[ naviserver-Feature Requests-1166553 ] Add ttrace module

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Feature Requests item #1166553, was opened at 2005-03-19 09:35
Message generated for change (Comment added) made by sdeasey
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Category: Tcl-API
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Zoran Vasiljevic (vasiljevic)
Assigned to: Zoran Vasiljevic (vasiljevic)
Summary: Add ttrace module

Initial Comment:
The ttrace module is written in Tcl and is part of the
threading
extension and available on SF:

  http://sourceforge.net/projects/ttrace

The basic idea is to use Tcl trace capabilities and
replicate state
of the Tcl interpreter from one to other threads in a
lazy mode.
So, instead of loading everything in one interp and
then using clumsy
introspective script to build the initialization script
for other threads
the ttrace package loads all procedure, namespace (et
al) defs
and stuffs them into a shared array. By overloading the
Tcl [unknown]
command, resources are brought into life as needed. 
This results in drastic memory footprint reduction and
much faster
thread creation. 

I have it running for about 1 year w/o any noticable
speed penalty.
One of the OpenACS users also tried it and is very
pleased. I think
we can add this as alternate interp initialization scheme.




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>Comment By: Stephen Deasey (sdeasey)
Date: 2005-03-26 11:26

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Good idea.  I remember you mentioning rewriting in C some
time ago, is that still the plan?

I took a quick look at the ttrace module in sf cvs and had a
little trouble following it.  I guess that's just the nature
of the problem, there seems to be a lot of fiddly things to
consider.  It would be nice to make it more obvious what
steps are being taken, but nothing comes to mind immediately...



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Comment By: Vlad Seryakov (seryakov)
Date: 2005-03-19 13:30

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could be a good option, yes

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