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Showing results 1 to 25 of 108 Search took 0.00 seconds. Search: Posts Made By: flotus1

Forum: Hardware March 29, 2024, 07:35

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 True in theory, when scattering threads across... True in theory, when scattering threads across CCDs. In order to actually see this, quite a bit of effort would be necessary, in order to reduce run-to-run variance. Additionally, with this many...

Forum: Hardware January 8, 2024, 05:22

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Everything else about the benchmark case being... Everything else about the benchmark case being equal, scaling can't really get worse with higher cell count. Parallelization overhead for MPI+domain decomposition decreases as cell count increases....

Forum: Hardware November 6, 2023, 02:18

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Do you mean the compiled data in the first post... Do you mean the compiled data in the first post of this thread? eric collected the data at an early stage, when the amount of contributions was still manageable. Now we are at over 700 posts in...

Forum: Hardware September 1, 2023, 02:36

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Running several instances simultaneously on lower... Running several instances simultaneously on lower thread counts is not faster with the benchmark in this thread. This only works when something other than the memory subsystem -including last level...

Forum: Hardware August 26, 2023, 04:35

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 I can think of a few things that might contribute... I can think of a few things that might contribute to the outlier at 64 threads: Some heavy background processes, thermal throttling, sub-optimal core binding, missing memory channels, an excessive...

Forum: Hardware July 24, 2023, 05:56

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 The results look pretty tame compared to "normal"... The results look pretty tame compared to "normal" Epyc Milan without 3D-Vcache. Comparing to my results with two 7543:...

Forum: Hardware March 18, 2023, 06:26

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Efficiency sure is good with Apple's new chips. ... Efficiency sure is good with Apple's new chips. Then again, if one wanted to tweak Intel's 13th gen desktop CPUs for efficiency, I am sure there is A LOT to be gained here. Out of the box, an...

Forum: Hardware March 7, 2023, 17:43

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 I have my doubts that these numbers reflect the... I have my doubts that these numbers reflect the actual capabilities of your CPUs. I contributed some benchmarks for regular (non-X) 32-core Milan CPUs here, that are only slightly slower. Your...

Forum: Hardware March 7, 2023, 11:24

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 There is no faster RAM available for these CPUs.... There is no faster RAM available for these CPUs. And once there is, it will still have to be run at 4800MT/s. It's a server platform, memory overclocking won't work. The boards don't offer the...

Forum: Hardware January 11, 2023, 05:40

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Part of the reason you see worse scaling with... Part of the reason you see worse scaling with your system is the faster single-core time you got. For a more intuitive comparison, I would recommend scaling both results by the same single-core...

Forum: Hardware December 3, 2022, 05:14

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Not in this thread right here, but the topic came... Not in this thread right here, but the topic came up from time to time. Relative positions of CPUs make no sense, benchmark numbers are reported for systems that should not have enough memory to run...

Forum: Hardware November 17, 2022, 14:57

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 We will have to wait for someone more... We will have to wait for someone more knowledgeable with OpenFOAM to get to the bottom of this. In the meantime, you should upload the log files. Not only from the solver run, but especially from the...

Forum: Hardware November 17, 2022, 09:44

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Which exact version of OpenFOAM are you trying to... Which exact version of OpenFOAM are you trying to run? There are 3 scripts, two of which I added under "Moderator note" in the first post for more recent versions. Each of them is supposed to work...

Forum: Hardware November 13, 2022, 15:55

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Thanks, I added your files on the bottom of the... Thanks, I added your files on the bottom of the first post. At some point, we might want to think about a successor to this thread. But that should be done by someone who knows more about operating...

Forum: Hardware November 13, 2022, 15:29

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 @naffrancois The charts appear to be very low... @naffrancois The charts appear to be very low resolution, at least on my end. If that's a problem with the file limits enforced by the forum software, you can upload them to an image sharing site...

Forum: Hardware November 10, 2022, 16:54

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 9554 should be a 64-core part. It's the 96-core... 9554 should be a 64-core part. It's the 96-core 9654 that has a 49% advantage in this benchmark. It's only a 28% increase for the 64-core comparison. Or if we want to leave 3D v-cache out of the...

Forum: Hardware November 4, 2022, 18:58

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 If *someone* were to compile such a chart, I... If *someone* were to compile such a chart, I would be happy to include it in the first post.

Forum: Hardware November 4, 2022, 07:00

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Yes, they do. The mesh used here is large enough... Yes, they do. The mesh used here is large enough so the results are also applicable to much higher cell counts. Base clock speeds for these CPUs don't really tell us much about actual performance....

Forum: Hardware November 2, 2022, 09:15

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Just the usual: NPS=4 -> results in a total of 8... Just the usual: NPS=4 -> results in a total of 8 NUMA nodes Or if it's available, depending on your motherboard: ACPI SRAT L3 cache as NUMA domain -> results in 16 NUMA nodes. The latter is...

Forum: Hardware November 2, 2022, 04:51

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 That's awesome! If you don't mind, could you... That's awesome! If you don't mind, could you run the 64-thread case once more? Since you are the first person here with Milan-X, I would really like to know where the limits are. first clear...

Forum: Hardware October 23, 2022, 10:41

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Epyc Rome:... Epyc Rome: https://www.cfd-online.com/Forums/hardware/198378-openfoam-benchmarks-various-hardware-14.html#post804863 Epyc Naples:...

Forum: Hardware August 20, 2022, 11:34

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 It's less about scaling, and more "performance... It's less about scaling, and more "performance per core". The added L3 cache give a performance uplift at all thread counts, and thus won't allow better scaling beyond 32 cores. That and the 9000€...

Forum: Hardware August 20, 2022, 09:38

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Yes, both the amount of cash and the amount of... Yes, both the amount of cash and the amount of cache have an impact on performance. As you already noticed, there is not much to be gained beyond 32 cores per CPU. If you want further improvements,...

Forum: Hardware August 20, 2022, 03:29

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 I can't rerun the case since I no longer have... I can't rerun the case since I no longer have access to this computer. However... One of the goals for proper benchmarking is reducing variance. Controlling core binding is one necessary step...

Forum: Hardware August 19, 2022, 16:52

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 197,963 Posted By flotus1 Looking good! CPU core frequency between our... Looking good! CPU core frequency between our CPUs should not differ vastly. For explaining the remainder of the diference, my money is on code optimization. I.e. me compiling the code on the...

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