Kernel parameter changes for PeopleSoft in UNIX flavours

During all these years of my work on PeopleSoft on various flavours of UNIX (RHEL,AIX,SUSE,Solaris)
There are specific modifications which are needed to be made in the various kernel parameters on the application/Web servers for proper functioning of Server Processes.

The below given details are absolutely based on my work,so please exercise the changes judiciously considering the implications of these parameters.

The following 2 are the most important parameters with respect to PeopleSoft which need to be taken care of;--

1.) msgmni:--
This parameter takes care of the number of message queues.By default this parameter is 16 in all Unix OS's.
IF this parameter is not changed to required value, the most likely error one will face is:--

Cannot create error process - fork() 
while booting up the application server, for which when Tuxlog is checked you will find the following error entries:--

System init function failed, Uunixerr = : msgget: No space left on device

 Please make sure the msgmni is set to 1024 in /etc/systctl.conf.
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2.) fs.file.max :--
This parameter is for the no. of open files, this is denoted by -n when you pass ulimit-a 

set this to 65536 in /proc/sys/fs/file-max.

A typical sysctl.conf for peoplesoft application server should be like this:--


kernel.msgmnb = 65536 ---> Controls the maximum size of a message, in bytes
kernel.msgmax = 65536---> Controls the default maximum size of a message queue
kernel.shmmax = 1073741824--->Controls the maximum shared segment size, in bytes
kernel.shmall = 2097152--->Controls the maximum number of shared memory segments, in pages
fs.file-max = 65536
kernel.msgmni = 1024