Re: Jobs or Threads?

["Brad Stone" <brad@xxxxxxxxxxxx>]

thanks David,

I'm speaking mainly of my apps.  As you know I wrote a
utility on the As/400 that lets you grab a URI.  I also made
a Java version of the app recently.

I use this as the base for a simple load testing scenario.
I submit the command multiple times to the same URL to see
how a server will handle it, storing the elapsed time from
connection until the data is retrieved.

So, for the same app in Java I made a wrapper that extends
Thread.  I then loop x times creating a new thread for each
"hit" that I want.  Then store the times from that.

Testing with only about 10 hits I haven't seen much of a
difference.  Even running threads on the AS/400 vs. my PC
don't seem to make much difference.

The startup of the job itself in this case should not affect
the elapsed time that I am storing.  I was just wondering
which would be better.  To me, it seems they are fairly
equal.  Multiple jobs, as you specified, would demand more
resources on the system during startup, though.

Brad

On Mon, 25 Feb 2002 11:54:05 -0700
 "David Morris" <David.Morris@plumcreek.com> wrote:
> Brad,
>
> The biggest difference between the two would be the extra
> overhead of a job vs a thread. You can reduce that
> overhead
> some with prestart jobs. The biggest concern with
> multi-thread
> jobs is that a lot of legacy (including system) code does
> not
> behave well in a multi-threaded environment.
>
> David Morris
>
> >>> brad@bvstools.com 02/25/02 10:42AM >>>
> Just thinking outload here.
>
> Let's assume I have an appliation that I want to run many
> times simultaniously.  Assuming I'm running the aplicate
> on
> the 400, what would be "better".
>
> 1 - Running the application in multiple jobs (ie
> submitting
> the job x times into QSYSNOMAX or something similar)
>
> 2 - Running many instances of the apllication using Java
> threads?
>
> I'm guessing it really won't make much of a difference
> unless job resource allocation comes into play.
>
> Bradley V. Stone
> BVS.Tools
> www.bvstools.com
>
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Bradley V. Stone
BVS.Tools
www.bvstools.com