RE: [squid-users] Measuring Squid Efficiency

The request hit rate ~39% is IMHO a pretty nice value, also the
bandwitdh savings!
As you have a cascade of proxies, you can try to increase your hit rate,
if you split the cached object size between parent and children caches.

I run a proxy cascade, where the parents cache objects larger than 8 KB
and the childs cache objects smaller than 8 KB. This avoids duplicated
object caching and could increase the hit rate a little bit.

The 'Proxy efficiency' tells you, that the proxy woks fast enough the
deliver objects faster from cache, than from the origin server. Of
course, this shoud be ;-) But on the outher hand you can figure out some
bottlenecks if it isn't.

Compared to the values I have on my cache cluster, I would say your
proxy works very well!

Regards Michael

On Thu, 2005-03-31 at 04:01, Bob Morrison wrote:
> Thanks for the info on Calamaris.
>
> I installed Calamaris 2.99 and came up with these results:
> Total amount: requests 50000
> Total amount cached: requests 19488
> Request hit rate: % 38.98
> Total Bandwidth: Byte
> 346M
> Bandwidth savings: Byte 50716K
> Bandwidth savings in Percent (Byte hit rate): % 14.30
> Proxy efficiency (HIT [kB/sec] / DIRECT [kB/sec]): factor 4.47
> Average speed increase: % 12.48
>
> The cache in this example is a child cache that is serving about 300 PC's in
> a high school. The cache size is 1GB with 16K first level dirs and 256
> second level dirs.
>
> Should I be worried about these numbers? If so, what should I do to improve
> them?
>
> Thanks in advance for any help
>
> Bob Morrison, CNE, MCSE
> Network Administrator
> Wallingford CT Public Schools USA
>
>
> -----Original Message-----
> From: Michael Pophal [mailto:michael.pophal@siemens.com]
> Sent: Wednesday, March 30, 2005 3:10 AM
> To: rmorris@snet.net
> Cc: squid-users@squid-cache.org
> Subject: Re: [squid-users] Measuring Squid Efficiency
>
> Take a look at the reporting tool calamaris. There you get information
> about caching efficiency and you can see the efficiency of your
> refresh_patterns in a separate report as well. There are also values
> like:
> - Bandwidth savings in Percent (Byte hit rate)
> - Proxy efficiency (HIT [kB/sec] / DIRECT [kB/sec])
> - Average speed increase
> and a huge amount of reports!
>
> http://cord.de/tools/squid/calamaris/Welcome.html.en
>
> Regards
> Michael
>
> On Wed, 2005-03-30 at 03:52, Bob Morrison wrote:
> > I am new to squid and would like to know what information to look for to
> see
> > if a squid cache needs adjusting to perform more efficiently. The
> > evaluation tool we’re using is CacheManager.CGI script that comes with
> > squid.
> >
> > Thanks in advance for any help
> >
> > Bob Morrison, CNE, MCSE
> > Network Administrator
> > Wallingford CT Public Schools USA
> >

-- 
Mit freundlichen Grüssen / With kind regards
Michael Pophal
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