On 03/30/2017 02:43 AM, Matus UHLAR - fantomas wrote:
On 03/20/2017 10:15 AM, Matus UHLAR - fantomas wrote:
Well, I personally will still be curious how much does SMP affect the
case of one worker and one or more diskers...
On 20.03.17 12:19, Alex Rousskov wrote:
I do not understand why you are asking this question in AUFS context.
AUFS does not use diskers!
because it's diskers (rock store) who switch to SMP mode when "workers
1" is used, and this may cause troubles to *ufs.
Diskers do not cause trouble -- they are doing exactly what they have
been designed to do. It is ufs (being SMP-unaware) that causes trouble
in SMP mode when admins enable ufs-based cache_dirs in SMP configurations.
Diskers primary function is low-level disk cache I/O. Like all kids,
diskers respond to cache manager requests and Squid management events
(e.g. shutdown and reconfiguration). IIRC, diskers also build in-RAM
cache_dir index.
http://wiki.squid-cache.org/Features/SmpScale#Terminology
their own or also the shared one?
Their own, which is shared among all workers. In many contexts, one can
view the set of all disk-specific shared indexes as one big shared disk
index. Please note that my recollection that diskers build the in-RAM
cache_dir index may be wrong -- this behavior may have changed, and I
have not checked the code or commit logs. It would certainly make sense
for diskers to build their indexes, but I do not remember whether we
have implemented that optimization.
HTH,
Alex.
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