[CIG-SEISMO] Porblems about the GPU in SPECFEM3D learning

[Xin Wang]

Dear sir / madam,

i am Xin Wang, a PhD student in Laurentian University. i am currently trying 
to run the SPECFEM2D/3D packages to simulate the seismic wave propagation in 
underground mine enviroment. i met several problems in the learning of this 
software.

1) i wanna mode the opennings in underground, there is some errors when i 
assign the material parameters to the openings, et., Vp=Vair, Vs=0. Can you 
please give me a sloution how to determine the parameters for the tunnels 
zone?

2) is there a size limitation for the model? becasue all the examples in the 
source code are very large to simulate the earth quake wave propagation. but 
what i wanna do is to perform relative small scale range in a underground 
mine, so can you tell me the proper ways to relize it? i think this code 
will very useful in the dynamic modeling in underground mining.

3) Can you tell me how to turn on the GPU model? i just add a command line 
in the Par_file as the manuls suggested, but i seems that the elapse time 
does not change. so can you offer me a way to turn on and monitor the 
working of GPU? by the way, the version of of SPECFEM3D is V2.0.2( i wonder 
if this is the version's issue?). the configuration of the workstation is:
       the workstation in our lab has two GPUs of Quadro K5000 and Tesla 
K20c.The Quadro K5000 and the Tesla k20c have 4G of memory, and with bus 
type of PCI Express x16 Gen2.  Regarding to the CPUs, it have 16 processors 
(Intel (R) Xeon(R) CPU E5-2687w) operating at 3.10 GHz, and It runs 
Linux-X86-64 and has 32 GB of RAM.

Would you please help me to overcome these problem? Thanks for the helping.
All the best!

Cheers
xin