Subj : Problem with performance of JSCallFunction
To   : netscape.public.mozilla.jseng
From : c_ibrahim
Date : Tue Oct 26 2004 01:47 am

Hi,

I need to execute many similar procedures; the only difference is in
the variable value. The first tryout is to use JS_CompileScript once
and JS_ExecuteScript many times. It is very fast but I cannot pass
parameters so if I wanna use it in the real application, I gotta call
JS_CompileScript many times, which I think won't be really efficient.

So the next tryout is to call JS_CompileFunction once and call
JS_CallFunction many times. Works like a charm but JS_CallFunction is
about 25 times slower than JS_ExecuteScript.

What I did in the tryout is simply evaluating the expression (2<3)
1000 times for JS_CompileScript-JS_ExecuteScript. JS_CompileFunction
compiles a function taking parameters p1 & p2 that returns (p1<p2) and
JS_CallFunction is called 1000 times with parameters value 2 & 3.

The performance of JS_CallFunction is too slow for the real
application. But I cannot see other alternative for the purpose of
'compile once-execute many times -passing parameters'.

Anyone has any idea of alternatives in achieving this purpose? Or to
improve performance of JS_CallFunction? Or both..

To Brendan Eich; thanks a lot for your help in getting JS_CallFunction
to work :)

thx in advance,
cath

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