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Top Forums UNIX for Advanced & Expert Users Linux Virtual Memory Question Post 302544672 by jaysunn on Thursday 4th of August 2011 01:20:11 PM
Old 08-04-2011
Linux Virtual Memory Question

Hello,
I am trying to understand the VIRT field that shows in the TOP command output. I have a users application that appears to be leaking memory. I see that the field VIRT in the top output is showing 55.8g.

The question is where is that getting stored? The disk does not appear to have that much space used on it. An the system only has 24GB of ram. Is this a combination of RAM and DISK? Here is some examples.

Code:
[root@MWET66 ~]# df -kh
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              64G   22G   40G  36% /
/dev/sda1              99M   12M   83M  13% /boot
tmpfs                  12G     0   12G   0% /dev/shm

Code:
top - 12:36:53 up 21:13,  2 users,  load average: 0.18, 0.28, 0.22
Tasks: 171 total,   1 running, 170 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.6%us,  0.0%sy,  0.0%ni, 99.2%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:  24675472k total, 23320044k used,  1355428k free,    13912k buffers
Swap:  2096472k total,  2096472k used,        0k free,   195040k cached
PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                                                         
24797 user   18   0 55.8g  21g 121m S  5.0 92.7  22:59.38 application

Any help would be appreciated.

jaysunn
 

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SYSTEMD-DETECT-VIRT(1)                                          systemd-detect-virt                                         SYSTEMD-DETECT-VIRT(1)

NAME
systemd-detect-virt - Detect execution in a virtualized environment SYNOPSIS
systemd-detect-virt [OPTIONS...] DESCRIPTION
systemd-detect-virt detects execution in a virtualized environment. It identifies the virtualization technology and can distinguish full machine virtualization from container virtualization. systemd-detect-virt exits with a return value of 0 (success) if a virtualization technology is detected, and non-zero (error) otherwise. By default, any type of virtualization is detected, and the options --container and --vm can be used to limit what types of virtualization are detected. When executed without --quiet will print a short identifier for the detected virtualization technology. The following technologies are currently identified: Table 1. Known virtualization technologies (both VM, i.e. full hardware virtualization, and container, i.e. shared kernel virtualization) +----------+----------------+--------------------------------------+ |Type | ID | Product | +----------+----------------+--------------------------------------+ |VM | qemu | QEMU software virtualization, | | | | without KVM | | +----------------+--------------------------------------+ | | kvm | Linux KVM kernel virtual machine, | | | | with whatever software, except | | | | Oracle Virtualbox | | +----------------+--------------------------------------+ | | zvm | s390 z/VM | | +----------------+--------------------------------------+ | | vmware | VMware Workstation or Server, and | | | | related products | | +----------------+--------------------------------------+ | | microsoft | Hyper-V, also known as Viridian or | | | | Windows Server Virtualization | | +----------------+--------------------------------------+ | | oracle | Oracle VM VirtualBox (historically | | | | marketed by innotek and Sun | | | | Microsystems), | | | | for legacy and KVM | | | | hypervisor | | +----------------+--------------------------------------+ | | xen | Xen hypervisor (only domU, not dom0) | | +----------------+--------------------------------------+ | | bochs | Bochs Emulator | | +----------------+--------------------------------------+ | | uml | User-mode Linux | | +----------------+--------------------------------------+ | | parallels | Parallels Desktop, Parallels Server | | +----------------+--------------------------------------+ | | bhyve | bhyve, FreeBSD hypervisor | +----------+----------------+--------------------------------------+ |Container | openvz | OpenVZ/Virtuozzo | | +----------------+--------------------------------------+ | | lxc | Linux container implementation by | | | | LXC | | +----------------+--------------------------------------+ | | lxc-libvirt | Linux container implementation by | | | | libvirt | | +----------------+--------------------------------------+ | | systemd-nspawn | systemd's minimal container | | | | implementation, see systemd- | | | | nspawn(1) | | +----------------+--------------------------------------+ | | docker | Docker container manager | | +----------------+--------------------------------------+ | | rkt | rkt app container runtime | +----------+----------------+--------------------------------------+ If multiple virtualization solutions are used, only the "innermost" is detected and identified. That means if both machine and container virtualization are used in conjunction, only the latter will be identified (unless --vm is passed). OPTIONS
The following options are understood: -c, --container Only detects container virtualization (i.e. shared kernel virtualization). -v, --vm Only detects hardware virtualization). -r, --chroot Detect whether invoked in a chroot(2) environment. In this mode, no output is written, but the return value indicates whether the process was invoked in a chroot() environment or not. --private-users Detect whether invoked in a user namespace. In this mode, no output is written, but the return value indicates whether the process was invoked inside of a user namespace or not. See user_namespaces(7) for more information. -q, --quiet Suppress output of the virtualization technology identifier. -h, --help Print a short help text and exit. --version Print a short version string and exit. EXIT STATUS
If a virtualization technology is detected, 0 is returned, a non-zero code otherwise. SEE ALSO
systemd(1), systemd-nspawn(1), chroot(2), namespaces(7) systemd 237 SYSTEMD-DETECT-VIRT(1)
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