Segmentation Violation with Parallel Toolbox on

Hi everyone,

I am writing to ask you help with handling of Parallel Matlab Toolbox. I have created a main script that calls another one with a library of .m files that, in sequence, will be executed step-by-step (So that: Script1 -> Script2 -> .m files in sequence). Once finished, .m file passes calculated data to Script2 that calls next .m file and so on till end. If I try to execute the script without Parallel it works perfectly but if I want to speed up the process and include Parallel function spmd it returns an error of Segmentation Violation and forces Matlab closing. All the .m files that I wrote with spmd have in common that spmd function is above a for loop so that it could be split between my 2 CPU Cores and take less time. Strange thing (at least for me) is that if I run only the .m file, without being called from other 2 scripts, it works! Another thing that I have noticed is that when it crashes it doesn't activate parpool while, again, if I run .m file from its own it starts automatically parpool and finishes calculations. I have also tried to start parpool at the beginning of the main script but it crashes anyway.

My PC configuration is:

• Matlab 2014b
• Macbook Pro 2013 Retina
• CPU: Intel Core i5 Dual Core 2.5 Ghz 64bit
• OS: OS X 10.10.3 Yosemite
• Java Version: Version 8 Update 45 (1.8.0_45-b14)

Anyone has some ideas?

Thank you in advance!

Leo

* UPDATE *

After some trials I have discovered and cleared that main problem is when there is a Parallel process inside a script being called with "run" command. Anyone can suggest me how to handle it (without take "run" off)?

[Rob]

Run matlab and your script from the command line:

matlab -r name_of_your_script_without_extension -logfile name_of_logfile.out