Denny Frost wrote:
I didn't do the install myself, so I'm not sure what options they used. What potentially could have gone wrong?


Tons of things. Most directly, forgetting --enable-mpi during configuration, but then specifying the _mpi program suffix and continuing to compile mdrun.

-Justin

On Fri, Jan 28, 2011 at 3:49 PM, Justin A. Lemkul <jalem...@vt.edu <mailto:jalem...@vt.edu>> wrote:



    Denny Frost wrote:

        I tried using mpiexec -n 8 mdrun_mpi, but I still can't get the
        output to that it used anything but just 1 Node.  Is there
        something I was supposed to specify in the grompp command?


    No, grompp has nothing to do with parallelization (at least, not
    since version 3.3.3).  Are you sure the mdrun executable was
    properly compiled with MPI support?  I believe mpiexec will happily
    run a serial version of mdrun over all the processors, rather than
    invoke the properly-compiled one.

    -Justin

        On Fri, Jan 28, 2011 at 3:43 PM, Justin A. Lemkul
        <jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>> wrote:



           Denny Frost wrote:

               In the log file, when gromacs specifies "Nodes," does it mean
               processors?


           Yes.  For instance, on my dual-core workstation, the "nodes" are
           correctly reported as 2.

           -Justin

               On Fri, Jan 28, 2011 at 1:44 PM, Justin A. Lemkul
               <jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>> wrote:



                  Denny Frost wrote:

                      I'm leaning toward the possibility that it is
        actually only
                      running 8 copies of the same job on different
        processors.  My
                      question is how does gromacs4.5 know how many
        processors
               it has
                      available to parallelize a job?  Is it specified
        in grompp or
                      does it just detect it?


                  If you're using MPI, it comes from
        mpiexec/mpirun/whatever.
                Setting
                  a proper flag there is what tells mdrun how many nodes
        to use.

                  -Justin

                      On Fri, Jan 28, 2011 at 1:32 PM, Justin A. Lemkul
                      <jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>
                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>> wrote:



                         Denny Frost wrote:

                             Here's my grompp command:

                             grompp_d -nice 0 -v -f md.mdp -c
        ReadyForMD.gro -o
               md.tpr
                      -p top.top

                             and my mdrun command is this:
                             time mpiexec mdrun_mpi -np 8 -cpt 30000 -nice 0
               -nt 1 -s
                             $PBS_O_WORKDIR/md.tpr -o
        $PBS_O_WORKDIR/mdDone.trr -x
                             $PBS_O_WORKDIR/mdDone.xtc -c
               $PBS_O_WORKDIR/mdDone.gro -e
                             $PBS_O_WORKDIR/md.edr -g
        $PBS_O_WORKDIR/md.log 1>
                             $PBS_JOBID.pgm.out 4> $PBS_JOBID.pgm.err


                         The -np option of mdrun is nonexistent, but
        mdrun does not
                      check for
                         proper command line arguments, so you won't get
        an error.
                       But then
                         you've said that 8 processors are active, so I
        still
               suspect that
                         mdrun was compiled incorrectly or in such a way
        that it's
                         incompatible with your system.  The output from the
               .log file
                         indicates that only one processor was used.
         Maybe your
                      admins can
                         help you on this one, if the jobs spit out any
        useful
               diagnostic
                         information.

                         For our cluster, we use e.g.:

                         mpirun -np 8 mdrun_mpi -deffnm md

                         -Justin

                             I know the -cpt option is 30000 because I
        don't want a
                             checkpoint file because every time it tries to
               make it,
                      it fails
                             due to quota issues and kills the job.  I'm not
               sure why this
                             happens, but I think it's a separate issue
        to take
               up with my
                             supercomputing facility.

                             On Fri, Jan 28, 2011 at 1:18 PM, Justin A.
        Lemkul
                             <jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>
                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>
                             <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu> <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>
                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>>> wrote:



                                Denny Frost wrote:

                                    all 8 nodes are running at full
        capacity,
               though


                                What is your mdrun command line?  How
        did you
               compile it?
                              What can
                                happen is something went wrong during
               installation, so you
                             think you
                                have an MPI-enabled binary, but it is simply
               executing 8
                             copies of
                                the same job.

                                -Justin

                                    On Fri, Jan 28, 2011 at 1:13 PM,
        Justin A.
               Lemkul
                                    <jalem...@vt.edu
        <mailto:jalem...@vt.edu> <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
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                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>
                             <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu> <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>
                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>>
                                    <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>
                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>
                             <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu> <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>
                      <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>>>> wrote:



                                       Denny Frost wrote:

                                           Here's what I've got:

                                           M E G A - F L O P S   A C C O
        U N T
               I N G

                                             RF=Reaction-Field  FE=Free
        Energy
                              SCFE=Soft-Core/Free
                                    Energy
T=Tabulated W3=SPC/TIP3p W4=TIP4p
                             (single or
                                    pairs)
                                             NF=No Forces

Computing: M-Number
                                                   M-Flops  % Flops
----------------------------------------------------------------------------- Coul(T) + VdW(T) 1219164.751609
                                              82903203.109    80.6
Outer nonbonded loop 25980.879385
                                                259808.794     0.3
Calc Weights 37138.271040
                                               1336977.757     1.3
Spread Q Bspline 792283.115520
                                               1584566.231     1.5
Gather F Bspline 792283.115520
                                               4753698.693     4.6
3D-FFT 119163.856212
                                                953310.850     0.9
Solve PME 2527.465668
                                                161757.803     0.2
NS-Pairs 47774.705001
                                               1003268.805     1.0
Reset In Box 371.386080
                                                  1114.158     0.0
Shift-X 24758.847360
                                                148553.084     0.1
CG-CoM 1237.953600
                                                  3713.861     0.0
Angles 18569.135520
                                               3119614.767     3.0
Propers 14855.308416
                                               3401865.627     3.3
Impropers 3094.855920
                                                643730.031     0.6
Virial 1242.417375
                                                 22363.513     0.0
Stop-CM 1237.953600
                                                 12379.536     0.0
P-Coupling 12379.423680
                                                 74276.542     0.1
Calc-Ekin 12379.436160
                                                334244.776     0.3
Lincs 11760.476208
                                                705628.572     0.7
Lincs-Mat 245113.083072
                                                980452.332     1.0
Constraint-V 23520.928704
                                                188167.430     0.2
Constraint-Vir 11760.452496
                                                282250.860     0.3
----------------------------------------------------------------------------- Total 102874947.133 100.0 -----------------------------------------------------------------------------


                                               R E A L   C Y C L E   A N
        D   T
               I M E          A C C
                             O U N T
                                    I N G

Computing: Nodes Number
                          G-Cycles
                                       Seconds     %
----------------------------------------------------------------------- Neighbor search 1 99195 8779.027 3300.3
                                          3.8
Force 1 991941 188562.885
                                       70886.8           81.7
PME mesh 1 991941 18012.830 6771.6
                                         7.8
Write traj. 1 41 16.835 6.3
                                                    0.0
Update 1 991941
                          2272.379
                                         854.3              1.0
Constraints 1 991941
                         11121.146                   4180.8     4.8
Rest 1 2162.628 813.0 0.9 ----------------------------------------------------------------------- Total 1 230927.730 86813.1 100.0 ----------------------------------------------------------------------- ----------------------------------------------------------------------- PME spread/gather 1 1983882
                                  17065.384           6415.4   7.4
PME 3D-FFT 1 1983882 503.340 189.2
                                               0.2
                                            PME solve                  1
991941 427.136 160.6 0.2 -----------------------------------------------------------------------

                                           Does that mean it's only
        using 1 node?
                       That would
                                    explain the
                                           speed issues.


                                       That's what it looks like to me.


                                       -Justin

-- ========================================

                                       Justin A. Lemkul
                                       Ph.D. Candidate
                                       ICTAS Doctoral Scholar
                                       MILES-IGERT Trainee
                                       Department of Biochemistry
                                       Virginia Tech
                                       Blacksburg, VA
                                       jalemkul[at]vt.edu
        <http://vt.edu> <http://vt.edu>
               <http://vt.edu>
                      <http://vt.edu> <http://vt.edu>
                             <http://vt.edu> | (540)

                                    231-9080

http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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-- ========================================

                                Justin A. Lemkul
                                Ph.D. Candidate
                                ICTAS Doctoral Scholar
                                MILES-IGERT Trainee
                                Department of Biochemistry
                                Virginia Tech
                                Blacksburg, VA
                                jalemkul[at]vt.edu <http://vt.edu>
        <http://vt.edu>
               <http://vt.edu> <http://vt.edu>
                      <http://vt.edu> | (540)
                             231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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                         --     ========================================

                         Justin A. Lemkul
                         Ph.D. Candidate
                         ICTAS Doctoral Scholar
                         MILES-IGERT Trainee
                         Department of Biochemistry
                         Virginia Tech
                         Blacksburg, VA
                         jalemkul[at]vt.edu <http://vt.edu>
        <http://vt.edu> <http://vt.edu>
               <http://vt.edu> | (540)
                      231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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                  --     ========================================

                  Justin A. Lemkul
                  Ph.D. Candidate
                  ICTAS Doctoral Scholar
                  MILES-IGERT Trainee
                  Department of Biochemistry
                  Virginia Tech
                  Blacksburg, VA
                  jalemkul[at]vt.edu <http://vt.edu> <http://vt.edu>
        <http://vt.edu> | (540)
               231-9080
                  http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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           --     ========================================

           Justin A. Lemkul
           Ph.D. Candidate
           ICTAS Doctoral Scholar
           MILES-IGERT Trainee
           Department of Biochemistry
           Virginia Tech
           Blacksburg, VA
           jalemkul[at]vt.edu <http://vt.edu> <http://vt.edu> | (540)
        231-9080
           http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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-- ========================================

    Justin A. Lemkul
    Ph.D. Candidate
    ICTAS Doctoral Scholar
    MILES-IGERT Trainee
    Department of Biochemistry
    Virginia Tech
    Blacksburg, VA
    jalemkul[at]vt.edu <http://vt.edu> | (540) 231-9080
    http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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