How to increase maximum number of open files for code generation

Dear

How to increase maximum number of open files for code generation.

It looks like there is fix number for maximum number of open files = 20.

If you open more then 20 files, you will recieve error "For code generation, maximum number of open files is 20."

it looks that this limit is setup in autogenerated file fileManager.c

Could you let me know how I can setup coder to allow e.g. 25 files?

Thanks

Milos

Answer 1

[Prateek]

Hello Milos,

MATLAB places a limit of up to 20 open files in order to conserve static memory allocation.

It would be ideal to limit the number of files open simultaneously to 20. There is no limit to the number of files you can write, only to the number of files you can open at the same time.

This limit can be changed, but at your own risk. To do so, follow these instructions:

1. Change MATLAB directory to /matlab/%release%/toolbox/eml/lib/matlab/iofun/private/
2. Open “fileManager.m”
3. Locate the function “MAXFILES” (In MATLAB R2022a, go to line 325). This function contains the following code:

    n = coder.const(FIDCLS(20)); 

4. Edit this to the number you need. It can be up to 125.

5. Save this file and restart MATLAB.

Please note that this change needs to be re-implemented after every MATLAB update.

Hope this helps.

Regards,

Prateek

[Milos Sotak]

Thank you very much for your ANSWER.

Milos

[Milos Sotak]

Hi Prateek,

How it works in 2023a?

There is no file “fileManager.m” in directory /matlab/%release%/toolbox/eml/lib/matlab/iofun/private/

Regards,

Milos