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nik-io avatar nik-io commented on September 6, 2024

This might have to do with the amount of dynamic table grows required to fit the larger dataset. The default table size is equal to a single segment, which defaults to 512MiB, I believe

uDepot/src/include/uDepot/udepot-lsa.hh

Line 37 in 5b9d9f4

#define UDEPOT_DEFAULT_SEGMENT_SIZEB (1UL<<29) // bytes

You can try increasing that to 1 or 2 GiB and see if it helps.
Another thing that might affect performance could be the contention on the hash table. You can check if that’s the case if you run single thread mode and the performance issue goes away. In that case, you could increase the number of hash table locks.
If none of the above work, then I suggest to try different, growing combinations of thread count and trt-tasks parameter (per thread task parallelism) and see how they scale for the different test sizes. These should help identify where the problem is.

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Cha465 avatar Cha465 commented on September 6, 2024

Thanks! Found out that load imbalance caused this (I have modified workload distribution to zipfian and used customized network stack).

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