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'''
自制模块包
'''
::-- ZoomQuiet [<<DateTime(2007-09-03T04:52:28Z)>>]
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= cpu,内存和网络的使用率 =
{{{Qiangning Hong <hongqn@gmail.com> 		 hide details	 11:29 am (35 minutes ago) 
	reply-to		python-cn@googlegroups.com	 
	to		python-cn@googlegroups.com	 
	date		Sep 3, 2007 11:29 AM	 
	subject		[CPyUG:31609] Re: 什么lib可以得到cpu,内存和网络的使用率	 
	mailed-by		googlegroups.com	 
On 9/3/07, 边 江 <borderj@gmail.com> wrote:
> 想用python写个得到cpu，内存和网络的使用率的小程序，主要在windows系统中，要是可以跨平台最好不过。
>
> 不知道python自带的有没有这个lib，要是没有能不能推荐个lib。
}}}

很久以前写的代码，在windows下获得CPU和内存使用情况：

{{{#!python
import win32pdh

# Counter paths
PROCESSOR_PERCENT = r'\Processor(_Total)\% Processor Time'
MEMORY_PERCENT = r'\Memory\% Committed Bytes In Use'
MEMORY_COMMITTED = r'\Memory\Committed Bytes'
PROCESS_BYTES = lambda x: r'\Process(%s)\Private Bytes' % x

class Query:
    def __init__(self):
        self.counters = {}
        self.query = None
        self.query = win32pdh.OpenQuery(None, 0)

    def add_counter(self, path):
        if win32pdh.ValidatePath(path) != 0:
            raise Exception('Invalid path: %s' % path)
        counter = win32pdh.AddCounter(self.query, path, 0)
        self.counters[path] = counter

    def remove_counter(self, path):
        win32pdh.RemoveCounter(self.counters[path])
        del self.counters[path]

    def get_values(self):
        values = {}
        win32pdh.CollectQueryData(self.query)
        for path in self.counters:
            status, value = win32pdh.GetFormattedCounterValue(
                    self.counters[path], win32pdh.PDH_FMT_LONG)
            values[path] = value
        return values

sysinfo_query = Query()
sysinfo_query.add_counter(PROCESSOR_PERCENT)
sysinfo_query.add_counter(MEMORY_PERCENT)
sysinfo_query.get_values()

def get_sysinfo():
    """Return a tuple (mem_usage, cpu_usage)."""
    info = sysinfo_query.get_values()
    return info[MEMORY_PERCENT], info[PROCESSOR_PERCENT]

}}}*nix系统下，用管道分析 uptime 和 free 命令的输出就可以了。

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