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Full Discussion: %memused is high
Operating Systems Linux Red Hat %memused is high Post 302992028 by anil529 on Monday 20th of February 2017 05:45:52 PM
Old 02-20-2017
%memused is high

All

I see cpu and memory usage are under control, only cache gets high upto 99% using sar -r command

I did echo3 and cleaned the drop caches

do we need to monitor this , why my application going high upto 99.8% memused in sar command , this is cache memory which is going high

will this cause any performance issues like slowness ?

I understand Kernel should manage this , so do I need to clean up manually ?

Please suggest
 

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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)
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