196384 2019-03-28 17:35:29 -0700 Worklist should have a more fine grained way to just stop for some VMs 2019-04-07 11:52:21 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 saam saam benjamin fpizlo ggaren gskachkov guijemont keith_miller mark.lam msaboff rmorisset ticaiolima tzagallo ysuzuki oldest_to_newest 1522305 0 saam 2019-03-28 17:35:29 -0700 ... 1522307 1 saam 2019-03-28 17:41:21 -0700 So I have a WIP patch. I'm testing on 2-core x86-64 MBP (using instruments to bring my core count down to 2 w/ hyper threading). The patch makes us go from total CPU time spent in "Heap::suspendCompilerThreads" from 34000 ms to 400ms. However, it's not a progression on bomb-workers. And there's a slight chance it's even a regression. I wonder if it's revealing other forms of contention that per-process locking was somehow saving us from. 1522309 2 saam 2019-03-28 17:49:40 -0700 When I test in four core mode, it's also repeatably just a bit slower. However, we're also repeatably spending ~2 orders of magnitude less time in Heap::suspendCompilerThreads 1522326 3 366233 saam 2019-03-28 19:02:23 -0700 Created attachment 366233 WIP 1525087 4 366906 saam 2019-04-07 11:52:21 -0700 Created attachment 366906 WIP Stashing this WIP here. 366233 2019-03-28 19:02:23 -0700 2019-04-07 11:52:21 -0700 WIP patch.diff text/plain 8865 saam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9kZmcvREZHV29ya2xpc3QuY3BwCj09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT0KLS0tIFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9kZmcvREZHV29ya2xpc3QuY3BwCShyZXZpc2lv biAyNDM2MjUpCisrKyBTb3VyY2UvSmF2YVNjcmlwdENvcmUvZGZnL0RGR1dvcmtsaXN0LmNwcAko d29ya2luZyBjb3B5KQpAQCAtMzIsOSArMzIsMTIgQEAKICNpbmNsdWRlICJKU0NJbmxpbmVzLmgi CiAjaW5jbHVkZSAiUmVsZWFzZUhlYXBBY2Nlc3NTY29wZS5oIgogI2luY2x1ZGUgPG11dGV4Pgor I2luY2x1ZGUgPHd0Zi9TY29wZS5oPgogCiBuYW1lc3BhY2UgSlNDIHsgbmFtZXNwYWNlIERGRyB7 CiAKK3N0YXRpYyBjb25zdCBib29sIG9sZFdheSA9IGZhbHNlOworCiAjaWYgRU5BQkxFKERGR19K 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