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Project Description

Atop is an ASCII full-screen performance monitor
that is capable of reporting the activity of all
processes (even if processes have finished during
the interval), daily logging of system and process
activity for long-term analysis, highlighting
overloaded system resources by using colors, etc.
At regular intervals, it shows system-level
activity related to the CPU, memory, swap, disks,
and network layers, and for every active process
it shows the CPU utilization, the memory growth,
priority, username, state, and exit code.

System Requirements

System requirement is not defined
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2011-03-15 08:45

An additional value is shown for the current frequency and the current scaling percentage of the CPU. Additional system-level counters are shown for the total number of threads that are running, sleeping interruptible, and sleeping uninterruptible. When the number of lines in a window is too small for the amount of system-level lines, the number of variable resources (like disks, interfaces, etc.) is limited automatically to be able to continue. The signal SIGUSR2 can be sent to atop to take one more sample and terminate (e.g. used to speed up suspend/hibernate). Support for the disk type 'mmcblk'.
Tags: Minor feature enhancements

2010-05-03 21:02

Disk I/O statistics are maintained on level of logical volume (LVM) and MD device. Log files are properly switched in case of suspend/hibernate. Layout of lines with system-level statistics can be redefined. Previous atop-versions are automatically activated for older log files.
Tags: Major feature enhancements

2010-01-26 17:16

The screen interface has been redesigned completely with support for a variable number of columns depending on the window size. It is now possible to define your own output line with process-level statistics. A system-wide configuration file was introduced for atop and atopsar. Handling of log files was improved and additional counters are maintained.

2008-03-06 14:20

The atop command shows the number of running and
sleeping (interruptible/non-interruptible) threads
per process and shows the PPID per process. The
command atopsar is now able to make summary
reports and shows information about the top 3 most
active processes per sample. In both commands,
several bugs have been fixed.
Tags: Major feature enhancements

2007-11-20 12:16

This release added colors and (on request) markers in the reports generated by the command atopsar to highlight critical resource consumption. Several major bugs were fixed in atop/atopsar, mainly for larger and busier systems.
Tags: Major bugfixes

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