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 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Dmtcp-forum mailing list Dmtcp-forum@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dmtcp-forum ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Dmtcp-forum mailing list Dmtcp-forum@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dmtcp-forum
