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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
#
#
# Nimrod's Runtime Library
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Profiling support for Nimrod. This is an embedded profiler that requires
## ``--profiler:on``. You only need to import this module to get a profiling
## report at program exit.
when not defined(profiler):
{.warning: "Profiling support is turned off!".}
# We don't want to profile the profiling code ...
{.push profiler: off.}
import hashes, algorithm, strutils, tables, sets
include "system/timers"
const
withThreads = compileOption("threads")
tickCountCorrection = 50_000
when not defined(system.TStackTrace):
type TStackTrace = array [0..20, cstring]
# We use a simple hash table of bounded size to keep track of the stack traces:
type
TProfileEntry = object
total: int
st: TStackTrace
TProfileData = array [0..64*1024-1, ptr TProfileEntry]
proc `==`(a, b: TStackTrace): bool =
for i in 0 .. high(a):
if a[i] != b[i]: return false
result = true
# XXX extract this data structure; it is generally useful ;-)
# However a chain length of over 3000 is suspicious...
var
profileData: TProfileData
emptySlots = profileData.len * 3 div 2
maxChainLen = 0
totalCalls = 0
var
interval: TNanos = 1_000_000 - tickCountCorrection # 5ms
proc setSamplingFrequency*(intervalInUs: int) =
## set this to change the sampling frequency. Default value is 5ms.
## Set it to 0 to disable time based profiling; it uses an imprecise
## instruction count measure instead then.
if intervalInUs <= 0: interval = 0
else: interval = intervalInUs * 1000 - tickCountCorrection
when withThreads:
var
profilingLock: TLock
InitLock profilingLock
proc hookAux(st: TStackTrace) =
# this is quite performance sensitive!
when withThreads: Acquire profilingLock
inc totalCalls
var last = high(st)
while last > 0 and isNil(st[last]): dec last
var h = hash(pointer(st[last])) and high(profileData)
# we use probing for maxChainLen entries and replace the encountered entry
# with the minimal 'total' value:
if emptySlots == 0:
var minIdx = h
var probes = maxChainLen
while probes >= 0:
if profileData[h].st == st:
# wow, same entry found:
inc profileData[h].total
return
if profileData[minIdx].total < profileData[h].total:
minIdx = h
h = ((5 * h) + 1) and high(profileData)
dec probes
profileData[minIdx].total = 1
profileData[minIdx].st = st
else:
var chain = 0
while true:
if profileData[h] == nil:
profileData[h] = cast[ptr TProfileEntry](
allocShared0(sizeof(TProfileEntry)))
profileData[h].total = 1
profileData[h].st = st
dec emptySlots
break
if profileData[h].st == st:
# wow, same entry found:
inc profileData[h].total
break
h = ((5 * h) + 1) and high(profileData)
inc chain
maxChainLen = max(maxChainLen, chain)
when withThreads: Release profilingLock
var
t0 {.threadvar.}: TTicks
proc hook(st: TStackTrace) {.nimcall.} =
if interval == 0:
hookAux(st)
elif getticks() - t0 > interval:
hookAux(st)
t0 = getticks()
proc getTotal(x: ptr TProfileEntry): int =
result = if isNil(x): 0 else: x.total
proc cmpEntries(a, b: ptr TProfileEntry): int =
result = b.getTotal - a.getTotal
proc `//`(a, b: int): string =
result = format("$1/$2 = $3%", a, b, formatFloat(a / b * 100.0, ffDefault, 2))
proc writeProfile() {.noconv.} =
when defined(system.TStackTrace):
system.profilerHook = nil
const filename = "profile_results.txt"
echo "writing " & filename & "..."
var f: TFile
if open(f, filename, fmWrite):
sort(profileData, cmpEntries)
writeln(f, "total executions of each stack trace:")
var entries = 0
for i in 0..high(profileData):
if profileData[i] != nil: inc entries
var perProc = initCountTable[string]()
for i in 0..entries-1:
var dups = initSet[string]()
for ii in 0..high(TStackTrace):
let procname = profileData[i].st[ii]
if isNil(procname): break
let p = $procname
if not containsOrIncl(dups, p):
perProc.inc(p, profileData[i].total)
var sum = 0
# only write the first 100 entries:
for i in 0..min(100, entries-1):
if profileData[i].total > 1:
inc sum, profileData[i].total
writeln(f, "Entry: ", i+1, "/", entries, " Calls: ",
profileData[i].total // totalCalls, " [sum: ", sum, "; ",
sum // totalCalls, "]")
for ii in 0..high(TStackTrace):
let procname = profileData[i].st[ii]
if isNil(procname): break
writeln(f, " ", procname, " ", perProc[$procname] // totalCalls)
close(f)
echo "... done"
else:
echo "... failed"
var
disabled: int
proc disableProfiling*() =
atomicDec disabled
system.profilerHook = nil
proc enableProfiling*() =
if atomicInc(disabled) >= 0:
system.profilerHook = hook
when defined(system.TStackTrace):
system.profilerHook = hook
addQuitProc(writeProfile)
{.pop.}
|