The pmap command can be used to obtain a memory map report for a process or list of processes. In my opinion, it is a great tool to explore memory leaks and any other memory related issues. If you simply invoke pmap with no options, it will list the usage with general available options, as shown [...]
Mar 052010
Man: man command formats and displays the on-line manual pages. If you specify section, man only looks in that section of the manual. name is normally the name of the manual page, which is typically the name of a command, function, or file. Whatis: whatis command searches a set of database files containing short descriptions [...]
iostat (input/output statistics) an utility that shows Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions. The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.
May 202009
ps (process status) is an utility that reports a snapshot of the current processes. By default, ps selects all processes with the same effective user ID (euid=EUID) as the current user and associated with the same terminal as the invoker. It displays the process ID (pid=PID), the terminal associated with the process (tname=TTY), the cumulated CPU time in [dd-]hh:mm:ss format (time=TIME), and the executable name (ucmd=CMD). Below is sample default output, which is unsorted.
mpstat (multiple processor statistics) is an utility that report processors related statistics. Below is the sample default output generated by mpstat with no options:
May 132009
OS Watcher (OSW) is a collection of UNIX shell scripts intended to collect and archive operating system and network metrics to aid support in diagnosing performance issues. OSW operates as a set of background processes on the server and gathers OS data on a regular basis, invoking such Unix utilities as vmstat, netstat and iostat.
May 132009
Preparing a Linux server to install oracle has been made easy with the help of oracle-validated rpm package. Install of oracle-validated automates the download and install of all required RPMs including dependencies, setup of Linux kernel parameters, creation of oracle user (Linux user) and dba, oinstall groups I have been thinking of trying out oracle-validated [...]
vmstat (virtual memory statistics) reports information about processes, memory, paging, block IO, traps, and cpu activity.
May 082009
In the calendar year 2006 and 2007, a number of countries have altered the dates on which they observe Daylight Savings Time (DST). The earliest of these changes will occur on March 26, 2006 for those observing Australian DST and in certain parts of the state of Indiana (USA). (Reference: http://aa.usno.navy.mil/faq/docs/daylight_time.html )
Yum (Yellow dog Updater, Modified) automatic updater and package installer/remover for rpm systems. It automatically computes dependencies and figures out what things should occur to install packages.
Packages also include a digital signature to identify their source. Software management utilities like yum and rpm verify these signatures using GPG public key. Yum and RPM share a common keyring that stores all public keys for approved sources.