ps_mem.py: add

Signed-off-by: Florian Pritz <bluewind@xssn.at>

1 files changed, 240 insertions, 0 deletions

diff --git a/ps_mem.py b/ps_mem.py
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+++ b/ps_mem.py
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+#!/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
+# 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/$pid/smaps
+#                           as otherwise could match libraries causing a crash.
+#                           Patch from patrice.bouchand.fedora@gmail.com
+# V1.9      20 Feb 2008     Fix invalid values reported when PSS is available.
+#                           Reported by Andrey Borzenkov <arvidjaar@mail.ru>
+
+# Notes:
+#
+# All interpreted programs where the interpreter is started
+# by the shell or with env, will be merged to the interpreter
+# (as that's what's given to exec). For e.g. all python programs
+# starting with "#!/usr/bin/env python" will be grouped under python.
+# You can change this by changing comm= to args= below but that will
+# have the undesirable affect of splitting up programs started with
+# differing parameters (for e.g. mingetty tty[1-6]).
+#
+# For 2.6 kernels up to and including 2.6.13 and later 2.4 redhat kernels
+# (rmap vm without smaps) it can not be accurately determined how many pages
+# are shared between processes in general or within a program in our case:
+# http://lkml.org/lkml/2005/7/6/250
+# A warning is printed if overestimation is possible.
+# In addition for 2.6 kernels up to 2.6.9 inclusive, the shared
+# value in /proc/$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, string
+
+if os.geteuid() != 0:
+    sys.stderr.write("Sorry, root permission required.\n");
+    sys.exit(1)
+
+PAGESIZE=os.sysconf("SC_PAGE_SIZE")/1024 #KiB
+our_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 cmd
+
+cmds={}
+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 program
+total=0
+for cmd in cmds.keys():
+    cmds[cmd]=cmds[cmd]+shareds[cmd]
+    total+=cmds[cmd] #valid if PSS available
+
+sort_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.py
+def 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 cmd
+
+print " 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 "=" * 33
+print "\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 reported
+def 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 1
+
+vm_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"
+    )