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选题: 20190212 How To Check CPU, Memory And Swap Utilization Percentage…
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How To Check CPU, Memory And Swap Utilization Percentage In Linux?)
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[#]: via: (https://www.2daygeek.com/linux-check-cpu-memory-swap-utilization-percentage/)
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[#]: author: (Vinoth Kumar https://www.2daygeek.com/author/vinoth/)
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How To Check CPU, Memory And Swap Utilization Percentage In Linux?
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======
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There is a lot of commands and options are available in Linux to check memory utilization but i don’t see much information to check about memory utilization percentage.
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Most of the times we are checking memory utilization alone and we won’t think about how much percentage is used.
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If you want to know those information then you are in the right page.
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We are here to help you out on this in details.
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This tutorial will help you to identify the memory utilization when you are facing high memory utilization frequently in Linux server.
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But the same time, you won’t be getting the clear utilization if you are using `free -m` or `free -g`.
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These format commands fall under Linux advanced commands. It will be very useful for Linux Experts and Middle Level Linux Users.
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### Method-1: How To Check Memory Utilization Percentage In Linux?
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We can use the following combination of commands to get this done. In this method, we are using combination of free and awk command to get the memory utilization percentage.
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If you are looking for other articles which is related to memory then navigate to the following link. Those are **[free Command][1]** , **[smem Command][2]** , **[ps_mem Command][3]** , **[vmstat Command][4]** and **[Multiple ways to check size of physical memory][5]**.
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For `Memory` Utilization Percentage without Percent Symbol:
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```
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$ free -t | awk 'NR == 2 {print "Current Memory Utilization is : " $3/$2*100}'
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or
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$ free -t | awk 'FNR == 2 {print "Current Memory Utilization is : " $3/$2*100}'
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Current Memory Utilization is : 20.4194
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```
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For `Swap` Utilization Percentage without Percent Symbol:
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```
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$ free -t | awk 'NR == 3 {print "Current Swap Utilization is : " $3/$2*100}'
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or
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$ free -t | awk 'FNR == 3 {print "Current Swap Utilization is : " $3/$2*100}'
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Current Swap Utilization is : 0
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```
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For `Memory` Utilization Percentage with Percent Symbol and two decimal places:
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```
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$ free -t | awk 'NR == 2 {printf("Current Memory Utilization is : %.2f%"), $3/$2*100}'
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or
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$ free -t | awk 'FNR == 2 {printf("Current Memory Utilization is : %.2f%"), $3/$2*100}'
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Current Memory Utilization is : 20.42%
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```
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For `Swap` Utilization Percentage with Percent Symbol and two decimal places:
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```
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$ free -t | awk 'NR == 3 {printf("Current Swap Utilization is : %.2f%"), $3/$2*100}'
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or
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$ free -t | awk 'FNR == 3 {printf("Current Swap Utilization is : %.2f%"), $3/$2*100}'
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Current Swap Utilization is : 0.00%
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```
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If you are looking for other articles which is related to memory then navigate to the following link. Those are **[Create/Extend Swap Partition using LVM][6]** , **[Multiple Ways To Create Or Extend Swap Space][7]** and **[Shell Script to automatically Create/Remove and Mount Swap File][8]**.
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free command output for better clarification:
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```
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$ free
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total used free shared buff/cache available
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Mem: 15867 3730 9868 1189 2269 10640
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Swap: 17454 0 17454
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Total: 33322 3730 27322
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```
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Details are follow:
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* **`free:`** free is a standard command to check memory utilization in Linux.
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* **`awk:`** awk is a powerful command which is specialized for textual data manipulation.
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* **`FNR == 2:`** It gives the total number of records for each input file. Basically it’s used to select the given line (Here, it chooses the line number 2).
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* **`NR == 2:`** It gives the total number of records processed. Basically it’s used to filter the given line (Here, it chooses the line number 2)..
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* **`$3/$2*100:`** It divides column 2 with column 3 and it’s multiply the results with 100.
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* **`printf:`** It used to format and print data.
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* **`%.2f%:`** By default it prints floating point numbers with 6 decimal places. Use the following format to limit a decimal places.
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### Method-2: How To Check Memory Utilization Percentage In Linux?
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We can use the following combination of commands to get this done. In this method, we are using combination of free, grep and awk command to get the memory utilization percentage.
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For `Memory` Utilization Percentage without Percent Symbol:
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```
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$ free -t | grep Mem | awk '{print "Current Memory Utilization is : " $3/$2*100}'
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Current Memory Utilization is : 20.4228
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```
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For `Swap` Utilization Percentage without Percent Symbol:
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```
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$ free -t | grep Swap | awk '{print "Current Swap Utilization is : " $3/$2*100}'
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Current Swap Utilization is : 0
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```
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For `Memory` Utilization Percentage with Percent Symbol and two decimal places:
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```
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$ free -t | grep Mem | awk '{printf("Current Memory Utilization is : %.2f%"), $3/$2*100}'
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Current Memory Utilization is : 20.43%
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```
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For `Swap` Utilization Percentage with Percent Symbol and two decimal places:
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```
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$ free -t | grep Swap | awk '{printf("Current Swap Utilization is : %.2f%"), $3/$2*100}'
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Current Swap Utilization is : 0.00%
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```
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### Method-1: How To Check CPU Utilization Percentage In Linux?
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We can use the following combination of commands to get this done. In this method, we are using combination of top, print and awk command to get the CPU utilization percentage.
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If you are looking for other articles which is related to memory then navigate to the following link. Those are **[top Command][9]** , **[htop Command][10]** , **[atop Command][11]** and **[Glances Command][12]**.
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If it shows multiple CPU in the output then you need to use the following method.
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```
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$ top -b -n1 | grep ^%Cpu
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%Cpu0 : 5.3 us, 0.0 sy, 0.0 ni, 94.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu1 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu2 : 0.0 us, 0.0 sy, 0.0 ni, 94.7 id, 0.0 wa, 0.0 hi, 5.3 si, 0.0 st
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%Cpu3 : 5.3 us, 0.0 sy, 0.0 ni, 94.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu4 : 10.5 us, 15.8 sy, 0.0 ni, 73.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu5 : 0.0 us, 5.0 sy, 0.0 ni, 95.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu6 : 5.3 us, 0.0 sy, 0.0 ni, 94.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu7 : 5.3 us, 0.0 sy, 0.0 ni, 94.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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```
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For `CPU` Utilization Percentage without Percent Symbol:
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```
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$ top -b -n1 | grep ^%Cpu | awk '{cpu+=$9}END{print "Current CPU Utilization is : " 100-cpu/NR}'
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Current CPU Utilization is : 21.05
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```
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For `CPU` Utilization Percentage with Percent Symbol and two decimal places:
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```
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$ top -b -n1 | grep ^%Cpu | awk '{cpu+=$9}END{printf("Current CPU Utilization is : %.2f%"), 100-cpu/NR}'
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Current CPU Utilization is : 14.81%
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```
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### Method-2: How To Check CPU Utilization Percentage In Linux?
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We can use the following combination of commands to get this done. In this method, we are using combination of top, print/printf and awk command to get the CPU utilization percentage.
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If it shows all together CPU(s) in the single output then you need to use the following method.
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```
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$ top -b -n1 | grep ^%Cpu
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%Cpu(s): 15.3 us, 7.2 sy, 0.8 ni, 69.0 id, 6.7 wa, 0.0 hi, 1.0 si, 0.0 st
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```
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For `CPU` Utilization Percentage without Percent Symbol:
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```
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$ top -b -n1 | grep ^%Cpu | awk '{print "Current CPU Utilization is : " 100-$8}'
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Current CPU Utilization is : 5.6
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```
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For `CPU` Utilization Percentage with Percent Symbol and two decimal places:
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```
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$ top -b -n1 | grep ^%Cpu | awk '{printf("Current CPU Utilization is : %.2f%"), 100-$8}'
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Current CPU Utilization is : 5.40%
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```
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Details are follow:
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* **`top:`** top is one of the best command to check currently running process on Linux system.
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* **`-b:`** -b option, allow the top command to switch in batch mode. It is useful when you run the top command from local system to remote system.
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* **`-n1:`** Number-of-iterations
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* **`^%Cpu:`** Filter the lines which starts with %Cpu
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* **`awk:`** awk is a powerful command which is specialized for textual data manipulation.
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* **`cpu+=$9:`** For each line, add column 9 to a variable ‘cpu’.
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* **`printf:`** It used to format and print data.
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* **`%.2f%:`** By default it prints floating point numbers with 6 decimal places. Use the following format to limit a decimal places.
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* **`100-cpu/NR:`** Finally print the ‘CPU Average’ by subtracting 100, divided by the number of records.
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-check-cpu-memory-swap-utilization-percentage/
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作者：[Vinoth Kumar][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/vinoth/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/free-command-to-check-memory-usage-statistics-in-linux/
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[2]: https://www.2daygeek.com/smem-linux-memory-usage-statistics-reporting-tool/
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[3]: https://www.2daygeek.com/ps_mem-report-core-memory-usage-accurately-in-linux/
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[4]: https://www.2daygeek.com/linux-vmstat-command-examples-tool-report-virtual-memory-statistics/
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[5]: https://www.2daygeek.com/easy-ways-to-check-size-of-physical-memory-ram-in-linux/
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[6]: https://www.2daygeek.com/how-to-create-extend-swap-partition-in-linux-using-lvm/
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[7]: https://www.2daygeek.com/add-extend-increase-swap-space-memory-file-partition-linux/
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[8]: https://www.2daygeek.com/shell-script-create-add-extend-swap-space-linux/
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[9]: https://www.2daygeek.com/linux-top-command-linux-system-performance-monitoring-tool/
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[10]: https://www.2daygeek.com/linux-htop-command-linux-system-performance-resource-monitoring-tool/
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[11]: https://www.2daygeek.com/atop-system-process-performance-monitoring-tool/
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[12]: https://www.2daygeek.com/install-glances-advanced-real-time-linux-system-performance-monitoring-tool-on-centos-fedora-ubuntu-debian-opensuse-arch-linux/
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