Comments (5)
tibbe
commented on June 9, 2024
Have a look at https://ghc.haskell.org/trac/ghc/ticket/8972#comment:1. It looks like contended IORefs scale very poorly. I will try to use the C implementation I gave in that ticket in ekg. Should make things up to orders of magnitude faster.
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cartazio
commented on June 9, 2024
can't post on trac for some reason right now (the spam filter dislikes me), but related tickets that compliment the unboxed reference idea are https://ghc.haskell.org/trac/ghc/ticket/8157 and https://ghc.haskell.org/trac/ghc/ticket/7883#comment:16
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cartazio
commented on June 9, 2024
atomicmodifyIORef has a whole busy wait loop structure that probably adds a bunch of overhead too
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jberryman
commented on June 9, 2024
the fetch-and-add primop exposed in atomic-primops tends to perform very well (on x86) if you want a slightly simpler solution. Be sure to make your own counter that's padded on it's own cache line
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cartazio
commented on June 9, 2024
yeah, cacheline width padding is a VERY important detail
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Related Issues (20)
- Javascript exception: Cannot read property 'gc' of undefined
- Timestamps overlap sometimes
- Put "Required configuration" in the README HOT 4
- Add wall clock time and CPU time HOT 3
- Fails to build on GHC8 HOT 5
- Don't rethrow ThreadKilled HOT 2
- How to remove the GC metrics? HOT 2
- Add Cabal flag to embed assets with TH HOT 8
- -with-rtsopts=-T results in severe slowdown HOT 3
- README should guide users wrt the ekg eco-system HOT 1
- Build with ghc 8.4 (base-4.11) HOT 4
- Exception in handler sampling all metrics
- How to stop or uninstall this service HOT 1
- Maximum residency wrong? HOT 1
- Build and release with GHC 8.6.x HOT 3
- Add tags support HOT 1
- GHC 8.10 support HOT 3
- Compatibility with GHC 9.0
- Fail to restart monitoring server with the same Store
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