Bug 111389 – Add PerformanceTest for document startup via iframe append/remove

• Component: New Bugs
• Status: RESOLVED FIXED

[Eric Seidel (no email)]

Add PerformanceTest for document startup via iframe append/remove

[Eric Seidel (no email)]

Created attachment 191367 [details]
Patch

[Eric Seidel (no email)]

The poor performance of our iframe startup is the root cause behind the timeouts in bug 110876.

[Kentaro Hara]

Comment on attachment 191367 [details]
Patch

Looks good!

[Kentaro Hara]

Is someone working on improving the performance?

[Eric Seidel (no email)]

%run-perf-tests DOM/iframe-append-remove.html --chromium --release         [/src/WebKit/PerformanceTests]

Running 1 tests
Running DOM/iframe-append-remove.html (1 of 1)
DESCRIPTION: This benchmark tests adding/removing an iframe from the DOM
RESULT DOM: iframe-append-remove: Runs= 69.4810809919 runs/s
median= 69.4740711458 runs/s, stdev= 1.9264792407 runs/s, min= 65.68248037 runs/s, max= 74.5266625482 runs/s
RESULT DOM: iframe-append-remove: JSHeap= 55972944.8 bytes
median= 56490824.0 bytes, stdev= 3181796.3693 bytes, min= 46464360.0 bytes, max= 58860160.0 bytes
RESULT DOM: iframe-append-remove: Malloc= 0.0 bytes
median= 0.0 bytes, stdev= 0.0 bytes, min= 0.0 bytes, max= 0.0 bytes
Finished: 23.599536 s

%run-perf-tests DOM/iframe-append-remove.html --chromium --debug           [/src/WebKit/PerformanceTests]
Running 1 tests
Running DOM/iframe-append-remove.html (1 of 1)
DESCRIPTION: This benchmark tests adding/removing an iframe from the DOM
RESULT DOM: iframe-append-remove: Runs= 4.77791539633 runs/s
median= 4.75796009956 runs/s, stdev= 0.0924369707694 runs/s, min= 4.58572029651 runs/s, max= 4.91179038154 runs/s
RESULT DOM: iframe-append-remove: JSHeap= 9151589.2 bytes
median= 9546816.0 bytes, stdev= 892193.548796 bytes, min= 7730712.0 bytes, max= 10387696.0 bytes
RESULT DOM: iframe-append-remove: Malloc= 0.0 bytes
median= 0.0 bytes, stdev= 0.0 bytes, min= 0.0 bytes, max= 0.0 bytes
Finished: 33.710775 s

Note the values of interest:

Release:
RESULT DOM: iframe-append-remove: Runs= 69.4810809919 runs/s
Debug:
RESULT DOM: iframe-append-remove: Runs= 4.77791539633 runs/s

run-perf-tests is found at WebKit/Tools/Scripts/run-perf-tests

[Ryosuke Niwa]

Comment on attachment 191367 [details]
Patch

Please don't add new tests to DOM. This directory should only contain tests imported from chromium's dom_perf test. We should probably rename it to something else and add DOM directory instead.

[Eric Seidel (no email)]

(In reply to comment #4)
> Is someone working on improving the performance?

Not to my knowledge.  This came to my attention due to bug 110876, which I investigated (thinking the parser was doing something wrong) and found that v8 startup was completely dominating the -data variants of the test.  Each -data test uses iframe.src="data:..." loads for the subtests.  There are hundreds of subtests in some tests.  Thus in debug, it's not surprising that we're timing out if each frame takes 1/5th of a second to load v8. :)

[Eric Seidel (no email)]

(In reply to comment #6)
> (From update of attachment 191367 [details])
> Please don't add new tests to DOM. This directory should only contain tests imported from chromium's dom_perf test. We should probably rename it to something else and add DOM directory instead.

That's absolutely ridiculous.  I added a README to warn future committers.  Please edit it to explain the situation.

[Eric Seidel (no email)]

Committed r144704: <http://trac.webkit.org/changeset/144704>

[Dan Carney]

(In reply to comment #4)
> Is someone working on improving the performance?

There's an effort to get more or less instant context startup in v8.  It will take some time to get there.

[Eric Seidel (no email)]

(In reply to comment #10)
> (In reply to comment #4)
> > Is someone working on improving the performance?
> 
> There's an effort to get more or less instant context startup in v8.  It will take some time to get there.

Currently it looks like it takes about 1000/70 = 14.2ms (nearly a full frame) on my ridiculous Linux desktop.

Glad to hear its on the plan. :)

[Adam Barth]

We should run this test on Android to see how long it takes there.

[Eric Seidel (no email)]

Agreed.  I'll be away from my linux desktop (and thus Android build) tomorrow, but perhaps one of the folks with CrAndroid WebKit checkouts might try:

run-perf-tests DOM/iframe-append-remove.html --chromium-android --release

and report back. :)

[Eric Seidel (no email)]

(In reply to comment #13)
> Agreed.  I'll be away from my linux desktop (and thus Android build) tomorrow, but perhaps one of the folks with CrAndroid WebKit checkouts might try:
> 
> run-perf-tests DOM/iframe-append-remove.html --chromium-android --release
> 
> and report back. :)

Sorry, that changed to Parser/iframe-append-remove.html.