Why do I receive the error "Invalid maximum heap size: -Xmx%WORKE​R_MAXIMUM_​MEMORY%" in my MDCE log file?

Why do I receive the following error in my MDCE log file?

Invalid maximum heap size: -Xmx%WORKER_MAXIMUM_MEMORY%

Answer 1

[MathWorks Support Team]

The MDCE log file is found in the location below:

Windows:

C:\TEMP\MDCE\log\mdce-service.log

Mac/Linux:

/var/log/mdce/mdce-service.log

You will get this error due to using an older version of the mjs_def file where it does not contain either one or more of the maximum memory lines. These lines tell the mdce process to send a particular amount of memory through to the JVM.

Your mjs_def file is located here:

$MATLABROOT\toolbox\parallel\bin\mjs_def

Where $MATLABROOT is the installation directory of MATLAB.

*To resolve this issue, make sure that the following lines are inside of your mjs_def <file:*>

# WORKER_MAXIMUM_MEMORY: The maximum heap size of the all worker java
# process.
WORKER_MAXIMUM_MEMORY="1024m"

and

# JOB_MANAGER_MAXIMUM_MEMORY: The maximum heap size of the job manager java
# process.
JOB_MANAGER_MAXIMUM_MEMORY="1024m"

After changing this file, make sure you restart your mdce processes to start using this change.

• NOTE: Starting in R2019a the following name changes occurred:
• MATLAB Distributed Computing Server was renamed to MATLAB Parallel Server
• mdce_def was renamed to mjs_def
• mdce binary was renamed to mjs
• mjs_def.bat file is in $MATLAB/R20XXx/toolbox/distcomp/bin for R2019a and earlier.