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darachennis's profile
Testin Quarantino
Testin Quarantino
Testin Quarantino
@darachennis

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Testin Quarantino

@darachennis

Dilm Firector

Berlin, Germany
Joined September 2008

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    1. Heinz N. Gies‏ @heinz_gies Jan 9
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      I recently had a run-in with a 3x performance diff for @rustlang on the new @amd Threadripper with multi threadded applications. It seems to be related to the layout, I wonder if anyone is interested in me digging deeper into this?

      8 replies 4 retweets 55 likes
      Show this thread
    2. Raymond Siu‏ @raymondsiu Jan 9
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      Replying to @heinz_gies @rustlang @AMD

      3x performance improvement on Threadripper? ⛏️🦀

      1 reply 0 retweets 1 like
    3. Heinz N. Gies‏ @heinz_gies Jan 9
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      Replying to @raymondsiu @rustlang @AMD

      Not over intel, over not using explicit core placement. The interesting part is that when left to the linux scheduler performance is horrendously slow.

      1 reply 0 retweets 0 likes
    4. Raymond Siu‏ @raymondsiu Jan 9
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      Replying to @heinz_gies @rustlang @AMD

      Does it look like Linux is not taking advantage of the extra cores? Or is the Rust application itself not taking advantage of the extra cores?

      1 reply 0 retweets 0 likes
    5. Heinz N. Gies‏ @heinz_gies Jan 9
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      Replying to @raymondsiu @rustlang @AMD

      Neither, it seems to be inter thread communication cost between CCX’s or CCD’s but I don’t want to assume too much as I’m not 100% sure what the cause is - just that if it’s talking between core 0,1,3 (or 2,3,4 on a 3960X) it’s fast, if you get out of the grouping it’s slow.

      2 replies 0 retweets 0 likes
    6. experquisite‏ @experquisite Jan 9
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      Replying to @heinz_gies @raymondsiu and

      Is linux’s NUMA core model correct? Would expect bad IPC inter-cluster but would also expect Linux to try and keep related threads on the same cluster...

      1 reply 0 retweets 2 likes
    7. Heinz N. Gies‏ @heinz_gies Jan 9
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      Replying to @experquisite @raymondsiu and

      Idk yet I think it does at least based on the default conf. The 3900 threadripper expose a single numa node by default afaik so Linux can’t learn much about it.

      1 reply 0 retweets 0 likes
    8. Testin Quarantino‏ @darachennis Jan 9
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      Replying to @heinz_gies @experquisite and

      Some MPI / HT Condor folk had to perform some tweaks to optimize affinity on threadripper - some of their tests might be worth replicating https://blog.michael.kuron-germany.de/2018/09/amd-ryzen-threadripper-numa-architecture-cpu-affinity-and-htcondor/ …

      1 reply 0 retweets 1 like
    9. electrified filth‏ @sadisticsystems Jan 9
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      Replying to @darachennis @heinz_gies and

      the fact that it lies about not being NUMA sounds megabad. that totally shreds cache coherency performance.

      1 reply 0 retweets 2 likes
      Testin Quarantino‏ @darachennis Jan 9
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      Replying to @sadisticsystems @heinz_gies and

      Yep, far too fishy...

      4:50 PM - 9 Jan 2020 from Berlin, Germany
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Heinz N. Gies‏ @heinz_gies Jan 9
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          Replying to @darachennis @sadisticsystems and

          That’s changed however with Zen 2, where it gest more complicated to the point that I think NUMA isn’t enough to express it any more. The 3000 chips are a single NUMA core, at least from the point of view of the M - Memory, they moved the controller from the CCD to the IO Die

          1 reply 0 retweets 1 like
        3. Heinz N. Gies‏ @heinz_gies Jan 9
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          Replying to @heinz_gies @darachennis and

          That’s not entirely correct it seems, just reading up on the architecture, even so it’s on the IO die it’s still assigned a to a compute unit so there is still affinity.

          0 replies 0 retweets 2 likes
        4. End of conversation

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