pnetcdf 1.2.0 create file issue
David Knaak
knaak at cray.com
Mon May 21 09:06:17 CDT 2012
Hi Jim,
Thanks for the additional information. I'll begin working on it.
David
On Sat, May 19, 2012 at 07:23:24AM -0600, Jim Edwards wrote:
> Hi David,
>
> I built the pnetcdf 1.3.0-pre1 release on bluewaters and
> ran the nf_test provided with that package. It exhibits the same issues with
> nfmpi_create and nfmpi_open that I am seeing from the installed
> parallel-netcdf-1.2.0 and my application.
> I have opened ticket BWDSPCH-298 on bluewaters to track this issue.
>
> On Fri, May 11, 2012 at 6:50 PM, David Knaak <knaak at cray.com> wrote:
>
> Jim,
>
> I'm not intimate with pnetcdf but the stack trace entries look a little
> strange to me. In particular:
>
> #10
> count=0x1527daa0, stride=0x0
>
> #13
> start=0x7fffffff3750, count=0x7fffffff3750
>
> Could it be that the high level routine is being called with a bad
> argument?
>
> Just a thought.
>
> David
>
> On Fri, May 11, 2012 at 05:37:24PM -0600, Jim Edwards wrote:
> > Hi David,
> >
> > I've updated to the 5.2.5 mpich2 on bluewaters and now get a different
> problem,
> > it happens earlier in the code so I think that this worked in the older
> > version, here is a partial stack trace from the core file on 16000 tasks.
> > I'll try on Monday to reproduce this on a smaller number of tasks. Can
> I
> > send you more info when I get it?
> >
> > #0 memcpy () at ../sysdeps/x86_64/memcpy.S:102
> > #1 0x0000000000c25b03 in MPIDI_CH3U_Buffer_copy ()
> > #2 0x0000000000bc91ae in MPIDI_Isend_self ()
> > #3 0x0000000000bc5ef4 in MPID_Isend ()
> > #4 0x0000000000be4b2b in PMPI_Isend ()
> > #5 0x0000000000b9439a in ADIOI_CRAY_R_Exchange_data ()
> > #6 0x0000000000b9503d in ADIOI_CRAY_Read_and_exch ()
> > #7 0x0000000000b957ca in ADIOI_CRAY_ReadStridedColl ()
> > #8 0x0000000000b7ea69 in MPIOI_File_read_all ()
> > #9 0x0000000000b7eab6 in PMPI_File_read_all ()
> > #10 0x0000000000b3d7ce in ncmpii_getput_vars (ncp=0x107192b0, varp=
> 0x109ee340,
> > start=0x15269910, count=0x1527daa0, stride=0x0,
> > buf=0x155f5480, bufcount=245561, datatype=-871890885, rw_flag=1,
> io_method=
> > 1) at ./getput_vars.c:741
> > #11 0x0000000000b39804 in ncmpi_get_vara_all (ncid=1, varid=59, start=
> > 0x15269910, count=0x1527daa0, buf=0x155f5480,
> > bufcount=245561, datatype=-871890885) at ./getput_vara.c:435
> > #12 0x0000000000b092c6 in nfmpi_get_vara_all_ (v1=0x33e8dd8, v2=
> 0x33e89a0, v3=
> > 0x418d500, v4=0x418c500, v5=0x155f5480,
> > v6=0x1e72e10, v7=0x1e72e04) at ./get_vara_allf.c:57
> > #13 0x00000000007c0524 in pionfread_mod::read_nfdarray_double (file=...,
> iobuf=
> > 0x155f5480, vardesc=..., iodesc=...,
> > start=0x7fffffff3750, count=0x7fffffff3750)
> >
> >
> > On Fri, May 11, 2012 at 5:25 PM, Jim Edwards <jedwards at ucar.edu> wrote:
> >
> > David,
> >
> > I will give this a try, thanks.
> >
> >
> > On Fri, May 11, 2012 at 5:15 PM, David Knaak <knaak at cray.com> wrote:
> >
> > Rob,
> >
> > I suggested taking the discussion off line to not bother those
> not
> > interested in the Cray specifics. But if you think those on the
> list
> > are either interested, or don't consider it a bother, I can
> certainly
> > use the full list.
> >
> > All,
> >
> > In the MPT 5.4.0 release, I made some changes to MPI_File_open to
> > improve scalability. Because of these changes and previous
> changes
> > I had made (for added functionality, not because of any bugs),
> the
> > code was getting very messy. In fact, I introduced a bug or 2
> with
> > these changes. So in 5.4.3, I significantly restructured the
> code
> > for better maintainability, fixed the bugs (that I knew of) and
> made
> > more scalability changes.
> >
> > Jim,
> >
> > The NCSA's "ESS" has the 5.4.2 version of Cray's MPI
> implementation as
> > default. The "module list" command output that you included
> shows:
> >
> > 3) xt-mpich2/5.4.2
> >
> > The "module avail xt-mpch2" command shows what other versions are
> > available:
> >
> > h2ologin2 25=>module avail xt-mpich2
> > --------------------- /opt/cray/modulefiles ---------------------
> > xt-mpich2/5.4.2(default) xt-mpich2/5.4.4 xt-mpich2/
> 5.4.5
> >
> > Would you switch to 5.4.5, relink, and try again?
> >
> > h2ologin2 25=>module swap xt-mpich2/5.4.2 xt-mpich2/5.4.5
> >
> > Thanks.
> > David
> >
> >
> > On Fri, May 11, 2012 at 12:54:39PM -0500, Rob Latham wrote:
> > > On Fri, May 11, 2012 at 11:46:25AM -0500, David Knaak wrote:
> > > > Jim,
> > > >
> > > > Since you are having this problem on a Cray system, please
> open a
> > Cray
> > > > bug report against MPI and I will look at it. We can take
> further
> > > > discussions off line.
> > >
> > > Oh, howdy David! forgot you were on the list. Thanks for
> keeping an
> > > eye on things.
> > >
> > > the pnetcdf list is pretty low-traffic these days, but we have
> an
> > > awful lot of users in a cray and Lustre environment. If you'd
> > rather
> > > discuss cray specific stuff elsewhere, I'd understand, but
> please let
> > > us know what you figure out.
> > >
> > > ==rob
> > >
> > > > Thanks.
> > > > David
> > > >
> > > > On Fri, May 11, 2012 at 10:03:28AM -0600, Jim Edwards wrote:
> > > > >
> > > > >
> > > > > On Fri, May 11, 2012 at 9:43 AM, Rob Latham <
> robl at mcs.anl.gov>
> > wrote:
> > > > >
> > > > > On Thu, May 10, 2012 at 03:28:57PM -0600, Jim Edwards
> wrote:
> > > > > > This occurs on the ncsa machine bluewaters. I am
> using
> > pnetcdf1.2.0 and
> > > > > > pgi 11.10.0
> > > > >
> > > > > need one more bit of information: the version of MPT
> you are
> > using.
> > > > >
> > > > >
> > > > > Sorry, what's mpt? MPI?
> > > > > Currently Loaded Modulefiles:
> > > > > 1) modules/3.2.6.6 9)
> > > > > user-paths 17) xpmem/
> > 0.1-2.0400.31280.3.1.gem
> > > > > 2) xtpe-network-gemini 10) pgi/
> > > > > 11.10.0 18) xe-sysroot/4.0.46
> > > > > 3) xt-mpich2/5.4.2 11) xt-libsci/
> > > > > 11.0.04 19) xt-asyncpe/5.07
> > > > > 4) xtpe-interlagos 12) udreg/
> > > > > 2.3.1-1.0400.4264.3.1.gem 20) atp/1.4.1
> > > > > 5) eswrap/1.0.12 13) ugni/
> > > > > 2.3-1.0400.4374.4.88.gem 21) PrgEnv-pgi/4.0.46
> > > > > 6) torque/2.5.10 14) pmi/
> > > > > 3.0.0-1.0000.8661.28.2807.gem 22) hdf5-parallel/1.8.7
> > > > > 7) moab/6.1.5 15) dmapp/
> > > > > 3.2.1-1.0400.4255.2.159.gem 23) netcdf-hdf5parallel/
> 4.1.3
> > > > > 8) scripts 16) gni-headers/
> > > > > 2.1-1.0400.4351.3.1.gem 24) parallel-netcdf/1.2.0
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > > The issue is that calling nfmpi_createfile would
> sometimes
> > result in an
> > > > > > error:
> > > > > >
> > > > > > MPI_File_open : Other I/O error , error stack:
> > > > > > (unknown)(): Other I/O error
> > > > > > 126: MPI_File_open : Other I/O error , error stack:
> > > > > > (unknown)(): Other I/O error
> > > > > > Error on create : 502 -32
> > > > > >
> > > > > > The error appears to be intermittent and I could not
> get it
> > to occur at
> > > > > all
> > > > > > on a small number of tasks (160) but it occurs with
> high
> > frequency when
> > > > > > using a larger number of tasks (>=1600). I traced
> the
> > problem to the
> > > > > use
> > > > > > of nf_clobber in the mode argument, removing the
> nf_clobber
> > seems to have
> > > > > > solved the problem and I think that create implies
> clobber
> > anyway doesn't
> > > > > > it?
> > > > >
> > > > > > Can someone who knows what is going on under the
> covers
> > enlighten me
> > > > > > with some understanding of this issue? I suspect
> that one
> > task is
> > > > > trying
> > > > > > to clobber the file that another has just created or
> > something of that
> > > > > > nature.
> > > > >
> > > > > Unfortunately, "under the covers" here means "inside
> the
> > MPI-IO
> > > > > library", which we don't have access to.
> > > > >
> > > > > in the create case we call MPI_File_open with
> "MPI_MODE_RDWR
> > |
> > > > > MPI_MODE_CREATE", and if noclobber set, we add
> > MPI_MODE_EXCL.
> > > > >
> > > > > OK, so that's pnetcdf. What's going on in MPI-IO?
> Well,
> > cray's based
> > > > > their MPI-IO off of our ROMIO, but I'm not sure which
> > version.
> > > > >
> > > > > Let me cook up a quick MPI-IO-only test case you can
> run to
> > trigger
> > > > > this problem and then you can beat cray over the head
> with
> > it.
> > > > >
> > > > >
> > > > >
> > > > > Sounds good, thanks.
> > > > >
> > > > >
> > > > > ==rob
> > > > >
> > > > > --
> > > > > Rob Latham
> > > > > Mathematics and Computer Science Division
> > > > > Argonne National Lab, IL USA
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Jim Edwards
> > > > >
> > > > > CESM Software Engineering Group
> > > > > National Center for Atmospheric Research
> > > > > Boulder, CO
> > > > > 303-497-1842
> > > > >
> > > >
> > >
> > > --
> > > Rob Latham
> > > Mathematics and Computer Science Division
> > > Argonne National Lab, IL USA
> >
> > --
> >
> >
> >
> >
> > --
> > Jim Edwards
> >
> > CESM Software Engineering Group
> > National Center for Atmospheric Research
> > Boulder, CO
> > 303-497-1842
> >
> >
> >
> >
> >
> > --
> > Jim Edwards
> >
> > CESM Software Engineering Group
> > National Center for Atmospheric Research
> > Boulder, CO
> > 303-497-1842
> >
>
> --
>
>
>
>
> --
> Jim Edwards
>
> CESM Software Engineering Group
> National Center for Atmospheric Research
> Boulder, CO
> 303-497-1842
>
--
More information about the parallel-netcdf
mailing list