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= Description = | = Description = | ||
Firefox comes with DTrace probe points that can be used to profile Javascript processes. Want to profile memory, time, etc. on your Javascript, using Fedora 12? This page will show you how. | Firefox comes with DTrace probe points that can be used to profile Javascript processes. Want to profile memory, time, etc. on your Javascript, using Fedora 12? This page will show you how. If you need help, feel free to post on [[User_talk:Valce]]! | ||
= Requirements = | = Requirements = | ||
* | *[https://developer.mozilla.org/En/Developer_Guide/Source_Code/Mercurial Firefox source -- choose your version] | ||
*[[SystemTap]] | *[[SystemTap]] | ||
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Example: | Example: | ||
Using the following | Using the following [[File:Javascript.stp]] on the 'more complicated example' found [https://developer.mozilla.org/en/drawing_graphics_with_canvas here], we get: | ||
File | Function | Time(ms) | Called | |||
-------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | ||
...me/valce/Desktop/draw.html | dot | 0 | 4 | |||
...me/valce/Desktop/draw.html | drawBowtie | 1 | 4 | |||
...me/valce/Desktop/draw.html | onload | 7 | 1 | |||
...me/valce/Desktop/draw.html | draw | 6 | 1 | |||
This basic script just shows the file name, function, time and the number of times called. Argument 2 in the script allows a basic file name filter which will prevent the program from picking up unrelated Javascript function calls. | |||
Latest revision as of 17:10, 16 December 2009
Description
Firefox comes with DTrace probe points that can be used to profile Javascript processes. Want to profile memory, time, etc. on your Javascript, using Fedora 12? This page will show you how. If you need help, feel free to post on User_talk:Valce!
Requirements
Setup
- Download Firefox source from the above link.
- Create a ~/.mozconfig and fill it as follows (Gently adapted from [| Uxebu])
. $topsrcdir/browser/config/mozconfig mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/obj-ff ac_add_options --enable-debug --disable-optimize ac_add_options --enable-shared --disable-static --enable-dtrace mk_add_options MOZ_MAKE_FLAGS="-s -j4" mk_add_options AUTOCONF="autoconf-2.13"
- Install autoconf 2.13 (
yum install autoconf213) - Enter the mozilla directory and run
make -f client.mk build
Playing
The libmozjs can be found in (source directory)firefox/obj-ff/dist/lib/libmozjs.so, and the binary is located at (source directory)firefox/obj-ff/dist/bin/firefox. To see a list of all available markers, run stap -l 'process("/path/to/libmozjs.so").mark("*")
Example:
Using the following File:Javascript.stp on the 'more complicated example' found here, we get:
File | Function | Time(ms) | Called
--------------------------------------------------------------------------------------
...me/valce/Desktop/draw.html | dot | 0 | 4
...me/valce/Desktop/draw.html | drawBowtie | 1 | 4
...me/valce/Desktop/draw.html | onload | 7 | 1
...me/valce/Desktop/draw.html | draw | 6 | 1
This basic script just shows the file name, function, time and the number of times called. Argument 2 in the script allows a basic file name filter which will prevent the program from picking up unrelated Javascript function calls.