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Fork backtrace-rs and modify MAPPINGS_CACHE_SIZE to 10 #184

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hehechen opened this issue Dec 8, 2022 · 0 comments
Open

Fork backtrace-rs and modify MAPPINGS_CACHE_SIZE to 10 #184

hehechen opened this issue Dec 8, 2022 · 0 comments

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@hehechen
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hehechen commented Dec 8, 2022 •
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The overhead of dwarf resolving symbol is larger than that of frame pointer.
The root cause is that the backtrace of DWARF is deeper than that of frame pointer. So DWARF need to resolve more shared libraries when resolving symbols. But the capacity of lib cache in backtrace-rs is only 4, so cache miss will occurs frequently in DWARF scenarios.
I created a PR to make MAPPINGS_CACHE_SIZE configurable , but it has not been discussed and merged. I think we can fork backtrace-rs and modify MAPPINGS_CACHE_SIZE to 10.
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Fork backtrace-rs hehechen/pprof-rs
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@hehechen