Memory Usage Calculation (Linux- Telnet/SSH)
Physical Memory Utilization Calculation:
Note: For version 16800 and above , the Skip option will be under Settings -> Performance Polling -> Servers -> Linux monitor type.
Formula:
Formula:
(i) If Skip buffer and cache from monitoring (Applicable only for linux) option under Settings -> Performance Polling -> Servers Tab is not enabled. [By default, this option is not enabled]
Memory Utilization (%) = 100 -(((MemFree + Buffers + Cached)*100)/maxValue)
Memory Utilization (MB) = maxValue-(MemFree + Buffers + Cached)
(ii) If Skip buffer and cache from monitoring (Applicable only for linux) option under Settings -> Performance Polling -> Servers Tab is enabled.
Memory Utilization (%) = 100 - ((MemFree *100)/maxValue)
Memory Utilization (MB) = maxValue - MemFree
In Telnet/SSH mode:
testuser@testmachine:~$ free -b
total used free shared buff/cache available
Mem: 12361719808 8122318848 274104320 370192384 3965296640 3541422080
Swap: 32212250624 4870012928 27342237696
MemFree corresponds to Mem:free
Buffers + Cached corresponds to Mem:buff/cache
maxValue corresponds to Mem:total
(i) If Skip buffer and cache from monitoring (Applicable only for linux) option under Settings -> Performance Polling -> Servers Tab is not enabled.
Memory Utilization (%) = 100 -(((MemFree + Buffers + Cached)*100)/maxValue)
= 100 -(((274104320 + 3965296640)*100)/12361719808)
= 65.705411336 = 65 %
Memory Utilization (MB) = maxValue-(MemFree + Buffers + Cached)
= 12361719808 - (274104320+3965296640)
= 8122318848/(1024*1024)
= 7746 MB
(ii) If Skip buffer and cache from monitoring (Applicable only for linux) option under Settings -> Performance Polling -> Servers Tab is enabled.
Memory Utilization (%) = 100 - ((MemFree *100)/maxValue)
= 100 - ((274104320 *100)/12361719808)
= 97.782636039 = 97%
Memory Utilization (MB) = maxValue - MemFree
= 12361719808 - 274104320
= 12087615488/(1024*1024)
= 11527 MB
Swap Memory Utilization:
Used % = ( used_swap / total_swap ) *100
= ( 4870012928/ 32212250624) * 100
= 15 %
Total Memory Utilization
total_used = used_mem + used_swap
= 6817 + 0
= 6817
Total used % = ( ( total_used ) / ( total_mem + total_swap ) ) * 100);
= ( ( 6817) / ( 15726 + 30719 ) ) * 100
= 14 %
New to ADSelfService Plus?
Related Articles
Available memory (%) for Linux Servers in SSH/Telnet mode
The "available" memory value is used to determine the amount of memory that can be allocated to new processes without triggering excessive swapping or performance degradation. It provides an estimate of how much memory is readily accessible for use. ...How is Memory Utilization calculated for Linux server?
Note: For version 16800 and above , the Skip option will be under Settings -> Performance Polling -> Servers -> Linux monitor type. Formula: (i) If Skip buffer and cache from monitoring (Applicable only for linux) option under Settings -> Performance ...Applications Manager is not fetching Memory Utilization and Disk Utilization data in Telnet or SSH mode for servers (Windows, Linux, AIX, HP-UX, FreeBSD).
The data for Memory and Disk utilization may not be shown due to the problem in executing and obtaining the output of the commands on the server. For different modes of monitoring (WMI/Telnet/SSH/SNMP) we use different methods to collect data. Below ...Performance data not collected for Linux monitor with RHEL 8 & above in SSH mode
If you notice an issue regarding the performance data collection for the Linux monitor with RHEL 8 & above (No data in GUI) then from the Applications Manager GUI --> Admin --> Product Settings --> Logging --> choose Print all logs option and save ...How to troubleshoot when having error 'No data available' for Memory Usage?
Problem: "No data available" message shown for Memory Usage while trying to monitor Linux servers. Solution: The connection must be established only through TELNET or SSH mode. Check whether the below command runs and displays the corresponding ...