Re: [squid-users] Choose one worker

On 28/08/2013 2:19 p.m., Alfredo Rezinovsky wrote:
> El 27/08/13 22:43, Alfredo Rezinovsky escribió:
>> I have a high load servers and need to use workers or else one CPU
>> core climbs to 100% usage and I see a slow down in the network.
>>
>> There's a way to choose a worker for a single specific request?
>> I have a script and I need to make a request knowing wich worker will
>> answer it.

That is an operating system feature. I believe it is supposed to be
evenly spread randomly over the workers, although there is evidence that
the OS often makes mistakes and Squid has some rotation hacks to balance
it a bit better.

>>
>> I've seen both the coordinator and all the workers listening in TCP
>> 3128 using lsof. This is very confusing.

Only the workers are listen()'ing nd accept()'ing the incoming
connections though. The coordinator is "listening" there in order to be
able to pass the open socket details to workers as they start up. lsof
is not presenting a true picture of usage for each sockt, just what is
process is *able* to use it for any use - even close().

>>
>> --
>> Alfrenovsky
>>
>>
> Answering to myself. hope useful to others...
>
> workers 2
> http_port 3128
> http_port 3100${process_number}
>
> This way I can use port 31001 for the 1st worker and 31002 for the 2nd.
>

NOTE: this still leaves several problems:

1) HTTP protocol contains a persistent connection feature (aka
"keep-alive") where multiple requests are sent on one connection. It is
handling the request count which overloads the worker, not the
connection count.

2) you are now having to write up something explicitly to replicate the
balancing functionality which is built into the kernel.

Amos
Received on Wed Aug 28 2013 - 05:23:28 MDT