Closed Bug 1398140 Opened 3 years ago Closed 3 years ago
Consider removing the Ion helper thread pausing
We have this mechanism where we allow 1 helper thread at a time to do Ion compilation. If a higher priority task comes in, we can pause other compilation threads, process the new task on a new thread, then unpause the paused thread(s). This adds quite a lot of complexity (to code that's already complicated enough!). It also has some issues: * We would like to Ion-compile scripts in parallel, especially when the CPU has 4+ cores. * Pausing compilation threads means these threads are not available for other tasks (GC, Wasm, parsing). * IonBuilderHasHigherPriority includes the size and warm up count of the outer script, but due to inlining it's not clear whether that's very useful. Removing the pausing mechanism improves shell benchmarks a bit locally. I'll check how this affects Speedometer on AWFY.
Mostly just removing code: 5 files changed, 9 insertions(+), 185 deletions(-) This improves shell benchmarks locally. I'm not sure about Speedometer (my AWFY-Try run failed for some reason). I think we should just land it and see what happens on AWFY.
Assignee: nobody → jdemooij
Status: NEW → ASSIGNED
Attachment #8906512 - Flags: review?(luke)
Comment on attachment 8906512 [details] [diff] [review] Patch Review of attachment 8906512 [details] [diff] [review]: ----------------------------------------------------------------- Great!
Attachment #8906512 - Flags: review?(luke) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/ab8c75e0d422 Remove Ion helper thread pausing mechanism. r=luke
For posterity: some minor regressions on AWFY but overall this was an improvement. 7-9% on Kraken crypto-ccm, 2.2% on Octane mandreel, small win on Sunspider. Some of the improvements are bigger on 32-bit (> 11% on Kraken crypto-ccm). Not too bad for a code removal patch. Will be interesting to see if this has any effect on the (slower) QF hardware or on Talos.
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