This adds a few basic tests for expectations of when we do and don't
restyle, construct frames, and reflow in response to changes of media
queries. They don't give us a lot of coverage, but often the tiny bits
of coverage at the beginning are the most useful.
In general, I'd like us to have more tests for specific optimizations,
i.e., for specific things that we expect not to happen in certain cases.
The elementsRestyled, framesConstructed, and framesReflowed getters on
DOMWindowUtils are a good way to make such measurements for a number of
things in layout; that's why I added them.
(Inspired a bit by bug 1259641.)
MozReview-Commit-ID: JFtlPO1eyoD
This is useful for writing tests that test particular optimizations,
such as that a particular operation doesn't cause restyles. It sits
next to similar counters for frames constructed and frames reflowed.
I also snuck in a preference for the less-expensive mPresContext over
the more expensive mFrame->PresContext() (which dereferences multiple
pointers).
(Originally written for work I planned to be part of bug 1189598.)
MozReview-Commit-ID: 8PN7nwLJG9r
This adds support for #rgba and #rrggbbaa colors to CSS. This feature
is specified in https://drafts.csswg.org/css-color-4/#hex-notation .
This adds new types to nsCSSValue so that we can serialize the syntax
that was specified, as we do for other distinctions in how colors are
specified.
It does not change the behavior of the hashless color quirk, which
continues to support only 3 and 6 digit colors as specified in
https://quirks.spec.whatwg.org/#the-hashless-hex-color-quirk (step 4).
This changes property_database.js to remove various uses of 4 and 8
digit colors as invalid values. It then adds them in slightly fewer
places as valid values, but more thoroughly testing both initial and
non-initial values on 'color'.
It marks two canvas tests explicitly testing this feature as no longer
known to fail by removing their .ini files.
Finally, it adjusts the web platform test testing the hashless color
quirk to no longer treat 4 and 8 digit colors with hashes as invalid
values. Removing the relevant test items seems like the right thing
since they're in a section where 3 and 6 digit colors were skipped but
other lengths were tested. Modifying this imported test is OK since:
<jgraham> dbaron: Commit the change you want to m-c, it is
(semi-)automatically upstreamed every so often (typically
about once a week)
MozReview-Commit-ID: IFq4HxaRkil
This patch tells all callers to use the existing behavior, so it is
intended not to change behavior. Callers that will be modified in later
patches are marked with "FIXME" comments that will be removed in those
later patches (patches 3 and 4).
MozReview-Commit-ID: FaLryfxaeHv
It was a cold Friday night in San Francisco. Earlier in the day, I
informed Chris AtLee that I was going to start focusing on improving
the efficiency of Firefox automation and asked him where the biggest
capacity issues were. He said "we're hurting most on Windows tests."
As I was casually drinking a barleywine (note to reader: barleywines
are serious beers - there's nothing casual about them), I found myself
tediously clicking through Treeherder looking at logs for Windows jobs,
looking for patterns and other oddities. As I was clicking through,
something stood out to me: the sheer number of reftest jobs. I
recalled a random project I started a few years ago. Its aim was to
analyze buildbot job metadata so we could better understand where time
was spent in automation. I had mostly written off the side project as
a failure and a near complete waste of my time. Not even a stray
random thought of this project had entered my mind in the past year.
But clicking through Treeherder after a few glasses of barleywine
somehow reminded me of one of the few useful findings of that project:
reftest jobs consumed a seemingly disproportiate amount of machine time,
something like 35 or 40% IIRC of the time spent on all jobs.
Now, this finding was several years ago and almost certainly no longer
relevant. But, again, I had a few glasses of barleywine in me and was
bothered by the amount of reftest jobs and their duration, so I thought
"hey, why don't I run reftests and see why they take so long." So I
built Firefox on Windows - the platform Chris AtLee said we're "hurting
most on."
I decided to start my very casual profiling session by recording a
`mach reftest` run using Sysinternals Process Monitor. To my surprise,
it yielded a very obvious and unexpected result: the Places SQLite
database was incurring a lot of I/O. On my i7-6700K Windows 10 desktop
with a high performance SSD, `mach reftest` yielded the following:
File Time #Events #Reads #Writes RBytes WBytes Path
198s 980,872 243,270 669,231 7,971,471,360 20,667,084,080 places.sqlite-wal
165s 645,853 222,407 367,775 7,287,701,820 14.071,529,472 places.sqlite
2s 377,121 1 0 32,768 0 places.sqlite-shm
The Places SQLite database accounts for 2,003,846 of the total of
3,547,527 system calls (56.49%) recorded by procmon during `mach
reftest` execution. This represents a staggering 49,997,786,732 of the
50,307,660,589 (99.38%) bytes of I/O recorded! Yes, that's 50 GB.
I reckon the reason the Places database accumulates so much I/O load
during reftests is because the reftest suite essentially loads thousands
of pages as quickly as possible. This effectively performs a stress
test against the Places history recording service.
As effective as reftests are at stress-testing Places, it adds no value
to reftests because reftests are testing the layout features, not the
performance of history recording. So these 2M system calls and 50 GB
of I/O are overhead.
This commit disables Places when executing reftests and prevents
the overhead.
After this commit, `mach reftest` has significantly reduced interaction
with the Places SQLite database:
File Time #Events #Reads #Writes RBytes WBytes Path
0.09s 502 138 302 4,521,984 8,961,528 places.sqlite-wal
0.07s 254 20 140 524,604 8,126,464 places.sqlite
0.01s 3,289 1 0 32,768 0 places.sqlite-shm
Of the 948,033 system calls recorded with this change (26.7% of
original), 691,322 were related to I/O. The Places SQLite database
only consumed ~22MB of I/O, <0.01% of original. It's worth noting that
~half of the remaining I/O system calls are related to reftest.log,
which now accounts for the largest percentage of write I/O (only
~53 MB, however). It's worth noting that reftest.log appears to be
using unbuffered writes and is requiring an excessive amount of
system calls for writing. But that's for another bug and commit.
In terms of wall time, the drastic I/O reduction during `mach reftest`
appears to have minimal impact on my machine: maybe 30s shaved from a
~900s execution, or ~3%. But my machine with its modern SSD doesn't
struggle with I/O.
In automation, it is a different story.
I pushed this change to Try along with the base revision and triggered
4 runs of most reftest jobs. The runtime improvements in automation
are impressive. Here are the fastest reported times for various jobs:
Job Before After Delta
Linux Opt R1 31m 34m +3m
Linux Opt R2 43m 35m -8m
Linux Opt Ru1 40m 34m -6m
Linux Opt Ru2 43m 37m -6m
Linux Opt R E10s 89m 72m -17m
Linux Debug R1 52m 40m -12m
Linux Debug R2 49m 42m -7m
Linux Debug R3 60m 51m -9m
Linux Debug R4 42m 37m -5m
Linux Debug R1 E10s 84m 72m -12m
Linux Debug R2 E10s 97m 85m -12m
Linux64 Opt R1 35m 24m -11m
Linux64 Opt R2 37m 26m -11m
Linux64 Opt Ru1 32m 29m -3m
Linux64 Opt Ru2 37m 26m -12m
Linux64 Opt TC R1 12m 10m -2m
Linux64 Opt TC R2 10m 7m -3m
Linux64 Opt TC R3 11m 9m -2m
Linux64 Opt TC R4 11m 9m -2m
Linux64 Opt TC R5 13m 11m -2m
Linux64 Opt TC R6 11m 9m -2m
Linux64 Opt TC R7 9m 8m -1m
Linux64 Opt TC R8 11m 10m -1m
Linux64 Opt TC Ru1 30m 25m -5m
Linux64 Opt TC Ru2 36m 27m -11m
OS X 10.10 Opt 31m 27m -4m
OS X 10.10 Opt E10s 26m 25m -1m
OS X 10.10 Debug 68m 55m -13m
Win7 Opt R 30m 28m -2m
Win7 Opt Ru 28m 26m -2m
Win7 Opt R E10S 29m 27m -2m
Win7 Debug R 85m 76m -9m
Win7 Debug R E10S 75m 65m -10m
Win8 x64 Opt R 29m 26m -3m
Win8 x64 Opt Ru 27m 25m -2m
Win8 x64 Debug R 90m 71m -19m
Android 4.3 API15 Opt R1 89m 71m -18m
Android 4.3 API15 Opt R2 78m 64m -14m
Android 4.3 API15 Opt R3 75m 64m -11m
Android 4.3 API15 Opt R4 74m 68m -6m
Android 4.3 API15 Opt R5 75m 69m -6m
Android 4.3 API15 Opt R6 91m 86m -5m
Android 4.3 API15 Opt R7 87m 66m -21m
Android 4.3 API15 Opt R8 87m 82m -5m
Android 4.3 API15 Opt R9 80m 66m -14m
Android 4.3 API15 Opt R10 80m 67m -13m
Android 4.3 API15 Opt R11 73m 66m -7m
Android 4.3 API15 Opt R12 105m 91m -14m
Android 4.3 API15 Opt R13 72m 59m -13m
Android 4.3 API15 Opt R14 82m 61m -21m
Android 4.3 API15 Opt R15 73m 62m -11m
Android 4.3 API15 Opt R16 79m 78m -1m
The savings total 6+ *hours* or ~15% when running all reftests. I'd
say this isn't bad for a one-line code change!
MozReview-Commit-ID: H1LkACgSpVn
--HG--
extra : rebase_source : 891a5ce8e1f6c3d70fc646f116c2f49f897ad735
