[ILUG] Retrieve memory used of java process on HP-UX

[Mark Clifford]

Hi Brian thanks for your response.

Is there a way to compute the vsz to the top command how can i work this out
to convert the number 182332 to the correct memory usage which is 571MB or
alternativly how can i parse through the top command to retrieve the 571MB
only back from command line.

Thanks in advance.


On 29/05/06, Brian Foster <blf at blf.utvinternet.ie> wrote:
>
> | Date: Mon, 29 May 2006 17:50:04 +0200
> | From: "Mark Clifford" <markcliff at gmail.com>
> |
> | I wanna [ print ] the memory used from a java process
> | using a shell script.
> |
> | Now i thought i could use the following:
> |   ps -uusername -o vsz, comm | grep java
> |
> | Which returns:
> |   182332 java
> |
> | it seems to just return a size that is not the same as
> | the one if i do a top command.  Why is this[? ... ]
>
> different commands compute "the amount of memory used"
> differently.  the hard part of the computation is what
> to do about memory that is, or could be, shared (used)
> by multiple processes, such as text (code) and shared
> memory (nominally data, i.e. shmat(2) et al.).
>
> one method is to simply add it all up.  the problem
> here is the value is "too large" when there there are
> many sharers.
>
> another is to divide the total for shared regions by
> the number of sharers.  the problem here is the value
> will fluxuate up-and-down as processes start/exit.
>
> a weighted average is therefore sometimes used.  the
> value will still fluxuate, but "slower", and it is
> rather more obscure how the value relates to anything.
> also, there are different weighing algorithms and time
> intervals, increasing the number of different values
> printed.
>
> and so on ....
>
> I would suggest either picking a number you believe in,
> which probably means one adequate for yer purpose, or
> defining yer own algorithm, or reworking the issue so
> that you don't need this hard-to-define number.  (or
> use static binaries, where there is less of an issue.)
>
> cheers!
>        -blf-
> --
> Experienced (20+ yrs) kernel/software Eng: | Brian Foster   Montpellier,
> • Unix, embedded, &tc;  • Linux;  • doc;  | blf at utvinternet.ie   FRANCE
> • IDL, automated testing, process, &tc.   |  Stop E$$o (ExxonMobile)!
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