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Full Discussion: Linux Virtual Memory Question
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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LEARN ABOUT CENTOS

virt-sanlock-cleanup

VIRT-SANLOCK-CLEANUP(8) 				      Virtualization Support					   VIRT-SANLOCK-CLEANUP(8)

NAME

	 virt-sanlock-cleanup - remove stale sanlock resource lease files

SYNOPSIS

	 virt-sanlock-cleanup

DESCRIPTION

       This tool removes any resource lease files created by the sanlock lock manager plugin. The resource lease files only need to exist on disks
       when a guest using the resource is active. This script reclaims the disk space used by resources which are not currently active.

EXIT STATUS

       Upon successful processing of leases cleanup, an exit status of 0 will be set. Upon fatal error a non-zero status will be set.

AUTHOR

       Daniel Berrange

BUGS

       Report any bugs discovered to the libvirt community via the mailing list "http://libvirt.org/contact.html" or bug tracker
       "http://libvirt.org/bugs.html".	Alternatively report bugs to your software distributor / vendor.

COPYRIGHT

       Copyright (C) 2011, 2013 Red Hat, Inc.

LICENSE

       virt-sanlock-cleanup is distributed under the terms of the GNU GPL v2+.	This is free software; see the source for copying conditions.
       There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE

SEE ALSO

       virsh(1), online instructions "http://libvirt.org/locking.html"

libvirt-1.1.1							    2013-05-27						   VIRT-SANLOCK-CLEANUP(8)
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