glances/README

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Glances -- Eye on your system
=============================

## Description

Glances is a CLI curses based monitoring tool for GNU/Linux and BSD OS.

Glances uses the PsUtil library to get information from your system.

It is developed in Python.

![screenshot](https://github.com/nicolargo/glances/raw/master/screenshot.png)

## Installation

### From package manager (very easy way)

Packages exist for Arch, Fedora, Redhat, FreeBSD...

### From PPA (easy way for Ubuntu/Mint...)

Arnaud Hartmann (thanks to him !) maintains a PPA with the latest Glances version:

To install the PPA just enter:

        $ sudo add-apt-repository ppa:arnaud-hartmann/glances-dev
        $ sudo apt-get update

Then install Glances:

        $ sudo apt-get install glances

### From PyPi (easy way)

PyPi is an official Python package manager.

You first need to install pypi on your system. For exemple on Debian/Ubuntu:

        $ sudo apt-get install python-pip

Then install the latest Glances version:

        $ sudo pip install glances

### From PPA (Ubuntu/Mint)

Thanks to Arnaud Hartmann, a PPA is available for the stable branch.

To install it on your Ubuntu system:

	$ sudo add-apt-repository ppa:arnaud-hartmann/glances-stable
	$ sudo apt-get update
	$ sudo apt-get install glances

The PPA is available for Ubuntu version 9.10 to 12.04.

### From source

Get the latest version:

	$ wget https://github.com/downloads/nicolargo/glances/glances-1.4.tar.gz

Glances use a standard GNU style installer:

	$ tar zxvf glances-1.4.tar.gz
	$ cd glances-1.4
	$ sudo python setup.py install

Pre-requisites:

* Python 2.6+ (not tested with Python 3+)

## Running

Easy way (that's all folks !):

	$ glances.py

## User guide

By default, stats are refreshed every second, to change this setting, you can
use the -t option. For exemple to set the refrech rate to 5 seconds:

	$ glances.py -t 5

Importants stats are colored:

* GREEN:   stat counter is "OK"
* BLUE:    stat counter is "CAREFUL"
* MAGENTA: stat counter is "WARNING"
* RED:     stat counter is "CRITICAL"

When Glances is running, you can press:

* 'h' to display an help message whith the keys you can press
* 'a' to set the automatic mode. The processes are sorted automatically

    If CPU > 70%, sort by process "CPU consumption"

    If MEM > 70%, sort by process "memory size"

* 'c' to sort the processes list by CPU consumption
* 'd' Disable or enable the disk IO stats
* 'f' Disable or enable the file system stats
* 'l' Disable or enable the logs
* 'm' to sort the processes list by process MEM
* 'n' Disable or enable the network interfaces stats
* 'p' to sort by process name
* 'q' Exit

### Header

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/header.png)

The header shows the host name and the operating system name, version and architecture.

### CPU

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/cpu.png)

The CPU states are shown as a percentage and for the configured refresh
time. The total CPU usage is displayed on the first line.

If user|kernel|nice CPU is < 50%, then status is set to "OK".

If user|kernel|nice CPU is > 50%, then status is set to "CAREFUL".

If user|kernel|nice CPU is > 70%, then status is set to "WARNING".

If user|kernel|nice CPU is > 90%, then status is set to "CRITICAL".

### Load

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/load.png)

On the Nosheep blog, Zach defines the average load: "In short it is the
average sum of the number of processes waiting in the run-queue plus the
number currently executing over 1, 5, and 15 minute time periods."

Glances gets the number of CPU cores to adapt the alerts. With Glances,
alerts on average load are only set on 5 and 15 mins. The first line 
also display the number of CPU core.

If average load is < O.7*Core, then status is set to "OK".

If average load is > O.7*Core, then status is set to "CAREFUL".

If average load is > 1*Core, then status is set to "WARNING".

If average load is > 5*Core, then status is set to "CRITICAL".

### Memory

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/mem.png)

Glances uses tree columns: memory (RAM), "real" and swap.

Real used memory is: used - cache.

Real free memory is: free + cache.

With Glances, alerts are only set for on used swap and real memory.

If memory is < 50%, then status is set to "OK".

If memory is > 50%, then status is set to "CAREFUL".

If memory is > 70%, then status is set to "WARNING".

If memory is > 90%, then status is set to "CRITICAL".

### Network bit rate

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/network.png)

Glances display the network interface bit rate. The unit is adapted
dynamicaly (bits per second, Kbits per second, Mbits per second...).

Alerts are set only if the network interface maximum speed is available.

If bitrate is < 50%, then status is set to "OK".

If bitrate is > 50%, then status is set to "CAREFUL".

If bitrate is > 70%, then status is set to "WARNING".

If bitrate is > 90%, then status is set to "CRITICAL".

For exemple, on a 100 Mbps Ethernet interface, the warning status is set
if the bit rate is higher than 70 Mbps.

### Disk I/O

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/diskio.png)

Glances display the disk I/O throughput. The unit is adapted dynamicaly
(bytes per second, Kbytes per second, Mbytes per second...).

There is no alert on this information.

### Filesystem

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/fs.png)

Glances display the total and used filesytem disk space. The unit is
adapted dynamicaly (bytes per second, Kbytes per second, Mbytes per
second...).

Alerts are set for used disk space:

If disk used is < 50%, then status is set to "OK".

If disk used is > 50%, then status is set to "CAREFUL".

If disk used is > 70%, then status is set to "WARNING".

If disk used is > 90%, then status is set to "CRITICAL".

### Processes

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/processlist.png)

Glances displays a summary and a list of processes.

By default (or if you hit the 'a' key) the process list is automaticaly
sorted by CPU of memory consumption.

The number of processes in the list is adapted to the screen size.

* VIRT: Virtual memory size (in byte)
* REST: Amount of resident memory (in byte)
* CPU%: % of CPU used by the process
* MEM%: % of MEM used by the process
* PID: Process ID
* USER: Process user ID
* NI: Nice level of the process
* S: Process status

   R - Running
   D - Sleeping (may not be interrupted)
   S - Sleeping (may be interrupted)
   T - Traced or stopped
   Z - Zombie or "hung" process

* TIME+:  Cumulative CPU time used
* NAME: Process name or command line


### Logs

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/logs.png)

A logs list is displayed in the bottom of the screen if (an only if):

* at least one WARNING or CRITICAL alert was occured.
* space is available in the bottom of the console/terminal

There is one line per alert with the following information:

* start date
* end date
* alert name
* (min/avg/max) values

### Footer

![screenshot](https://github.com/nicolargo/glances/raw/master/doc/footer.png)

Glances displays the current time/date and access to the embeded help screen.

## Localisation

To generate french locale execute as root or sudo :
i18n_francais_generate.sh

To generate spanish locale execute as root or sudo :
i18n_espanol_generate.sh

## Todo

You are welcome to contribute to this software.

* Code optimization
* Port to FreeBSD and Mac OS X
* Documentation for HTML and CVS export option