80% is a common mark for hashtables to become inefficient. the hopscotch
hashing scheme we use claims to go as high as 90 or 95, i forget, but we
still use 80 as a soft limit (meaning if you're below 80, say 79, you
always get your new slot, even if it takes you to 95).
j.
On Wed, Sep 4, 2013 at 12:01 PM, Jose Carlos Garcia Sogo
<[email protected]>wrote:
> 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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