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sources/tech/20190905 How to Get Average CPU and Memory Usage from SAR Reports Using the Bash Script.md
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How to Get Average CPU and Memory Usage from SAR Reports Using the Bash Script
Most Linux administrator monitor system performance with SAR report because it collect performance data for a week.
But you can easily extend this to four weeks by making changes to the “/etc/sysconfig/sysstat” file.
Also, this period can be extended beyond one month. If the value exceeds 28, the log files are placed in multiple directories, one for each month.
To extend the coverage period to 28 days, make the following change to the “/etc/sysconfig/sysstat” file.
Edit the sysstat file and change HISTORY=7 to HISTORY=28.
In this article we have added three bash scripts that will help you to easily view each data file averages in one place.
We have added many useful shell scripts in the past. If you want to check out that collection, go to the link below.
These scripts are simple and straightforward. For testing purposes, we have included only two performance metrics, namely CPU and memory.
You can modify other performance metrics in the script to suit your needs.
Script-1: Bash Script to Get Average CPU Utilization from SAR Reports
This bash script collects the CPU average from each data file and display it on one page.
Since this is a month end, it shows 28 days data for August 2019.
# vi /opt/scripts/sar-cpu-avg.sh
#!/bin/sh
echo "+----------------------------------------------------------------------------------+"
echo "|Average: CPU %user %nice %system %iowait %steal %idle |"
echo "+----------------------------------------------------------------------------------+"
for file in `ls -tr /var/log/sa/sa* | grep -v sar`
do
dat=`sar -f $file | head -n 1 | awk '{print $4}'`
echo -n $dat
sar -f $file | grep -i Average | sed "s/Average://"
done
echo "+----------------------------------------------------------------------------------+"
Once you run the script, you will get an output like the one below.
# sh /opt/scripts/sar-cpu-avg.sh
+----------------------------------------------------------------------------------+
|Average: CPU %user %nice %system %iowait %steal %idle |
+----------------------------------------------------------------------------------+
08/01/2019 all 0.70 0.00 1.19 0.00 0.00 98.10
08/02/2019 all 1.73 0.00 3.16 0.01 0.00 95.10
08/03/2019 all 1.73 0.00 3.16 0.01 0.00 95.11
08/04/2019 all 1.02 0.00 1.80 0.00 0.00 97.18
08/05/2019 all 0.68 0.00 1.08 0.01 0.00 98.24
08/06/2019 all 0.71 0.00 1.17 0.00 0.00 98.12
08/07/2019 all 1.79 0.00 3.17 0.01 0.00 95.03
08/08/2019 all 1.78 0.00 3.14 0.01 0.00 95.08
08/09/2019 all 1.07 0.00 1.82 0.00 0.00 97.10
08/10/2019 all 0.38 0.00 0.50 0.00 0.00 99.12
.
.
.
08/29/2019 all 1.50 0.00 2.33 0.00 0.00 96.17
08/30/2019 all 2.32 0.00 3.47 0.01 0.00 94.20
+----------------------------------------------------------------------------------+
Script-2: Bash Script to Get Average Memory Utilization from SAR Reports
This bash script will collect memory averages from each data file and display it on one page.
Since this is a month end, it shows 28 days data for August 2019.
# vi /opt/scripts/sar-memory-avg.sh
#!/bin/sh
echo "+-------------------------------------------------------------------------------------------------------------------+"
echo "|Average: kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty |"
echo "+-------------------------------------------------------------------------------------------------------------------+"
for file in `ls -tr /var/log/sa/sa* | grep -v sar`
do
dat=`sar -f $file | head -n 1 | awk '{print $4}'`
echo -n $dat
sar -r -f $file | grep -i Average | sed "s/Average://"
done
echo "+-------------------------------------------------------------------------------------------------------------------+"
Once you run the script, you will get an output like the one below.
# sh /opt/scripts/sar-memory-avg.sh
+--------------------------------------------------------------------------------------------------------------------+
|Average: kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty |
+--------------------------------------------------------------------------------------------------------------------+
08/01/2019 1492331 2388461 61.55 29888 1152142 1560615 12.72 1693031 380472 6
08/02/2019 1493126 2387666 61.53 29888 1147811 1569624 12.79 1696387 373346 3
08/03/2019 1489582 2391210 61.62 29888 1147076 1581711 12.89 1701480 370325 3
08/04/2019 1490403 2390389 61.60 29888 1148206 1569671 12.79 1697654 373484 4
08/05/2019 1484506 2396286 61.75 29888 1152409 1563804 12.75 1702424 374628 4
08/06/2019 1473593 2407199 62.03 29888 1151137 1577491 12.86 1715426 371000 8
08/07/2019 1467150 2413642 62.19 29888 1155639 1596653 13.01 1716900 372574 13
08/08/2019 1451366 2429426 62.60 29888 1162253 1604672 13.08 1725931 376998 5
08/09/2019 1451191 2429601 62.61 29888 1158696 1582192 12.90 1728819 371025 4
08/10/2019 1450050 2430742 62.64 29888 1160916 1579888 12.88 1729975 370844 5
.
.
.
08/29/2019 1365699 2515093 64.81 29888 1198832 1593567 12.99 1781733 376157 15
08/30/2019 1361920 2518872 64.91 29888 1200785 1595105 13.00 1784556 375641 8
+-------------------------------------------------------------------------------------------------------------------+
Script-3: Bash Script to Get Average CPU & Memory Utilization from SAR Reports
This bash script collects the CPU & memory averages from each data file and displays them on a page.
This bash script is slightly different compared to the above script. It shows the average of both (CPU & Memory) in one location, not the other data.
# vi /opt/scripts/sar-cpu-mem-avg.sh
#!/bin/bash
for file in `ls -tr /var/log/sa/sa* | grep -v sar`
do
sar -f $file | head -n 1 | awk '{print $4}'
echo "-----------"
sar -u -f $file | awk '/Average:/{printf("CPU Average: %.2f%\n"), 100 - $8}'
sar -r -f $file | awk '/Average:/{printf("Memory Average: %.2f%\n"),(($3-$5-$6)/($2+$3)) * 100 }'
printf "\n"
done
Once you run the script, you will get an output like the one below.
# sh /opt/scripts/sar-cpu-mem-avg.sh
08/01/2019
-----------
CPU Average: 1.90%
Memory Average: 31.09%
08/02/2019
-----------
CPU Average: 4.90%
Memory Average: 31.18%
08/03/2019
-----------
CPU Average: 4.89%
Memory Average: 31.29%
08/04/2019
-----------
CPU Average: 2.82%
Memory Average: 31.24%
08/05/2019
-----------
CPU Average: 1.76%
Memory Average: 31.28%
.
.
.
08/29/2019
-----------
CPU Average: 3.83%
Memory Average: 33.15%
08/30/2019
-----------
CPU Average: 5.80%
Memory Average: 33.19%
via: https://www.2daygeek.com/linux-get-average-cpu-memory-utilization-from-sar-data-report/
作者：Magesh Maruthamuthu 选题：lujun9972 译者：译者ID 校对：校对者ID