EM 13c: Incorrect Memory Utilization Reported for Linux Hosts in Enterprise Manager 13.1.0.0.0 Cloud Control (Doc ID 2144976.1)

Last updated on OCTOBER 15, 2020

Applies to:

Symptoms

Enterprise Manager (EM) 13.1.0.0.0 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 13.1.0.0.160429), 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%

Cause

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