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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
#!/usr/bin/env python3
# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# This script computs the number of concurrent links we want to run in the build
# as a function of machine spec. It's based on GetDefaultConcurrentLinks in GYP.
import argparse
import multiprocessing
import os
import re
import subprocess
import sys
sys.path.insert(1, os.path.join(os.path.dirname(__file__), '..'))
import gn_helpers
def _GetMemoryMaxInCurrentCGroup(explanation):
with open("/proc/self/cgroup") as cgroup:
lines = cgroup.readlines()
if len(lines) >= 1:
cgroupname = lines[0].strip().split(':')[-1]
memmax = '/sys/fs/cgroup' + cgroupname + '/memory.max'
if os.path.exists(memmax):
with open(memmax) as f:
data = f.read().strip()
explanation.append(f'# cgroup {cgroupname} memory.max={data}')
try:
return int(data)
except ValueError as ex:
explanation.append(f'# cgroup memory.max exception {ex}')
return None
explanation.append(f'# cgroup memory.max not found')
return None
def _GetCPUCountFromCurrentCGroup(explanation):
with open("/proc/self/cgroup") as cgroup:
lines = cgroup.readlines()
if len(lines) >= 1:
cgroupname = lines[0].strip().split(':')[-1]
cpuset = '/sys/fs/cgroup' + cgroupname + '/cpuset.cpus'
if os.path.exists(cpuset):
with open(cpuset) as f:
data = f.read().strip()
explanation.append(f'# cgroup {cgroupname} cpuset.cpus={data}')
try:
return _CountCPUs(data)
except ValueError as ex:
explanation.append(f'# cgroup cpuset.cpus exception {ex}')
return None
explanation.append(f'# cgroup cpuset.cpus not found')
return None
def _CountCPUs(cpuset):
n = 0
for s in cpuset.split(','):
r = s.split('-')
if len(r) == 1 and int(r[0]) >= 0:
n += 1
continue
elif len(r) == 2:
n += int(r[1]) - int(r[0]) + 1
else:
# wrong range?
return 0
return n
def _GetTotalMemoryInBytes(explanation):
if sys.platform in ('win32', 'cygwin'):
import ctypes
class MEMORYSTATUSEX(ctypes.Structure):
_fields_ = [
("dwLength", ctypes.c_ulong),
("dwMemoryLoad", ctypes.c_ulong),
("ullTotalPhys", ctypes.c_ulonglong),
("ullAvailPhys", ctypes.c_ulonglong),
("ullTotalPageFile", ctypes.c_ulonglong),
("ullAvailPageFile", ctypes.c_ulonglong),
("ullTotalVirtual", ctypes.c_ulonglong),
("ullAvailVirtual", ctypes.c_ulonglong),
("sullAvailExtendedVirtual", ctypes.c_ulonglong),
]
stat = MEMORYSTATUSEX(dwLength=ctypes.sizeof(MEMORYSTATUSEX))
ctypes.windll.kernel32.GlobalMemoryStatusEx(ctypes.byref(stat))
return stat.ullTotalPhys
elif sys.platform.startswith('linux'):
if os.path.exists("/proc/self/cgroup"):
memmax = _GetMemoryMaxInCurrentCGroup(explanation)
if memmax:
return memmax
if os.path.exists("/proc/meminfo"):
with open("/proc/meminfo") as meminfo:
memtotal_re = re.compile(r'^MemTotal:\s*(\d*)\s*kB')
for line in meminfo:
match = memtotal_re.match(line)
if not match:
continue
return float(match.group(1)) * 2**10
elif sys.platform == 'darwin':
try:
return int(subprocess.check_output(['sysctl', '-n', 'hw.memsize']))
except Exception:
return 0
# TODO(scottmg): Implement this for other platforms.
return 0
def _GetDefaultConcurrentLinks(per_link_gb, reserve_gb, thin_lto_type,
secondary_per_link_gb, override_ram_in_gb):
explanation = []
explanation.append(
'per_link_gb={} reserve_gb={} secondary_per_link_gb={}'.format(
per_link_gb, reserve_gb, secondary_per_link_gb))
if override_ram_in_gb:
mem_total_gb = override_ram_in_gb
else:
mem_total_gb = float(_GetTotalMemoryInBytes(explanation)) / 2**30
adjusted_mem_total_gb = max(0, mem_total_gb - reserve_gb)
# Ensure that there is at least as many links allocated for the secondary as
# there is for the primary. The secondary link usually uses fewer gbs.
mem_cap = int(
max(1, adjusted_mem_total_gb / (per_link_gb + secondary_per_link_gb)))
cpu_count = None
if sys.platform.startswith('linux'):
try:
if os.path.exists('/proc/self/cgroup'):
cpu_count = _GetCPUCountFromCurrentCGroup(explanation)
except Exception as ex:
explanation.append(f'# cpu_count from cgroup exception {ex}')
if not cpu_count:
try:
cpu_count = multiprocessing.cpu_count()
explanation.append(f'# cpu_count from multiprocessing {cpu_count}')
except Exception as ex:
cpu_count = 1
explanation.append(f'# cpu_count from multiprocessing exception {ex}')
# A local LTO links saturate all cores, but only for some amount of the link.
cpu_cap = cpu_count
if thin_lto_type is not None:
assert thin_lto_type == 'local'
cpu_cap = min(cpu_count, 6)
explanation.append(f'cpu_count={cpu_count} cpu_cap={cpu_cap} ' +
f'mem_total_gb={mem_total_gb:.1f}GiB ' +
f'adjusted_mem_total_gb={adjusted_mem_total_gb:.1f}GiB')
num_links = min(mem_cap, cpu_cap)
if num_links == cpu_cap:
if cpu_cap == cpu_count:
reason = 'cpu_count'
else:
reason = 'cpu_cap (thinlto)'
else:
reason = 'RAM'
# static link see too many open files if we have many concurrent links.
# ref: http://b/233068481
if num_links > 30:
num_links = 30
reason = 'nofile'
explanation.append('concurrent_links={} (reason: {})'.format(
num_links, reason))
# Use remaining RAM for a secondary pool if needed.
if secondary_per_link_gb:
mem_remaining = adjusted_mem_total_gb - num_links * per_link_gb
secondary_size = int(max(0, mem_remaining / secondary_per_link_gb))
if secondary_size > cpu_count:
secondary_size = cpu_count
reason = 'cpu_count'
else:
reason = 'mem_remaining={:.1f}GiB'.format(mem_remaining)
explanation.append('secondary_size={} (reason: {})'.format(
secondary_size, reason))
else:
secondary_size = 0
return num_links, secondary_size, explanation
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--mem_per_link_gb', type=int, default=8)
parser.add_argument('--reserve_mem_gb', type=int, default=0)
parser.add_argument('--secondary_mem_per_link', type=int, default=0)
parser.add_argument('--override-ram-in-gb-for-testing', type=float, default=0)
parser.add_argument('--thin-lto')
options = parser.parse_args()
primary_pool_size, secondary_pool_size, explanation = (
_GetDefaultConcurrentLinks(options.mem_per_link_gb,
options.reserve_mem_gb, options.thin_lto,
options.secondary_mem_per_link,
options.override_ram_in_gb_for_testing))
if options.override_ram_in_gb_for_testing:
print('primary={} secondary={} explanation={}'.format(
primary_pool_size, secondary_pool_size, explanation))
else:
sys.stdout.write(
gn_helpers.ToGNString({
'primary_pool_size': primary_pool_size,
'secondary_pool_size': secondary_pool_size,
'explanation': explanation,
}))
return 0
if __name__ == '__main__':
sys.exit(main())
|
