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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 22:10, 25 August 2009
, 25 August 2009no edit summary
Joel Reymont (talk | contribs) No edit summary |
Joel Reymont (talk | contribs) No edit summary |
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= DTrace tips and tricks = | = DTrace tips and tricks = | ||
=== | === timestamp vs vtimestamp === | ||
''vtimestamp'' measures CPU time of the current thread, excluding IO and DTrace overhead. ''timestamp'' can still be used for deltas but the goal is to use as few pid$target probes as possible as they affect ''timestamp'' when dtrace has to switch between kernel and userland. io and syscall providers are fast and run in the kernel. | ''vtimestamp'' measures CPU time of the current thread, excluding IO and DTrace overhead. ''timestamp'' can still be used for deltas but the goal is to use as few pid$target probes as possible as they affect ''timestamp'' when dtrace has to switch between kernel and userland. io and syscall providers are fast and run in the kernel. | ||
=== | === Invalid address === | ||
Have you seen this kind of error before? | Have you seen this kind of error before? | ||