[squid-users] squid workers question

[Matus UHLAR - fantomas]

On 10.03.17 08:52, Alex Rousskov wrote:
>Sorry, but that 2010 documentation is outdated. It was written before
>Rock store, a 2011 feature that changed what "SMP mode" means. This is
>my fault. Here is a replacement draft that I was working on until wiki
>went down:
>
>> NAME: workers
>> DEFAULT: 1
>> 	Number of main Squid processes or "workers" to fork and maintain.
>>
>> 	In a typical setup, each worker listens on all http_port(s) and
>> 	proxies requests without talking to other workers. Depending on
>> 	configuration, other Squid processes (e.g., rock store "diskers")
>> 	may also participate in request processing. All such Squid processes
>> 	are collectively called "kids".
>>
>> 	Setting workers to 0 disables kids creation and is similar to
>> 	running "squid -N ...". A positive value starts that many workers.

The default of 1 (only) creates kids for each rock store configured.

>> 	When multiple concurrent kids are in use, Squid is said to work in
>> 	"SMP mode". Some Squid features (e.g., ufs-based cache_dirs) are not
>> 	SMP-aware and should not or cannot be used in SMP mode.
>>
>> 	See http://wiki.squid-cache.org/Features/SmpScale for details.

very nice, thanks. However this is not meant for the wiki, but for:
http://www.squid-cache.org/Doc/config/workers/

maybe that pages could be updated (all but 3.2 versions are the same).


>The final version will probably move and extend the terminology-related
>text to the SMP section preamble -- it is kind of wrong to talk about
>diskers when documenting workers. Improvements and constructive
>suggestions welcomed!

compared to current version I'd change it to:

	1: start one main Squid process daemon (default)
            "no SMP" when rock store is not used
            "SMP" when rock store in use

>> so, with "workers 1", both aufs and rock should work properly, with rock
>> using separate process, correct?
>
>There are several ways to interpret your question, but the most likely
>interpretation leads to the "incorrect" answer: Without -N, a
>combination of "workers 1" and at least one "cache_dir rock" enables
>SMP. Do not use ufs-based cache_dirs in SMP mode.

That explains it. thanks.


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