Unkown error running mcxlab in mcx_core.cu

[bradday4]

MCX studio is running perfect on my machine in the lab with a GeForce GTX 745 Cuda enabled graphics card. However, when I attempt to run any example MATLAB script with MCX I receive the following error message:

MCXLAB ERROR -30 in unit mcx_core.cu:1756: unknown error
Error from thread (0): unknown error
C++ Error: MCXLAB Terminated due to an exception!

I'm using the the 10/01/18 nightly build version of MCX.

Thanks

[fangq]

try the below two things:

1. type gpuinfo=mcxlab('gpuinfo') and see what matlab outputs
2. modify the demos script, and reduce your phone number by setting cfg.nphoton to a small number, say 1e3, or 1e4 (or insert cfg.nphoton=1e4 before the mcxlab call), and see if you are getting the same error.

it is likely your driver is not set up or you did not apply the registry fix on a windows host.

http://mcx.space/wiki/index.cgi?Doc/FAQ#I_am_getting_a_kernel_launch_timed_out_error_what_is_that

Update: cross-out the above possibility since mcx does work on your card.

[bradday4]

I tried both suggestions,

1. gpuinfo seems to work fine (see attached output from command).
2. I modified a demo script with cfg.nphoton=1e4 and received the same error.

I applied the registry fix 'apply_timeout_registry_fix.bat' as administrator and restarted the computer when I initially installed mcx.
gpuinfo.txt

[fangq]

Ok, I think this might be due to missing some dlls. Can you Google "dependency walker" and load mcx.mexw64 to see if any dll missing?

[Eidantz]

I have a similar problem:
MCXLAB ERROR -4 in unit mcx_core.cu:1756: unspecified launch failure
Error from thread (0): unspecified launch failure
C++ Error: MCXLAB Terminated due to an exception!
1.gpuinfo seems to work fine
2. I modified a demo script with cfg.nphoton=1e4 and did not receive any error but if I change it back to 1e7 the error appear again and even if I change the cfg.nphoton=1e4 after the error it won't work again.

I am using Nvidia Geforce 930MX I updated my driver with no help.
Any suggestion?

[fangq]

You need to apply the registry fix, see the FAQ link in my reply 3 days ago.

[fangq]

@bradday4, did not hear from you, if this issue has been fixed with the registry fix, I will close it. please let me know.