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Severe performance regression with latest CVS sources?: msg#00025

lisp.mcclim.devel

Subject: Severe performance regression with latest CVS sources?

Hello,

Paolo Amoroso writes:
> When I update my working copy of McCLIM's CVS sources, I do a quick
> test to check that things still work fine. I run the CLIM Listener
> and evaluate a form that draws a monster graph:
>
> (time (clim-listener::com-show-class-subclasses t))
>
> Until a few weeks ago, I got run times under 1 s (I seem to remember
> about 0.7-0.8 s) with CMUCL under Slackware Linux 10.0. With the
> latest McCLIM CVS sources and CMUCL Snapshot 2006-02 (19C), I now get
> times over 15 s, no matter whether I initialize multiprocessing with
> (mp::startup-idle-and-top-level-loops) or not.
>
> Can anybody confirm this?

Most likely you have run into the same problem I did with Gsharp,
namely that output-record creation is now slower with tree-structured
output records. You should be able to ask for a sequence output
record, or you can do what I did with Gsharp, namely organize the
output records into smaller hierarchical units.

Take care,
--
Robert Strandh

---------------------------------------------------------------------
Greenspun's Tenth Rule of Programming: any sufficiently complicated C
or Fortran program contains an ad hoc informally-specified bug-ridden
slow implementation of half of Common Lisp.
---------------------------------------------------------------------


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