9:05 a.m.
Hello,
since a short time, my slapd crashes often.
I have two servers running in MM replication.
I use openldap version 2.4.30 (for updates are only dedicated timeslots...)
The loglevel is set to 256
I see some strange messages in my log before the slapd crashes:
"ch_realloc of 986032 bytes failed"
---
"ch_malloc of 294896 bytes failed"
---
"bdb(ou=root): txn_checkpoint: failed to flush the buffer cache:
Cannot allocate memory"
---
"ch_malloc of 34159 bytes failed"
What does they mean, how can I solve this problem
The System has 16GByte RAM, no other service is running there.
The Database size is about 1500000 entires and the size of the ldif is
about 2Gbyte
Because of the memory messages, I reduced the
cachesize 1000000
dncachesize 1000000
idlcachesize 3000000
to
cachesize 750000
dncachesize 750000
idlcachesize 2250000
but the problem exist still again.
I can't believe, that the memory is insufficient. Sysstat is running,
and I see enough cache memory (about 5GByte all time), and the Swap
(2GByte) is almost not used (about 2MByte).
vm.swappiness is set to default (60), so the Swap should used more
before the memory is running out.
OOM Kill is enabled via SYSRQ (signalling of processes), so slapd
should terminated by the kernel ...
My configuration:
== DB_CONFIG ==================================
set_cachesize 2 0 1
set_lg_regionmax 262144
set_lg_bsize 2097152
set_flags DB_LOG_AUTOREMOVE
== slapd.conf ==================================
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/yast.schema
include /etc/openldap/schema/rfc2307bis.schema
pidfile /var/run/slapd/slapd.pid
argsfile /var/run/slapd/slapd.args
modulepath /usr/lib/ldap
moduleload back_bdb
moduleload syncprov
moduleload back_monitor
sizelimit -1
timelimit 300
disallow bind_anon
require authc
gentlehup on
tool-threads 8
serverID <001|002>
database bdb
suffix "ou=demo"
rootdn "cn=admin"
directory /var/lib/ldap
loglevel 256
cachesize 750000
dncachesize 750000
idlcachesize 2250000
cachefree 500
dirtyread
dbnosync
shm_key 7
checkpoint 4096 15
index objectClass,entryUUID,entryCSN eq
index cn eq,sub
index ... own indexes
syncrepl rid=<001|002>
provider=ldap://master-<01|02>
type=refreshAndPersist
keepalive=360:10:5
retry="5 5 300 +"
searchbase="ou=demo"
attrs="*,+"
overlay syncprov
mirrormode TRUE
syncprov-checkpoint 100 5
database monitor
==========================================
(I know, dirtyread and dbnosync are not recommended..)
Additional I see messages like:
"bdb_idl_delete_key: c_del id failed: DB_LOCK_DEADLOCK: Locker killed
to resolve a deadlock (-30995)"
Should I care about it?
Thanks Meike
10:08 a.m.
Am Fri, 23 Nov 2012 18:05:14 +0100
schrieb Meike Stone <meike.stone(a)googlemail.com>:
Hello,
since a short time, my slapd crashes often.
I have two servers running in MM replication.
I use openldap version 2.4.30 (for updates are only dedicated
timeslots...) The loglevel is set to 256
I see some strange messages in my log before the slapd crashes:
"ch_realloc of 986032 bytes failed"
---
"ch_malloc of 294896 bytes failed"
---
"bdb(ou=root): txn_checkpoint: failed to flush the buffer cache:
Cannot allocate memory"
---
"ch_malloc of 34159 bytes failed"
What does they mean, how can I solve this problem
The System has 16GByte RAM, no other service is running there.
The Database size is about 1500000 entires and the size of the ldif is
about 2Gbyte
Because of the memory messages, I reduced the
cachesize 1000000
dncachesize 1000000
idlcachesize 3000000
to
cachesize 750000
dncachesize 750000
idlcachesize 2250000
but the problem exist still again.
I can't believe, that the memory is insufficient. Sysstat is running,
and I see enough cache memory (about 5GByte all time), and the Swap
(2GByte) is almost not used (about 2MByte).
[...]
My configuration:
== DB_CONFIG ==================================
set_cachesize 2 0 1
set_lg_regionmax 262144
set_lg_bsize 2097152
set_flags DB_LOG_AUTOREMOVE
you have a cache of 2GB and about 1.5M entries, you should definitly
increase the cachesize, take the size of id2entry, add the size of all
index files and allow additional 20 % for growth.
Additional I see messages like:
"bdb_idl_delete_key: c_del id failed: DB_LOCK_DEADLOCK: Locker killed
to resolve a deadlock (-30995)"
Should I care about it?
probably due to heavy write operations and insufficient cache.
-Dieter
--
Dieter Klünter | Systemberatung
http://dkluenter.de
GPG Key ID:DA147B05
53°37'09,95"N
10°08'02,42"E
10:34 a.m.
Hello Dieter,
> My configuration:
> == DB_CONFIG ==================================
> set_cachesize 2 0 1
> set_lg_regionmax 262144
> set_lg_bsize 2097152
> set_flags DB_LOG_AUTOREMOVE
you have a cache of 2GB and about 1.5M entries, you should definitly
increase the cachesize, take the size of id2entry, add the size of all
index files and allow additional 20 % for growth.
Ok, would be possible to check this ...
So are 16GByte RAM enough for such a database?
> Additional I see messages like:
> "bdb_idl_delete_key: c_del id failed: DB_LOCK_DEADLOCK: Locker killed
> to resolve a deadlock (-30995)"
> Should I care about it?
probably due to heavy write operations and insufficient cache.
What kind of cache (kernel, bdb, idl, dn, ...) does you mean? (Same
Question again:
So are 16GByte RAM enough for such a database? )
Thanks
Meike
12:45 p.m.
I'm afraid to increase the cachesize in DB_CONFIG:
At the moment slapd uses 13146656K referenced Memory - that is a lot ...
Memoy usage:
~# free -m
total used free shared
buffers cached
Mem: 15946 15857 88 0 7 4777
-/+ buffers/cache: 11072 4873
Swap: 2055 11 2043
~# pmap 13631
13631: slapd
START SIZE RSS PSS DIRTY SWAP PERM OFFSET
DEVICE MAPPING
00007fd168000000 40712K 40712K 40712K 40712K 0K rw-p
0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
00007fd173fff000 4K 0K 0K 0K 0K ---p
0000000000000000 00:00 [anon]
00007fd174000000 65532K 65532K 65532K 65532K 0K rw-p
0000000000000000 00:00 [anon]
00007fd177fff000 4K 0K 0K 0K 0K ---p
0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [anon]
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0000000000000000 00:00 [vdso]
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0000000000000000 00:00 [vsyscall]
Total: 14262884K 13195576K 13194838K 13193264K 1640K
11875488K writable-private, 208704K readonly-private, 2178692K shared,
and 13146656K referenced
4:16 p.m.
--On Friday, November 23, 2012 9:45 PM +0100 Meike Stone
<meike.stone(a)googlemail.com> wrote:
I'm afraid to increase the cachesize in DB_CONFIG:
ch_realloc means the system ran out of memory. Increasing the DB_CONFIG
cachesize will run you out of memory more quickly.
The best thing for you to do would be to upgrade to OpenLDAP 2.4.33 and
switch to using back-mdb.
If you are not capable of doing that, I would suggest you use tcmalloc as
an alternative memory allocator to glibc, and reduce your entry cachesize
and idlcachesize. If you can reclaim enough space, you should increase
your DB_CONFIG cachesize, as that is the most important element of
performance with back-bdb/hdb.
--Quanah
--
Quanah Gibson-Mount
Sr. Member of Technical Staff
Zimbra, Inc
A Division of VMware, Inc.
--------------------
Zimbra :: the leader in open source messaging and collaboration
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days inactive
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openldap-technical@openldap.org
4 comments
3 participants
participants (3)
-
Dieter Klünter -
Meike Stone -
Quanah Gibson-Mount