Why do we have the 80% limit set?

On Wed, Sep 4, 2013 at 11:45 AM, johannes hanika <[email protected]> wrote:
> okay, cool. your cache memory size is just too small. 1.5G as in your last
> mail seems more reasonable, you might even try 2G.
>
> sure, it's a cache.. it throws out the stuff it thinks you don't need any
> more quite as urgently as other stuff, to stay within the given limit.
>
> -jo
>
>
> On Wed, Sep 4, 2013 at 11:38 AM, Pascal Obry <[email protected]> wrote:
>>
>>
>> Johannes,
>>
>> > just to be sure: is the cache just not very effective at what it does or
>> > are all the thumbnails always gone when you restart?
>>
>> > [mipmap_cache] level [i0] ( 200x 150) fill 171.19/213.97 MB (80.00% in
>> > 11797/16384 buffers)
>> > [mipmap_cache] level [i1] ( 400x 300) fill 36.46/52.75 MB (69.12% in
>> > 637/1024 buffers)
>> > [mipmap_cache] level [i2] ( 800x 600) fill 16.94/52.74 MB (32.12% in
>> > 74/256 buffers)
>> > [mipmap_cache] level [i3] (1600x1200) fill 0.00/52.74 MB (0.00% in 0/64
>> > buffers)
>> > [mipmap_cache] level [f4] fill 0/2 slots (0.00% in 0/4 buffers)
>> > [mipmap_cache] level [f5] fill 2/2 slots (100.00% in 2/4 buffers)
>> > [mipmap_cache] scratch fill 14.65/13.18 MB (111.11% in 2/4 buffers)
>> > [mipmap_cache] level | near match | miss | stand-in | fetches | total rq
>> > [mipmap_cache] i0    |  91.67% |  91.67% |   -nan%  |  46.15% | 100.00%
>> > [mipmap_cache] i1    |   -nan% |   -nan% |   -nan%  |   0.00% |   0.00%
>> > [mipmap_cache] i2    |   -nan% |   -nan% |   -nan%  |   0.00% |   0.00%
>> > [mipmap_cache] i3    |   -nan% |   -nan% |   -nan%  |   0.00% |   0.00%
>> > [mipmap_cache] f4    |   -nan% |   -nan% |   -nan%  |   0.00% |   0.00%
>> > [mipmap_cache] f5    |   -nan% |   -nan% |   -nan%  |  53.85% |   0.00%
>>
>> Using cache_memory to 536870912 it looks like the i0 cache is almost
>> full (reaching 80% and not moving above). Do we have cache invalidation
>> for old thumbnails in the case where a cache is full?
>>
>> I'm asking because testing with a cache_memory of 1536870912 seems to
>> help... I still need to do more testing though.
>>
>> And this makes sense as I have observed this behavior since I have
>> imported a large bunch of my images recently.
>>
>> Pascal.
>>
>> --
>>   Pascal Obry /  Magny Les Hameaux (78)
>>
>>   The best way to travel is by means of imagination
>>
>>   http://v2p.fr.eu.org
>>   http://www.obry.net
>>
>>   gpg --keyserver keys.gnupg.net --recv-key F949BD3B
>>
>>
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>
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-- 
José Carlos García Sogo
   [email protected]

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