Free mem trigger with all2all for sync trigger eviction #5062
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Summary: X-link: facebookresearch/FBGEMM#1997 As title, `has_running_evict` and `trigger_feature_evict` are needed to support sync trigger eviction Reviewed By: kathyxuyy Differential Revision: D83896308
Summary: X-link: facebookresearch/FBGEMM#2067 X-link: meta-pytorch/torchrec#3442 Before KVZCH is using ID_COUNT and MEM_UTIL eviction trigger mode, both are very tricky and hard for model engineer to decide what num to use for the id count or mem util threshold. Besides that, the eviction start time is out of sync after some time in training, which can cause great qps drop during eviction. This diff is adding support for free memory trigger eviction. It will check how many free memory left every N batch in every rank and if free memory below the threshold, it will trigger eviction in all tbes of all ranks using all reduce. In this way, we can force the start time of eviction in all ranks. Differential Revision: D83896528
Summary: X-link: meta-pytorch/torchrec#3490 X-link: facebookresearch/FBGEMM#2070 Before KVZCH is using ID_COUNT and MEM_UTIL eviction trigger mode, both are very tricky and hard for model engineer to decide what num to use for the id count or mem util threshold. Besides that, the eviction start time is out of sync after some time in training, which can cause great qps drop during eviction. This diff is adding support for free memory trigger eviction. It will check how many free memory left every N batch in every rank and if free memory below the threshold, it will trigger eviction in all tbes of all ranks using all reduce. In this way, we can force the start time of eviction in all ranks. Differential Revision: D85604160
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…#3490) Summary: X-link: pytorch/FBGEMM#5062 X-link: facebookresearch/FBGEMM#2070 Before KVZCH is using ID_COUNT and MEM_UTIL eviction trigger mode, both are very tricky and hard for model engineer to decide what num to use for the id count or mem util threshold. Besides that, the eviction start time is out of sync after some time in training, which can cause great qps drop during eviction. This diff is adding support for free memory trigger eviction. It will check how many free memory left every N batch in every rank and if free memory below the threshold, it will trigger eviction in all tbes of all ranks using all reduce. In this way, we can force the start time of eviction in all ranks. Differential Revision: D85604160
EddyLXJ
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Oct 27, 2025
Summary: X-link: meta-pytorch/torchrec#3490 X-link: facebookresearch/FBGEMM#2070 Before KVZCH is using ID_COUNT and MEM_UTIL eviction trigger mode, both are very tricky and hard for model engineer to decide what num to use for the id count or mem util threshold. Besides that, the eviction start time is out of sync after some time in training, which can cause great qps drop during eviction. This diff is adding support for free memory trigger eviction. It will check how many free memory left every N batch in every rank and if free memory below the threshold, it will trigger eviction in all tbes of all ranks using all reduce. In this way, we can force the start time of eviction in all ranks. Differential Revision: D85604160
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Summary:
X-link: meta-pytorch/torchrec#3490
X-link: https://github.com/facebookresearch/FBGEMM/pull/2070
Before KVZCH is using ID_COUNT and MEM_UTIL eviction trigger mode, both are very tricky and hard for model engineer to decide what num to use for the id count or mem util threshold. Besides that, the eviction start time is out of sync after some time in training, which can cause great qps drop during eviction.
This diff is adding support for free memory trigger eviction. It will check how many free memory left every N batch in every rank and if free memory below the threshold, it will trigger eviction in all tbes of all ranks using all reduce. In this way, we can force the start time of eviction in all ranks.
Differential Revision: D85604160