Charm++ parallel programming system

[Hrushit Parikh <parikhhrushit AT hotmail.com>]

Hi,
I have attached an image of the full stacktrace from the debugger.
The same is thrown in the coredump by charmrun and is attached in the text file.

Thank you,
Hrushit

> From: mille121 AT illinois.edu
> Date: Tue, 17 Feb 2015 20:37:44 -0600
> Subject: Re: [charm] Unable to run UTS with projections
> To: parikhhrushit AT hotmail.com
> CC: charm AT cs.uiuc.edu
>
> Could you please post the full stack trace? The error likely lies
> further up the stack than the functions you named.
>
> On Tue, Feb 17, 2015 at 8:31 PM, Hrushit Parikh
> <parikhhrushit AT hotmail.com> wrote:
> > Hi,
> > Thank you, upgrading to charm-6.6.1 worked. I am able to link the UTS code
> > with projections and generate analysis data.
> >
> > However, when I tried to run UTS with -tracemode projections and my modified
> > cldb.workstealing.c "seed balancer" I run into a segmentation fault. I have
> > been trying to do a stack backtrace analysis and debug it since couple of
> > days. Here is what I have:
> >
> > The CopyMsg function in machine-common-core.c throws an error (address out
> > of bounds) while doing a memcpy:
> >
> > ************************************************
> > /* Utiltiy functions */
> > static char *CopyMsg(char *msg, int len) {
> > char *copy = (char *)CmiAlloc(len);
> > #if CMK_ERROR_CHECKING
> > if (!copy) {
> > CmiAbort("Error: out of memory in machine layer\n");
> > }
> > #endif
> > memcpy(copy, msg, len);
> > return copy;
> > }
> >
> > The values of copy, msg and len are:
> >
> > copy: 0x2aaac0ce0020""
> > len: 50331728
> > msg: 0xe25940""
> >
> > *************************************************
> >
> > Seeing the length it is most likely that we are trying to ask for too big a
> > chunk of memory. I tracked back the char *msg in the above code to envelope
> > *env in function CkCreateGroup(...) in file ck.C
> >
> > What parameters is env storing that it has a length of 50331728 ? What data
> > from the converse run time system, especially the seed balancer does it take
> > which could be causing this error, because my changes are primarily in the
> > workstealing seed balancer.
> >
> > Thank you in advance.
> >
> > PS: My seed balancer works fine if I do not link projections to the UTS
> > code.
> >
> >> From: mille121 AT illinois.edu
> >> Date: Sun, 15 Feb 2015 19:52:36 -0600
> >> Subject: Re: [charm] Unable to run UTS with projections
> >> To: parikhhrushit AT hotmail.com
> >> CC: charm AT cs.uiuc.edu
> >>
> >> Hi Hrushit,
> >>
> >> The first recommendation I would give is to use the current stable
> >> release of Charm++, 6.6.1:
> >> http://charm.cs.illinois.edu/distrib/charm-6.6.1.tar.gz
> >>
> >> Numerous bug-fixes and improvements have been made since version 6.5.1
> >> came out, and it's often unproductive to try to diagnose an error
> >> that's already been fixed.
> >>
> >> Thanks,
> >>
> >> Phil Miller
> >>
> >> On Sun, Feb 15, 2015 at 7:18 PM, Hrushit Parikh
> >> <parikhhrushit AT hotmail.com> wrote:
> >> > Hi,
> >> > I am trying to get projections analysis on the UTS benchmark (Tree T1L)
> >> > in
> >> > charm++ using the "-tracemode projections" option. I use the
> >> > workstealing
> >> > seed balancer.
> >> >
> >> > I am using charm-6.5.1 version on the UT Austin Stampede cluster. The
> >> > stampede cluster uses ibrun to launch the executable. I have compiled
> >> > charm
> >> > using ./build charm++ mpi-linux-x86_64 mpicxx -j16.
> >> >
> >> > With 256 Processors, the T1L run takes only 0.3 seconds when I compile
> >> > charm
> >> > with the "--with-production" option (to disable traces). However, with
> >> > traces enabled the execution time exceeds 15 minutes and I have to kill
> >> > the
> >> > program.
> >> >
> >> > I tried running NQueens with the same workstealing balancer on 256
> >> > Processors with traces enabled. For queens upto 19 (grainsize=3) it runs
> >> > fine and projections data is generated, but with 20 queens it takes
> >> > forever.
> >> >
> >> > Any ideas why UTS takes forever with traces enabled or am I missing
> >> > something?
> >> >
> >> > Thank you,
> >> > Hrushit
> >> >
> >> > _______________________________________________
> >> > charm mailing list
> >> > charm AT cs.uiuc.edu
> >> > http://lists.cs.uiuc.edu/mailman/listinfo/charm
> >> >
> >
> > _______________________________________________
> > charm mailing list
> > charm AT cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/charm
> >

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