output of top on a linux box

Pradnyesh Sawant spradml at gmail.com
Mon Apr 9 19:56:03 CEST 2007


Thanks for the pointer to use /proc/stat
However, that does not answer my other question about string slicing
Any pointers in that direction would be helpful...

Thanks a lot!

On 4/9/07, Jeff McNeil <jeff at jmcneil.net> wrote:
> Can you pull the same information from /proc/stat as opposed to using
> a pipe to top? The first line(s) should contain (at least):
>
> cpu usermode, lowprio, system, idle, hz.
>
> The 2.6 kernel adds iowait, irq, and soft irq.  It seems that this
> might be a better solution than executing that additional command.
>
> Take a look at proc(5).
>
> Thanks,
>
> Jeff
>
>
>
>
>
> On 4/9/07, Pradnyesh Sawant <spradml at gmail.com> wrote:
> > Hello,
> > I need the cpu usage of a linux box, for which i capture the output of
> > "top" using "popen". However, i am facing problems during string
> > handling. The code snippet is:-
> >
> > top = os.popen("top -n 1")
> > rd = top.read().split("\n")
> > splt = rd[2].split()
> > # cpu = splt[2][:-4]  # why ain't this working ???
> > cpu = splt[2]
> > print "cpu usage: %s, %s" % (cpu, type(cpu))
> >
> > the "print" statement prints, "cpu usage: 0.5%sy, <type 'str'>". i
> > tried my best to get rid of the "%sy" after the "0.5", but couldn't
> > succeed (even though the type of "cpu" is "string").
> >
> > Also, one weird thing that was happening was that if i still "split"
> > the cpu string (removed the last 4 characters), the output of the next
> > print statement was wrong (specifically, the first 2 characters got
> > chipped off). This output is totally unexpected, and wrong...
> >
> > Can anyone kindly help me in understanding what exactly is going on here.
> >
> > Thanks a lot!
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>



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