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Showing results 1 to 25 of 112 Search took 0.00 seconds. Search: Posts Made By: wkernkamp

Forum: Hardware April 23, 2024, 16:56

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp You did not ask about SSD's before. In general,... You did not ask about SSD's before. In general, the disk storage is not a big factor because the data gets cached in RAM. So repeated reads from disk are read from RAM instead. Then there is the...

Forum: Hardware April 21, 2024, 14:01

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp The number of cores is less important than the... The number of cores is less important than the total bandwidth. If you search "intel ark E7-8880" you will find that all three processors have the same 85 GB/s bandwidth. This means that the eight...

Forum: Hardware April 20, 2024, 20:32

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp This is a fun puzzle! I think that you need... This is a fun puzzle! I think that you need at least two ranks per channel to reach maximum throughput, because the controller alternates addressing these ranks for better performance. It is...

Forum: Hardware April 20, 2024, 16:07

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp My fastest Xeon v4 system is in the thread here:... My fastest Xeon v4 system is in the thread here: https://www.cfd-online.com/Forums/hardware/198378-openfoam-benchmarks-various-hardware-35.html#post847273 It has this performance for comparison...

Forum: Hardware April 20, 2024, 16:00

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp The available bandwidth for your 8 channel system... The available bandwidth for your 8 channel system is: DDR4-2133: 8*2133*8=136.5 GB/s DDR4-2400: 8*2400*8=153.6 GB/s Both your measurements do not reach the true limit. On a dual socket system,...

Forum: Hardware April 19, 2024, 18:48

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp I recommend you go for cache because it helps... I recommend you go for cache because it helps memory performance which is critical for CFD. In addition, more cache usually means more chiplets. Each chiplet contributes it's own infiniti fabric...

Forum: Hardware March 30, 2024, 02:50

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp I don't know if that is true. He had on his... I don't know if that is true. He had on his first run a recognizable pattern already each 24 cores.

Forum: Hardware March 28, 2024, 22:10

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Interesting that the multiples of 24 show in the... Interesting that the multiples of 24 show in the result.

Forum: Hardware March 25, 2024, 16:47

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Yes, I have gone down to 6200 MT/s and FCLK at... Yes, I have gone down to 6200 MT/s and FCLK at 2067. On the 7800x3d the infinity fabric is the bottleneck. So I have FCLK:UCLK:MCLK 2:3:3. My performance improved to: Flow Calculation: 1...

Forum: Hardware March 13, 2024, 12:51

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Ran this on 7800x3d and OpenFOAM v2312. Had to... Ran this on 7800x3d and OpenFOAM v2312. Had to use the original setup, because of some naming changes in OpenFOAM. However, easy to insert the mirror operation in the old template. Meshing...

Forum: Hardware March 4, 2024, 18:07

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp 7800x3d Processor: AMD 7800X3D Motherboard: Gygabyte A620M S2H Memory: Team T-Force Delta RGB 32GB (2 x 16MB) / 288-Pin DDR5 SDRAM / DDR5 6400 / 40 Power supply: Lenovo 54Y8886 24 Pin 240 W SFF for lenovo...

Forum: Hardware October 29, 2023, 19:43

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp There is a bios configuration with just 16 cores... There is a bios configuration with just 16 cores active per processor. Would be interesting to see if you get better performance.

Forum: Hardware September 20, 2023, 04:47

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Congratulations on your result. Also, very nice... Congratulations on your result. Also, very nice presentation with the other comparable results. What version of OpenFOAM are you running?

Forum: Hardware August 25, 2023, 22:06

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Nice result! Impressive on first try too. Did... Nice result! Impressive on first try too. Did you have anything else running during the 64 core run? It has no cores or threads to spare, so that would be my guess. I usually leave hyper...

Forum: Hardware July 28, 2023, 15:15

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp I have not run this cpu myself. However, I seem... I have not run this cpu myself. However, I seem to remember that the RAM was run at 4800 MT/s. That would be 33% faster. If you can run your memory at that frequency you might reduce your run time...

Forum: Hardware July 26, 2023, 21:21

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp OpenFOAM solutions at higher core count are... OpenFOAM solutions at higher core count are determined by memory bandwidth. The bandwidth to the various caches is much higher than the bandwidth to memory. In fact the memory will not even come...

Forum: Hardware July 25, 2023, 12:34

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp That is based on a 100x40x40 grid, which is... That is based on a 100x40x40 grid, which is really a small problem. The benefit of the L3 cache reduces the larger the problem.

Forum: Hardware May 2, 2023, 11:52

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Go for it! Go for it!

Forum: Hardware April 28, 2023, 21:17

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp You could also look into upgrading to Ivy Bridge... You could also look into upgrading to Ivy Bridge (Xeon E5 v2) instead of getting extra nodes. The prices for the processors are low: E5-2697 v2 domestic 4 day $37.50 and $32 from China. They have...

Forum: Hardware April 19, 2023, 13:21

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Yes, I think so. Yes, I think so.

Forum: Hardware April 18, 2023, 16:58

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp No, you can change the memory frequency (you can... No, you can change the memory frequency (you can try) by going into the BIOS and set frequency from "auto" to "2400". Most likely, your DDR4-2133 will be able to be forced to run as DDR4-2400. ...

Forum: Hardware April 15, 2023, 20:24

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp René, I presume you now have eight RDIMMs... René, I presume you now have eight RDIMMs of DDR4-2133, one DIMM per channel. So you can still improve by going to DDR4-2400, when you get your inheritance. Otherwise, you now have one of...

Forum: Hardware April 8, 2023, 23:57

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp Domenico, In this thread, we compare... Domenico, In this thread, we compare hardware against the same case. This case should not be changed by changing the input, otherwise, the comparisons don't work. I suggest you start a...

Forum: Hardware April 7, 2023, 16:42

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp 1/ At high core count per channel, the solution... 1/ At high core count per channel, the solution is bottle necked in memory bandwidth. For example, my E5-2697Av4 is just 2% faster than my E5-2683v4 in the same machine. These cpus are the same,...

Forum: Hardware April 7, 2023, 16:36

Replies: 778 Sticky: OpenFOAM benchmarks on various hardware Views: 198,251 Posted By wkernkamp 1/ At high core count per channel, the solution... 1/ At high core count per channel, the solution is bottle necked in memory bandwidth. For example, my E5-2697Av4 is just 2% faster than my E5-2683v4 in the same machine. These cpus are the same,...

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