MATLAB: Does the “Mem Usage” (in Windows Task Manager) drop significantly, while the “VM Size” remains relatively unchanged, when I minimize all MATLAB related windows

MATLAB

In MATLAB 7.3 (R2006b), when I minimize all MATLAB related windows, the "Mem Usage" (under the Processes tab in Windows Task Manager) drops significantly from about 160 Mb to 6 Mb. However, the "VM Size" remains relatively stable at about 170 Mb.

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The “Mem Usage” refers to the "working set" of a process, the amount of memory it is actively using right now, which is related to the physical memory currently used. However, the “VM Size” refers to the process' less frequently used memory that has been paged to disk (i.e. page file or swap file).

When MATLAB and its related windows are minimized, the active memory that was related to the user interface is cleared, while the information on the virtual memory portion is retained.

More information about Windows Task Manager is available on Microsoft® TechNet at the following link:

https://technet.microsoft.com/en-us/library/cc958260.aspx

Related Solutions

MATLAB: Does MEMORY command indicate an increase in memory usage on executing a script though I do not have any variable in the workspace in MATLAB R2014b

The MEMORY function returns the amount of RAM memory that the operating system thinks that MATLAB is using. However, the actual memory usage in MATLAB may be different. What this means is that the additional memory, which is 35 GB int this case is probably still available for use by creating arrays in MATLAB.

In order to confirm this, after running your memory consuming code, please try to allocate random array as shown below.

>> a=rand(100000,10000);

Please check if the above command causes an increase in memory used by MATLAB using the MATLAB command. It is expected that you will not see an increase in the memory usage.

MATLAB: How to create custom code suggestions for class functions in MATLAB live scripts

It is possible to use code suggestions with ordinary class member functions.

The only difference is you must account for the first method argument being a reference to the class.

The first argument passed to a MATLAB class member function is a reference to the object. In that sense, the following two function calls are equivalent:

classObj.func(val)
func(classObj, val)

For more information on this, please see:

https://www.mathworks.com/help/matlab/matlab_oop/specifying-methods-and-functions.html

When creating the 'functionsSignatures.json', be sure to include an input for the class object.

Here is an example 'functionsSignature.json' snippet for a class which has static and ordinary member functions:

{
      "BasicClass.BasicClass":
      {
          "inputs":
          [
              {"name":"inputVal", "kind":"required", "type":["numeric"], "purpose":"Constructor with value to initalize with."}
          ]
      },
      "BasicClass.printString":
      {
          "inputs":
          [
              {"name":"inputString", "kind":"required", "type":["string"], "purpose":"String to print to screen."}
          ]
      },
      "BasicClass.multBy":
      {
          "inputs":
          [
              {"name":"obj", "kind":"required", "type":["BasicClass"], "purpose":"BasicClass object to run function on."},
              {"name":"multVal", "kind":"required", "type":["numeric"], "purpose":"Will multiply the initial value by multVal."}
          ]
      }
  }

In the example, "printString" is static, while "multBy" is a traditional member function.

Moreover, once you have written the JSON file, you can also verify it by executing the following command in the MATLAB Command Window:

>> validateFunctionSignaturesJSON

You will find more information about this function in the documentation:

https://www.mathworks.com/help/matlab/ref/validatefunctionsignaturesjson.html

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Related Solutions

MATLAB: Does MEMORY command indicate an increase in memory usage on executing a script though I do not have any variable in the workspace in MATLAB R2014b

MATLAB: How to create custom code suggestions for class functions in MATLAB live scripts

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