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From Parin Shah <>
Subject Re: mod_cache performance
Date Fri, 13 Jan 2006 00:34:37 GMT
We tried to solve thundering herd problem wih cache-requester module
which I have not committed yet. It is currently available on source

I have not found enough time to work on it after summer of code was
over as I was busy with my thesis, internship. now I have just
relocated to calif recently. So, I should be actively working (in
couple of weeks probably) on cache-requester soon once things settle
down for me.

meanwhile, feel free to use mod-cache-requester if you find it useful.
Let me know if I could be of any help.


On 1/12/06, Graham Leggett <> wrote:
> Brian Akins wrote:
> > A short list I have (mostly mod_disk_cache):
> >
> > -read_table and read_array seem slower than they should be
> > -"thundering herd" when a popular object expires
> Thundering herd was one of the original design goals of the new cache
> that was never fully followed through. With the work getting the cache
> to handle transfer failures gracefully, the next logical step is to
> solve thundering herd.
> > -writing out request headers when not varying
> >
> > I have submitted patches for some of these in the past, but I will try
> > to quantify the performance implications of these.
> Submit them to bugzilla to make sure they do not drop on the floor, then
> nag this list. I will be off the air till the end of the month to have a
> holiday, but after that I definitely plan to get my hands dirty.
> Regards,
> Graham
> --

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