Alchemi has some issues with how it detects and recovers from errors.
In particular, the following error situation (among possibly others) will
still cause an executor to show up as "red" in the console, even though it
should be "grey":
1) Manager is started successfully
2) Executor connects to Manager on port 9000
3) Manager tries to connect to Executor on port 9001, but fails because
either a) DNS lookup of executor fails b) There is a firewall blocking port
9001 inbound to executor c) Some other network-related reason
I've personally experienced a) and b).
The log files are saying that the manager cannot connect to the two
executors (the ones that aren't running on the manager).
Try this:
1) On the Manager computer, open up a command line (Start>Run cmd)
2) Start the Manager
3) Start the Executor on, let's say executor1
4) On the command line type
telnet executor1 9001
If this opens up with a blank screen, type a few characters and it should
spit back some gibberish like
.NET☺☻☻♥☺♥☺☺hServer encountered an internal error. To get more info turn
on
customErrors in the server's config file.t
Connection to host lost.
This means that the manager can contact executor1 on port 9001
successfully. If not, then we've found the problem -- either the DNS lookup
is failing or port 9001 is not open.
Let me know what this turns up.
-Matt
On 3/30/07, Anh Nghia Nguyen <[EMAIL PROTECTED]> wrote:
hi Matt,
You know
I don't think that the manager can't see the executor
because i can use remote desktop from Manager computer to Executor
computer (to see %CPU)
About the executor name: In Alchemi console, i can see 2
different-(computer)name executors one from manager computer and another
from remote, again 2 executors are red (not gray - disable),
So the name-cause is not reasonable, right?
About the .... post either on mail-list/forum: I've just joined the
mailist recently(over one month) so It's very kind of you to send me the
link or forward that email again
Thanks
Nghia Nguyen
----- Original Message ----
From: Matt Valerio <[EMAIL PROTECTED]>
To: Anh Nghia Nguyen <[EMAIL PROTECTED]>
Cc: Reece Arnott <[EMAIL PROTECTED]>; "
[email protected]" <[email protected]>
Sent: Friday, March 30, 2007 9:03:05 PM
Subject: Re: [Alchemi-users] Only one executor actually do its job
Hey Anh,
I just took a quick peek at it (gotta get to class here) but there is a
System.Net.Sockets.SocketException: No such host is known
showing up.
Try to ping the executors from the manager and see if that works.
Also, there is a bug in the manager/executor code where only the computer
name of the executor is stored in the database, not the whole FQDN. So if
an executor is named executor1.domain.edu , then only "executor1" is
stored in the database. This may be what's causing you problems. You can
get around this by putting an entry in C:\Windows\system32\drivers\etc\hosts
Sorry so brief -- let me know and I can explain this more, or I think
there was a post either on the forum or in the email lists about this kind
of thing a few months ago.
So it appears to be a networking issue where the manager can't find out
who the executors are.
Let me know what you find out
-Matt
On 3/30/07, Anh Nghia Nguyen <[EMAIL PROTECTED]> wrote:
>
> F.Y.I
>
> ----- Original Message ----
> From: Matt Valerio < [EMAIL PROTECTED]>
> To: Anh Nghia Nguyen <[EMAIL PROTECTED]>
> Cc: Reece Arnott <[EMAIL PROTECTED]>; "[email protected]"
> <[email protected]>
> Sent: Friday, March 30, 2007 7:13:49 PM
> Subject: Re: [Alchemi-users] Only one executor actually do its job
>
> Hi Anh,
>
> I'd take a look at the log files on both the Manager and the Executors
> to see if they will give you any more clues.
> They are in
> <Alchemi Path>\Manager\dat\
> and
> <Alchemi Path>\Executor\dat\
>
> If you really want to see what's going on,
> 1) Stop all executors
> 2) Stop the manager
> 3) Delete the \dat\ file on both the manager and executors
> 4) Start the manager
> 5) Start the executors
> 6) Try to start PiCalculator
>
> Then check the freshly-created log files and look for errors and
> exceptions.
>
> Let us know what you find.
>
> HTH,
> -Matt
>
>
> On 3/30/07, Anh Nghia Nguyen < [EMAIL PROTECTED]> wrote:
> >
> > hi Reece, Thanks for your reply
> > here are hints and what i did
> >
> > all .exe files are built from code and deployed (there're some errors
> > with install version)
> > all firewall (in manager and executors) are turned off
> > all executor are red in Alchemi Console
> > The example was used for experiment is PiCalculator with default
> > setting & parameter
> > Only the executor in the Manager machine actually do it's job
> > (80-90%CPU for Alchemi.Executor.exe process)
> >
> > Hope it's enough
> > Nghia Nguyen
> >
> >
> >
> > ----- Original Message ----
> > From: Reece Arnott < [EMAIL PROTECTED]>
> > To: Anh Nghia Nguyen <[EMAIL PROTECTED]>
> > Cc: " [email protected]"
<[email protected]
> > >
> > Sent: Friday, March 30, 2007 4:12:00 AM
> > Subject: Re: [Alchemi-users] Only one executer actually do its job
> >
> > At 06:00 a.m. 30/03/2007, Anh Nghia Nguyen wrote:
> > >hi all
> > >I attempt to setup a grid and it's well done
> > >but my grid consist of 3 executor
> > >When i run examples, only first executor actually do it's job (the
> > %CPU ~
> > >80-90 for process Alchemi.Executor.Exe)
> > >the others are 0% CPU
> > >In addition, if i stop/disconnect the first one, the grid is down, i
> > mean
> > >it do nothing when i run examples.
> > >
> > >Do i have to do some configuration?
> >
> > Most often the problem will be with a firewall.
> >
> > First thing to try is turning off all firewalls and seeing if it
> > works. If
> > it still doesn't then thats a red herring and its something more
> > complicated. If it works with all firewalls off you could try just
> > turning
> > them back on one at a time till something breaks or try a bit of
> > logic.
> >
> > If the executor thats working is on the same machine as the manager
> > then
> > I'd say it was probably the firewall on the manager that was the
> > problem,
> > otherwise its more likely to be the firewall settings on the
> > individual
> > executors.
> >
> > If you look in the Alchemi Console (comes with the SDK, under bin
> > folder)
> > under Console Root\Executors do you see the other 2 executors? Are
> > they
> > greyed out?
> >
> > If you don't see them then somethings wrong at their end and the
> > executor
> > never connected to the manager. If they are visible but greyed out
> > then
> > they connected to the manager at some point but are not currently
> > available
> > to run applications. In this case its most likely a firewall issue on
> > those
> > machines but it may be that you have the wrong version of the executor
> >
> > installed on these machines.
> >
> > -------------------------
> > Reece Arnott
> > Learning Environments Specialist
> > School of Business
> > University of Otago
> > Dunedin
> > New Zealand
> >
> > [EMAIL PROTECTED]
> > -------------------------
> >
> >
> >
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