On 10/06/2011 07:04 PM, Michael Meeks wrote:
Hi Neil,
On Thu, 2011-10-06 at 13:45 -0300, Neil Leathers wrote:
In running through my build settings I was trying to decide which
value to use for --with-alloc=???.
Wow - that's a blast from the past. Intel did some work to enable
tcmalloc to be used - one of those micro-optimisations that people hope
will make things faster and often do - but only linearly.
Currently it defaults to "internal" perhaps this should be changed to
default to "system". If there is a good reason why "internal" is
better then it should be documented on the wiki page. Or the trade
offs and recommendations should be documented on the wiki.
Right - so, we should do some performance tests of characteristic
documents with the internal vs. system allocator. AFAIR the system
allocator is rather good on Linux, and terrible on Windows ;-) so
possibly we should have a platform-dependent default.
The main reason, IIRC, for inventing the internal malloc replacement was
that it sometimes happens that OOo needs large amounts of heap for a
rather short time (while loading calc documents, I think), and
traditional malloc implementations never give pages that have become
free again back to the OS. No idea whether that is still a realistic
issue today, though.
-Stephan
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