[pquerna]

Good blog post explaining the behavior of glibc, I also saw this first hand when profiling Apache awhile back too:

http://mail-archives.apache.org/mod_mbox/httpd-dev/201111.mb...

https://github.com/apache/httpd/blob/trunk/server/util_time....

The internals of glibc can often be pretty surprising sometimes, I'd really encourage people to go spelunking into the glibc source when they are profiling applications.