Extremely long delay when opening a Simulink model with UDP block (Instrument Control Toolbox)

Hi all,

I have the following problem: When I try to open a Simulink model with an UDP receive or send block (from the Instrument Control Toolbox) for the first time after starting Simulink, I have to wait over 30 minutes until the program show ready. After this first launch, I can work with the model without any problems. The problem still persists after reinstalling Matlab and Simulink. During the startup time, I can see in the task manager that Matlab is using 35 % of the CPU power. There are two processes from type "Java Chromium Embedded Framework (JCEF) Helper" and two from type "Matlab 2020a". I think it is a problem with the "Instrumental Control Toolbox" because I only have this problem when I use blocks from it.

Does someone else also have this problem and how can it be solved?

-----------------------------------------------------------------------------------------------------

MATLAB Version: 9.8.0.1323502 (R2020a)

Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 18362)

Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

-----------------------------------------------------------------------------------------------------

Instrument Control Toolbox Version 4.2 (R2020a)

[VIJAY KUMAR DUBEY]

I have got the same problem after simulation. Since matlab 2020 requires more than 8GB of RAM, the problem must be associated with the RAM. I hope after increasing the RAM of your system, the problem will automatically dissolved

Answer 1

[sven lack]

Hello and thanks for the answers but they don't solve my problem. I am now using Matlab 2020b on a computer with 16 GB of RAM, I7-7500U CPU and still the same problem. A simple model with just a UDP receive block takes 3 minutes to load (when I open it for the first time, if I close the model and open it again, it takes half as long). Java is up to date and I don't have prescan installed.

So, I think the best solution to the problem is to use udp blocks from other libraries (e.g. DSP toolbox). The same Model with a UDP receive block from the DSP toolbox takes less than a second to load on my system.

Answer 2

[Jiajun Ma]

Hi Sven.

I have encoutered the same issue.

After updating my Java to latested version and reboot my computer.

The problem is solved.

[Jiajun Ma]

Update this answer

The reason for my issue was Prescan.

If you have Prescan installed. Please take a look at your env variables.

[Shimon Elkin]

Hi @Jiajun Ma, can you elaborate on the Prescan?

Answer 3

[Longfrei Bai]

I have the same issue with 2021b...

[Marta Tjoa]

I also have the same issue with R2021b.

Answer 4

[cui]

R2022a have the same issue...

automated driving toolbox: driving scenaro app