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Re: slapd quits under heavy load



--On Tuesday, March 14, 2006 10:19 AM -0800 Herb Hrowal <hhrowal@gmail.com> wrote:

I'm having a problem where slapd decides to shut itself down under
heavy load. I've traced the problem to this section of code in
daemon.c.

		switch(ns = SLAP_EVENT_WAIT(tvp)) {
		case -1: {	/* failure - try again */
				int err = sock_errno();

				if( err == EBADF
# ifdef WSAENOTSOCK
					/* you'd think this would be EBADF */
					|| err == WSAENOTSOCK
# endif
				) {
					if (++ebadf < SLAPD_EBADF_LIMIT)
						continue;
				}

				if( err != EINTR ) {
					Debug( LDAP_DEBUG_CONNS,
						"daemon: select failed (%d): %s\n",
						err, sock_errstr(err), 0 );
					slapd_shutdown = 2;
				}
			}
			continue;

SLAPD_EBADF_LIMIT is defined as 16.

My question is, why was 16 chosen for this value? Is there any reason
for us to either increase this limit or remove this section
alltogether? We would like to get to the point where slapd doesn't
silently stop running.

What version of OpenLDAP are you running? What operating system are you running under?

That particular bit of code was to address a *bug* in the /Solaris Kernel/. Basically, that clause is only going to get triggered when there are serious problems with your OS.

--Quanah

--
Quanah Gibson-Mount
Principal Software Developer
ITS/Shared Application Services
Stanford University
GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html