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Firefox/Projects/Startup Time Improvements/joelr notes: Difference between revisions
Firefox/Projects/Startup Time Improvements/joelr notes (view source)
Revision as of 18:31, 26 August 2009
, 26 August 2009→August 26, 2009
Joel Reymont (talk | contribs) |
Joel Reymont (talk | contribs) |
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We already know that Firefox is slow to start up but this type of sampling neatly points the finger in the right direction. Props to Brendan Gregg for teaching me how to fish! | We already know that Firefox is slow to start up but this type of sampling neatly points the finger in the right direction. Props to Brendan Gregg for teaching me how to fish! | ||
What kind of IO does Firefox do upon startup, though? I find the output from ''iosnoop'' a bit confusing so I whipped up [http://github.com/wagerlabs/firefox-startup/blob/7b78d70584bf9783d203e46786cbe800be4f5ba6/io.d a version of my own] that prints just disk access times, disk operation deltas, block size and file name accessed. | |||
The script samples Firefox during the first 20 seconds of its life and the [http://pastie.org/595737 output from ''./cold.sh io.d''] looks like this: | |||
<pre> | |||
DELTA DTIME D SIZE PATHNAME | |||
1399 1407 R 4096 ??/dtrace/libdtrace_dyld.dylib | |||
1141 1145 R 8192 ??/dtrace/libdtrace_dyld.dylib | |||
1301 1305 R 4096 ??/MacOS/XUL | |||
1701 1705 R 4096 ??/MacOS/XUL | |||
11081 685 R 4096 ??/MacOS/libmozjs.dylib | |||
1989 2253 R 36864 ??/MacOS/libmozjs.dylib | |||
1768 1894 R 24576 ??/MacOS/libmozjs.dylib | |||
27111 2135 R 200704 ??/MacOS/XUL | |||
1411 1134 R 8192 ??/MacOS/libxpcom.dylib | |||
1784 1968 R 4096 ??/MacOS/libplds4.dylib | |||
2383 464 R 4096 ??/MacOS/libxpcom.dylib | |||
2886 456 R 4096 ??/MacOS/libxpcom.dylib | |||
1431 732 R 4096 ??/MacOS/libplds4.dylib | |||
2640 706 R 4096 ??/MacOS/libnspr4.dylib | |||
3092 484 R 4096 ??/MacOS/libnspr4.dylib | |||
... | |||
</pre> | |||
I also have [http://github.com/wagerlabs/firefox-startup/blob/7b78d70584bf9783d203e46786cbe800be4f5ba6/iosum.d a version that rolls disk operations by file name and read/write op]. It also samples during 20 seconds and [http://pastie.org/595727 outputs something like this]: | |||
<pre> | |||
DELTA DTIME SIZE D PATHNAME | |||
307 311 4096 R ??/en_US.ISO8859-1/LC_TIME | |||
437 441 4096 R ??/pref/firefox-branding.js | |||
439 443 4096 R ??/su3x40q6.2/extensions.cache | |||
441 445 4096 R ??/en_US.ISO8859-1/LC_NUMERIC | |||
640 644 4096 R ??/en_US.ISO8859-1/LC_MONETARY | |||
643 648 4096 R ??/chrome/browser.manifest | |||
644 650 4096 R ??/la_LN.US-ASCII/LC_COLLATE | |||
645 650 4096 R ??/Firefox/profiles.ini | |||
646 650 4096 R ??/chrome/en-US.manifest | |||
... | |||
</pre> | |||
Moving on... | |||
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