How Physical memory is calculated in CDM probe
Article ID: 197727
Updated On:
Products
Issue/Introduction
We received the attached alarm from UIM, when we checked on server we got below output
# cat /proc/meminfo
MemTotal: 32847836 kB
MemFree: 182980 kB
MemAvailable: 11598284 kB
Buffers: 0 kB
Cached: 982728 kB
SwapCached: 0 kB
Active: 19578128 kB
Inactive: 567528 kB
Active(anon): 19163984 kB
Inactive(anon): 240 kB
Active(file): 414144 kB
Inactive(file): 567288 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 176 kB
Writeback: 0 kB
AnonPages: 19162928 kB
Mapped: 63656 kB
Shmem: 1296 kB
Slab: 12159580 kB
SReclaimable: 10658356 kB
SUnreclaim: 1501224 kB
KernelStack: 8928 kB
PageTables: 47720 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 16423916 kB
Committed_AS: 19296832 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 204084 kB
VmallocChunk: 34359341052 kB
HardwareCorrupted: 0 kB
AnonHugePages: 7002112 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 147328 kB
DirectMap2M: 8241152 kB
DirectMap1G: 27262976 kB
Environment
- Release: Any
- Component: UIM - CDM WITH IOSTAT
- cdm 6.50 o higher
Resolution
The amount of physical memory used is based on the formula:
MemTotal - MemFree - Buffers – Cached. This is because buffers and cached data are instantly available to any process which requests more memory.
As per your data:
32847836 - 182920 - 0 - 982728 which equals-> 31,682,188.
31,682,188 divided by 32847836 is .9645137049515225 which is approx. 96%
Note that you will very likely see a small difference in the values in meminfo and the QOS metric. Memory usage is a constantly shifting value and the probe will have collected data at a slightly different time to when you viewed the meminfo file.
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