1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
from __future__ import with_statement
import os
import sys
import struct
_vmvalue_scale = {'kB': 1024, 'mB': 1024*1024, 'KB': 1024, 'MB': 1024*1024}
def get_vmvalue_from_procfs(vmkey='VmSize', pid=None):
"""Return virtual memory value (in bytes) for the given pid using the /proc
filesystem. If pid is not given, it default to the current process pid.
Available keys are: VmSize, VmRSS (default), VmStk
"""
if pid is None:
pid = os.getpid()
try:
t = open('/proc/%d/status' % pid)
except IOError:
raise RuntimeError("/proc filesystem not supported")
if sys.platform == "sunos5":
return _vmvalue_solaris(vmkey, pid)
else:
v = t.read()
t.close()
# get vmkey line e.g. 'VmRSS: 9999 kB\n ...'
i = v.index(vmkey + ':')
v = v[i:].split(None, 3) # whitespace
if len(v) < 3:
return 0 # invalid format?
# convert Vm value to bytes
return int(v[1]) * _vmvalue_scale[v[2]]
def procfs_supported():
try:
open('/proc/%d/status' % os.getpid())
except IOError:
return False
else:
return True
def _vmvalue_solaris(vmkey, pid):
# Memory layout for struct psinfo.
# http://docs.sun.com/app/docs/doc/816-5174/proc-4?l=en&a=view
_psinfo_struct_format = (
"10i" # pr_flag [0] through pr_egid [9]
"5L" # pr_addr [10] through pr_ttyydev [14]
"2H" # pr_pctcpu [15] and pr_pctmem [16]
"6l" # pr_start [17-18] through pr_ctime [21-22]
"16s" # pr_fname [23]
"80s" # pr_psargs [24]
"2i" # pr_wstat[25] and pr_argc [26]
"2L" # pr_argv [27] and pr_envp [28]
"b3x" # pr_dmodel[29] and pr_pad2
"7i" # pr_taskid [30] through pr_filler
"20i6l" # pr_lwp
)
psinfo_file = os.path.join("/proc", str(pid), "psinfo")
with open(psinfo_file) as f:
parts = struct.unpack(_psinfo_struct_format, f.read())
vmkey_index = {
'VmSize' : 11, # pr_size
'VmRSS' : 12, # pr_rssize
}
vm_in_kB = parts[vmkey_index[vmkey]]
return vm_in_kB * 1024
|
