On 22.12.2006, at 18:20, Vlad Seryakov wrote:

Another nice thing, you do not need to recompile Tcl, it can be built
with zippy, and then just LD_PRELOAD or can be compiled into the main
program on OSX directly and its functions will be used instead of
later-linked Tcl ones.

Last minute update to that: I just found out that even on Mac OSX
you can preload a libaray, w/o  requirement of having flat namespace
linkage (what we don't). It is similar to LD_PRELOAD:

  export DYLD_INSERT_LIBRARIES=<whatever_lib>.dylib

and off you go! I believe this is after 10.4.0 OSX (but not 100 %sure).

The "crucial" part of vmalloc is as I see mmap. I do not get any
significant reduction in overall memory footprint when many threads
are created/exited. For example, I start 150 threads and the memory
footprint goes to about 380-420 MB (Mac OSX). Then I stop all those
threads and I get down to about 320-330 MB. I believe the effect of
vmalloc is not really visible unless you use mmap to allocate memory.



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