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Re: Multiple journal files on linux [message #31206 is a reply to message #31108]

Wed, 19 June 2002 08:57

Ken Mankoff
Messages: 158
Registered: February 2000

Senior Member

On 19 Jun 2002, Mark McGrath wrote:
> This routine makes an `almost' unique file. An example:
> Running IDL on a linux cluster, as we do here, if the machine clocks
> are a litle out of sync it would be possible to over write the file
> that had been opened already, no? (Not much info lost there though,
> but the more serious case of the clocks being a lot out of sync then
> large amounts of info in the journal file could be lost.)
>
> Any ideas, anyone?

I ran into the problem of making a unique directory on a
multiprocessor machine, where a timestamp may not suffice...

Use the unique process ID. Each IDL session will have a unique PID, no
matter how many processors and what the time is on each machine... I
use a combination, the time (in msec), then a "_", then the PID.

I believe you can still have multiple processes assigned the same time
and PID if you are using networked computers (as opposed to 1 computer
with multiple processors), but the chances, especially when using msec
and not sec, drop to VERY low.

-k.

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[Message index]

		Multiple journal files on linux By: markmcg4 on Fri, 14 June 2002 02:13
		Re: Multiple journal files on linux By: Paul Van Delst[1] on Wed, 19 June 2002 09:21
		Re: Multiple journal files on linux By: Ken Mankoff on Wed, 19 June 2002 08:57
		Re: Multiple journal files on linux By: Craig Markwardt on Wed, 19 June 2002 06:34
		Re: Multiple journal files on linux By: R.Bauer on Mon, 24 June 2002 06:59

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