From: Eric Roman (ERoman_at_lbl_dot_gov)
Date: Wed May 19 2004 - 09:48:03 PDT
Kevin Best I can tell, this is an error coming from LAM. It looks like the "Error in exec" message is produced by crtcp when it fails to exec a new mpirun. Most likely reason for exec() to fail is that the executable wasn't found. I'd check the path that the MPI app is using. Make sure it includes mpirun. - E On Wed, May 19, 2004 at 10:07:21AM -0500, Kevin wrote: > Dear Sir, > > I used lam7.0.4 combined with blcr-0.2.0 to perform checkpoint mpi program. It works fine with single program and MPI program running on one node before.Today when I tried to checkpoint a MPI program (the "hello" program under example directory with LAM package)running on one node of our cluster, the MPI program could be checkpointed and context file is saved. But when I try to restart it, it returns "Error in exec" to the screen.I can't figure out where the problem is.Could you please give me some suggestion? > > Below are some information on my operation and configuration: > > [kevin@Sparrow-01-02 ~/src]mpirun C ./hello > //it works fine and information displayed at console 1, > > [kevin@Sparrow-01-02 ~/src] getpid mpirun > //I got the pid of mpirun with a script "getpid" from console 2, assumed it is 344 > > [kevin@Sparrow-01-02 ~/src]cr_checkpoint 344 > //checkpoint the ./hello from console2, it works fine, the context.344 is saved to disk > > [kevin@Sparrow-01-02 ~/src]cr_restart context.344 > Error in exec > > ---below are configurations---------------------------------- > [kevin@Sparrow-01-02 ~/src]lamnodes > n0 Sparrow-01-02.ERC.MsState.Edu:1:origin,this_node > > [kevin@Sparrow-01-02 ~/src]laminfo > LAM/MPI: 7.0.4 > Prefix: /home/kevin/LAM > Architecture: i686-pc-linux-gnu > Configured by: kevin > Configured on: Mon May 3 15:45:08 CDT 2004 > Configure host: Sparrow-01-01.ERC.MsState.Edu > C bindings: yes > C++ bindings: yes > Fortran bindings: yes > C profiling: yes > C++ profiling: yes > Fortran profiling: yes > ROMIO support: yes > IMPI support: no > Debug support: no > Purify clean: no > SSI boot: globus (Module v0.5) > SSI boot: rsh (Module v1.0) > SSI coll: lam_basic (Module v7.0) > SSI coll: smp (Module v1.0) > SSI rpi: crtcp (Module v1.0.1) > SSI rpi: lamd (Module v7.0) > SSI rpi: sysv (Module v7.0) > SSI rpi: tcp (Module v7.0) > SSI rpi: usysv (Module v7.0) > SSI cr: blcr (Module v1.0.1) > > > -- Eric Roman Computational Research Division 510-486-6420 Berkeley Lab