On 08/24/2016 11:56 PM, 曹士超 wrote:
> I don`t know squid use smp , multi cpu process purge cache, each
> process define cache_dir ,when purge cache Choose a different
> worker,Lead to clear the cache fails
Hello,
Due to the language barrier, I am not sure what question you are
asking, but I hope that the following facts give you enough information
to find the right answer:
The two SMP-aware caches are rock cache_dir and shared memory cache. All
ufs-based cache_dirs and local memory cache are SMP-unaware. Shared
memory caching is enabled by default when you use multiple workers.
SMP caching is supported only when all your caches are SMP-aware. With
SMP-aware caches all Squid workers should share the same set of caches.
If you do not use SMP-aware caches, use a mixture of SMP-aware and
SMP-unaware caches, or give different workers a different set of
SMP-aware caches, then many caching-related things will fail to work in
SMP mode (often without warnings or error messages). I am ignoring all
those problematic cases in the text below!
When receiving a DELETE transaction or otherwise purging a cached
response, Squid must delete all copies of that response from all caches.
This protocol requirement applies to SMP and non-SMP Squid alike, of course.
There is a known Squid bug that leads to some copies of a being-purged
response not deleted in SMP Squids. Factory is working on a patch to fix
that protocol violation (with the exception of one corner case that goes
beyond purging itself). Our fix is almost ready, and I hope to see the
corresponding patch posted to squid-dev soon.
HTH,
Alex.
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