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So, I have a cPanel access. In the cPanel statistic, I see that my Physical Memory Usage is 2 GB and almost full.

Physical Memory Usage in cPanel

When I go to terminal and run free -m I got this:

 total used free shared buffers cached Mem: 257680 232988 24692 10514 26825 152897 -/+ buffers/cache: 53265 204415 Swap: 7811 0 7811

As we can see, the total physical memory is around 257 GB, then I assume maybe because it is the memory of the real computer (not only for my hosting server)

Then, I tried to run top command:

top - 16:37:43 up 118 days, 9:51, 3 users, load average: 16.32, 15.80, 18.41 Tasks: 4 total, 1 running, 3 sleeping, 0 stopped, 0 zombie Cpu(s): 20.6%us, 7.4%sy, 1.1%ni, 70.2%id, 0.1%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 263865228k total, 239103188k used, 24762040k free, 27469784k buffers Swap: 7999484k total, 0k used, 7999484k free, 156720680k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 120795 linkjxsl 20 0 113m 1984 824 S 0.0 0.0 0:00.02 sshd 120865 linkjxsl 20 0 106m 1896 1520 S 0.0 0.0 0:00.02 bash 160395 linkjxsl 20 0 368m 21m 14m S 0.0 0.0 0:00.08 lsphp 169137 linkjxsl 20 0 15264 1036 844 R 0.0 0.0 0:00.00 top

And I got that. As we can see, the total memory is still around 263 GB.

But if I sum the virtual VIRT, it is around 600 MB only. The value here is not represents both the value in free -m, header on top, and even the cPanel statistic.

What am I missing here?

In addition here is the result when I run cat /proc/meminfo:

MemTotal: 263865228 kB MemFree: 17284772 kB Buffers: 27660140 kB Cached: 164416712 kB SwapCached: 0 kB MemCommitted: 2752512000 kB VirtualSwap: 0 kB Active: 129285076 kB Inactive: 78478928 kB Active(anon): 19536976 kB Inactive(anon): 6643612 kB Active(file): 109748100 kB Inactive(file): 71835316 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 7999484 kB SwapFree: 7999484 kB Dirty: 23220 kB Writeback: 12 kB AnonPages: 15683704 kB Mapped: 2369172 kB Shmem: 10493380 kB Slab: 37522684 kB SReclaimable: 35520504 kB SUnreclaim: 2002180 kB KernelStack: 38160 kB PageTables: 368772 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 139932096 kB Committed_AS: 59309828 kB VmallocTotal: 34359738367 kB VmallocUsed: 1019032 kB VmallocChunk: 34225288092 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 7168 kB DirectMap2M: 2019328 kB DirectMap1G: 266338304 kB

Thanks

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If this is Cloudlinux cPanel the physical memory might be being taken up by the users disk cache as noted here.

You can check your disk cache by doing the following where XXX is your user ID and looking for Cached: value.

cat /proc/bc/XXX/meminfo

To get your user id all you need to do is id username where 'username' is your username (eg id root, id cpanelusername, id apache, etc...) and this will give you a numerical ID to replace the XXX with.

CloudLinux Docs Reference, ZenDesk KB Reference

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  • I can't find bc directory inside /proc/.. Though I'm not sure it is using Cloudlinux cPanel.. Commented Sep 9, 2018 at 17:38

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