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Old 03-18-2011, 10:48 AM
Moisés Barba Pérez
Default 389 Memory issue


** I'm having a memory issue with 389 Directory server. The problem "cannot allocate memory" appears very often and don't find the source.

** The exactly log is this:

memory allocator - malloc of 4629376 bytes failed; OS error 12 (Cannot allocate memory)
The server has probably allocated all available virtual memory. To solve
this problem, make more virtual memory available to your server, or reduce

one or more of the following server configuration settings:
* nsslapd-cachesize******* (Database Settings - Maximum entries in cache)
* nsslapd-cachememsize**** (Database Settings - Memory available for cache)
* nsslapd-dbcachesize***** (LDBM Plug-in Settings - Maximum cache size)

* nsslapd-import-cachesize (LDBM Plug-in Settings - Import cache size).
Can't recover; calling exit(1).

The server is a CentOS 5.5 32bits with* 2.6.18-194.3.1.el5.centos.plusPAE kernel. The server has 12G memory, I know that a 32bits kernel can't manage 12G but the kelnel is PAE so I can use about 4G and the server never rise this value of used memory before crash. 5G of swap. 8 processors.

The directory server is 389-ds-base-1.2.5-1.el5, with 27 different db. I have about 40k users in the directory. I have been talking in irc channel with Rich about directory caches and y I have try with this configurations without a resolution for the problem:

dbcachesize = 2 * (SUM all .db4 size) | each cachememsize = 10M (default) -> fails
dbcachesize = 10M (default) | db$i cachememsize = 2 * (db$i/id2entry.db4 size) -> fails
dbcachesize = 10M (default) | db$i cachememsize = 4 * (db$i/id2entry.db4 size) -> fails

Te SUM for all .db4 files size is about 800M.

I have monitor the db with db_stat comand and I get always a entry ratio for id2entry db betwen 50 and 60% in all cases. The value for max-file-descriptors in 389 is 65355. The size of the hugepagesize is 2M. This is the ulimit -a results:

core file size********* (blocks, -c) 0
data seg size********** (kbytes, -d) unlimited
scheduling priority************ (-e) 0
file size************** (blocks, -f) unlimited
pending signals**************** (-i) 208896

max locked memory****** (kbytes, -l) 32
max memory size******** (kbytes, -m) unlimited
open files********************* (-n) 64000
pipe size*********** (512 bytes, -p) 8
POSIX message queues**** (bytes, -q) 819200

real-time priority************* (-r) 0
stack size************* (kbytes, -s) 1024
cpu time************** (seconds, -t) unlimited
max user processes************* (-u) 208896
virtual memory********* (kbytes, -v) unlimited

file locks********************* (-x) unlimited

I have read in Metalink an error for sun one directory server 5.2 that this problem can be caused because of "multiple memory pool" but I couldn't find where it is configured (I guess 389 split from sun one in this version). And I don't know if it is important to my problem.

The OS error 12 is a default message from operating system for memory allocation and I'm thinking in a linux scheduler problem, but I don't find nothing.

If somebody have an idea, please tell me...



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