Matlab为什么启动特别慢?

时间:2008-02-15 20:08:26  来源:本站搜集整理  作者:Eric
今天在公司的机子上装了个Matlab,安装时没问题,但启动时特别慢,估计有好几分钟才起来。而且界面出来之后,状态栏显示“Initializing...”很长时间。
网上搜了一下,找到了关于启动慢的原因:

Subject:
Why does MATLAB get stuck in the 'Initializing' state or take a long time to start on a Windows machine?

Problem Description:
MATLAB opens but the status states 'Initializing' for a long time. MATLAB takes a long time to launch with or without a remote license manager.

Solution:
==============
Licensing issues:
==============

If MATLAB starts, but remains in the "Initializing" state, MATLAB may be unable to find the licenses on your system. This may be caused by an improperly set environment variable named LM_LICENSE_FILE. This variable tells MATLAB and other flexlm applications where to find the license file. If this variable is set improperly, MATLAB may search for a license for extended periods of time. Also if you become disconnected from the network and you access a network license for toolboxes, MATLAB will hang if this variable is not set correctly.

This slow startup can also happen if you have a standalone license for MATLAB, but have the LM_LICENSE_FILE variable set for a different FLEXlm application.

NOTE: There may also be an MLM_LICENSE_FILE variable. This variable works only for MATLAB, but MATLAB will still read LM_LICENSE_FILE if it is set before it reads MLM_LICENSE_FILE. If you have an MLM_LICENSE_FILE variable, you may get better performance by switching to LM_LICENSE_FILE

In either case, to fix this problem please do the following:

1) Right-click on the "My Computer" icon and go to "Properties". (You may also do this by going to the Control Panel and double clicking "System."

2) Go to the "Advanced" tab and click on "Environment Variables"

3) Under the bottom window, System variables, look for a variable named LM_LICENSE_FILE

4) If there is an LM_LICENSE_FILE variable already set, skip to step 5. If there is not, create an LM_LICENSE_FILE variable by clicking "New" and typing "LM_LICENSE_FILE" in the Variable name box.

5) Set the LM_LICENSE_FILE variable to the absolute path of the MATLAB license.dat file for your standalone license first. The license file should be in the $MATLAB/bin/win32 directory, where $MATLAB is the root MATLAB directory. If there is more than one license file, put a semi-colon (;) after the first path, then type the path to the next license file. Click "OK" to save.

6) Launch MATLAB again.

Option 2
========

Alternatively, if you use only one license to access MATLAB and toolboxes, you can specify the license file in the MATLAB shortcut. To do so, follow these steps:

1) Right-click on a shortcut to MATLAB and select "Properties"

2) In the "Target" field, enter the following:


"$MATLABROOT\bin\win32\MATLAB.exe" -c "$MATLABROOT\bin\win32\license.dat"


(where $MATLABROOT is the root MATLAB directory)

3) Click "OK".

4) Launch MATLAB from the shortcut.

=================
Non-licensing issues:
=================
(Make sure you have enabled viewing of hidden files and folders first)
1. Browse to the folder c:\Documents and Settings\ <your username>\Application Data\

2. Remove the directory named "MathWorks"

3. Once this has been removed, restart MATLAB. This directory will be recreated the next time you start MATLAB.

If that does not resolve the issue, there is a known issue with MATLAB 7.0 (R14) and the graphics libraries supplied with certain graphics cards, which do not use memory efficiently, and cause MATLAB 7.0 (R14) to use virtual memory more frequently than would be expected. In this case, disabling the hardware graphics acceleration features of the card may improve the performance of MATLAB 7.0 (R14). To do so, follow the steps below.

1) Close MATLAB.

2) Right-click on the Windows desktop, and select "Properties".

3) In the Display Properties window that opens, select the "Settings" tab, and then click on the "Advanced" button.

4) In the window which opens, select the "Troubleshoot" tab.

5) Set the "Hardware acceleration" slider all the way to the left, to "None".

6) Click "OK" in this window, and then click OK again in the Display Properties window.

7) Restart MATLAB.

Solution 2:
============

In some instances, customers have reported that the anti-virus application on their machine, which was working in the background, was slowing down MATLAB. For these customers, disabling the active scan option for at least the MATLAB directories improved performance substantially.



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