Diogo Netto

[rfc] parallel marking

15

This PR extends the refactoring from https://github.com/JuliaLang/julia/pull/45608 by parallelizing the GC mark-loop. Some benchmark results are here: https://hackmd.io/@Idnmfpb3SxK98-OsBtRD5A/HJn86Bl25 ## TODO - [x] Move work-stealing queue implementation to separate file. -...

GC mark-loop rewrite

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This PR simplifies the GC mark-loop code. Some benchmark results are shown here: https://hackmd.io/XZDp98lTR3qyYgsWKCTvnQ. I believe these changes could bring some performance benefits as well (particularly if used with prefetching...

optimize remset marking

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Tag the lowest bit of a pointer to indicate it's in the remset and enqueue objects in the remset for later processing when GC threads have woken up, instead of...

Should fix https://github.com/JuliaLang/julia/issues/52757, https://github.com/JuliaLang/julia/issues/53026 and https://github.com/JuliaLang/julia/issues/53350. Removes some of the awkwardness from https://github.com/JuliaLang/julia/pull/53351 but does require waiting for all threads to join at the end of mark-loop.

Possible bug in 1.9 heuristics branch

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[This](https://github.com/JuliaLang/julia/blob/8e5136fa2979885081cd502d2210633dff1d2a1a/src/gc.c#L3611) should probably be `not_freed_enough`, since that's the case we want to let the interval increase. CC: @gbaraldi

Canonicalize names of nested functions by keeping a more fine grained counter -- per (module, method name) pair

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As mentioned in https://github.com/JuliaLang/julia/pull/53716, we've been noticing that `precompile` statements lists from one version of our codebase often don't apply cleanly in a slightly different version. That's because a lot...

don't reset array length and size fields on array_to_string

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Should fix https://github.com/JuliaLang/julia/issues/54275.

Possible bug when constructing a string from an array of characters

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Consider the MWE provided by @tveldhui: ```Julia function foo() String(UInt8['a' for i in 1:10000000]) end function test() GC.gc(true) baseline = Base.gc_live_bytes() while true foo() GC.gc(true) print("gc_live_bytes = +$((Base.gc_live_bytes() - baseline)/1024^2)MiB\n")...

Move GC to its own directory and library

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With the ongoing MMTk effort, we are aiming to make the GC more modular and allow users to specify at build time different GC implementations they want for Julia. This...

prepend signal number and thread ID on backtraces

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These extra information on the backtraces proved useful for us when filtering which servers failed due to a segmentation fault, for instance, and when diagnosing crashes in production more in...