01-19-2011
Memory usage shown is high
Hello all,
I am facing a memory related issue on my linux that is CentOS 4.0. What I see as an output of top command, free command is that memory usage is almost 90% which is quite high without much load on the system. This is continuously showing 90% or so of memory usage with top or free command.
However, when look at the later part of the output of the top command that is for processes (and sort it by %MEM usage by typing interactive M) and I sum up for individual processes, it is hardly exceeding 15%. The sum of %MEM is about 13% for the top 5 or 6 processes and beyond the 6th process, %MEM displayed is 0 (0%).
How do we explain this anomaly ? If the memory usage reported by top and free is fine, how do I find where the memory is being used? Also, what is the perfect way to find how much actual physical memory is being used by the system ?
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LEARN ABOUT DEBIAN
dtc_install_centos
dtc_install_centos(8) System Manager's Manual dtc_install_centos(8)
NAME
dtc_install_centos - bootstrap a CentOS install to use in a chroot or VM
SYNOPSIS
dtc_install_centos <install root> <yum environment>
DESCRIPTION
This shell script is part of the dtc-xen package, generally to be used by the dtc panel to install a new a Xen VPS server. This script is
called by dtc_reinstall_os when the user chooses to install the CentOS operating system.
How it works: it generates a temporary yum configuration in the yum environment directory, that directs yum to act inside the install root
instead of in the base system; then it kindly requests yum to install the basesystem, centos-release and yum packages onto it. Yum then
uses the configuration to download the required (usually, security-updated) packages and then perform the RPM installation process under
the install root.
It requires both RPM and yum. It does work under Debian (it was developed in Ubuntu first). It should also work on RPM-based systems
without destroying the system-wide RPM and yum configurations.
OPTION
<install root>
Target directory where CentOS will be deployed. Must exist beforehand.
<yum environment>
Directory where yum will store the repository manifests and configuration. Will be automatically created. Cached RPMs and manifests will
be left, as usual, in a directory var/cache/yum inside the install root.
EXAMPLE
dtc_install_centos /root/yum /xen/13
This will setup the operating system in /xen/13, with the CentOS configuration folder in /root/yum.
BUGS
It's limited to CentOS 5 at the moment.
It must be run as root.
Under some circumstances, the installation process itself may kill processes running on the host machine. The chroot yum does should be
sufficient to avoid this, but we haven't been able, yet, to ascertain why this fails sometimes.
SEE ALSO
dtc_reinstall_os(8)
VERSION
This documentation describes dtc_install_os version 0.3.1.
See http://www.gplhost.com/software-dtc-xen.html for updates.
dtc_install_centos(8)