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Top Forums UNIX for Advanced & Expert Users Linux Virtual Memory Question Post 302559634 by jlliagre on Tuesday 27th of September 2011 06:16:26 PM
Old 09-27-2011
Quote:
Originally Posted by Corona688
Virtual memory is virtual. If the application doesn't actually use it, it doesn't get stored anywhere at all.
You might be confusing with allocated memory.
Virtual memory as reported by top is the sum of memory present either on disk (mostly SWAP) or on RAM (RES).
 

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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 VM virtualization from container virtualization. When executed without --quiet will print a short identifier for the detected virtualization technology. The following technologies are currently identified: qemu, kvm, vmware, microsoft, oracle, xen, bochs, chroot, uml, openvz, lxc, lxc-libvirt, systemd-nspawn. If multiple virtualization solutions are used, only the "innermost" is detected and identified. That means if both VM virtualization and container virtualization are used in conjunction, only the latter will be identified (unless --vm is passed). OPTIONS
The following options are understood: -h, --help Prints a short help text and exits. --version Prints a short version string and exits. -c, --container Only detects container virtualization (i.e. shared kernel virtualization). -v, --vm Only detects VM virtualization (i.e. full hardware virtualization). -q, --quiet Suppress output of the virtualization technology identifier. EXIT STATUS
If a virtualization technology is detected, 0 is returned, a non-zero code otherwise. SEE ALSO
systemd(1) systemd 208 SYSTEMD-DETECT-VIRT(1)
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