[Fontconfig] performance issue questions

Akira TAGOH akira at tagoh.org
Mon Nov 28 03:57:58 UTC 2016

The former one was what I took measures for that. I expect it works as long
as the process is done within the most accurate time.

On Mon, Nov 28, 2016 at 11:32 AM, Keith Packard <keithp at keithp.com> wrote:

> Akira TAGOH <akira at tagoh.org> writes:
> > what if some processes is updating the same cache?
> > what if some processes are updating caches for additions during updating
> > caches for deletion? and so on. FWIW this isn't a paranoid. is examples
> > actually happened in the past.
> The code was designed so that the cache could be computed in parallel by
> many processes, but that some process would see the 'current' state of
> the system and write a correct cache file.
> I remain mystified as to why this doesn't actually work; is it file
> systems with coarse (1s) timestamps causing troubles? Or can someone
> construct a sequence of operations which cannot be satisfied by this
> process, even with arbitrarily precise timestamps?
> --
> -keith

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