[Fontconfig] Application startup performance
akira at tagoh.org
Fri Mar 11 10:16:57 UTC 2016
f44bfad2 could be reverted perhaps but need to test carefully before
doing that. unfortunately I don't have a time to do that so far.
On Fri, Mar 11, 2016 at 8:26 AM, Behdad Esfahbod <behdad at behdad.org> wrote:
> Any resolution here? Current master's behavior of stating all fonts is
> definitely very bad. Anyone volunteer to clean up the cache code a bit?
> On Mon, Jan 18, 2016 at 7:09 PM, Akira TAGOH <akira at tagoh.org> wrote:
>> On Mon, Jan 18, 2016 at 5:54 PM, Keith Packard <keithp at keithp.com> wrote:
>> > Akira TAGOH <akira at tagoh.org> writes:
>> >> Not exactly. fontconfig doesn't stat everey directory at runtime but
>> >> relies on the subdir list in the cache to traverse. so if it isn't
>> >> outdated and missing some, it won't be picked up by fontconfig.
>> > How can it "miss some" if it checks the timestamp of the parent before
>> > relying on the list?
>> Previously fontconfig only locks the file when writing out. the time
>> to write it out since bringing up fc-cache depends on the time of
>> collecting data and it takes more time if there are more targeted
>> files and directories. and likely to see a process finished first
>> which brought up later.
>> so I locked out between reading and writing to avoid it.
>> >> Not sure but perhaps it is. my memory is already vague and not sure if
>> >> it had a nano second in the mtime. so better testing anyway.
>> > Hrm. Is fontconfig even using the higher resolution time when the file
>> > system supports it?
>> Yes. well, very recently. not yet included in any releases.
>> Akira TAGOH
>> Fontconfig mailing list
>> Fontconfig at lists.freedesktop.org
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