Slow Java initialization during startup

Question

Tyler 2023-5-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1956139-slow-java-initialization-during-startup

评论： Tyler 2023-5-24

I have Matlab R2023a installed on an up-to-date Arch Linux system. Installation didn't have any issues but it takes several minutes for Matlab to start. The splash screen appears right away but then it is stuck there for several minutes before the main interface appears.

Staring with the -timing flag points to PostVMInit and InitDesktop, whatever those are.

MATLAB Startup Performance Metrics (In Seconds)
total   item     gap      description
=========================================================
18   0.18    0.00   MATLAB script                           
25   0.07   -0.00   main                                    
27   0.02    0.00   Session Initialize                      
74   0.00    0.47     Toolbox cache load Start              
74   0.18    0.29   Session Initialize                      
90   0.04    0.87   LM Startup                              
92   0.18    0.74   cachepath                               
93   0.02    0.00   splash                                  
13   0.12    0.08     Constant Initialization               
15   0.23    0.00   Engine Startup                          
22   0.07    0.00      InitSunVM                            
13  240.89    0.03      PostVMInit                           
13  240.98    0.00     mljInit                               
39   0.26    0.00     StartDesktop                          
39  241.24    0.00   Java initialization                     
39   0.00    0.00   psParser                                
42   0.00    0.03   Toolbox cache join                      
68   0.17    0.08   matlabpath                              
88   0.05    0.16   matlabrc                                
68  121.29   242.39     Init Desktop                          
74  121.35   242.39   Ready                                   
=========================================================
Items shown account for 100.0% of total startup time

Running bare with matlab -nojvm starts quickly.

< M A T L A B (R) >
Copyright 1984-2023 The MathWorks, Inc.
R2023a Update 1 (9.14.0.2239454) 64-bit (glnxa64)
March 30, 2023
Warning: X does not support locale en_US.UTF-8
For online documentation, see https://www.mathworks.com/support
For product information, visit www.mathworks.com.
>>     MATLAB Startup Performance Metrics (In Seconds)
total   item     gap      description
=========================================================
0.20   0.20    0.00   MATLAB script
0.26   0.07    0.00   main
0.28   0.01    0.00   Session Initialize
0.69   0.00    0.41     Toolbox cache load Start
0.69   0.14    0.27   Session Initialize
0.85   0.04    0.81   LM Startup
0.85   0.00    0.00   splash
0.85   0.16    0.69   cachepath
1.02   0.10    0.08     Constant Initialization
1.04   0.20    0.00   Engine Startup
1.04   0.00    0.00   Java initialization
1.05   0.00    0.00   psParser
1.07   0.00    0.02   Toolbox cache join
1.26   0.15    0.04   matlabpath
1.41   0.03    0.12   matlabrc
=========================================================
Items shown account for 70.6% of total startup time

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Answer 1

Vinayak 2023-5-22

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1956139-slow-java-initialization-during-startup#answer_1241524

在 MATLAB Online 中打开

A few methods that could be implemented to curb this would be

Increasing Java Memory heap space, You can increase the Java heap space by editing the "javaclasspath.txt" file in the MATLAB preferences directory. This file is used to configure the Java classpath and other Java related settings. You can add the following line to set the Java heap size:

-Xmx2048M

Holy Trinity, Holy trinity refers to a series of steps taken to rehash the toolbox and matlab paths

rehash
rehash toolbox
rehash toolboxcache

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Tyler 2023-5-22

在 MATLAB Online 中打开

The file javaclasspath.txt didn't exist so I created it at ~/.matlab/R2023a/ and added the line you gave me.

It no longer gets stuck at Init Desktop but PostVMInit is stil slow. After the main gui appears, it also takes another two minutes of Initializing... which didn't happen before. So I'm still waiting about the same amount of time before the software is usable.

total   item     gap      description
=========================================================
17   0.17    0.00   MATLAB script
24   0.07    0.00   main
25   0.01    0.00   Session Initialize
66   0.00    0.41     Toolbox cache load Start
66   0.15    0.26   Session Initialize
78   0.12    0.66   cachepath
82   0.03    0.79   LM Startup
83   0.01    0.00   splash
99   0.10    0.06     Constant Initialization
01   0.18    0.00   Engine Startup
07   0.06    0.00      InitSunVM
75  120.66    0.02      PostVMInit
75  120.74    0.00     mljInit
96   0.21    0.00     StartDesktop
96  120.95    0.00   Java initialization
96   0.00    0.00   psParser
99   0.00    0.02   Toolbox cache join
26   0.21    0.07   matlabpath
46   0.04    0.15   matlabrc
41   1.45   121.96     Init Desktop
47   1.51   121.96   Ready
=========================================================
Items shown account for 100.0% of total startup time

FYI, I see the following errors reported at the end of Initializing... Not sure if that is relevant.

com.jogamp.opengl.GLException: X11GLXDrawableFactory - Could not initialize shared resources for X11GraphicsDevice[type .x11, connection :0, unitID 0, handle 0x0, owner false, ResourceToolkitLock[obj 0x4338e6d3, isOwner false, <1cc85f20, 79a04148>[count 0, qsz 0, owner <NULL>]]]
	at jogamp.opengl.x11.glx.X11GLXDrawableFactory$SharedResourceImplementation.createSharedResource(X11GLXDrawableFactory.java:326)
	at jogamp.opengl.SharedResourceRunner.run(SharedResourceRunner.java:297)
	at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.NullPointerException
	at jogamp.opengl.GLContextImpl.makeCurrent(GLContextImpl.java:688)
	at jogamp.opengl.GLContextImpl.makeCurrent(GLContextImpl.java:580)
	at jogamp.opengl.x11.glx.X11GLXDrawableFactory$SharedResourceImplementation.createSharedResource(X11GLXDrawableFactory.java:297)
	... 2 more

Vinayak 2023-5-23

Hi Tyler,

You could try removing some toolboxes or addons you dont use frequently via the add on manager and check to see if it improves the startup time.
There is a possibility that you have some custom startup files in 'startup.m'. You can try to run matlab without these to see if it improves startup time. This can be done by using -nosplash -nojvm -nodesktop -nodisplay' flags in the command line while starting MATLAB.
Increasing the JVM Memory, I had already mentioned this in the last comment and you had also ascertained that you ran the command that I provided. Just to be sure you could go to the "Advanced" tab in the "Preferences" dialog box and click on "Java Heap Memory". and confirm the "Initial Heap Size" and "Maximum Heap Size" fields.
If nothing works, maybe upgrading to the latest version or a last resort could be to reinstall MATLAB.

Thanks,

Vinayak

Tyler 2023-5-24