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
|
import csv
from collections import namedtuple
import os
import shutil
import sys
import time
import coverage
from tests.coveragetest import CoverageTest
class StressResult(namedtuple('StressResult', ['files', 'calls', 'lines', 'baseline', 'covered'])):
@property
def overhead(self):
return self.covered - self.baseline
NANOS = 1e9
TEST_FILE = """\
def parent(call_count, line_count):
for _ in range(call_count):
child(line_count)
def child(line_count):
for i in range(line_count):
x = 1
"""
def mk_main(file_count, call_count, line_count):
lines = []
lines.extend("import test{}".format(idx) for idx in range(file_count))
lines.extend("test{}.parent({}, {})".format(idx, call_count, line_count) for idx in range(file_count))
return "\n".join(lines)
class StressTest(CoverageTest):
def _compute_overhead(self, file_count, call_count, line_count):
self.clean_local_file_imports()
for idx in range(file_count):
self.make_file('test{}.py'.format(idx), TEST_FILE)
self.make_file('testmain.py', mk_main(file_count, call_count, line_count))
start = time.perf_counter()
self.import_local_file("testmain", None)
baseline = time.perf_counter() - start
self.clean_local_file_imports()
start = time.perf_counter()
cov = coverage.Coverage()
cov.start()
try: # pragma: nested
# Import the Python file, executing it.
mod = self.import_local_file("testmain", None)
finally: # pragma: nested
# Stop coverage.py.
covered = time.perf_counter() - start
stats = cov.collector.tracers[0].get_stats().copy()
cov.stop()
actual_file_count = 6 + file_count
actual_call_count = 68 + file_count * (1 + 1 + call_count + call_count + call_count)
actual_line_count = 295 + file_count
if stats is not None:
print("File counts", file_count, actual_file_count, stats['new_files'])
print("Call counts", call_count, actual_call_count, stats['calls'])
print("Line counts", line_count, actual_line_count, stats['lines'])
return StressResult(
actual_file_count,
actual_call_count,
actual_line_count,
baseline,
covered,
)
def stress_test(self):
for i in range(3):
for j in range(3):
for k in range(3):
self._compute_overhead(100*i+1, 100*j+1, 100*k+1)
return
line_result = self._compute_overhead(1, 1, int(1e8))
call_result = self._compute_overhead(1, int(1e7), 1)
file_result = self._compute_overhead(int(1e4), 1, 1)
line_overhead_estimate = 0
call_overhead_estimate = 0
file_overhead_estimate = 0
for i in range(20):
line_overhead_estimate = (
line_result.overhead * NANOS -
call_overhead_estimate * line_result.calls -
file_overhead_estimate * line_result.files
) / line_result.lines
call_overhead_estimate = (
call_result.overhead * NANOS -
line_overhead_estimate * call_result.lines -
file_overhead_estimate * call_result.files
) / call_result.calls
file_overhead_estimate = (
file_result.overhead * NANOS -
call_overhead_estimate * file_result.calls -
line_overhead_estimate * file_result.lines
) / file_result.files
line_baseline_estimate = 0
call_baseline_estimate = 0
file_baseline_estimate = 0
for i in range(20):
line_baseline_estimate = (
line_result.baseline * NANOS -
call_baseline_estimate * line_result.calls -
file_baseline_estimate * line_result.files
) / line_result.lines
call_baseline_estimate = (
call_result.baseline * NANOS -
line_baseline_estimate * call_result.lines -
file_baseline_estimate * call_result.files
) / call_result.calls
file_baseline_estimate = (
file_result.baseline * NANOS -
call_baseline_estimate * file_result.calls -
line_baseline_estimate * file_result.lines
) / file_result.files
print("Line: {:.2f} ns baseline, {:.2f} ns overhead, {:.2%} overhead".format(
line_baseline_estimate,
line_overhead_estimate,
line_overhead_estimate/line_baseline_estimate,
))
print("Call: {:.2f} ns baseline, {:.2f} ns overhead, {:.2%} overhead".format(
call_baseline_estimate,
call_overhead_estimate,
call_overhead_estimate/call_baseline_estimate,
))
print("File: {:.2f} ns baseline, {:.2f} ns overhead, {:.2%} overhead".format(
file_baseline_estimate,
file_overhead_estimate,
file_overhead_estimate/file_baseline_estimate,
))
assert False
|