On 4 Mar 2006, at 08:30, Paul Hewlett wrote:
On Thursday 02 March 2006 22:19, Matt Schulte wrote:
All, I'm not sure how to word this question but we're noticing a
lot of
our asterisk boxes no longer have multiple asterisk child processes.
i.e. doing a 'ps ax' reveals only 1 asterisk PID when normally I'm
used
to seeing 8+ .. There is no rhyme or reason to it, and we're using
the
safe_asterisk script which has always worked in the past. Ast
1.2.4, zap
1.2.4, naturally..
All my research has revealed nothing, regarding this, any
suggestions?
What I'm worried about, of course, is the single process getting
overloaded with CPU calls and potentially denying service.
Matt @ NetLogic
Matt
On 2.4 kernels you would be using the LinuxThreads
implementation of POSIX
threads. This emulated the POSIX threading model with some
limitations -
signals could only be delivered to the master thread - there was a
'hidden'
control thread etc... Context switching performance in LinuxThreads
was known
to be poor (sometimes measured in whole seconds) IBM and RedHat
worked on
solving this problem - IBM's effort (NGPT) was abandoned in favour of
REdHat's (NPTL). NPTL was introduced in RedHat 9 (as I remember).
Most modern
distro's now use NPTL and one can tell this by doing 'ps ax' and
seeing only
one asterisk task instead of many. Asterisk without NPTL is
probably not good
for high thruput sites.
And Gentoo users beware - only 2006.0 has adopted NPTL as default.
Previously one had to rebuild the toolchain by specifying USE flags
"nptl
nptlonly" to get NPTL threads (and this takes a long time...)
Have u upgraded to a more modern distro recently ?
Also take a look at the value of LD_ASSUME_KERNEL in your shell
startup scripts
and profiles.
I had a similar weirdness caused by a line in my personal .profile
LD_ASSUME_KERNEL=2.4.1
which I'd put in ages ago to test some (non asterisk) software and
never taken out.
[EMAIL PROTECTED]
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