710246 - Investigate substantial increase in libxul size since Gecko 10

Status: RESOLVED FIXED

(Core :: General, defect)

Description

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

Firefox 9b5: xul.dll is 15,719 KB
Firefox 10.0a2: xul.dll is 15,724 KB
Firefox 11.0a1 (12/13): xul.dll is 16,115 KB

Comment 1

[Mike Hommey [:glandium]]

This applies to linux i686 as well, so it most probably is cross platform.
Firefox 9.0b5: libxul.so is 22,082,596 B
Firefox 10.0a2: libxul.so is 22,231,412 B
Firefox 11.0a1: libxul.so is 22,587,112 B

(and FWIW, Firefox 8.0's is 21,545,036 B)

Comment 2

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

The difference between 8 and 9 is probably TI, but I can't think of anything we've landed in this cycle that's big ...

Comment 3

[Mike Hommey [:glandium]]

Attachment: map.py

Here is a script that I wrote a while ago that could be helpful to identify where code size comes from. It takes as input a map file as GNU ld outputs them. You need to add -Wl,-Map,/some/file to the libxul.so link command line, and then run the script against that file. It will output size per section per file with the format "section(file) size" for .text, .data* and .rodata sections. File names are relative to objdir/toolkit/library. What I wanted to do with this output is to create an interactive treemap, but I never found the time.

Comment 4

[Ed Morley [:emorley]]

Attachment: xul.dll filesizes since 1st Nov

CSV of xul.dll filesizes for each mozilla-central win32 nightly since 1st Nov.

Would appear the main increase is:
2011-11-17-03-09-39 -> 2011-11-18-03-10-05
...which added 284KB bytes (the next highest increase is only 32KB).

This equates to:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=30161b298513&tochange=447556784745

Comment 5

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

Ah, Skia.