获得进程内存使用量的Python脚本详解编程语言

# 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: [email protected] # 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/$pid/statm for # 2.6 kernels up to and including 2.6.9. # There it represented the total file backed extent # V1.4 23 Nov 2006 Remove total from output as its meaningless # (the shared values overlap with other programs). # Display the shared column. This extra info is # useful, especially as it overlaps between programs. # V1.5 26 Mar 2007 Remove redundant recursion from human() # V1.6 05 Jun 2007 Also report number of processes with a given name. # Patch from [email protected] # V1.7 20 Sep 2007 Use PSS from /proc/$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/$pid/smaps # as otherwise could match libraries causing a crash. # Patch from [email protected] # V1.9 20 Feb 2008 Fix invalid values reported when PSS is available. # Reported by Andrey Borzenkov [email protected] # V3.3 24 Jun 2014 # http://github.com/pixelb/scripts/commits/master/scripts/ps_mem.py # Notes: # All interpreted programs where the interpreter is started # by the shell or with env, will be merged to the interpreter # (as thats whats given to exec). For e.g. all python programs # starting with "#!/usr/bin/env python" will be grouped under python. # You can change this by using the full command line but that will # have the undesirable affect of splitting up programs started with # differing parameters (for e.g. mingetty tty[1-6]). # For 2.6 kernels up to and including 2.6.13 and later 2.4 redhat kernels # (rmap vm without smaps) it can not be accurately determined how many pages # are shared between processes in general or within a program in our case: # http://lkml.org/lkml/2005/7/6/250 # A warning is printed if overestimation is possible. # In addition for 2.6 kernels up to 2.6.9 inclusive, the shared # value in /proc/$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 # theyre the only programs that have the same /proc/$PID/smaps file for # each instance. This will fail if there are multiple real instances of a # program that then use CLONE_VM without CLONE_THREAD, or if a clone changes # its memory map while were checksumming each /proc/$PID/smaps. # I dont 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 2.6.16 import getopt import time import errno import os import sys try: # md5 module is deprecated on python 2.6 # so try the newer hashlib first import hashlib md5_new = hashlib.md5 except 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 #KiB our_pid = os.getpid() have_pss = 0 class 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 raise proc = 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.py def 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 reported def 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 1 def 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 dont 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, total def 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( "Couldnt access " + proc.path() + "/n" "Only GNU/Linux and FreeBSD (with linprocfs) are supported/n") sys.exit(2) else: raise if __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 )

原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/8212.html

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