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Simultaneous write on textfile over NFS [message #69722]

Wed, 10 February 2010 01:29

Johannes Korn
Messages: 5
Registered: January 2010

Junior Member

Hi,

I often run idl programs which utilize only one CPU core (for loops).
The output is a text line appended to a file.

To exploit a multicore I run multiple instances with different parameter
setups. The output goes to different files. After all jobs are completed
I manually merge the files.
This ways I have to keep track which file contains what output and so on.

My question, what happens if I use the same output file for all jobs. Is
it save?

This means every job would write about every 15 seconds a line like that.

OPENW, u, 'file.txt', /GET_LUN, WIDTH=250, /APPEND
printf, a, b, c
FREE_LUN,u

What if two write accesses collide? Will the file be corrupted? Will
there be an error? Will the second job wait until the first one has
closed the file?

Filesystem is NFS.

Regards,

Johannes

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[Message index]

		Simultaneous write on textfile over NFS By: Johannes Korn on Wed, 10 February 2010 01:29
		Re: Simultaneous write on textfile over NFS By: R.Bauer on Wed, 10 February 2010 07:04

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