def start_tasks()

in submitit/local/local.py [0:0]


    def start_tasks(self) -> None:
        self.folder.mkdir(exist_ok=True)
        paths = [utils.JobPaths(self.folder, self.pid, k) for k in range(self.ntasks)]
        self.stdouts = [p.stdout.open("a") for p in paths]
        self.stderrs = self.stdouts if self.stderr_to_stdout else [p.stderr.open("a") for p in paths]
        for k in range(self.ntasks):
            env = dict(os.environ)
            env.update(
                SUBMITIT_LOCAL_LOCALID=str(k), SUBMITIT_LOCAL_GLOBALID=str(k), SUBMITIT_LOCAL_JOB_ID=self.pid
            )
            self.tasks.append(
                subprocess.Popen(  # pylint: disable=consider-using-with
                    self.command,
                    shell=False,
                    env=env,
                    stderr=self.stderrs[k],
                    stdout=self.stdouts[k],
                    encoding="utf-8",
                )
            )