Potential bug in the multi-core processing by utilizing "parallel computing" toolbox

Question

Woo-Jae Cheong 2018-7-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412435-potential-bug-in-the-multi-core-processing-by-utilizing-parallel-computing-toolbox

编辑： OCDER 2018-7-27

I am trying to speed up my simple data-extraction Matlab (R2011b) script that includes a simple loop structure. I managed to get it working with the loop structure that allows the 'multi-core' processing:

Loop starts

create a 'data' filename
open the 'data' file
open the 'output' file
extract the line with the selected phrase until the end of the 'data' file
close the 'data' file
close the 'output' file

Loop ends

However, the output files of the duo- and quad-cores processing resulted in random omissions of the extracted lines compared to those in the output file of the single-core processing.

No# Core/Total Lines Extracted/% Line Omission

1 Core/72000/0

2 Cores/71899/0.14

4 Cores/71222/1.08

Considering the facts that (1) the 1-core processing produced the anticipated results and (2) the Matlab script is simple and short, I believe that this is the software bug in the Matlab 'parallel computing toolbox'. I am wondering whether anyone else observed the similar issues or whether it has already been acknowledged as a software bug and has already been fixed with some sort of patch.

Thank you in advance.