I am running simulations which are computationally intensive. However, when I run one particular case, I receive an error message saying:
Cache Memory is ExhaustedMy data is not memory intensive so this cannot be an 'Out of Memory' issue.
MATLAB: Do I get a ‘Cache memory is Exhausted’ when I am working on some data sets in MATLAB 7.1 (R14SP3)
MATLAB
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In theory, 32-bit applications can address up to 4GB of virtual memory.
However, a number of things affect the actual memory accessibility:
1. The Operating System reserves memory for itself, reducing the amount of memory its applications can use.
2. Other applications running at the same time can eat up memory as well.
3. MATLAB reserves memory for itself. Even when there is no code running and there are no variables in the workspace, MATLAB is still using memory.
4. The memory available to MATLAB may be fragmented when starting additional tools or toolboxes, or loading MATLAB functions into memory. This limits the size of the largest contiguous block of memory. Since MATLAB matrices need to be stored in contiguous blocks, Out of Memory errors can occur while trying to create a matrix larger than the size of the largest contiguous block, even if that memory exists in several fragmented blocks.
There are tools for memory management for Macs:
The TOP command allows you to view the RPRVT (amount of memory in use) and VSIZE(amount of virtual memory paged so far) for the applications with top CPU usage:
topTo access more memory you can run MATLAB from xterm with –nojvm option:
matlab –nojvmwhich does not load Java Virtual Machine and thus saves memory MATLAB uses for itself otherwise.
For more on Memory Management, please refer to the following Tech Notes:
MATLAB uses a Microsoft feature called Change Notification Handles (CNHs) to track if a file has been updated in a directory which has been added to the MATLAB path or is the current directory. These CNHs are shared between all of the programs on a machine. When connecting to a server, Windows will use the lowest setting (either the client or the server) to determine how many CNHs may be created between the server and the client machine.
This warning message indicates that Windows has exhausted its supply of change notification handles. This could mean new files in this directory are not detected by MATLAB, or changes to existing files are not detected, if you are editing the files outside of MATLAB. There are four possible solutions to this issue:
1. The most robust solution is to prevent exhausting the supply of change notification handles by increasing the number of available CNHs on both the client and server side (by default the limit is 50). On Windows, CNHs are a type of Current Command. To increase the limit of Current Commands on both the client machine and the server, see this Microsoft knowledge base web page:
For Windows:
<https://docs.microsoft.com/en-us/windows-server/administration/performance-tuning/role/file-server/>
For more information about tuning these parameters:
To make this same change for a non-Microsoft server, consult the documentation and look for a setting that has the same effect as the MaxMpxCt setting which is described on the Microsoft knowledge base article. (For instance, Netapp uses cifs.max_mpx.)
Any modifications for the server to support more handles would be server-specific.
2. Keep your current Windows settings and reduce the number of CNHs you are using by removing extraneous user added paths from your MATLAB path. Each path that you remove will release a CNH back to the OS for use.
Note that the directories that are part of the MATLAB default path and exist under the MATLABROOT directory do not receive a CNH initially because it is assumed that the files in these directories are static. Making any directory your current directory will cause MATLAB to ask for a CNH for that directory.
3. Keep your current Windows settings and use the SYSTEM_DEPENDENT command to change how MATLAB interacts with CNHs. You may request that MATLAB not use CNHs, or you may suppress any warnings about CNHs. You can specify what policy MATLAB should use after CNH exhaustion using the commands
>> system_dependent('RemotePathPolicy', <policy>);>> system_dependent('RemoteCWDPolicy', <policy>);For more information about how MATLAB uses SYSTEM_DEPENDENT to change MATLAB's interactions with CNHs see the documentation linked below:
4. If for example, you are editing files outside of MATLAB, you can force MATLAB to detect changes to the file by executing any of the following within MATLAB:
>> clear functionname %functionname is the name of the function that changed
>> clear functions %clear all functions
>> clear all %also clears all variables
If these solutions do not help resolve the issue, please refer to your local IT department for assistance.
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