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(ITS#7222) Slapd hangs on high load
OS: Centos 6.2 x86_64
Submission from: (NULL) (126.96.36.199)
While testing openlap, with some of my data, slapd regularly hangs. I did manage
to "catch" it, but i need expert's interpretation of traces.
I' using db-5.3.15 (latest), compiled with:
--enable-shared --enable-static \
--enable-tcl --with-tcl=/usr/lib64 \
--enable-cxx --enable-sql \
and openldap-2.4.30, compiled with:
CFLAGS="-g -I/usr/local/db/include" CPPFLAGS="-g -I/usr/local/db/include"
LDFLAGS="-L/usr/local/db/lib -Wl,-R/usr/local/db/lib" ./configure \
Slapd is configured to use slapd.d directory (db). Inside, two databases are
configured - ie. ou=p,dc=pero,dc=com and ou=d,dc=pero,dc=com, including monitor
db. First database is using 10Gb on disk, and have around 10M unique dn's, while
second one is using around 3-4Gb, few mil. dn's.
Server have 16G of ram, and 2xquad core CPU - total of 8 cpu's (and disks are
I'm using python scripts to generate load on openldap. First i fill in required
data (10Gb), and then do some transaction processing (read/update/write).
Filling part goes without problems, but on transaction processing, slapd
regularly gets stuck. I'm only able to trigger this using more than one
connection - simulating couple of clients, and high load (1-2 req/sec).
Complete traces from gdb when this happens, are
So, am i doing something wrong or openldap is...?