Hi, Recently my trunk builds have been sluggish at times. It varies a lot, but some days I have lots of pauses. It seems to happen when I have lots of bugzilla tabs open, though I'm not certain that's a factor. I also use Chatzilla, which may be a factor.
A number of the times it's happened I've run |perf top|, which is like |top| but works at the level of functions rather than processes. Here's a typical result when a bad pause is occurring: 18.08% perf-2573.map [.] 0x00007f2d41c0cf1d 6.04% libxul.so [.] js::jit::GetElementIC::update(JSContext*, u 4.92% libxul.so [.] js::Shape::search(js::ExclusiveContext*, js 4.53% libxul.so [.] js::types::TypeMonitorResult(JSContext*, JS 3.84% libxul.so [.] js::ShapeTable::search(long, bool) 2.55% libxul.so [.] js::baseops::GetProperty(JSContext*, JS::Ha 2.26% libc-2.17.so [.] __strstr_sse42 2.21% libxul.so [.] js::baseops::GetPropertyNoGC(JSContext*, JS 1.46% libxul.so [.] js::jit::GetPcScript(JSContext*, JSScript** 1.32% libxul.so [.] JSObject::lookupGeneric(JSContext*, JS::Han 1.27% libxul.so [.] js::jit::IonFrameIterator::operator++() 1.27% libc-2.17.so [.] __strcmp_sse42 1.19% libxul.so [.] js::types::AutoEnterAnalysis::~AutoEnterAna 1.11% libc-2.17.so [.] __memcpy_ssse3_back 1.09% libc-2.17.so [.] _int_malloc 1.03% libxul.so [.] js::jit::IonFrameIterator::script() const 0.91% libxul.so [.] js::types::TypeSet::hasType(js::types::Type 0.91% libc-2.17.so [.] __strlen_sse2_pminub 0.84% libxul.so [.] js::jit::OperatorIn(JSContext*, JS::Handle< 0.68% libxul.so [.] js::ObjectImpl::nativeLookup(js::ExclusiveC 0.64% libxul.so [.] JSAtom* js::ToAtom<(js::AllowGC)0>(js::Excl The percentage indicates how many samples are occurring in each function. Any suggestions what might be going on here? Some kind of property access, I'd guess. Nick _______________________________________________ dev-tech-js-engine-internals mailing list dev-tech-js-engine-internals@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-tech-js-engine-internals
