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Operating Systems Linux Inconsistency with parallel run Post 303006259 by RudiC on Monday 30th of October 2017 11:40:09 AM
Old 10-30-2017
More details, please.
That file almost certainly will be buffered locally when being accessed from NAS, so the first process should take longest. Will the file be updated / written back? Per process? Are the processes doing identical operations on the file? Do these influence each other? How do user and system times compare between processes? Do you have lock information available?
 

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KILL(2) 							System Calls Manual							   KILL(2)

NAME
kill - send signal to a process SYNOPSIS
kill(pid, sig); DESCRIPTION
Kill sends the signal sig to the process specified by the process number in r0. See signal(2) for a list of signals. The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user. If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4). If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler and initialization processes, see init(8). Processes may send signals to themselves. SEE ALSO
signal(2), kill(1) DIAGNOSTICS
Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user ID and the user is not super-user, or if the process does not exist. ASSEMBLER
(kill = 37.) (process number in r0) sys kill; sig KILL(2)
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