Varnish, long lived cache and purge on change
phk at phk.freebsd.dk
Wed Aug 19 17:51:26 CEST 2009
In message <4A8BB076.50009 at gmail.com>, Rob S writes:
>phk and other deep Varnish developers,
>Do you think it'd ever be viable to have a sort of process that goes
>through the tail of the purge queue and applies the purges then deletes
>them from the queue? If so, how much work would it be to implement?
Right now we do not know which objects hold onto a ban, only the
number of objects that do.
Do implement it, we would need to put a linked list in each ban
and wire the referencing objects onto it.
My only worry is that it adds a linked list to the objcore structure
taking it from 88 to 104 bytes.
I seem to recall that the locking is benign.
Probably the more interesting question is how aggressive you want it to
be: if it is too militant, it will cause a lot of needless disk activity.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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