Thanks a lot for the helpful advice.
If I pass a custom max_num_threads to the constructor of mpi_init, then I
get
the following behavior:
- Segmentation violation, when max_num_threads = 3, 4,
numbers::invalid_unsigned_int
- Normal execution, when max_num_threads = 1, 2, 5, 6, 7, 8, 9, 10
P.S.: My computer has a dual core CPU with hyper-threading, so in
/proc/cpuinfo
it shows 4 processors.
When running in GDB, all segmentation violation cases above give the same
message,
which points to the same position where the invalid read happens according
to valgrind:
Thread 1 "test" received signal SIGSEGV, Segmentation fault.
tbb::internal::generic_scheduler::allocate_task
(this=this@entry=0x7fffb8736600,
number_of_bytes=number_of_bytes@entry=8, parent=parent@entry=0x0,
context=context@entry=0x7ffff1e5c0a0 <tbb::internal::the_dummy_context>)
at ../../src/tbb/scheduler.cpp:315
315 ../../src/tbb/scheduler.cpp: No such file or directory.
On Friday, December 2, 2016 at 11:35:34 PM UTC+8, Wolfgang Bangerth wrote:
>
> On 12/02/2016 04:12 AM, JxW wrote:
> >
> > The following code reproduces this problem for me
> > (The CMakeLists.txt simply calls the DEAL_II_INVOKE_AUTOPILOT() macro):
> >
> > #include <iostream>
> > #include <deal.II/base/mpi.h>
> >
> > intmain (int argc, char *argv[]) {
> > dealii::Utilities::MPI::MPI_InitFinalize mpi_init (argc, argv);
> > std::cout << "Program runs normally." << std::endl;
> > return 0;
> > }
> >
> > Initially I suspected that the mpi_init object might be optimized away
> by the
> > compiler. But adding volatile to its
> > declaration does not fix this. Now I still do not know what is causing
> the
> > problem. Any help or suggestion is appreciated.
>
> Does this also happens with just a single processor? If you run this in a
> debugger, can you get a backtrace that shows where the problem happens?
>
> Best
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: [email protected]
> <javascript:>
> www: http://www.math.colostate.edu/~bangerth/
>
>
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