Thanks for the explanation, Rohan! It was very helpful.
Marisel
2017-12-08 13:17 GMT-03:00 Rohan Garg <rohg...@ccs.neu.edu>:
> Hi Marisel,
>
> By default, the DMTCP coordinator process binds to and uses port 7779. If
> you
> don't specify any port (for example, `dmtcp_coorditor -i 10`), the
> coordinator
> process will use port 7779. Since you already have coordinator that's
> using this
> port on terminal-1, the second coordinator process cannot re-ruse it. You
> need
> to specify a different port for the second coordinator (on terminal-2):
>
> $ dmtcp_coordinator -p <XXXX> ... # other options
>
> When you run your program under dmtcp_launch, you'd have to specify the
> coordinator port explicitly.
>
> $ dmtcp_launch --join --coord-port <XXXX> ./a.out ... # other options
>
> You can also let the coordinator process pick a free port on its own using
> `-p 0`.
> It'll list the port it is using on the terminal, and then you can ask
> dmtcp_launch/restart
> to join with the coordinator you want (by using "--coord-port <XXXX>").
>
> -Rohan
>
> ----- Original Message -----
> From: "Marisel Di Pietro" <marisel....@gmail.com>
> To: "dmtcp-forum" <dmtcp-forum@lists.sourceforge.net>
> Sent: Thursday, December 7, 2017 7:52:49 AM
> Subject: [Dmtcp-forum] Start two instances of coordinator
>
> Hello!
>
> I'm trying to start working with the checkpoint plugin. I read in the
> quick start that for each process I have to start a different coordinator,
> but when I try to do so I get an error message.
>
> This is what I'm doing:
> I open a terminal in the folder I want to work in and write:
> dmtcp_coordinator -i 10 --ckptdir 'pwd'
> There, in a new terminal, I'm going to launch one process.
> Then, I open a terminal in another folder where I want to run the other
> process and I run the same command.
> There, I got the error: "address already in use", this may be an old
> coordinator, etc.
>
> Obviously, I'm doing something wrong. Could anyone explain for beginners
> what's the correct way to use the coordinator?
>
> Thanks in advance!!
>
> Cheers,
> Marisel
>
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