Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!usc!ucsd!swrinde!cs.utexas.edu!execu!sequoia!rpp386!garnett
From: garnett@rpp386.cactus.org (John Garnett)
Newsgroups: comp.unix.aix
Subject: Re: CPU limit
Message-ID: <17148@rpp386.cactus.org>
Date: 15 Oct 89 22:46:34 GMT
References: <834@mit-amt.MEDIA.MIT.EDU>
Reply-To: garnett@rpp386.UUCP (John Garnett)
Organization: USENET Users' Anonymous
Lines: 22

In article <834@mit-amt.MEDIA.MIT.EDU> cchen@mit-amt.MEDIA.MIT.EDU (Curtis Chen) writes:
>
>I am running a large program on my RT which is not allowed to run to
>completion.  After running this program for about an hour, this process        
>is put to sleep.  I understand there is a limit on the amount of CPU
>that a process is allowed to consume before it is sleep-ed.  Is there
>any way to increase or eliminate this limit?  Also, is there any way
>to re-wake sleeping processes?
>

One hack way to give an old process a larger slice of the CPU time is to
have the program periodically fork a new copy of itself.  The two copies
should check the return value of the fork() call and exit if non-zero.
The child process can then continue processing as if the fork never took
place.  The difference is that the process scheduler will see the child
as a new process and will give it more CPU time.

-- 
+------------------------------------+-----------------------------------+
| John Garnett                       |      Base 1.9                     |
| garnett@rpp386.cactus.org          |                                   |
| {bigtex|texbell}!rpp386!garnett    |      "It's almost binary"         |