| Re: IDL & Memory Usage... [message #32018 is a reply to message #31920] |
Tue, 03 September 2002 07:48  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Randall Skelton <rhskelto@atm.ox.ac.uk> writes:
> Hi all,
>
> Does anyone know how IDL 5.5a breaks up into smaller processes under
> Linux? When I run top on my machine I see:
>
> ------------------------------------------------------------ -------------------
> 2:37pm up 12 days, 4:41, 10 users, load average: 0.16, 0.12, 0.09
> 85 processes: 84 sleeping, 1 running, 0 zombie, 0 stopped
> CPU0 states: 0.0% user, 2.2% system, 0.0% nice, 97.2% idle
> CPU1 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle
> Mem: 3089264K av, 2238680K used, 850584K free, 196K shrd, 200332K buff
> Swap: 6289320K av, 49024K used, 6240296K free 939340K cached
>
> PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
> 579 rhs 8 0 828M 828M 3912 S 0.0 27.4 74:11 idl
> 583 rhs 9 0 828M 828M 3912 S 0.0 27.4 0:00 idl
> 584 rhs 9 0 828M 828M 3912 S 0.0 27.4 15:46 idl
> 585 rhs 9 0 828M 828M 3912 S 0.0 27.4 0:00 idl
> ------------------------------------------------------------ -------------------
Hi Randall--
Let me guess. Are you running three or four widget programs? If the
answer is yes, I will submit that idl "fork()s" itself for each widget
that appears or perhaps creates a new thread, which is the same as a
new process under Linux. This is a common approach for X-windows
applications.
The second point is that all of these processes share the same memory,
so they aren't using 4 x the memory of a single one.
Hope that helps, [ and is right! ]
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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