%Copyright (c) 2012, Michael Hirsch
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%Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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% Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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function [memStats] = linMem()
if ~isunix
memStats.error = true;
return
end

[sts,msg] = unix('free -m | grep Mem:');

if sts %error
memStats.error = true;
return
else %no error
mems = cell2mat(textscan(msg,'%*s %u %u %u %*u %*u %*u','delimiter',' ','collectoutput',true,'multipleDelimsAsOne',true));
memStats.freeMB = mems(3);
memStats.usedMB = mems(2);
memStats.totalMB = mems(1);
memStats.error = false;
end

tmp= java.lang.Runtime.getRuntime.maxMemory;
disp( [ 'Max available memory:' num2str(tmp /1024^2 , '%3.5f\n') 'MB' ] );
tmp= java.lang.Runtime.getRuntime.totalMemory;
disp( ['Already Used:' num2str(tmp/1024^2 , '%3.5f\n') 'MB' ] );

end %function

matlab double 8B
a=zeros(1024,1024,1024);
8192MB.
不要看mat文件，这个有压缩
用whos查看， *8/1024/1024为所占用MB