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Configure hugemem on RHE4 linux with oracle 10g

Posted on 2008-06-19
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Last Modified: 2013-12-18
We just got a request from our DB group to increase ramfs on RHE4 linux, running oracle 10g.  One of our DBA's recommended installing hugemem kernel.  We installed and followed the steps from this link to enable hugemem.

http://www.puschitz.com/TuningLinuxForOracle.shtml#ConfiguringHugePagesInRHEL4

Our setup here, dl380 connected to EMC san localhost has 10gb of memory.  I notice when trying to increase shmmax under proc limit is only 4gb.  I want to push to 6gb and let DBA increase SGA upto 4gb.  Does not work, can someone help?  I also notice once we configured everything under this link we do not see file being created under /dev/shm which is mounted as ramfs.  

Kernerl version. Linux <hostname> 2.6.9-42.0.3.ELhugemem #1 SMP Mon Sep 25 17:39:50 EDT 2006 i686 athlon i386 GNU/Linux

My technical skills are more Unix/Linux not Oracle.  Need some help with this one...
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Question by:wcadmins
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laneduncan earned 500 total points
ID: 22002094
It sounds like you're running a 32-bit OS, and I believe that 4GB is the limit that can be used for any one process on 32-bit architecture.  That's not to say that the system can't use more, but rather that an individual process can't use more than that.

The 32-bit hugemem kernel, I believe, ups the per-process limit from 3.something GB to 4GB.

I'm sure someone will jump in if I'm mistaken.
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