renggli at gmail.com
Sat Oct 27 19:34:05 UTC 2007
> How performant are these DynamicVariable lookups?
They are quite performant, if your stack has a reasonable size and you
are calling the lookup a reasonable number of times. There is a
primitive in the VM that answers the next context possible handler.
I remember a project where dynamic variables were used to translate
every individual string displayed on the page. The rendering was not
measurably slower than in the untranslated case.
If you need raw speed, it might be smart to add an additional variable
to Process which provides you with O(1) performance. However since
this is much trickier to port, we don't use it in Seaside.
I am co-author of an not yet published paper that compares the two
approaches in the discussion. The observed numbers for 10^6 queries
are the following:
Stack depth Dynamic Variables Process Variable
0 7455 ms 258 ms
100 7967 ms 258 ms
1000 17883 ms 255 ms
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