RAM_FREE get free physical RAM

What "free" memory means has many definitions across computing platforms. The user must consider total memory and monitor swap usage.

get free physical RAM across operating systems https://docs.oracle.com/en/java/javase/21/docs/api/jdk.management/com/sun/management/OperatingSystemMXBean.html#getFreeMemorySize()

Contents

Inputs

Outputs

function [i, b] = ram_free(backend)
if nargin < 1
  backend = ["java", "python", "sys"];
else
  backend = string(backend);
end

i = uint64.empty;

for b = backend
  switch b
    case 'java'
      i = stdlib.java.ram_free();
    case 'python'
      if stdlib.matlabOlderThan('R2022a'), continue, end
      i = stdlib.python.ram_free();
    case 'sys'
      i = stdlib.sys.ram_free();
    otherwise
      error("stdlib:ram_free:ValueError", "Unknown backend: %s", b)
  end

  if ~isempty(i)
    return
  end
end

% * VisualBasic (needs Windows) is needed to do this with .NET.
% * builtin memory() on Windows includes swap. The user could do that themselves.

end

Published with MATLAB® R2025a