Interactive jobs on cluster - Revision history

Nn320 at 11:09, 18 May 2020

2020-05-18T11:09:53Z

← Older revision		Revision as of 11:09, 18 May 2020
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	===top===		===top===
	<b>top </b> command is used to list the processes running on the system in real time. To exit from the top window press <b>q</b> . top command has several useful options.		<b>top </b> command is used to list the processes running on the system in real time. To exit from the top window press <b>q</b> . top command has several useful options.
	* <b>top -u CRSid </b> is used to list the jobs of a particular user		* <b>top -u CRSid </b> is used to list the jobs of a particular user.
	* <b> top -n 1 -b > output </b> can be used to save the top window to a file		* <b> top -n 1 -b > output </b> can be used to save the top window to a file.
	In top window itself		In top window itself
	* pressing <b>z </b> highlights the running process		* pressing <b>z </b> highlights the running process.
	* pressing <b>c </b> shows absolute path of all running processes		* pressing <b>c </b> shows absolute path of all running processes.
	* pressing <b>k </b> displays a line in top window where the process id (pid) of the process that needs to be killed can be directly entered and when asked about confirmation simply press <b>y </b> to kill the process.		* pressing <b>k </b> displays a line in top window where the process id (pid) of the process that needs to be killed can be directly entered and when asked about confirmation simply press <b>y </b> to kill the process.
	* pressing <b>Shift+o </b> opens a new window with several options along with the corresponding letter that needs to be pressed to sort the top window based on a particular column. For example to sort all processes depending on memory usage i.e. %MEM press <b> shift+o, n </b> and <b> Enter </b>.		* pressing <b>Shift+o </b> opens a new window with several options along with the corresponding letter that needs to be pressed to sort the top window based on a particular column. For example to sort all processes depending on memory usage i.e. %MEM press <b> shift+o, n </b> and <b> Enter </b>.

Nn320 at 11:08, 18 May 2020

2020-05-18T11:08:13Z

← Older revision		Revision as of 11:08, 18 May 2020
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	When using cluster it is important to know how to manage interactive jobs. We may want to know what all jobs are running, what all jobs a particular user is running and how to kill a particular job. The following bash commands are useful for ~~the~~ purpose: top, ps and kill.		When using cluster it is important to know how to manage interactive jobs. We may want to know what all jobs are running, what all jobs a particular user is running and how to kill a particular job. The following bash commands are useful for this purpose: top, ps and kill.

	===top===		===top===
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	ps stands for process status. One of its use can be to view the jobs of a particular user.		ps stands for process status. One of its use can be to view the jobs of a particular user.
	<pre> ps aux \| egrep CRSid </pre>		<pre> ps aux \| egrep CRSid </pre>
	~~The~~ ~~a, u and x in~~ aux ~~stand~~ ~~for displaying~~ all processes along with usernames ~~from~~ ~~which~~ ~~processes~~ of ~~a particular user~~ can be ~~extracted~~ ~~using~~ ~~egrep~~.		<b> ps aux </b> displays all processes along with usernames and <b> egrep CRSid </b> can be used to extract processes belonging to a particular user.

	===kill===		===kill===
	kill can be used to kill a process. When running an interactive job, its execution can be stopped by pressing <b>Ctrl+z</b> and then kill command can be used.		kill can be used to kill a process. When running an interactive job, its execution can be stopped by pressing <b>Ctrl+z</b> and then kill command can be used.

Nn320 at 11:05, 18 May 2020

2020-05-18T11:05:30Z

← Older revision		Revision as of 11:05, 18 May 2020
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	===top===		===top===
	top command is used to list the processes running on the system in real time. To exit from the top window press q . top command has several useful options		<b>top </b> command is used to list the processes running on the system in real time. To exit from the top window press <b>q</b> . top command has several useful options.
	* top -u CRSid is used to list the jobs of a particular user		* <b>top -u CRSid </b> is used to list the jobs of a particular user
	* top -n 1 -b > output can be used to save the top window to a file		* <b> top -n 1 -b > output </b> can be used to save the top window to a file
	In top window itself		In top window itself
	* pressing z highlights the running process		* pressing <b>z </b> highlights the running process
	* pressing c shows absolute path of all running processes		* pressing <b>c </b> shows absolute path of all running processes
	* pressing k displays a line in top window where the process id (pid) of the process that needs to be killed can be directly entered and when asked about confirmation simply press y		* pressing <b>k </b> displays a line in top window where the process id (pid) of the process that needs to be killed can be directly entered and when asked about confirmation simply press <b>y </b> to kill the process.
	* pressing Shift+o opens a new window with several options along with the corresponding letter that needs to be pressed to sort the top window based on a particular column.		* pressing <b>Shift+o </b> opens a new window with several options along with the corresponding letter that needs to be pressed to sort the top window based on a particular column. For example to sort all processes depending on memory usage i.e. %MEM press <b> shift+o, n </b> and <b> Enter </b>.
	There is a lot more that can be done using top and more information can be found on its man page.		There is a lot more that can be done using top and more information can be found on its man page.

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	ps stands for process status. One of its use can be to view the jobs of a particular user.		ps stands for process status. One of its use can be to view the jobs of a particular user.
	<pre> ps aux \| egrep CRSid </pre>		<pre> ps aux \| egrep CRSid </pre>
	The a, u and x in aux stand for displaying all processes along with usernames ~~and~~ x ~~stands~~ ~~for~~ ~~displaying~~ ~~even~~ ~~those~~ ~~processes~~ ~~not~~ ~~necessarily~~		The a, u and x in aux stand for displaying all processes along with usernames from which processes of a particular user can be extracted using egrep.

	===kill===		===kill===
	kill can be used to kill a process. When running an interactive job, its execution can be stopped by pressing Ctrl+z and then kill command can be used.		kill can be used to kill a process. When running an interactive job, its execution can be stopped by pressing <b>Ctrl+z</b> and then kill command can be used.
	<pre>		<pre>
	kill signal pid		kill signal pid
	</pre>		</pre>
	kill -9 pid can be used to kill the process immediately. The option -9 stands for SIGKILL. More information about different types of signals can be found here https://en.wikipedia.org/wiki/Signal_(IPC)#List_of_signals		<b> kill -9 pid </b>can be used to kill the process immediately. The option -9 stands for SIGKILL. More information about different types of signals can be found here https://en.wikipedia.org/wiki/Signal_(IPC)#List_of_signals

Nn320: Created page with "When using cluster it is important to know how to manage interactive jobs. We may want to know what all jobs are running, what all jobs a particular user is running and how to..."

2020-05-18T10:55:31Z

Created page with "When using cluster it is important to know how to manage interactive jobs. We may want to know what all jobs are running, what all jobs a particular user is running and how to..."

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When using cluster it is important to know how to manage interactive jobs. We may want to know what all jobs are running, what all jobs a particular user is running and how to kill a particular job. The following bash commands are useful for the purpose: top, ps and kill.

===top===
top command is used to list the processes running on the system in real time. To exit from the top window press q . top command has several useful options
* top -u CRSid is used to list the jobs of a particular user
* top -n 1 -b > output can be used to save the top window to a file
In top window itself
* pressing z highlights the running process
* pressing c shows absolute path of all running processes
* pressing k displays a line in top window where the process id (pid) of the process that needs to be killed can be directly entered and when asked about confirmation simply press y
* pressing Shift+o opens a new window with several options along with the corresponding letter that needs to be pressed to sort the top window based on a particular column.
There is a lot more that can be done using top and more information can be found on its man page.

===ps===
ps stands for process status. One of its use can be to view the jobs of a particular user.
<pre> ps aux | egrep CRSid </pre>
The a, u and x in aux stand for displaying all processes along with usernames and x stands for displaying even those processes not necessarily

===kill===
kill can be used to kill a process. When running an interactive job, its execution can be stopped by pressing Ctrl+z and then kill command can be used.
<pre>
kill signal pid
</pre>
kill -9 pid can be used to kill the process immediately. The option -9 stands for SIGKILL. More information about different types of signals can be found here https://en.wikipedia.org/wiki/Signal_(IPC)#List_of_signals