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# Copyright 2014 The Chromium Authors. All rights reserved.
# 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 os
import re
import sys
def GetDefaultConcurrentLinks():
# Inherit the legacy environment variable for people that have set it in GYP.
pool_size = int(os.getenv('GYP_LINK_CONCURRENCY', 0))
if pool_size:
return pool_size
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()
stat.dwLength = ctypes.sizeof(stat)
ctypes.windll.kernel32.GlobalMemoryStatusEx(ctypes.byref(stat))
mem_limit = max(1, stat.ullTotalPhys / (4 * (2 ** 30))) # total / 4GB
hard_cap = max(1, int(os.getenv('GYP_LINK_CONCURRENCY_MAX', 2**32)))
return min(mem_limit, hard_cap)
elif sys.platform.startswith('linux'):
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
# Allow 8Gb per link on Linux because Gold is quite memory hungry
return max(1, int(match.group(1)) / (8 * (2 ** 20)))
return 1
elif sys.platform == 'darwin':
try:
avail_bytes = int(subprocess.check_output(['sysctl', '-n', 'hw.memsize']))
# A static library debug build of Chromium's unit_tests takes ~2.7GB, so
# 4GB per ld process allows for some more bloat.
return max(1, avail_bytes / (4 * (2 ** 30))) # total / 4GB
except:
return 1
else:
# TODO(scottmg): Implement this for other platforms.
return 1
print GetDefaultConcurrentLinks()
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