Re: [squid-users] squid cpu usage ..high??

Just one per disk. There may be some benefit to splitting partitions
with diskd (where each cache_dir only gets one disk daemon), but for
aufs you already get a bunch of threads working on each disk...so
splitting them gives you 32 threads for a single disk.

Ronald wrote:

> Hello Joe,
>
> What would you recommend to me? I am having on SCSI 10K 18GB Disk. Ok I am
> going for default number of threads 16 per cache_dir.
>
> Which set is preferable?
> 1. cache_dir aufs 6000 14 256
> cache_dir aufs 6000 14 256
> ( Two partions in this disk each 9GB)
> 2. cache_dir aufs 12000 16 256
> (One partition)
>
> Regards,
> Ronald
>
>
>>Ron Vachiyer wrote:
>>
>>
>>>>50% is probably about right for a 550MHz machine at 40 recs/sec.
>>>>
>>>>How many drives did you say you had? 35 threads is probably a bit much
>>>>for one drive. Actually, the default is great for all but the fastest
>>>>drives--so don't alter the default when configuring.
>>>>
>>>
>>>Hello,
>>>
>>>I too am seeing similar CPU usages using async-io. I compiled squid
>>>2.4STABLE2 with 76 threads. I am using 3 cache dirs on 3 18G 10K SCSI
>>>discs. What is the recommended per-drive number of threads?
>>>
>>Ummm...What's wrong with the default (as I just said in the quoted
>>
> message)?
>
>>Seriously, Squid 2.4 has quite clever aufs code that sets the number of
>>spawned threads based on the number of cache_dirs. This is a good thing
>>and works well--let it do its job. Don't set any number of threads.
>>
>>(When I was saying for all but the fastest disks, I wasn't thinking
>>10k--that's average for a big Squid box...15k /might/ justify
>>configuring additional threads, but probably not.)
>>
>>So let me reiterate: "Don't alter the default when configuring." Let
>>this be our mantra with regard to aufs. Repeat as needed, until you
>>have been convinced. ;-)

                                   --
                      Joe Cooper <joe@swelltech.com>
                  Affordable Web Caching Proxy Appliances
                         http://www.swelltech.com
Received on Tue Sep 18 2001 - 21:57:37 MDT