04-29-2018
Quote:
Originally Posted by
tmonk1
We had 27GB free memory when restarted the server,But it continuously decreased to reach 1500M and keeping the free mem between 1500 to 3000.
I am no Solaris expert, but this is a common trait of UNIX-kernels: they commit otherwise unused memory to file caching. When you start there is a lot of free RAM as no applications have been started yet but at the same time there is nothing which makes sense to cache, so the RAM remains free.
Once your application(s) start(s) not only does that use RAM but the processes also use (-> load/write to) certain parts of the filesystem to work with. Now that a pattern of file usage emerges the UNIX kernel uses leftover RAM to cache exactly these parts of the filesystem. Hence the free memory seemingly drops.
Most UNIX kernels (and i suppsoe Solaris does too, in AIX this is called minperm and maxperm) also have some tuning parameter for how much memory should not be used for file caching but always be available for programs. I suppose this is set to effectively 1.5GB, so you see the memory not dropping below this point.
I hope this helps.
bakunin
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LEARN ABOUT HPUX
bufpages
dbc_max_pct(5) OBSOLETED dbc_max_pct(5)
NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter
DESCRIPTION
These tunables have been obsoleted and removed. Do not make any changes to these tunables, as they have no effect on the kernel.
Use the file cache tunables and (see filecache_max(5)).
In previous releases, the tunables and were used to set limits to the dynamic buffer cache, and the tunables and were used for tuning the
buffer cache when a static cache was desired.
This release of HP-UX offers improved file caching technology and improved physical memory control associated to caching file I/O data.
The number of tunable parameters used to control file caching memory usage is reduced from five to two, and previous usability issues are
addressed.
Restrictions on Changing
These tunables should not be modified. Attempting to tune any of the obsolete buffer cache tunables, or results in an error.
Use the tunables and to set limits on the file cache. Note that, on a any given system, the optimum values of these two new tunables are
not necessarily equivalent to the optimum values of the obsolete buffer cache tunable values in the older systems. You should first deter-
mine if the new default values yield acceptable performance on your system, before attempting to change the values of the new file cache
tunables.
AUTHOR
and were developed by HP.
SEE ALSO
filecache_max(5).
Kernel Tunable Parameter dbc_max_pct(5)