Catapult (Chrome tracing) has a hard upper limit of 256 MB of JSON data.
This is independent of the number of events, because V8 can't store a
single string longer than that. Before these changes, longer traces
(eg all GL GMs, which was my test case) would be much larger (306 MB).
This CL includes four changes that help to reduce the text size:
1) Offset timestamps (saved 7.3 MB)
2) Limit timestamps and durations to 3 digits (saved 10.7 MB)
3) Shorten thread IDs (saved 7.2 MB)
4) Omit categories from JSON (saved 25.7 MB)
Note that category filtering still works, this just prevents us from
writing the categories to the JSON, which was of limited value.
At this point, my 306 MB file is now 255.3 MB, and loads.
Bug: skia:
Change-Id: Iaafc84025ddd52904f1ce9c1c2e9cbca65113079
Reviewed-on: https://skia-review.googlesource.com/35523
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Removes the need for strdup with copied strings, paves the way for
more (and richer) payload, and shrinks the average event way down.
Bug: skia:
Change-Id: I9604fe713c34cfc877dce84563af89c579abd65b
Reviewed-on: https://skia-review.googlesource.com/35166
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
This is a stand-alone helper class for writing properly
structured JSON to an SkWStream. It currently solves two
problems (although this CL only uses it in one context):
1) Performance. Writing out JSON this way is about 10x
faster than using JSONCPP. For the large amounts of data
generated by the tracing system, that's a big win.
2) Makes it easy to emit structured JSON from code that's
not fully centralized. We'd like to spit out JSON that
describes a GrContext, GrGpu, GrCaps, etc... Doing that
with simple string manipulation is complex, and spreads
this logic over all those functions. Using JSONCPP adds
yet another (large) third party library dependency (that
we only build into our own tools right now).
This went through several revisions. I originally planned
it as a stateful SkString wrapper, so the user could just
build their JSON as a string. That's O(N^2), though,
because SkString grows by a (small) constant amount. Even
using a better growth strategy still means needing RAM
for all the resulting text, which is usually pointless.
This version has a constant memory cost, so writing huge
amounts of JSON to disk (tracing a long DM run can emit
100's of MBs) doesn't stress resources.
Bug: skia:
Change-Id: Ia716524b246db0f97d332da60d2ce9903069e748
Reviewed-on: https://skia-review.googlesource.com/31204
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
- Bring back some previously deleted macros and helper types.
- Automatically inject base_type information into snapshot events,
to allow simpler tracking of polymorphic object types.
- Fix JSON formatting of pointer values (they were serializing as bool).
Bug: skia:
Change-Id: Iac7803f72ce5396ffd2fbcb5a36d76745c5e3f3e
Reviewed-on: https://skia-review.googlesource.com/28220
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Bug: skia:
Change-Id: I401c5a9885c348aa424ab07b094acecddb209490
Reviewed-on: https://skia-review.googlesource.com/25860
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Bug: skia:
Change-Id: I4d0bdb9d954e49b79ace0552d7b74b36a512c00d
Reviewed-on: https://skia-review.googlesource.com/25642
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Not yet thread safe (so it forces threading off).
Builds JSON on the fly, so overhead is certainly bad.
Plan to fix all of that, but this at least "works".
There is now one tracing flag: 'trace'.
- 'debugf' installs the SkDebugf tracer.
- 'atrace' installs the Android ATrace tracer.
- Any other value is interpreted as a filename, and
produces a JSON file for chrome://tracing.
All three modes work in DM, nanobench, and Viewer.
Bug: skia:
Change-Id: I3fbc22382b99418a508c670be2770195c0a1c364
Reviewed-on: https://skia-review.googlesource.com/24781
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
