loadsim-users

Re: [Loadsim-users] Re: LoadSim not finishing simulation

[<ke...@ke...>]

On 04/16/2001 01:41:26 PM, Vincent Sheffer wrote:
> Which JDK are you using?  I use JDK 1.3.  In the past, I've had
> problems with the HTTPConnection class in earlier JDKs.

Currently using IBM JDK 1.2.2 (needed for Websphere).
I'll try the 1.3 JDK though it will unfortunately break
Websphere :-P


> LoadSim also ships with something called HTTPClient,
> which is another, 3rd party implementation of the HTTP comms
> layer.  This worked better than the JDK 1.1.x implementations

How do you get loadsim to use this instead?  Should be
a quick way of finding out whether the JDK is the culprit.


 ken

Re: [Loadsim-users] Re: LoadSim not finishing simulation

[<ke...@ke...>]

On 04/16/2001 03:37:21 PM, Vincent Sheffer wrote:
> Try this:
> java -classpath $LOADSIM_HOME/lib/loadsim.jar
> -Djava.protocol.handler.pkgs=HTTPClient org.openware.loadsim.LoadSim

Behavior is exactly the same :-(
It starts the simulation and never finishes.
"Exit" hangs.
I'll try upgrading my JDK to 1.3.  Can't think
of anything else...


 ken

Re: [Loadsim-users] Re: LoadSim not finishing simulation

[Vincent S. <vsh...@op...>]

I've just tried it again with the simulation.xml file that I sent you.  

After typing 'start' I get "Started simulation on '//localhost:8000".  Do you
get that message?

To get the Tcl prompt back you do need to hit the return key.

I've also exited the simulation before it was over and it works fine.  LoadSim
has replaced the Tcl exit command with one of it's own to stop all of the other
simulations running.  This takes a few seconds, but you should see something to
the effect of:

Stopping simulation //localhost:8000
Simulation complete: remote host is '//localhost:8000': elapsed time is 00:01:30 ms

I've also tried the IBM JDK 1.3 (I run Linux), and I get the same behavior. 
Unfortunately, I don't have a JDK 1.2.2, so I am unable to try it (and it is
too late right now to download it).

I am troubled as to why you are having so much difficulty.  Are you using the
simulation.xml that I sent you a couple of days ago?  It should absolutely not
hang.  When I ran the simulation it did take somewhere around 10-20 minutes (I
didn't notice the elapsed time unfortunately) to complete, and there is no
feedback during the simulation, so it *will* look like it is just sitting there
doing nothing.

-vince

On Mon, 16 Apr 2001, ke...@ke... wrote:
> On 04/16/2001 03:37:21 PM, Vincent Sheffer wrote:
> > Try this:
> > java -classpath $LOADSIM_HOME/lib/loadsim.jar
> > -Djava.protocol.handler.pkgs=HTTPClient org.openware.loadsim.LoadSim
> 
> Behavior is exactly the same :-(
> It starts the simulation and never finishes.
> "Exit" hangs.
> I'll try upgrading my JDK to 1.3.  Can't think
> of anything else...
> 
> 
>  ken
> 
> 
> _______________________________________________
> Loadsim-users mailing list
> Loa...@li...
> http://lists.sourceforge.net/lists/listinfo/loadsim-users

Re: [Loadsim-users] Re: LoadSim not finishing simulation

[<ke...@ke...>]

On 04/17/2001 01:46:15 AM, Vincent Sheffer wrote:
> After typing 'start' I get "Started simulation on
> '//localhost:8000".  Do you get that message?
> To get the Tcl prompt back you do need to hit the return key.

Yes, I do get this.  The copy/paste I sent you shows the
TCL prompt.


> using the simulation.xml that I sent you a couple of days ago?

I modified it to do just 5 iterations w/ 1 user to
make sure I see the Stop msg more quickly.

I just tried it on a different machine w/ Sun
JDK 1.3_02 (the latest Win32 one).  It does stop
properly on that one.  I'll try a different JDK on
my system.  It's a bummer that it doesn't work
on 1.2.2 because that is my main Java development
environment (VisualAge for Java w/ Websphere)...


 ken

Re: [Loadsim-users] Re: LoadSim not finishing simulation

[<ke...@ke...>]

On 04/18/2001 03:27:31 PM, vinny wrote:
> It looks like JDK 1.3 is the first version of the JDK that has a good
> implementation of the HTTP client code.

But shouldn't the built-in http code from running it this
way have worked?
java -classpath $LOADSIM_HOME/lib/loadsim.jar
-Djava.protocol.handler.pkgs=HTTPClient org.openware.loadsim.LoadSim

I'll confirm when I get JDK1.3 on my
current system.  Tied up w/ performance
tweaking now.


 ken

Re: [Loadsim-users] Re: LoadSim not finishing simulation

[<vi...@ne...>]

Alright, here is the history...

When I first starting working on this about 1 1/2 ago, I was jusing JDK 1.1.8.
 The implementation of the HTTP client code flat out didn't work (I forget exactly
what the problem was, but it simply didn't work).  So, I hunted around and found
HTTPClient, which using the property that you give, did work.  At the job that
I was doing when I first used LoadSim I only simulated up to around 80 users
(only about 20 per machine).  HTTPClient worked fine.  

More recently, however, I used LoadSim simulating much large numbers of users
(upwards of 200 per machine).  HTTPClient started breaking down and not working
very well.  So, I decided to see if the JDK 1.3 (which is the JDK I use now
exclusively -- we use Weblogic instead of Websphere) had improved their HTTP
client implementation.  To my surprise and happiness it was markedly better.
 So, now, by default, LoadSim uses the built-in HTTP client implementation (which,
for that reason, I would recommend using JDK 1.3 for running simulations). 
LoasSim still ships with HTTPClient, which you should be able to use.

Now, for those interested, the version of HTTPClient that I use is from over
a year ago.  Maybe newer versions work better.  If you'd like to try a new version
check out the link to the HTTPClient site in the acknowledgements section of
the LoadSim homepage (I think LoadSim ships with 0.3.1 and the newer version
is 0.3.2).

Well, that is probably about as cleas as mud, wouldn't you say?
>
>
>On 04/18/2001 03:27:31 PM, vinny wrote:
>> It looks like JDK 1.3 is the first version of the JDK that has a good
>> implementation of the HTTP client code.
>
>But shouldn't the built-in http code from running it this
>way have worked?
>java -classpath $LOADSIM_HOME/lib/loadsim.jar
>-Djava.protocol.handler.pkgs=HTTPClient org.openware.loadsim.LoadSim
>
>I'll confirm when I get JDK1.3 on my
>current system.  Tied up w/ performance
>tweaking now.
>
>
> ken
>
>
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