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Mike Cunningham skrev:
Is there something I am missing? Are all of you running under the one partition model or have you split the three functions up?
I believe that the primary reason for the "use a separate box for each function" line of thought which is common for PC-based solutions has a very pragmatic background.

Windows and Linux did not[1] provide pools for CPU-cycles and memory - or rather, only one.

Hence it was possible for a single process to grab all available CPU and memory and bring the box to its knees. In the bad old days it was quite common to have a run-away process slow the machine so much down that it took several minutes to get Ctrl-Alt-Del show the task manager. Fortunately this is much better today with multicore machines :)

My suggestion is to create three subsystems - one for each component - and give them a reasonable configuration, and then tell him to do ANYTHING he can to bring the box to its knees. Hopefully you'll just see the resources used, climb to the max, but not impact the rest of the machine.

I did some heavy Java benchmarking on our sole AS/400 and nobody came to complain, as I only used 90% cpu over a couple of hours. I don't think anybody actually noticed. On a Linuxbox people would have come looking for me within a few minutes.


[1] They may now, but most likely in server configurations.


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