1813165 - Measure impact of Ion Off-thread compile latency

Status: RESOLVED FIXED

(Core :: JavaScript Engine, task, P1)

Comment 1

[Matthew Gaudet (he/him) [:mgaudet]]

Attachment: WIP: Bug 1813165 - Allow programatically slowing down an off-thread ion compilation

This patch adds a new environment variable JS_ION_SLEEP_MULTIPLIER, which is
used to sleep an off-thread Ion compilation before it returns for some fraction
of the time that compilation took (ie, if JS_ION_SLEEP_MULTIPLIER=0.1 and
compilation took 100us, we would sleep for 10us before releasing the off-thread
compilation.)

This is to be used measuring the sensitivity of our system to Ion off-thread
compilation time.

Comment 2

[Bryan Thrall [:bthrall]]

Attachment: WIP: Bug 1813165 - Use busy loop to extend Ion compile time

On Windows, std::this_thread::sleep_for() drastically hurts Speedometer
performance.

Comment 3

[Matthew Gaudet (he/him) [:mgaudet]]

I think we've learned what we wanted to from this bug.