Hi Carsten and Berk, Your fixes did the trick. Man, there is some great scaling on the CVS version now! Thanks a lot for the help!
/ Erik ons 2008-01-23 klockan 09:20 +0100 skrev Berk Hess: > > > ---------------------------------------- > > Date: Tue, 22 Jan 2008 20:15:03 +0100 > > From: [EMAIL PROTECTED] > > To: [email protected] > > Subject: [Fwd: Re: [gmx-users] mdrun CVS version crashes instantly when run > > across nodes in parallel] > > > > Hi Erik, > > > > I have made a test with today's CVS version and I also run into the > > problem you described. It happens as soon as one uses more than one node > > and at the same time more than one process per node. > > > > The problem seems to be in gmx_sumd where in the two-step summation in a > > call to MPI_Allreduce the variable cr->nc.comm_inter happens to be a > > NULL pointer, which should clearly not be. > > > > The inter-node communicator is freed in gmx_setup_nodecomm (network.c, > > line 393) if an intra-node communicator is present - I do not understand > > why the communicator is freed here. > > > > Maybe Berk can help us on that? If I comment out the MPI_Comm_free the > > code runs happily - haven't checked the results, though. > > > > Carsten > > Ah, there is a "typo" in the conditional, it should be rank_intra iso > comm_intra. > I have committed the fix. > > Thanks, > > Berk. > > _________________________________________________________________ > Express yourself instantly with MSN Messenger! Download today it's FREE! > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ -- Erik Brandt <[EMAIL PROTECTED]> KTH
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