Throttle evictions to one w2r task at a time#763
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No need to go berserk and have multiple concurrent evictions going. Signed-off-by: Joseph Schuchart <joseph.schuchart@stonybrook.edu>
bosilca
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May 8, 2026
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A single w2r task can generate at most MAX_PARAM_COUNT transfers, which is a small number compared with the total number of times that exists on modern GPUs. If we only generate a single w2r at the time, we are likely to pay the w2r latency all the time, because MAX_PARAM_COUNT data are quickly reused.
Let's do instead a middleground. We allow up to MAX_W2R tasks to coexists (where MAX_W2R is an MCA parameter). Same logic as here, except that we allow more than one by default, but users can set MAX_W2R to 1 to get this sequential-looking data eviction.
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Superseded by #773, closing. |
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No need to go berserk and have multiple concurrent evictions going.