Re: [squid-users] cache object sizes

2011/6/3 Amos Jeffries <squid3_at_treenet.co.nz>:
> On 02/06/11 23:10, E.S. Rosenberg wrote:
>>
>> Hi all,
>> Does having different maximum sizes for objects in memory and objects
>> saved on the disk cache have a negative influence on performance or is
>> using squid that way good/recommended?
>
> Only indirectly. And there are three relevant settings. cache_dir have one
> for the disks. The one you are looking at is the global limit.
>
> Best usage and affects are determined by your 'disk' types (HDD, SSD,
> ramdisk, RAM) and I/O method (UFS, AUFS, COSS) and sizes of objects your
> proxy passes regularly.
>
> Request for help:
>  It has been a while since anyone presented us with benchmarking results.
> ~10 years since the last full set comparing all I/O vs several HDD disks and
> a range of objects.
> ~2 years since the last spot-check on particular disk/IO/objects-size combo
> {SSD vs unspecified HDD for COSS <32KB objects}.

I'm afraid we're on a virtual environment w/ networked storage (not
ideal for this purpose), also according to the documentation COSS is
currently not supported in 3.x releases of squid or has that changed?
We are going to start upping the load on the new proxy over the next
few weeks and if you would like I can send you results if you point me
to a doc on how you want the stats gathered.
>
>>
>> The default squid.conf sets both to 4MB, but I'd like to also cache
>> larger objects (like smaller youtube movies) so it seems to me that
>> allowing larger objects in the disk cache will enable squid to cache
>> the larger objects and serve them without the need for them to live in
>> RAM filling the alloted RAM fast and causing more swapping then
>> necessary.
>>
>> Currently I set the max. disk cache object size to 20MB and memory
>> cache I left at 4MB.
>>
>> Regards and thanks,
>> Eli
>
> Squid can store YT videos just fine. Having the default big enough is a
> dream shared by us upstream as well. Sadly until the YT/GV site admin get
> their act together and use a friendly URL scheme we are forced to set the
> limit just below their video sizes.
>
> You can read all the gory details in
> http://wiki.squid-cache.org/ConfigExamples/DynamicContent/YouTube
>
> In fact, if you want to even try caching YT that page is a "MUST READ".
Thanks am going to read it,
Eli
>
> Amos
> --
> Please be using
>  Current Stable Squid 2.7.STABLE9 or 3.1.12
>  Beta testers wanted for 3.2.0.8 and 3.1.12.2
>
Received on Fri Jun 03 2011 - 07:54:10 MDT