CPU Usage at another Compute Node?


 
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Old 07-20-2007
CPU Usage at another Compute Node?

Hi,

I am trying to get the cpu usage of a job/process. The machine that has these jobs is a cluster with 1 master node and 10 compute nodes.

Now, the complexity is that not all jobs are on the master node. So, in order to get the cpu usage of a job at another node, I have to ssh into it and then use the ps command with the process id. The problem is that it takes atleast 3.5 seconds to ssh into one of the compute nodes. Using the ps command after that will cause the cpu usage to have the wrong data, or will have the process expired itself. Is there anything that I can use to get the cpu usage of a process id at another node without having to ssh into it.

Thank you all very much for your time and efforts.

P.S. - Dont know if this matters, but just thought I would give some additional info for Python users. I am using these commands in a Python script, by importing the os class, and using os.popen() for the "ps" command, and os.execv() for the ssh command.
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QSTAT(1)						User Contributed Perl Documentation						  QSTAT(1)

NAME
qstat - display job/partition information in a familiar pbs format SYNOPSIS
qstat [-f] [-a|-i|-r] [-n [-1]] [-G|-M] [-u user_list] [-? | --help] [--man] [job_id...] qstat -Q [-f] qstat -q DESCRIPTION
The qstat command displays information about jobs. OPTIONS
-a Displays all jobs in a single-line format. See the STANDARD OUTPUT section for format details. -i Displays information about idle jobs. This includes jobs which are queued or held. -f Displays the full information for each selected job in a multi-line format. See the STANDARD OUTPUT section for format details. -G Display size information in gigabytes. -M Show size information, disk or memory in mega-words. A word is considered to be 8 bytes. -n Displays nodes allocated to a job in addition to the basic information. -1 In combination with -n, the -1 option puts all of the nodes on the same line as the job id. -r Displays information about running jobs. This includes jobs which are running or suspended. -u user_list Display job information for all jobs owned by the specified user(s). The format of user_list is: user_name[,user_name...]. -? | --help brief help message --man full documentation STANDARD OUTPUT
Displaying Job Status If the -a, -i, -f, -r, -u, -n, -G, and -M options are not specified, the brief single-line display format is used. The following items are displayed on a single line, in the specified order, separated by white space: the job id the job name the job owner the cpu time used the job state C - Job is completed after having run E - Job is exiting after having run. H - Job is held. Q - job is queued, eligible to run or routed. R - job is running. T - job is being moved to new location. W - job is waiting for its execution time (-a option) to be reached. S - job is suspended. the queue that the job is in If the -f option is specified, the multi-line display format is used. The output for each job consists of the header line: Job Id: job identifier followed by one line per job attribute of the form: attribute_name = value If any of the options -a, -i, -r, -u, -n, -G or -M are specified, the normal single-line display format is used. The following items are displayed on a single line, in the specified order, separated by white space: the job id the job owner the queue the job is in the job name the session id (if the job is running) the number of nodes requested by the job the number of cpus or tasks requested by the job the amount of memory requested by the job either the cpu time, if specified, or wall time requested by the job, (in hh:mm) the job state The amount of cpu time or wall time used by the job (in hh:mm) EXIT STATUS
On success, qstat will exit with a value of zero. On failure, qstat will exit with a value greater than zero. perl v5.14.2 2012-04-10 QSTAT(1)