[GPU] Use array for tracking memory usage instead of map #25269
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build_jenkins |
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Hi @ialbrecht, |
We had benchmarks were memory allocation was on the critical performance path and we were looking at all possible ways to optimize it. |
vladimir-paramuzov
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vladimir-paramuzov
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Jul 3, 2024
`std::map` has very slow access are requires lock on every access. We can use `std::array` instead to hold compile time known number of buckets. This method should have less latency and memory overhead, as well as possibly no lock on access.
No need to lock mutex to update atomic values
Make sure atomic values are zero initialized.
As in description
`fetch_add` returns old value, therefore we need to increment current memory usage value before storing current max.
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Details:
std::maphas very slow access are requires lock on every access. We can usestd::arrayinstead to hold compile time known number of buckets.arraycontainer has lower access latency and memory overhead.