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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 22:09, 25 August 2009
, 25 August 2009no edit summary
Joel Reymont (talk | contribs) |
Joel Reymont (talk | contribs) No edit summary |
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Created a [http://github.com/wagerlabs/firefox-startup/blob/c0b7691c60eb0455d7475aa17777edcf3ed3d605/main-entry-probe.patch static probe that fires first thing in XRE_main] and updated my [http://github.com/wagerlabs/firefox-startup/tree/master DTrace scripts] to use it. | Created a [http://github.com/wagerlabs/firefox-startup/blob/c0b7691c60eb0455d7475aa17777edcf3ed3d605/main-entry-probe.patch static probe that fires first thing in XRE_main] and updated my [http://github.com/wagerlabs/firefox-startup/tree/master DTrace scripts] to use it. | ||
pid$target::function:entry probes are very slow since | ''pid$target::function:entry'' probes are very slow since DTrace may have to search thousands of functions. All that search time skews elapsed time reported by ''timestamp''. USDT (static) probes are just a few NOP instructions in the code that get fixed up by DTrace as needed so they work much faster. | ||
= Previous statuses = | = Previous statuses = | ||
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sudo ./cold.sh static-init.d | sudo ./cold.sh static-init.d | ||
</pre> | </pre> | ||
= DTrace tips and tricks = | = DTrace tips and tricks = | ||