5 ms·
Running this code on an "on-prem" AMD EPYC 9454P with 12 x 64 GB DIMMs: 1 37.4 2 73.3 3 107.3 4 141.4 5 171.6 6 199.5 7 226.0 8 251.1 9 235.4
by jakebsky 3y ago
Running this code on an "on-prem" AMD EPYC 9454P with 12 x 64 GB DIMMs:
1 37.4
2 73.3
3 107.3
4 141.4
5 171.6
6 199.5
7 226.0
8 251.1
9 235.4
10 243.0
11 264.5
12 281.9
13 303.7
14 323.0
15 339.6
16 354.4
17 299.0
18 286.3
19 300.9
20 310.6
21 325.7
22 339.2
23 352.6
24 364.3
25 305.8
26 309.0
27 319.6
28 326.5
29 335.4
30 345.5
31 356.7
32 364.9
And then it settles around there.
- bgirard 3y agoWhat are the units? MB/s, GB/s
- deadmutex 3y agolooks like GB/s
- buzzdenver 3y agoSo around 3x of what AWS has? I guess this is more about what motherboard they have, and not an on-prem vs cloud difference.
- champtar 3y agoNumber of DIMM is important, I know the standard BOM at my company has way more memory that we use just to have more bandwidth.
- sliken 3y agoBandwidth increases nearly linearly with adding dimms until you get to 1 dimm per memory channel. After that there's very small improvements related to more open pages. More open pages doesn't help with pure bandwidth benchmarks though.
- adrian_b 3y ago1.5 times greater speed comes from 768-bit vs. 512-bit width of the memory interface. Another 1.5 times greater speed comes from DDR5-4800 vs. DDR4-3200. The rest may be from virtualization and other overheads.
- deleted 3y ago[deleted]