How is Memory Utilization calculated for Linux server?
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
In SNMP mode:
The UCD-SNMP-MIB file is used to get the memory usage for Linux servers.
Total Memory .1.3.6.1.4.1.2021.4.5.0
Free Memory .1.3.6.1.4.1.2021.4.6.0
Buffer Memory .1.3.6.1.4.1.2021.4.14.0
Cached Memory .1.3.6.1.4.1.2021.4.15.0
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