Firefox/Projects/Startup Time Improvements/joelr notes: Difference between revisions

Firefox/Projects/Startup Time Improvements/joelr notes (view source)

956 bytes added , 27 August 2009

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 === August 27, 2009 ===
 The dyld shared cache lives in ''/var/db/dyld/''. The two files of interest are ''dyld_shared_cache_i386.map'' (for x86-32) and ''shared_region_roots/Applications.paths''. Both are regular text files. The former shows the contents of the shared cache for the i386 architecture and the latter is what ''update_dyld_shared_cache'' inspects.
+There's no prebinding on newer versions of Mac OSX and the dyld shared cache is
+automatically updated as needed. Tracing Safari disk activity during startup
+reveals that basically all its dynamic libraries are pulled from the dyld
+shared cache.
+It's possible to add Firefox (''.../Firefox.app/Contents/MacOS/firefox-bin'') to
+Applications.paths and the change will be kept across reboots. Unfortunately,
+only a handful of libraries that Firefox uses are pulled into the cache by
+update_dyld_shared_cache. I'm speculating that this may have something to do
+with @executable_path/XUL and friends (otool -L .../firefox-bin).
+Safari uses absolute paths to frameworks in ''/System/Library/Frameworks'' so I
+speculate that relative paths are what is preventing XUL and others from going
+into the cache. We may want to investigate
+''/System/Library/Frameworks/Firefox.framework'' or similar.
+[https://bugzilla.mozilla.org/show_bug.cgi?id=513076 Bug 513076].
 = Previous statuses =