[SYCL] Don't use zstd context across threads.
#19942
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`ZSTDCompressor` holds `zstd` context as its only data members. The idea behind `GetSingletonInstance()` method was to re-use these contexts for subsequent compression and decompressions. Re-using context across (de)compression reduces system memory usage. However, `zstd` contexts are not meant to be used concurrently, therefore, this PR makes `ZSTDCompressor` object thread-local, instead of static. Relevant excerpt from zstd doc (https://facebook.github.io/zstd/zstd_manual.html): > When decompressing many times, > it is recommended to allocate a context only once, > and re-use it for each successive compression operation. > This will make workload friendlier for system's memory. > Use one context per thread for parallel execution.
AlexeySachkov
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AlexeySachkov
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AlexeySachkov
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uditagarwal97
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Sep 3, 2025
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This is a cherry-pick of #19747
ZSTDCompressorholdszstdcontext as its only data members. The idea behindGetSingletonInstance()method was to re-use these contexts for subsequent compression and decompressions. Re-using context across (de)compression reduces system memory usage.However,
zstdcontexts are not meant to be used concurrently, therefore, this PR makesZSTDCompressorobject thread-local, instead of static.Relevant excerpt from zstd doc
(https://facebook.github.io/zstd/zstd_manual.html):