Note that we have bug 990804 opened for providing such a service. Unfortunately, this bug is currently stalled because we apparently didn't have a clear idea of what API clients would need.
I'm willing to pick this for Q2, if there is interest. Cheers, David On 26/03/15 07:46, Randell Jesup wrote: > As a result of some conversations on IRC, it came to light that a bunch > of blocking IO operations were apparently moved off of MainThread > (presumably to avoid UI 'jank'), and instead Dispatched to > STREAMTRANSPORTSERVICE (aka STS thread). > > Some examples pointed out to me: FilePicker, the spell-checker, the > DeviceStorage DOM code, DOM cache code in Manager.cpp (via > BodyStartWriteStream()), even perhaps ResolvedCallback in > ServiceWorkers. (I haven't looked closely at all of the uses yet.) > > Good, right? No jank in the UI! No - now the jank is in the network > code! > > STS is the primary network thread, and blocking that without a Darn Good > Reason will cause all sorts of negative effects. Page loads, XHR, > WebSockets, WebRTC (which will react by adding delay to cover the > 'jitter' in apparent network RTT) and many other things will have > small-to-large negative impacts. > > Perhaps some of these listed above (and others) don't block or even have > a legitimate need to run on STS thread - ok, if so, comment as to why > it's ok/needed. Everyone else should not be using STS thread as a > convenient target.... > > It does point out that with the need to get a lot of blocking operations > off of MainThread, it would help other modules to have a single service > or ThreadPool for dumping such operations to. This would mean less > code, less incorrect/undone thread shutdowns/etc. Thoughts? (Perhaps > such a service could use LazyIdleThreads, which will shut themselves > down after inactivity.) > -- David Rajchenbach-Teller, PhD Performance Team, Mozilla
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