On Jan 17, 2010, at 11:31 AM, Ashley Pittman wrote:
Tuning the libc malloc implementation using the options they provide to
do is is valid and provides real benefit to a lot of applications. For
the record we used to disable mmap based allocations by default on
Quadrics systems and I can't think of a single case of people who needed
to re-enable it.
It happened to me once. An application couldn't run (not enough memory)
because of the Quadrics stack setting the malloc options.
On Sun, 17 Jan 2010, Barrett, Brian W wrote:
I'm glad that you've been so fortunate. Unfortunately, I have a large
application base in which that is not the case, and we have had to use
mmap based allocation, otherwise memory usage would essentially grow
without bound. So we go back to the age-old debate of correctness vs.
performance.
It would be interesting (though difficult) to know which proportion of
applications are suffering from these settings.
For my part, it is less than 1% (but not 0!).
Sylvain
