EM 13c: Incorrect Memory Utilization Reported for Linux Hosts in Enterprise Manager 18.104.22.168.0 Cloud Control
(Doc ID 2144976.1)
Last updated on OCTOBER 15, 2020
Applies to:Enterprise Manager Base Platform - Version 22.214.171.124.0 and later
Information in this document applies to any platform.
Enterprise Manager (EM) 126.96.36.199.0 Cloud Control
Incorrect Memory utilization % is displayed in the Linux x86_64 Target Host's Home page and possible frequent incorrect alerts and emails could be generated for Memory Utilization (%) exceeding thresholds.
The Memory Utilization (%) metric does not consider the Buffers or Cache memory components available for the metric computation.
While the total Memory available in the host target is displayed correctly after applying the latest PSU # 23030165 (Agent-Side 188.8.131.52.160429), the formula used for Memory Utilization is (100.0 * (realMem-freeMem) / realMem) and does not consider Buffers / Cached component for the calculation. The formula used by EM 13.1 needs correction.
In the meminfo output graphic above, the Memory Utilization (%) is calculated as:
100*(MemTotal - MemFree)/MemTotal = 100*(14973552 - 550468)/14973552 = 96%
This is in agreement with what EM shows in the Memory Utilization display on the Host target main page.
The Cached and Buffers components are also available to the application, so the actual Memory Utilization (%) should be lower, calculated as:
100*(MemTotal - MemFree - Buffers - Cached)/MemTotal = 100*(14973552 - 550468 - 284460 - 8074660)/14973552 = 40%
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