Question

内存监控：任何人都可以发布C ++代码来打印Linux中可访问进程的PSS（比例集大小）。给定python代码执行相同的操作：

导入os，sys，re，pwd

'''
Print the user name, pid, pss, and the command line for all accessable
processes in pss descending order.
'''
# Get the user name, pid, pss, and the command line information for all
# processes that are accessable. Ignore processes where the permission is
# denied.
ls = []   # [(user, pid, pss, cmd)]
for pid in filter(lambda x: x.isdigit(), os.listdir('/proc')):
    try:
        ls.append((owner_of_process(pid), pid, pss_of_process(pid), cmdline_of_process(pid)))
    except IOError:
        pass

# Calculate the max length of the user name, pid, and pss in order to
# print them in aligned columns.
userlen = 0
pidlen = 0
psslen = 0
for (user, pid, pss, cmd) in ls:
    userlen = max(userlen, len(user))
    pidlen = max(pidlen, len(pid))
    psslen = max(psslen, len(str(pss)))

# Get the width of the terminal.
with os.popen('tput cols') as fp:
    term_width = int(fp.read().strip())

# Print the information. Ignore kernel modules since they allocate memory
# from the kernel land, not the user land, and PSS is the memory
# consumption of processes in user land.
fmt = '%%-%ds  %%%ds  %%%ds  %%s' % (userlen, pidlen, psslen)
print(fmt % ('USER', 'PID', 'PSS', 'COMMAND'))
for (user, pid, pss, cmd) in sorted(ls, lambda x, y: cmp(y[2], x[2])):
    if cmd != '':
        print((fmt % (user, pid, pss, cmd))[:term_width - 1])

def pss_of_process（pid）：＆＃39;＆＃39;＆＃39; 返回由KiB（1024字节单位）中的pid指定的进程的PSS

@param pid  process ID
@return     PSS value
'''
with file('/proc/%s/smaps' % pid) as fp:
    return sum([int(x) for x in re.findall('^Pss:\s+(\d+)', fp.read(), re.M)])

def cmdline_of_process（pid）：＆＃39;＆＃39;＆＃39; 返回由pid指定的进程的命令行。

@param pid  process ID
@return     command line
'''
with file('/proc/%s/cmdline' % pid) as fp:
    return fp.read().replace('\0', ' ').strip()

def owner_of_process（pid）：＆＃39;＆＃39;＆＃39; 返回pid指定的进程的所有者。

@param pid  process ID
@return     owner
'''
return pwd.getpwuid(os.stat('/proc/%s' % pid).st_uid).pw_name

如果名称 ==＆＃39; 主要＆＃39;： pss_main（）

内存监控：用于在linux中打印可访问进程的PSS（比例集大小）的C ++代码

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