[Date Prev][Date Next] [Chronological] [Thread] [Top]

Re: (ITS#3967) Use of select in os-ip.c

2.3 libldap supports poll(3)...


At 04:38 PM 8/23/2005, donald.j.lewis@ncr.com wrote:
>Full_Name: Jeff Lewis
>Version: 2.2.17
>OS: Many
>URL: ftp://ftp.openldap.org/incoming/
>Submission from: (NULL) (
>This is something to add to the wish-list for a future enhancement rather than a
>bug report.
>The OpenLDAP client likes to use select() to wait on fds to become ready for
>reading or writing.  In our environment, it would be better if OpenLDAP could
>make use of poll() instead and build its pollfds up dynamically.
>The reason this is important to us is we run in a server environment where there
>can be over 5000 open files when we're under extreme load.  Additionally, we do
>occasional LDAP queries that result in us typically using 1 fd inside the
>OpenLDAP client and that fd can be quite large.  To allocate fd_set structures
>(4, I think) for one very large fd is less than optimal from our point of view. 
>For us, poll would be a much better choice.
>It would be nice if OpenLDAP had a knob of some sort that would allow us to use
>poll instead of select.  If the configure script could figure that out, so much
>the better.  Even if OpenLDAP uses select by default, but gives us an
>OPENLDAP_POLL macro or something similar that we could use in a -D option on the
>compile commands would be hugely appreciated.
>As far as which O/S's we use, they are:
>  AIX (32 and 64 bit Power)
>  HP-UX (ia64, 32 and 64 bit PA)
>  MP-RAS (our own proprietary SRV4 variant)
>  Linux (Red Had for ia64, x8664, i386; SuSE for x8664 and i386)
>  Solaris (32 and 64 bit Sparc)
>I did check the latest stable source release and it appears to still use select.
> I'd be very happy to learn that I'm wrong about that.  :-)