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SuperSize

SuperSize is comprised of two parts:

  1. A command-line tool for creating and inspecting .size and .sizediff files,
  2. A web app for visualizing .size and .sizediff files.

For more details, see //tools/binary_size/libsupersize/docs.

[TOC]

Why SuperSize?

Chrome on Android needs to be as lean as possible. Having a tool that can show why binary grows & shrinks helps keep it lean.

The android-binary-size trybot uses SuperSize to show an APK Breakdown on every Chromium code review.

SuperSize is also used when creating milestone size reports (Googlers only).

Is SuperSize a Generic Tool?

No. It works only for binaries built using Chrome's custom build system. E.g.:

  • It assumes .ninja build rules are available.
  • It uses heuristic for locating .so given .apk.
  • It requires the size-info build directory to analyze .pak and .dex files.

SuperSize Usage

supersize archive

Collect size information into a .size file.

*** note Note: Refer to diagnose_bloat.py for list of GN args to build a release binary (or just use the tool with --single).

Example Usage:

# Android:
autoninja -C out/Release chrome_public_apk
tools/binary_size/supersize archive chrome.size -f out/Release/apks/ChromePublic.apk -v

# Linux:
autoninja -C out/Release chrome
tools/binary_size/supersize archive chrome.size -f out/Release/chrome -v

supersize console

Starts a Python interpreter where you can run custom queries, or run pre-made queries from canned_queries.py.

Example Usage:

# Prints size information and exits (does not enter interactive mode).
tools/binary_size/supersize console chrome.size --query='Print(size_info)'

# Enters a Python REPL (it will print more guidance).
tools/binary_size/supersize console chrome.size

Example Session:

>>> ShowExamples()  # Get some inspiration.
...
>>> sorted = size_info.symbols.WhereInSection('t').Sorted()
>>> Print(sorted)  # Have a look at the largest symbols.
...
>>> sym = sorted.WhereNameMatches('TrellisQuantizeBlock')[0]
>>> Disassemble(sym)  # Time to learn assembly.
...
>>> help(canned_queries)
...
>>> Print(canned_queries.TemplatesByName(depth=-1))
...
>>> syms = size_info.symbols.WherePathMatches(r'skia').Sorted()
>>> Print(syms, verbose=True)  # Show full symbol names with parameter types.
...
>>> # Dump all string literals from skia files to "strings.txt".
>>> Print((t[1] for t in ReadStringLiterals(syms)), to_file='strings.txt')

supersize save_diff

Creates a .sizediff file given two .size files. A .sizediff file contains two .size files, with all unchanged symbols removed.

Example Usage:

tools/binary_size/supersize save_diff before.size after.size out.sizediff

supersize diff

A convenience command equivalent to: console before.size after.size --query='Print(Diff(size_info1, size_info2))'

Example Usage:

tools/binary_size/supersize diff before.size after.size --all

Sharing .size(diff) Files

There is a GCS bucket available for Googlers to share SuperSize files (requires a one-time gsutil.py config to login).

To share publicly:

FILENAME=descriptive_name.sizediff
gsutil.py cp -a public-read "$FILENAME" gs://chrome-supersize/oneoffs/$USER/
echo "Share via: https://chrome-supersize.firebaseapp.com/viewer.html?load_url=https://storage.googleapis.com/chrome-supersize/oneoffs/$USER/$(basename $FILENAME)"

To share to Googlers only:

FILENAME=descriptive_name.sizediff
gsutil.py cp "$FILENAME" gs://chrome-supersize/private-oneoffs/$USER/
echo "Share via: https://chrome-supersize.firebaseapp.com/viewer.html?load_url=https://storage.googleapis.com/chrome-supersize/private-oneoffs/$USER/$(basename $FILENAME)"

To delete a file you uploaded by mistake:

gsutil.py rm gs://chrome-supersize/oneoffs/$USER/filename