Python获得进程内存使用量的脚本，python获得进程脚本,#!/usr/bin/e
#!/usr/bin/env python# Try to determine how much RAM is currently being used per program.# Note per _program_, not per process. So for example this script# will report RAM used by all httpd process together. In detail it reports:# sum(private RAM for program processes) + sum(Shared RAM for program processes)# The shared RAM is problematic to calculate, and this script automatically# selects the most accurate method available for your kernel.# Licence: LGPLv2# Author: P@draigBrady.com# Source: http://www.pixelbeat.org/scripts/ps_mem.py# V1.0 06 Jul 2005 Initial release# V1.1 11 Aug 2006 root permission required for accuracy# V1.2 08 Nov 2006 Add total to output# Use KiB,MiB,... for units rather than K,M,...# V1.3 22 Nov 2006 Ignore shared col from /proc/$pid/statm for# 2.6 kernels up to and including 2.6.9.# There it represented the total file backed extent# V1.4 23 Nov 2006 Remove total from output as it's meaningless# (the shared values overlap with other programs).# Display the shared column. This extra info is# useful, especially as it overlaps between programs.# V1.5 26 Mar 2007 Remove redundant recursion from human()# V1.6 05 Jun 2007 Also report number of processes with a given name.# Patch from riccardo.murri@gmail.com# V1.7 20 Sep 2007 Use PSS from /proc/$pid/smaps if available, which# fixes some over-estimation and allows totalling.# Enumerate the PIDs directly rather than using ps,# which fixes the possible race between reading# RSS with ps, and shared memory with this program.# Also we can show non truncated command names.# V1.8 28 Sep 2007 More accurate matching for stats in /proc/$pid/smaps# as otherwise could match libraries causing a crash.# Patch from patrice.bouchand.fedora@gmail.com# V1.9 20 Feb 2008 Fix invalid values reported when PSS is available.# Reported by Andrey Borzenkov <arvidjaar@mail.ru># V3.3 24 Jun 2014# http://github.com/pixelb/scripts/commits/master/scripts/ps_mem.py# Notes:## All interpreted programs where the interpreter is started# by the shell or with env, will be merged to the interpreter# (as that's what's given to exec). For e.g. all python programs# starting with "#!/usr/bin/env python" will be grouped under python.# You can change this by using the full command line but that will# have the undesirable affect of splitting up programs started with# differing parameters (for e.g. mingetty tty[1-6]).## For 2.6 kernels up to and including 2.6.13 and later 2.4 redhat kernels# (rmap vm without smaps) it can not be accurately determined how many pages# are shared between processes in general or within a program in our case:# http://lkml.org/lkml/2005/7/6/250# A warning is printed if overestimation is possible.# In addition for 2.6 kernels up to 2.6.9 inclusive, the shared# value in /proc/$pid/statm is the total file-backed extent of a process.# We ignore that, introducing more overestimation, again printing a warning.# Since kernel 2.6.23-rc8-mm1 PSS is available in smaps, which allows# us to calculate a more accurate value for the total RAM used by programs.## Programs that use CLONE_VM without CLONE_THREAD are discounted by assuming# they're the only programs that have the same /proc/$PID/smaps file for# each instance. This will fail if there are multiple real instances of a# program that then use CLONE_VM without CLONE_THREAD, or if a clone changes# its memory map while we're checksumming each /proc/$PID/smaps.## I don't take account of memory allocated for a program# by other programs. For e.g. memory used in the X server for# a program could be determined, but is not.## FreeBSD is supported if linprocfs is mounted at /compat/linux/proc/# FreeBSD 8.0 supports up to a level of Linux 2.6.16import getoptimport timeimport errnoimport osimport systry: # md5 module is deprecated on python 2.6 # so try the newer hashlib first import hashlib md5_new = hashlib.md5except ImportError: import md5 md5_new = md5.new# The following exits cleanly on Ctrl-C or EPIPE# while treating other exceptions as before.def std_exceptions(etype, value, tb): sys.excepthook = sys.__excepthook__ if issubclass(etype, KeyboardInterrupt): pass elif issubclass(etype, IOError) and value.errno == errno.EPIPE: pass else: sys.__excepthook__(etype, value, tb)sys.excepthook = std_exceptions## Define some global variables#PAGESIZE = os.sysconf("SC_PAGE_SIZE") / 1024 #KiBour_pid = os.getpid()have_pss = 0class Proc: def __init__(self): uname = os.uname() if uname[0] == "FreeBSD": self.proc = '/compat/linux/proc' else: self.proc = '/proc' def path(self, *args): return os.path.join(self.proc, *(str(a) for a in args)) def open(self, *args): try: return open(self.path(*args)) except (IOError, OSError): val = sys.exc_info()[1] if (val.errno == errno.ENOENT or # kernel thread or process gone val.errno == errno.EPERM): raise LookupError raiseproc = Proc()## Functions#def parse_options(): try: long_options = ['split-args', 'help', 'total'] opts, args = getopt.getopt(sys.argv[1:], "shtp:w:", long_options) except getopt.GetoptError: sys.stderr.write(help()) sys.exit(3) if len(args): sys.stderr.write("Extraneous arguments: %s\n" % args) sys.exit(3) # ps_mem.py options split_args = False pids_to_show = None watch = None only_total = False for o, a in opts: if o in ('-s', '--split-args'): split_args = True if o in ('-t', '--total'): only_total = True if o in ('-h', '--help'): sys.stdout.write(help()) sys.exit(0) if o in ('-p',): try: pids_to_show = [int(x) for x in a.split(',')] except: sys.stderr.write(help()) sys.exit(3) if o in ('-w',): try: watch = int(a) except: sys.stderr.write(help()) sys.exit(3) return (split_args, pids_to_show, watch, only_total)def help(): help_msg = 'Usage: ps_mem [OPTION]...\n' \ 'Show program core memory usage\n' \ '\n' \ ' -h, -help Show this help\n' \ ' -p <pid>[,pid2,...pidN] Only show memory usage PIDs in the specified list\n' \ ' -s, --split-args Show and separate by, all command line arguments\n' \ ' -t, --total Show only the total value\n' \ ' -w <N> Measure and show process memory every N seconds\n' return help_msg#(major,minor,release)def kernel_ver(): kv = proc.open('sys/kernel/osrelease').readline().split(".")[:3] last = len(kv) if last == 2: kv.append('0') last -= 1 while last > 0: for char in "-_": kv[last] = kv[last].split(char)[0] try: int(kv[last]) except: kv[last] = 0 last -= 1 return (int(kv[0]), int(kv[1]), int(kv[2]))#return Private,Shared#Note shared is always a subset of rss (trs is not always)def getMemStats(pid): global have_pss mem_id = pid #unique Private_lines = [] Shared_lines = [] Pss_lines = [] Rss = (int(proc.open(pid, 'statm').readline().split()[1]) * PAGESIZE) if os.path.exists(proc.path(pid, 'smaps')): #stat digester = md5_new() for line in proc.open(pid, 'smaps').readlines(): #open # Note we checksum smaps as maps is usually but # not always different for separate processes. digester.update(line.encode('latin1')) if line.startswith("Shared"): Shared_lines.append(line) elif line.startswith("Private"): Private_lines.append(line) elif line.startswith("Pss"): have_pss = 1 Pss_lines.append(line) mem_id = digester.hexdigest() Shared = sum([int(line.split()[1]) for line in Shared_lines]) Private = sum([int(line.split()[1]) for line in Private_lines]) #Note Shared + Private = Rss above #The Rss in smaps includes video card mem etc. if have_pss: pss_adjust = 0.5 # add 0.5KiB as this avg error due to trunctation Pss = sum([float(line.split()[1])+pss_adjust for line in Pss_lines]) Shared = Pss - Private elif (2,6,1) <= kernel_ver() <= (2,6,9): Shared = 0 #lots of overestimation, but what can we do? Private = Rss else: Shared = int(proc.open(pid, 'statm').readline().split()[2]) Shared *= PAGESIZE Private = Rss - Shared return (Private, Shared, mem_id)def getCmdName(pid, split_args): cmdline = proc.open(pid, 'cmdline').read().split("\0") if cmdline[-1] == '' and len(cmdline) > 1: cmdline = cmdline[:-1] path = proc.path(pid, 'exe') try: path = os.readlink(path) # Some symlink targets were seen to contain NULs on RHEL 5 at least # https://github.com/pixelb/scripts/pull/10, so take string up to NUL path = path.split('\0')[0] except OSError: val = sys.exc_info()[1] if (val.errno == errno.ENOENT or # either kernel thread or process gone val.errno == errno.EPERM): raise LookupError raise if split_args: return " ".join(cmdline) if path.endswith(" (deleted)"): path = path[:-10] if os.path.exists(path): path += " [updated]" else: #The path could be have prelink stuff so try cmdline #which might have the full path present. This helped for: #/usr/libexec/notification-area-applet.#prelink#.fX7LCT (deleted) if os.path.exists(cmdline[0]): path = cmdline[0] + " [updated]" else: path += " [deleted]" exe = os.path.basename(path) cmd = proc.open(pid, 'status').readline()[6:-1] if exe.startswith(cmd): cmd = exe #show non truncated version #Note because we show the non truncated name #one can have separated programs as follows: #584.0 KiB + 1.0 MiB = 1.6 MiB mozilla-thunder (exe -> bash) # 56.0 MiB + 22.2 MiB = 78.2 MiB mozilla-thunderbird-bin return cmd#The following matches "du -h" output#see also human.pydef human(num, power="Ki", units=None): if units is None: powers = ["Ki", "Mi", "Gi", "Ti"] while num >= 1000: #4 digits num /= 1024.0 power = powers[powers.index(power)+1] return "%.1f %sB" % (num, power) else: return "%.f" % ((num * 1024) / units)def cmd_with_count(cmd, count): if count > 1: return "%s (%u)" % (cmd, count) else: return cmd#Warn of possible inaccuracies#2 = accurate & can total#1 = accurate only considering each process in isolation#0 = some shared mem not reported#-1= all shared mem not reporteddef shared_val_accuracy(): """http://wiki.apache.org/spamassassin/TopSharedMemoryBug""" kv = kernel_ver() pid = os.getpid() if kv[:2] == (2,4): if proc.open('meminfo').read().find("Inact_") == -1: return 1 return 0 elif kv[:2] == (2,6): if os.path.exists(proc.path(pid, 'smaps')): if proc.open(pid, 'smaps').read().find("Pss:")!=-1: return 2 else: return 1 if (2,6,1) <= kv <= (2,6,9): return -1 return 0 elif kv[0] > 2 and os.path.exists(proc.path(pid, 'smaps')): return 2 else: return 1def show_shared_val_accuracy( possible_inacc, only_total=False ): level = ("Warning","Error")[only_total] if possible_inacc == -1: sys.stderr.write( "%s: Shared memory is not reported by this system.\n" % level ) sys.stderr.write( "Values reported will be too large, and totals are not reported\n" ) elif possible_inacc == 0: sys.stderr.write( "%s: Shared memory is not reported accurately by this system.\n" % level ) sys.stderr.write( "Values reported could be too large, and totals are not reported\n" ) elif possible_inacc == 1: sys.stderr.write( "%s: Shared memory is slightly over-estimated by this system\n" "for each program, so totals are not reported.\n" % level ) sys.stderr.close() if only_total and possible_inacc != 2: sys.exit(1)def get_memory_usage( pids_to_show, split_args, include_self=False, only_self=False ): cmds = {} shareds = {} mem_ids = {} count = {} for pid in os.listdir(proc.path('')): if not pid.isdigit(): continue pid = int(pid) # Some filters if only_self and pid != our_pid: continue if pid == our_pid and not include_self: continue if pids_to_show is not None and pid not in pids_to_show: continue try: cmd = getCmdName(pid, split_args) except LookupError: #operation not permitted #kernel threads don't have exe links or #process gone continue try: private, shared, mem_id = getMemStats(pid) except RuntimeError: continue #process gone if shareds.get(cmd): if have_pss: #add shared portion of PSS together shareds[cmd] += shared elif shareds[cmd] < shared: #just take largest shared val shareds[cmd] = shared else: shareds[cmd] = shared cmds[cmd] = cmds.setdefault(cmd, 0) + private if cmd in count: count[cmd] += 1 else: count[cmd] = 1 mem_ids.setdefault(cmd, {}).update({mem_id:None}) #Add shared mem for each program total = 0 for cmd in cmds: cmd_count = count[cmd] if len(mem_ids[cmd]) == 1 and cmd_count > 1: # Assume this program is using CLONE_VM without CLONE_THREAD # so only account for one of the processes cmds[cmd] /= cmd_count if have_pss: shareds[cmd] /= cmd_count cmds[cmd] = cmds[cmd] + shareds[cmd] total += cmds[cmd] #valid if PSS available sorted_cmds = sorted(cmds.items(), key=lambda x:x[1]) sorted_cmds = [x for x in sorted_cmds if x[1]] return sorted_cmds, shareds, count, totaldef print_header(): sys.stdout.write(" Private + Shared = RAM used\tProgram\n\n")def print_memory_usage(sorted_cmds, shareds, count, total): for cmd in sorted_cmds: sys.stdout.write("%9s + %9s = %9s\t%s\n" % (human(cmd[1]-shareds[cmd[0]]), human(shareds[cmd[0]]), human(cmd[1]), cmd_with_count(cmd[0], count[cmd[0]]))) if have_pss: sys.stdout.write("%s\n%s%9s\n%s\n" % ("-" * 33, " " * 24, human(total), "=" * 33))def verify_environment(): if os.geteuid() != 0: sys.stderr.write("Sorry, root permission required.\n") if __name__ == '__main__': sys.stderr.close() sys.exit(1) try: kv = kernel_ver() except (IOError, OSError): val = sys.exc_info()[1] if val.errno == errno.ENOENT: sys.stderr.write( "Couldn't access " + proc.path('') + "\n" "Only GNU/Linux and FreeBSD (with linprocfs) are supported\n") sys.exit(2) else: raiseif __name__ == '__main__': split_args, pids_to_show, watch, only_total = parse_options() verify_environment() if not only_total: print_header() if watch is not None: try: sorted_cmds = True while sorted_cmds: sorted_cmds, shareds, count, total = get_memory_usage( pids_to_show, split_args ) if only_total and have_pss: sys.stdout.write(human(total, units=1)+'\n') elif not only_total: print_memory_usage(sorted_cmds, shareds, count, total) time.sleep(watch) else: sys.stdout.write('Process does not exist anymore.\n') except KeyboardInterrupt: pass else: # This is the default behavior sorted_cmds, shareds, count, total = get_memory_usage( pids_to_show, split_args ) if only_total and have_pss: sys.stdout.write(human(total, units=1)+'\n') elif not only_total: print_memory_usage(sorted_cmds, shareds, count, total) # We must close explicitly, so that any EPIPE exception # is handled by our excepthook, rather than the default # one which is reenabled after this script finishes. sys.stdout.close() vm_accuracy = shared_val_accuracy() show_shared_val_accuracy( vm_accuracy, only_total )
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