[gem5-users] Running MPI code in gem5 se mode x86 architecture

[krishnan gosakan via gem5-users]

Hi all,
I hope everyone is fine. I am trying to run an MPI application in gem5 se
mode (latest master branch) with x86 arch. I am facing some problems while
running it. Below is the error message I get while doing so.

gem5 Simulator System.  http://gem5.org
gem5 is copyrighted software; use the --copyright option for
details.gem5 version 21.0.0.0
gem5 compiled Jun 28 2021 17:08:32
gem5 started Jun 28 2021 19:35:27
gem5 executing on cryptenious, pid 11295
command line: ./build/X86/gem5.opt configs/example/se.py -c
../gem5-master-iceberg-branch/apps/graph500-3.0.0/src/graph500_reference_bfs
'--options=21 16' --caches --l2cache --mem-size 4096MB --sys-clock
4GHz --l1d_size 32kB --l1i_size 32kB --l2_size 256kB --l3_size
8192kBwarn: membus.slave is deprecated. `slave` is now called
`cpu_side_ports`
warn: tol2bus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
Global frequency set at 1000000000000 ticks per second
warn: DRAM device capacity (8192 Mbytes) does not match the address
range assigned (4096 Mbytes)
0: system.remote_gdb: listening for remote gdb on port 7000
**** REAL SIMULATION ****
info: Entering event queue @ 0.  Starting simulation...
warn: ignoring syscall access(...)
warn: ignoring syscall access(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
info: Increasing stack size by one page.
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall access(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall mprotect(...)
warn: ignoring syscall set_robust_list(...)
warn: ignoring syscall rt_sigaction(...)
      (further warnings will be suppressed)
warn: ignoring syscall rt_sigprocmask(...)
      (further warnings will be suppressed)
warn: ignoring syscall get_mempolicy(...)
warn: ignoring syscall sched_getaffinity(...)
sysconf(NPROCESSORS_CONF) failed.
: No such file or directory
request to allocate mask for invalid number; abort
: No such file or directory
Exiting @ tick 1502877000 because exiting with last active thread context
Simulated exit code not 0! Exit code is 1


I tried running a very simple MPI program (which prints "hello world") with
gem5 and it also failed with same error. The source code is attached along
with this mail.

Any idea how to run MPI program in gem5 se mode?  Any suggestions are
welcomed.
Thank you.
-- 
Regards,
Krishnan.

#include <mpi.h>
#include <stdio.h>

int main(int argc, char** argv) {
    // Initialize the MPI environment
    MPI_Init(NULL, NULL);

    // Get the number of processes
    int world_size;
    MPI_Comm_size(MPI_COMM_WORLD, &world_size);

    // Get the rank of the process
    int world_rank ;
    MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

    // Get the name of the processor
    char processor_name[MPI_MAX_PROCESSOR_NAME];
    int name_len;
    MPI_Get_processor_name(processor_name, &name_len);

    // Print off a hello world message
    printf("Hello world from processor %s, rank %d out of %d processors\n",
           processor_name, world_rank, world_size);

    // Finalize the MPI environment.
    MPI_Finalize();
}

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