Re: [squid-users] Re: can squid load data into cache faster than sending it out?

On 07/05/11 08:54, Dave Dykstra wrote:
> Ah, but as explained here
> http://www.squid-cache.org/mail-archive/squid-users/200903/0509.html
> this does risk using up a lot of memory because squid keeps all of the
> read-ahead data in memory. I don't see a reason why it couldn't instead
> write it all out to the disk cache as normal and then read it back from
> there as needed. Is there some way to do that currently? If not,

Squid should be writing to the cache in parallel to the data arrival,
the only bit required in memory being the bit queued for sending to the
client. Which gets bigger, and bigger... up to the read_ahead_gap limit.

IIRC it is supposed to be taken out of the cache_mem space available,
but I've not seen anything to confirm that.

> perhaps I'll just submit a ticket as a feature request. I *think* that
> under normal circumstances in my application squid won't run out of
> memory, but I'll see after running it in production for a while.
>
> - Dave
>
> On Wed, May 04, 2011 at 02:52:12PM -0500, Dave Dykstra wrote:
>> I found the answer: set "read_ahead_gap" to a buffer larger than the
>> largest data chunk I transfer.
>>

Amos

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