Zhen,
The "problem" you're running into is memory overcommit [1]. The system
will happily hand you a pointer to memory upon calling malloc without
actually allocating the pages (that's the first step in
std::vector::resize) and then terminate your application as soon as it
tries to actually allocate them if the system runs out of memory. This
happens in std::vector::resize too, which sets each entry in the vector
to it's initial value. There is no way you can catch that. You might
want to try to disable overcommit in the kernel and see if
std::vector::resize throws an exception because malloc fails.
HTH,
Joseph
[1] https://www.kernel.org/doc/Documentation/vm/overcommit-accounting
On 4/3/19 3:26 PM, Zhen Wang wrote:
Hi,
I have difficulty catching std::bac_alloc in an MPI environment. The
code is attached. I'm uisng gcc 6.3 on SUSE Linux Enterprise Server 11
(x86_64). OpenMPI is built from source. The commands are as follows:
*Build*
g++ -I<openmpi-4.0.0-opt/include> -L<openmpi-4.0.0-opt/lib> -lmpi memory.cpp
*Run*
<openmpi-4.0.0-opt/bin/mpiexec> -n 2 a.out
*Output*
0
0
1
1
--------------------------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpiexec noticed that process rank 0 with PID 0 on node cdcebus114qa05
exited on signal 9 (Killed).
--------------------------------------------------------------------------
If I uncomment the line //if (rank == 0), i.e., only rank 0 allocates
memory, I'm able to catch bad_alloc as I expected. It seems that I am
misunderstanding something. Could you please help? Thanks a lot.
Best regards,
Zhen
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