Running Matlab in Linux using nodesktop or nojvm

Hi . I always used to start matlab on my linux server with -nodesktop version . Or few years ago with -nojvm . I do not use any X servers features just math computations. I see lately after some library updates on the Linux box the following error messages at start

MATLAB is selecting SOFTWARE OPENGL rendering.

Opening log file: /home/mm/java.log.37058

Insufficient space for shared memory file:

4034754

Try using the -Djava.io.tmpdir= option to select an alternate temp location.

When reading the log in that location I see

Operating System: Linux 5.16.16-1.el8.elrepo.x86_64 #1 SMP PREEMPT Fri Mar 18 09:50:20 EDT 2022 x86_64

Processor ID: x86 Family 143 Model 49 Stepping 0, AuthenticAMD

Host Name: up-ph4

Java HotSpot(TM) 64-Bit Server VM warning:

[Alex Pedcenko]

It looks like you have not enough space in your home folder

may be you can set explicitly where to store the java log file as it suggests, e.g.

How can I change the temp directory the Update installer uses? - (mathworks.com)

[Alex Pedcenko]

Also -nojvm can still be used together with -nodesktop. -nodesktop alone does not disable JVM.

[Mihai Milea]

Yes that worked , thank you very much . I do not use Java at all . So -nodesktop -nojvm solved the issue .

Answer 1

[Walter Roberson]

There are several ways to implement shared memory between processes.

One of the major ways is to allocate physical memory (RAM) aligned on a physical page, and use the virtual address hardware to map the same physical memory into the logical address space of multiple processes. The memory is transient and limited to the size of physical memory.

One of the other ways is to create a file that has multiple access. The file can remain on disk and is not limited to physical memory.

Java appears to be using disk-backed shared memory. But that runs into problems if the disk gets full.

You should check for your disk being full and free up some disk space.