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Re: Re: how distribute squid loads to cpus and memories using SMP feature??

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On 27/10/2013 5:51 a.m., Ahmad wrote:
well , actually i dont use squid -k restart

but i do
1-
/usr/sbin/squid -k shutdown
/usr/sbin/squid -k shutdown
/usr/sbin/squid -k shutdown
to make sure it

This schedules 3x signals for shutdown in the kernel. It does take some time for Squid to shutdown (shutdown_timeout config setting plus a few seconds).

- The first signal begins squid graceful shutdown process. Equivalent to SIGHUP

- The second arriving while that is hapening causes an immediate halt, equivalent to SIGABRT (with all the same side effects as a crash.)

It is quite likely that this is where several of your cache problems are coming from as process abort causes corruption of any incompletely written objects.

- third signal goes nowhere because the kernel has no squid process running.

2-
then i start it by
/usr/sbin/squid

it equals to  squid -k restart !

Not quite. With -k restart the coordinator explicitly schedules only one signal to each worker then restarts itself. The code is not quite there yet, but with -k restart the workers may continue running existing transactions in a more graceful exit than they can with a hard shutdown.


but after that when i type ps aux  | grep squid ,

i find squid working !!!!

Yes you started it in step #2.


thats was the problem "in my analysis"

the solutino was ,
when dealing with smp options in squid  , and i want to restart it ,

i must do

*killall -9 squid*

after that no squid running in the background

then its safe to run squid by

/usr/sbin/squid

OR, you must have more patience. How long did you wait for the shutdown to complete? if it was more than 60 seconds there may be a problem which needs to be sorted out differently (kill -9 is not the right long term solution) but since you were getting the "Exiting normally" messages I think it is working properly but slow.

thats what happed with me and it longed 2 days searching about no thing !!!!

now in the logs i dont see
*2013/10/26 18:36:58 kid2| Squid Cache (Version 3.3.9): Exiting normally.
2013/10/26 18:36:58 kid3| Squid Cache (Version 3.3.9): Exiting normally.*


You will only see that in the logs if the workers finished their graceful -k shutdown or -k restart process.

Amos




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