How to plot the CPU usage of Matlab - matlab

Question

i have a code that displays the CPU usage of Matlab, my problem is how to PLOT the CPU usage over time because the this code does NOT save any variables in the workspace,I need a method for storing the CPU usage in an array when the code is run so that i can plot it
Thanks for your time.
here is the code:
function hcol = CPU_monitor
h = create_gui;
end
function mon = createMonitor
MatlabProcess = System.Diagnostics.Process.GetCurrentProcess(); %// "Matlab" process
cpuIdleProcess = 'Idle';
mon.NumOfCPU = double(System.Environment.ProcessorCount);
mon.ProcPerfCounter.Matlab = System.Diagnostics.PerformanceCounter('Process', '% Processor Time', MatlabProcess.ProcessName);
mon.ProcPerfCounter.cpuIdle = System.Diagnostics.PerformanceCounter('Process', '% Processor Time', cpuIdleProcess);
end
function updateMeasure(obj,evt,hfig)
h = guidata(hfig);
%// Calculate the cpu usage
cpu.total = 100 - h.mon.ProcPerfCounter.cpuIdle.NextValue / h.mon.NumOfCPU;
cpu.matlab = h.mon.ProcPerfCounter.Matlab.NextValue / h.mon.NumOfCPU;
%// update the display
set(h.txtTotalCPU,'String',num2str(cpu.total,'%5.2f %%'))
set(h.txtMatlabCPU,'String',num2str(cpu.matlab,'%5.2f %%'))
end
function StartMonitor(obj,evt)
h = guidata(obj);
start(h.t)
end
function StopMonitor(obj,evt)
h = guidata(obj);
stop(h.t)
end
function h = create_gui %// The boring part
h.fig = figure('Unit','Pixels','Position',[200 800 240 120],'MenuBar','none','Name','CPU usage %','NumberTitle','off');
h.btnStart = uicontrol('Callback',#StartMonitor,'Position',[10 80 100 30],'String', 'START');
h.btnStart = uicontrol('Callback',#StopMonitor,'Position',[130 80 100 30 ],'String', 'STOP');
h.lbl1 = uicontrol('HorizontalAlignment','right','Position',[10 50 100 20],'String','TOTAL :','Style','text');
h.txtTotalCPU = uicontrol('Position',[130 50 100 20],'String','0','Style','text');
h.lbl2 = uicontrol('HorizontalAlignment','right','Position',[10 10 100 20],'String','Matlab :','Style','text');
h.txtMatlabCPU = uicontrol('Position',[130 10 100 20],'String','0','Style','text');
movegui(h.fig,'center')
%// create the monitor
h.mon = createMonitor;
%// Create the timer
h.t = timer;
h.t.Period = 0.25;
h.t.ExecutionMode = 'fixedRate';
h.t.TimerFcn = {#updateMeasure,h.fig};
h.t.TasksToExecute = Inf;
%// store the handle collection
guidata(h.fig,h)
end

Answer 1

one way is to save the variables to a file and read and plot it after you stop. So you add a dlmwrite command in the updateMeasure function, a tic to start the timer in StartMonitor, and dlmread and plot in StopMonitor. Of course this is quick and dirty as the file created will be needed to be deleted or checked so you wont continue to append to it in the later uses.
This is everything
function hcol = CPU_monitor
h = create_gui;
end
function mon = createMonitor
MatlabProcess = System.Diagnostics.Process.GetCurrentProcess(); %// "Matlab" process
cpuIdleProcess = 'Idle';
mon.NumOfCPU = double(System.Environment.ProcessorCount);
mon.ProcPerfCounter.Matlab = System.Diagnostics.PerformanceCounter('Process', '% Processor Time', MatlabProcess.ProcessName);
mon.ProcPerfCounter.cpuIdle = System.Diagnostics.PerformanceCounter('Process', '% Processor Time', cpuIdleProcess);
end
function updateMeasure(obj,evt,hfig)
h = guidata(hfig);
%// Calculate the cpu usage
cpu.total = 100 - h.mon.ProcPerfCounter.cpuIdle.NextValue / h.mon.NumOfCPU;
cpu.matlab = h.mon.ProcPerfCounter.Matlab.NextValue / h.mon.NumOfCPU;
dlmwrite('cpulog.txt', [toc, cpu.total , cpu.matlab], '-append');
%// update the display
set(h.txtTotalCPU,'String',num2str(cpu.total,'%5.2f %%'))
set(h.txtMatlabCPU,'String',num2str(cpu.matlab,'%5.2f %%'))
end
function StartMonitor(obj,evt)
h = guidata(obj);
start(h.t)
tic
end
function StopMonitor(obj,evt)
h = guidata(obj);
stop(h.t)
data=dlmread('cpulog.txt');
data(1,:)=[];
figure;plot(data(:,1),data(:,2),data(:,1) ,data(:,3));
legend('total cpu','matlab cpu'); xlabel('sec'); ylabel('%');
end
function h = create_gui %// The boring part
h.fig = figure('Unit','Pixels','Position',[200 800 240 120],'MenuBar','none','Name','CPU usage %','NumberTitle','off');
h.btnStart = uicontrol('Callback',#StartMonitor,'Position',[10 80 100 30],'String', 'START');
h.btnStart = uicontrol('Callback',#StopMonitor,'Position',[130 80 100 30 ],'String', 'STOP');
h.lbl1 = uicontrol('HorizontalAlignment','right','Position',[10 50 100 20],'String','TOTAL :','Style','text');
h.txtTotalCPU = uicontrol('Position',[130 50 100 20],'String','0','Style','text');
h.lbl2 = uicontrol('HorizontalAlignment','right','Position',[10 10 100 20],'String','Matlab :','Style','text');
h.txtMatlabCPU = uicontrol('Position',[130 10 100 20],'String','0','Style','text');
movegui(h.fig,'center')
%// create the monitor
h.mon = createMonitor;
%// Create the timer
h.t = timer;
h.t.Period = 0.25;
h.t.ExecutionMode = 'fixedRate';
h.t.TimerFcn = {#updateMeasure,h.fig};
h.t.TasksToExecute = Inf;
%// store the handle collection
guidata(h.fig,h)
end