I just tested on my Mac, the system keep popping out message asking me to force kill some application to free up memory, but the code never crashed, just stalled. So I guess the out-of-memory behavior is operating system dependent. My guess is when you have multiple process competing for memory, it may cause some race issue in the os that the OS  returns a valid address but discover out-of memory later because the memory is stolen by another process.
 
— 
Hui Zhou
T: 630-252-3430








On Apr 3, 2019, at 8:42 AM, Zhen Wang via discuss <discuss@mpich.org> 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). mpich is built from source. The commands are as follows:

Build
g++ -I<mpich-3.3-opt/include> -L<mpich-3.3-opt/lib> -lmpi memory.cpp

Run
<mpich-3.3-opt/bin/mpiexec> -n 2 a.out

Output
0
0
1
1

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   PID 16067 RUNNING AT <machine name>
=   EXIT CODE: 9
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================
YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Killed (signal 9)
This typically refers to a problem with your application.
Please see the FAQ page for debugging suggestions

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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