RE: high CPU usage

        Dear sir:
        if i mount cache file system in async mode , does this can improve
disk I/O performance.
        like this:
        /dev/da4s1e /cache5 ufs rw,async
2 2

        if i complie squid with async-io and mount my cache file system in
async mode.
        Dose we can get better performance..

        my system using piii 450 , 100GB cache (6*18G ultra wide scsi
disk)..1GB ram
         
-----Original Message-----
From: Francis A. Vidal [mailto:francis@usls.edu]
Sent: Thursday, November 25, 1999 11:51 AM
To: Clifton Royston
Cc: Squid Users
Subject: Re: high CPU usage

---- Quoting Clifton Royston's message, sent 11/24/99 7:37am ----

> > i'm running squid2.2-stable4 (async-io enabled) on a FreeBSD 3.3-stable
> > (w/ softupdates) machine with 16GB cache space and 256MB of RAM. my
system
> > is experiencing 97-98% CPU usage with 5-6 clients accessing it. any
> > related experiences?
>
> You need to give a little more info for people to be able to help.
>
> 97-98% CPU usage for the *system overall* is normal if you have any
> "niced" processes running to use idle time; for instance, if you run
> Seti@Home, RC5 codebreaking, the Mersenne prime search, or any of many
> other programs which essentially put all the idle cycles to use.
> That doesn't have anything to do with Squid, and won't significantly
> interfere with Squid performance or with other processes.

not the overall CPU usage but just the squid process. i'm not running any
code-breaking process or Seti@Home on the machine. it's purely a
proxy/cache machine.
 
> An ongoing 97-98% CPU usage for Squid, on the other hand, would be
> very unusual. On a 486 system I run with far less RAM, it's never
> anything near that.

yes, my earlier squid setup did not exhibit this behaviour just now.
 
> What is the "load" figure reported by uptime or top? And is Squid
> consistently the top process, or are other things taking most of the
> CPU?
 
the load figure is from top and is the squid process itself.

> P.S.: async-io is not needed or helpful for Squid on current FreeBSD,
> and should be turned off.

why? can you please elaborate? in the squid FAQ, it mentioned to turn on
async-io on "very busy" machines. what exactly is a "very busy" machine?

-- 
francis vidal	university of st. la salle, bacolod city, philippines
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