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    <p>A simple solution for Linux and other systems with <code>/proc/self/status</code> is the following code, which I use in a project of mine:</p> <pre><code>def memory_usage(): """Memory usage of the current process in kilobytes.""" status = None result = {'peak': 0, 'rss': 0} try: # This will only work on systems with a /proc file system # (like Linux). status = open('/proc/self/status') for line in status: parts = line.split() key = parts[0][2:-1].lower() if key in result: result[key] = int(parts[1]) finally: if status is not None: status.close() return result </code></pre> <p>It returns the current and peak resident memory size (which is probably what people mean when they talk about how much RAM an application is using). It is easy to extend it to grab other pieces of information from the <code>/proc/self/status</code> file.</p> <p>For the curious: the full output of <code>cat /proc/self/status</code> looks like this:</p> <pre><code>% cat /proc/self/status Name: cat State: R (running) Tgid: 4145 Pid: 4145 PPid: 4103 TracerPid: 0 Uid: 1000 1000 1000 1000 Gid: 1000 1000 1000 1000 FDSize: 32 Groups: 20 24 25 29 40 44 46 100 1000 VmPeak: 3580 kB VmSize: 3580 kB VmLck: 0 kB VmHWM: 472 kB VmRSS: 472 kB VmData: 160 kB VmStk: 84 kB VmExe: 44 kB VmLib: 1496 kB VmPTE: 16 kB Threads: 1 SigQ: 0/16382 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000000000000 SigCgt: 0000000000000000 CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: ffffffffffffffff Cpus_allowed: 03 Cpus_allowed_list: 0-1 Mems_allowed: 1 Mems_allowed_list: 0 voluntary_ctxt_switches: 0 nonvoluntary_ctxt_switches: 0 </code></pre>
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    1. POPython equivalent of PHP's memory_get_usage()?
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    1. USMartin Geisler
    1. USMartin Geisler
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    1. COis the peak/resident in kb or bytes?
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      1. USShabbyrobe
    2. COGood question -- it's in kilobytes, I've added that information to the original answer.
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      1. USMartin Geisler
    3. COThanks heaps for the great answer. As an aside, would you have any idea why the peak ends up above 80mb(!!!) if I spawn a bunch of threads, even though the resident stays relatively low? Also, do you have any clues as to how to do this on Win32?
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