head at this point. It's interesting that your timings are about the same for different sizes but that doesn't surprise me much for such a small difference in sizes. I don't get much difference in times for those either but I do for a bigger size difference, perhaps ~10-15% for a C150 vs. a C180. You should try a bigger difference like that. Last fiddled with by gd_barnes on 2022-10-04 at 01:02

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