.. _pylab_examples-system_monitor:

pylab_examples example code: system_monitor.py
==============================================

[`source code <system_monitor.py>`_]

::

    #!/usr/bin/env python
    # -*- noplot -*-
    import time
    from pylab import *
    
    def get_memory():
        "Simulate a function that returns system memory"
        return 100*(0.5+0.5*sin(0.5*pi*time.time()))
    
    def get_cpu():
        "Simulate a function that returns cpu usage"
        return 100*(0.5+0.5*sin(0.2*pi*(time.time()-0.25)))
    
    def get_net():
        "Simulate a function that returns network bandwidth"
        return 100*(0.5+0.5*sin(0.7*pi*(time.time()-0.1)))
    
    def get_stats():
        return get_memory(), get_cpu(), get_net()
    
    # turn interactive mode on for dynamic updates.  If you aren't in
    # interactive mode, you'll need to use a GUI event handler/timer.
    ion()
    
    fig = figure(1)
    ax = subplot(111)
    ind = arange(1,4)
    pm, pc, pn = bar(ind, get_stats())
    centers = ind + 0.5*pm.get_width()
    pm.set_facecolor('r')
    pc.set_facecolor('g')
    pn.set_facecolor('b')
    ax.set_xlim([0.5,4])
    ax.set_xticks(centers)
    ax.set_ylim([0,100])
    ax.set_xticklabels(['Memory', 'CPU', 'Bandwidth'])
    ax.set_ylabel('Percent usage')
    ax.set_title('System Monitor')
    
    for i in range(200):  # run for a little while
        m,c,n = get_stats()
    
        pm.set_height(m)
        pc.set_height(c)
        pn.set_height(n)
        ax.set_ylim([0,100])
    
        draw()
    
    
    
    
    
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)