On Tuesday, May 30, 2017 at 5:44:34 AM UTC-7, David Teller wrote: > Hi Nathan, > > I'm sorry I can't answer your questions. I haven't heard of any > regression, but I don't think we perform regular testing on RPi. Do you, > by any chance, have profiles for both versions? I can't promise that > someone will have time to look at them, but if someone does, it would be > helpful. > > Cheers, > David > > On 5/16/17 3:18 AM, nathanrogers--- via dev-tech-js-engine-internals wrote: > > Hello, > > > > I work on a project called Cobalt (cobalt.foo), it is an application > > container designed to run web apps (namely youtube.com/tv) on embedded TV > > devices. We use SpiderMonkey as our JavaScript engine, and are currently > > in the process of rebasing from SpiderMonkey 24 to SpiderMonkey 45. On our > > application specific benchmarks, which measure input latency, which > > effectively measures total JavaScript execution time, we are noticing a > > performance regression of about 40% when running in interpreted mode on a > > Raspberry Pi 1, which is our reference low end platform. > > > > While we plan on investigating as much as possible on our side as well, I > > would like to ask, is a performance regression of this magnitude to be > > expected? Our configuration of SpiderMonkey, HTML application, and > > bindings code are all held about as constant as they can be. If yes, then > > are there any high ROI configuration (or even code) changes that we can > > make in order to best mitigate this, and if no, then in what areas should > > we begin looking into first? > > > > Thanks, > > > > -Nathan > > _______________________________________________ > > 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 > >
Hello David, Thanks for being able to look into this. In the drive folder below is profiling data (out.perf) from running the perf tool (http://www.brendangregg.com/perf.html) for 10 seconds while vertically scrolling on youtube.com/tv, as well as a flame graph (http://www.brendangregg.com/flamegraphs.html) generated directly from out.perf (graph.svg), and a flame graph filtered to isolate JavaScript (jsonly.svg). https://drive.google.com/open?id=0BxoS5eVaXrQJXzFhTXM0Q2lURWc Thanks, -Nathan _______________________________________________ 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
