Pagecache size

[Marcelino Mata]

Hi all,
 
We have a Opteron workstation with 16GB RAM which we use to run large
memory jobs.  It seems that no matter what we set
/proc/sys/vm/pagecache, the system starting swapping out after 12GB RAM
is used.  The largest job only needs about 13GB RAM so it runs in RAM.
I have read the knowledge based docs and a few others but I can't seem
to address this issue.
 
RHEL 3.0 Update5  2.4.21-32.0.1.ELsmp (64bit)
 
Marcelino