That's already done inside libmilter : With sendmail 8.14.0, you shall compile libmilter with :
APPENDDEF(`conf_libmilter_ENVDEF',`-D_FFR_WORKER_MODEL') This will switch the libmilter thread model to a pool of workers instead of one thread per sendmail connection. And the number of threads in the filter will be the number of threads really doing something... This makes a very big difference on systems handling a big number of simultaneous connections. Here are some old slides (2003) from an old presentation I've done at sendmail about that : http://j-chkmail.ensmp.fr/papers/workermilter.pdf Well... I've got an award from sendmail... 8-) http://www.j-chkmail.org/wiki/doku.php/award Ernest Wypierowski wrote: > Good evening, > > version: > libmilter - sendmail-8.14.2 > clamav-milter - clamav-0.91.2 > > > If you configure libmilter library with using poll() rather than > select() and use workers pool you might hit problem related with locking > up your clamav-milter. > > To reproduce this kind of behavior you should ran clamav-milter in 32 > bit mode, lower max-children and set timeout to some rather high value. > When number of simultaneous connections exceed max children then every > new connection will equal one thread. Going step further, when threads > allocate all virtual memory available for clamav-milter workers from > libmilter will not have space to execute (clamav-milter: LAUNCH_WORKER > error: Cannot allocate memory). > > Daemon clamav-milter will not answer with temporary error but will > keep going with blocking threads/connections. > > How to solve this kind of problem? Does not clamav-milter is prepare for > workers from libmilter? > > Most interesing is how to limit clamav-milter's resource based on thre- > ads. In described situation number of threads are not equal number of > connections, limiting it with dont-wait threads is not a good idea. > Maybe there is a way to limit numbers of threads that workers can > consume? > > Best regards, > Ernest Wypierowski > _______________________________________________ > http://lurker.clamav.net/list/clamav-devel.html > Please submit your patches to our Bugzilla: http://bugs.clamav.net > -- --------------------------------------------------------------- Jose Marcio MARTINS DA CRUZ http://j-chkmail.ensmp.fr Ecole des Mines de Paris 60, bd Saint Michel 75272 - PARIS CEDEX 06 mailto:[EMAIL PROTECTED] _______________________________________________ http://lurker.clamav.net/list/clamav-devel.html Please submit your patches to our Bugzilla: http://bugs.clamav.net
