[squid-dev] [PATCH Bug 4534 and N-bit fixes for CacheDigest

[Kinkie]

Hi,
   I think it is reasonable to expand the number of objects Squid can
manage. 32-bit systems are almost rare to come by nowadays.

On Sun, Jul 10, 2016 at 11:08 AM, Amos Jeffries <squid3 at treenet.co.nz>
wrote:

> On 10/07/2016 1:37 a.m., Amos Jeffries wrote:
> > This patch converts the CacheDigest members and method parameters to use
> > explicitly sized data types more appropriate for what details they hold.
> >
> > * 64-bit Digest capacity (entry count)
> > * 32-bit Mask Size (byte count)
> > *  8-bit Bit count per entry
> >
> > Due to various store_digest.cc code still relying on masks not exceeding
> > 2^31-1 worth of memory space we have to still assert that bitCount
> > calculation does not exceed that value.
> >
>
> Additional to this, to fully fix the bug 4534 issue we are going to have
> to decide if it is reasonable to have extremely large Cache Digest masks
> (several tens of GB or memory).
>
> The caches the bug appears on are all several TB of size (by space). But
> even more importantly they are spread over more than 5 cache_dir. So the
> 2^25-ish limit on entries per cache_dir is not keeping the total
> Squid-wide object count within a 32-bit value.
>
> Amos
>
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-- 
    Francesco
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