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Operating Systems Linux Memory issue on My CentOS 5.8 x64 bit server Post 302770808 by DGPickett on Monday 18th of February 2013 12:10:03 PM
Old 02-18-2013
Under VM, not dirty pages stay mapped in case anyone wants to read them through a mmap(). If you need a page, they can be taken, but they are not free. You can run a job that mmap()'s a file, read the whole file into ram, exit, run it again, and when it mmap()s the file again, the old pages are mapped into the new process memory range and it runs much faster. This is what happens with libc.so: everyone runs printf() from the same ram page.
 

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OSINFO-QUERY.C(1)					      Virtualization Support						 OSINFO-QUERY.C(1)

NAME
osinfo-query - Query information in the database SYNOPSIS
osinfo-query [OPTIONS...] TYPE [CONDITION-1 [CONDITION-2 ...]] DESCRIPTION
The "osinfo-query" command allows extraction of information from the database. TYPE can be one of "os", "platform", "device", or "deployment". With no conditions specified, all entities of the given type will be listed. # List all operating systems $ osinfo-query os Short ID | Name ... ----------------------+----------- centos-6.0 | CentOS 6.0 ... centos-6.1 | CentOS 6.1 ... ... Conditions allow filtering based on specific properties of an entity. For example, to filter only distros from the Fedora Project, use # List all operating systems $ osinfo-query os vendor="Fedora Project" Short ID | Name ... ----------------------+-------------- fedora1 | Fedora Core 1 ... fedora2 | Fedora Core 2 ... ... The set of fields which are printed can be controlled using the "--fields" command line argument: # List all operating systems $ osinfo-query --fields=short-id,version os vendor="Fedora Project" Short ID | Version ----------------------+---------- fedora1 | 1 fedora2 | 2 ... OPTIONS
-s PROPERTY, --sort-key PROPERTY Set the data sorting key. Defaults sorting the first column -f PROPERTY1,PROPERTY2,..., --fields PROPERTY1,PROPERTY2,... Set the visibility of properties in output PROPERTY NAMES
OS Valid property names for the "os" type are: short-id The short OS identifier name The long OS name version The OS version string family The OS kernel family vendor The OS vendor release-date The OS release date eol-date The OS end-of-life date codename The OS code name id The OS identifier PLATFORM Valid property names for the "platform" type are: short-id The short platform identifier name The long platform name version The platform version string vendor The platform vendor release-date The platform release date eol-date The platform end-of-life date codename The platform code name id The platform identifier DEVICE Valid property names for the "device" type are: name The device name product The device product name product-id The device product ID string vendor The device vendor name vendor-id The device vendor ID string class The device type class bus The device bus type id The device identifier DEPLOYMENT Valid property names for the "deployment" type are: id The deployment identifier EXIT STATUS
The exit status will be 0 if matching entries were found, or 1 if not matches were found SEE ALSO
"osinfo-db-validate(1)", "osinfo-detect(1)" AUTHORS
Daniel P. Berrange <berrange@redhat.com> COPYRIGHT
Copyright (C) 2012 Red Hat, Inc. LICENSE
"osinfo-query" is distributed under the termsof the GNU LGPL v2+ license. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE libosinfo-0.2.7 2013-02-06 OSINFO-QUERY.C(1)
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