Alfresco Tuning and Performance

http://wiki.alfresco.com/wiki/JVM_Tuning#The_Effects_of_NewSize



http://alfrescoshare.wordpress.com/category/tuning/

http://www.alfresco.com/services/subscription/supported-platforms/

Too Many open files in Alfresco

This is related to facing the situation where alfresco deployed in UNIX environment gives the error of "Too Many Opened Files". This is more often related to File handles and Lucene. UNIX systems is configured by default to allow users a maximum of only 1024 open file handles, which is often not sufficient for the file structure used by the indexes. Thus while setting up Alfresco on UNIX do the following check and configuration to get over this issue.

 Verify that the global settings for maximum number of file handles is large enough.
As a user used to run Alfresco run :

ulimit -n

You can check the number of open files allowed per user with the command

cat /proc/sys/fs/file-max

This gives the number of file handles that can be opened by user at a time.
To increase this number, go to/etc/security/limits.conf file in edit mode and the below lines

username soft nofile 4096

username hard nofile 65536

where username is the name of user to run Alfresco.

And finally restart your Alfresco for the changes to become active.

Check the original issue here.

Other references
http://www.xenoclast.org/doc/benchmark/HTTP-benchmarking-HOWTO/node7.html
http://ironman.darthgibus.net/?tag=too-many-open-files