#!/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.# Author: P@draigBrady.com# 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/$pid/smaps# as otherwise could match libraries causing a crash.# Patch from patrice.bouchand.fedora@gmail.com# V1.9 20 Feb 2008 Fix invalid values reported when PSS is available.# Reported by Andrey Borzenkov <arvidjaar@mail.ru># Notes:## All interpreted programs where the interpreter is started# by the shell or with env, will be merged to the interpreter# (as that's what's given to exec). For e.g. all python programs# starting with "#!/usr/bin/env python" will be grouped under python.# You can change this by changing comm= to args= below but that will# have the undesirable affect of splitting up programs started with# differing parameters (for e.g. mingetty tty[1-6]).## For 2.6 kernels up to and including 2.6.13 and later 2.4 redhat kernels# (rmap vm without smaps) it can not be accurately determined how many pages# are shared between processes in general or within a program in our case:# http://lkml.org/lkml/2005/7/6/250# A warning is printed if overestimation is possible.# In addition for 2.6 kernels up to 2.6.9 inclusive, the shared# value in /proc/$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.## 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.import sys, os, stringif os.geteuid() != 0: sys.stderr.write("Sorry, root permission required.\n"); sys.exit(1)PAGESIZE=os.sysconf("SC_PAGE_SIZE")/1024 #KiBour_pid=os.getpid()#(major,minor,release)def kernel_ver(): kv=open("/proc/sys/kernel/osrelease").readline().split(".")[:3] for char in "-_": kv[2]=kv[2].split(char)[0] return (int(kv[0]), int(kv[1]), int(kv[2]))kv=kernel_ver()have_pss=0#return Private,Shared#Note shared is always a subset of rss (trs is not always)def getMemStats(pid): global have_pss Private_lines=[] Shared_lines=[] Pss_lines=[] Rss=int(open("/proc/"+str(pid)+"/statm").readline().split()[1])*PAGESIZE if os.path.exists("/proc/"+str(pid)+"/smaps"): #stat for line in open("/proc/"+str(pid)+"/smaps").readlines(): #open 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) 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 average error due to trunctation Pss=sum([float(line.split()[1])+pss_adjust for line in Pss_lines]) Shared = Pss - Private elif (2,6,1) <= kv <= (2,6,9): Shared=0 #lots of overestimation, but what can we do? Private = Rss else: Shared=int(open("/proc/"+str(pid)+"/statm").readline().split()[2]) Shared*=PAGESIZE Private = Rss - Shared return (Private, Shared)def getCmdName(pid): cmd = file("/proc/%d/status" % pid).readline()[6:-1] exe = os.path.basename(os.path.realpath("/proc/%d/exe" % pid)) 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 cmdcmds={}shareds={}count={}for pid in os.listdir("/proc/"): try: pid = int(pid) #note Thread IDs not listed in /proc/ which is good if pid == our_pid: continue except: continue try: cmd = getCmdName(pid) except: #permission denied or #kernel threads don't have exe links or #process gone continue try: private, shared = getMemStats(pid) except: 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 count.has_key(cmd): count[cmd] += 1 else: count[cmd] = 1#Add shared mem for each programtotal=0for cmd in cmds.keys(): cmds[cmd]=cmds[cmd]+shareds[cmd] total+=cmds[cmd] #valid if PSS availablesort_list = cmds.items()sort_list.sort(lambda x,y:cmp(x[1],y[1]))sort_list=filter(lambda x:x[1],sort_list) #get rid of zero sized processes#The following matches "du -h" output#see also human.pydef human(num, power="Ki"): powers=["Ki","Mi","Gi","Ti"] while num >= 1000: #4 digits num /= 1024.0 power=powers[powers.index(power)+1] return "%.1f %s" % (num,power)def cmd_with_count(cmd, count): if count>1: return "%s (%u)" % (cmd, count) else: return cmdprint " Private + Shared = RAM used\tProgram \n"for cmd in sort_list: print "%8sB + %8sB = %8sB\t%s" % (human(cmd[1]-shareds[cmd[0]]), human(shareds[cmd[0]]), human(cmd[1]), cmd_with_count(cmd[0], count[cmd[0]]))if have_pss: print "-" * 33 print " " * 24 + "%8sB" % human(total) print "=" * 33print "\n Private + Shared = RAM used\tProgram \n"#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""" if kv[:2] == (2,4): if open("/proc/meminfo").read().find("Inact_") == -1: return 1 return 0 elif kv[:2] == (2,6): if os.path.exists("/proc/"+str(os.getpid())+"/smaps"): if open("/proc/"+str(os.getpid())+"/smaps").read().find("Pss:")!=-1: return 2 else: return 1 if (2,6,1) <= kv <= (2,6,9): return -1 return 0 else: return 1vm_accuracy = shared_val_accuracy()if vm_accuracy == -1: sys.stderr.write( "Warning: Shared memory is not reported by this system.\n" ) sys.stderr.write( "Values reported will be too large, and totals are not reported\n" )elif vm_accuracy == 0: sys.stderr.write( "Warning: Shared memory is not reported accurately by this system.\n" ) sys.stderr.write( "Values reported could be too large, and totals are not reported\n" )elif vm_accuracy == 1: sys.stderr.write( "Warning: Shared memory is slightly over-estimated by this system\n" "for each program, so totals are not reported.\n" )