How to Eat Memory using Python?

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无人及你
无人及你 2021-01-31 16:10

Just for experiment, and Fun... I am trying to create an app that can \"Purposely\" consume RAM as much as we specify immediately. e.g. I want to consume 512 MB RAM, then the ap

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  •  醉梦人生
    2021-01-31 16:53

    Here is a version of markolopa's answer that worked for me:

    import os
    import psutil
    
    PROCESS = psutil.Process(os.getpid())
    MEGA = 10 ** 6
    MEGA_STR = ' ' * MEGA
    
    
    def pmem():
        try:
            tot, avail, percent, used, free, active, inactive, buffers = psutil.virtual_memory()
        except ValueError:
            tot, avail, percent, used, free, active, inactive, buffers, cached, shared = psutil.virtual_memory()
        tot, avail, used, free = tot / MEGA, avail / MEGA, used / MEGA, free / MEGA
        proc = PROCESS.memory_info()[1] / MEGA
        print('process = %s total = %s avail = %s used = %s free = %s percent = %s'
              % (proc, tot, avail, used, free, percent))
    
    
    def alloc_max_array():
        i = 0
        ar = []
        while True:
            try:
                #ar.append(MEGA_STR)  # no copy if reusing the same string!
                ar.append(MEGA_STR + str(i))
            except MemoryError:
                break
            i += 1
        max_i = i - 1
        print('maximum array allocation:', max_i)
        pmem()
    
    
    def alloc_max_str():
        i = 0
        while True:
            try:
                a = ' ' * (i * 10 * MEGA)
                del a
            except MemoryError:
                break
            i += 1
        max_i = i - 1
        _ = ' ' * (max_i * 10 * MEGA)
        print('maximum string allocation', max_i)
        pmem()
    
    pmem()
    alloc_max_str()
    alloc_max_array()
    

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