[Pw_forum] [qe-gpu]

[Anubhav Kumar]

Dear QE users

I have configured qe-gpu 14.10.0 with espresso-5.1.2.Parallel compilation
was successful, but when i run ./pw-gpu.x it gives the following output

***WARNING: unbalanced configuration (1 MPI per node, 3 GPUs per node)

     *******************************************************************

       GPU-accelerated Quantum ESPRESSO (svn rev. unknown)
       (parallel: Y , MAGMA : N )

     *******************************************************************


     Program PWSCF v.5.1.2 starts on 13Jun2015 at 15:23:59

     This program is part of the open-source Quantum ESPRESSO suite
     for quantum simulation of materials; please cite
         "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);
          URL http://www.quantum-espresso.org",
     in publications or presentations arising from this work. More details at
     http://www.quantum-espresso.org/quote

     Parallel version (MPI & OpenMP), running on      24 processor cores
     Number of MPI processes:                 1
     Threads/MPI process:                    24
     Waiting for input...


However when i again run the same command, it gives

***WARNING: unbalanced configuration (1 MPI per node, 3 GPUs per node)

Program received signal SIGSEGV: Segmentation fault - invalid memory
reference.

Backtrace for this error:
#0  0x7FB5001B57D7
#1  0x7FB5001B5DDE
#2  0x7FB4FF4C4D3F
#3  0x7FB4F3391D40
#4  0x7FB4F33666C3
#5  0x7FB4F3364C80
#6  0x7FB4F33759EF
#7  0x7FB4F345CA1F
#8  0x7FB4F345CD2F
#9  0x7FB500B7DBCC
#10  0x7FB500B7094F
#11  0x7FB500B7CC56
#12  0x7FB500B81410
#13  0x7FB500B7507B
#14  0x7FB500B6179D
#15  0x7FB500B940A0
#16  0x7FB5009BA047
#17  0x8A4EA3 in phiGemmInit
#18  0x76F55E in initcudaenv_
#19  0x66AE90 in __mp_MOD_mp_start at mp.f90:184
#20  0x66E192 in __mp_world_MOD_mp_world_start at mp_world.f90:58
#21  0x66DCC0 in __mp_global_MOD_mp_startup at mp_global.f90:65
#22  0x4082A0 in pwscf at pwscf.f90:23
#23  0x7FB4FF4AFEC4
Segmentation fault

Kindly help me out in solving the problem. My GPU details are

+------------------------------------------------------+
| NVIDIA-SMI 346.46     Driver Version: 346.46         |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr.
ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute
M. |
|===============================+======================+======================|
|   0  Tesla C2050         Off  | 0000:02:00.0      On |                  
 0 |
| 30%   62C   P12    N/A /  N/A |     87MiB /  2687MiB |      0%     
Default |
+-------------------------------+----------------------+----------------------+
|   1  Tesla K20c          Off  | 0000:83:00.0     Off |                  
 0 |
| 42%   55C    P0    46W / 225W |   4578MiB /  4799MiB |      0%     
Default |
+-------------------------------+----------------------+----------------------+
|   2  Tesla K20c          Off  | 0000:84:00.0     Off |                  
 0 |
| 34%   46C    P8    17W / 225W |     14MiB /  4799MiB |      0%     
Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU
Memory |
|  GPU       PID  Type  Process name                               Usage  
   |
|=============================================================================|
|    1     27680    C   ./pw-gpu.x                                   
4563MiB |
+-----------------------------------------------------------------------------+