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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sadc(8) BSD System Manager's Manual sadc(8)
NAME
sadc -- system activity data collector
SYNOPSIS
/usr/lib/sa/sadc [-m mode] [t n] [ofile]
DESCRIPTION
The sadc tool is used to collect cumulative system activity data. The sample system data is collected at intervals t seconds apart, in a
loop n times. The binary sample data is written to ofile if specified. Otherwise, the binary data is written to stdout. If the ofile file
does not exist, it is created, otherwise it is truncated.
sadc is intended to be used as the engine behind the sar(1) command, and is not typically invoked on the command line. Two shell scripts,
sa1 and sa2, are provided to drive the typical sampling, saving, and reporting process.
OPTIONS
The following options modify the way data is collected by sadc.
-m mode Modify the collection of system statistics as specified by mode. Currently only one mode is supported.
PPP By default, the collection of ppp network interface statistics is turned off. This is because the number of ppp connec-
tions can be very high, causing the raw data file to grow unexpectedly large, especially when samples are collected at
short intervals. Use the PPP mode to turn the collection back on.
EXAMPLES
/usr/lib/sa/sadc 15 20 /tmp/sample.out
This call collects 20 samples at 15 second intervals. The binary data is written to the /tmp/sample.out file
FILES
/var/log/sa/sadd Default daily activity file that holds the binary sampling data. dd are digits that represent the day of the month.
/usr/lib/sa/sa1 Shell script used to drive the sar data collection.
/usr/lib/sa/sa2 Shell script used to drive the sar data reporting.
SEE ALSO
fs_usage(1), netstat(1), sar(1), sc_usage(1), top(1), vm_stat(1), iostat(8), sa1(8), sa2(8)
Mac OS X Jul 25 2003 Mac OS X