Fwd: MagmaCollectionReader>>size takea a long time

[Burella Juan M.]

Chris thanks for your answers. Yes, I was using the release 39. I´ve tested
it with r40 (r40Gamma3) and it worked better.
I tested this with a bigger collection (84661 objects ) and it takes 16
seconds to answer either #size and #lastKnownSize. Do I have to set
something to enable #lastKnownSize caching?

The new results are:
 "------------ 84661 objects - MagmaCollection>>size - fiirst evaluation"
[ (magmaSession root at: #ThesaurusTerm) size ] timeToRun  "answer
about  247 milliseconds"
"Note: magmaSession root at: #ThesaurusTerm answer a MagmaCollection"

 "second evaluation"
[ (magmaSession root at: #ThesaurusTerm) size ] timeToRun  "answer about 0
milliseconds"

"MagmaCollectionReader>>size  first evaluation"
[ ((magmaSession root at: #ThesaurusTerm) read: #issnString) size ]
timeToRun "answer about   16771 milliseconds"
 "second evaluation"
[ ((magmaSession root at: #ThesaurusTerm) read: #issnString) size ]
timeToRun "answer about    16870 milliseconds"

 "MagmaCollectionReader>>size  first evaluation"
[ ((magmaSession root at: #ThesaurusTerm) read: #issnString) lastKnownSize]
timeToRun "answer about    16573 milliseconds"
 "second evaluation"
[ ((magmaSession root at: #ThesaurusTerm) read: #issnString) lastKnownSize]
timeToRun "answer about     16529 milliseconds"


 "------- 5500 objects - MagmaCollection>>size - fiirst evaluation"
[ (magmaSession root at: #Serial) size ] timeToRun  "answer about 698
milliseconds"
"Note: magmaSession root at: #Serial answer a MagmaCollection"

 "second evaluation"
[ (magmaSession root at: #Serial) size ] timeToRun  "answer about 0
milliseconds"

"MagmaCollectionReader>>size  first evaluation"
[ ((magmaSession root at: #Serial) read: #issnString) size ] timeToRun
"answer about  1246 milliseconds"
 "second evaluation"
[ ((magmaSession root at: #Serial) read: #issnString) size ] timeToRun
"answer about   1246 milliseconds"

Juan M.

On 8/31/07, Chris Muller <asqueaker at gmail.com> wrote:
>
> Juan, please the section "Optimizing Performance" in the documentation
> about querying MagmaCollections to understand when #size will be very
> fast vs. pretty slow.
>
> http://wiki.squeak.org/squeak/5859
>
> For the cases that are "pretty slow" (i.e., a Reader requiring
> distinct results), note you have #lastKnownSize, which is the cached
> size (therefore instant access).
>
> - Chris
>
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