spmd code in the script

I'm starting with spmd. My first prepared code runs by pasting into command window, but crashes Matlab when I run the script with the same content. Now I'm trying on the PC with probably only one physical worker (the collegue says that second is virtual) and it shows problems with running paralel pool (eg. Undefined function or variable 'matlab.internal.getSettingsRoot'.) . However the toolbox is installed and the pasted code runs ok and creates the composites properly.

[Edric Ellis]

What release of MATLAB are you using? Do you have a minimal reproduction script that demonstrates the problem? (Scripts containing spmd blocks should work just fine, so this may well turn out to be an installation problem somewhere...)

[Brendan Hamm]

Additionally you should actually expect a performance decrease if you have only one physical worker as virtual cores are sharing resources with the physical.

[Wojciech]

thank you, there was a problem with using the path together with the function name

Answer 1

[Shruti Sapre]

Hello,

The error you mentioned (Undefined function or variable 'matlab.internal.getSettingsRoot') occurs sometimes when a custom pathdef.m has been implemented or when the path used by MATLAB cannot find some basic MATLAB folders. You could try running the below commands and restarting MATLAB to remove any modifications made to your path.

>>restoredefaultpath;

>>rehash toolboxcache;

>>savepath;

Please note that this will remove any modifications you have made to your path; it will also remove third party toolboxes and support packages. (You will need to reinstall them)

Hope this helps!

-Shruti

[Wojciech]

thank you - the problem was with path as you wrote :)