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64 lines
2.3 KiB
Python
64 lines
2.3 KiB
Python
# Copyright 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# This script computs the number of concurrent links we want to run in the build
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# as a function of machine spec. It's based on GetDefaultConcurrentLinks in GYP.
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import os
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import re
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import subprocess
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import sys
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def GetDefaultConcurrentLinks():
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# Inherit the legacy environment variable for people that have set it in GYP.
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pool_size = int(os.getenv('GYP_LINK_CONCURRENCY', 0))
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if pool_size:
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return pool_size
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if sys.platform in ('win32', 'cygwin'):
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import ctypes
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class MEMORYSTATUSEX(ctypes.Structure):
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_fields_ = [
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("dwLength", ctypes.c_ulong),
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("dwMemoryLoad", ctypes.c_ulong),
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("ullTotalPhys", ctypes.c_ulonglong),
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("ullAvailPhys", ctypes.c_ulonglong),
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("ullTotalPageFile", ctypes.c_ulonglong),
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("ullAvailPageFile", ctypes.c_ulonglong),
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("ullTotalVirtual", ctypes.c_ulonglong),
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("ullAvailVirtual", ctypes.c_ulonglong),
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("sullAvailExtendedVirtual", ctypes.c_ulonglong),
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]
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stat = MEMORYSTATUSEX(dwLength=ctypes.sizeof(MEMORYSTATUSEX))
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ctypes.windll.kernel32.GlobalMemoryStatusEx(ctypes.byref(stat))
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mem_limit = max(1, stat.ullTotalPhys / (4 * (2 ** 30))) # total / 4GB
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hard_cap = max(1, int(os.getenv('GYP_LINK_CONCURRENCY_MAX', 2**32)))
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return min(mem_limit, hard_cap)
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elif sys.platform.startswith('linux'):
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if os.path.exists("/proc/meminfo"):
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with open("/proc/meminfo") as meminfo:
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memtotal_re = re.compile(r'^MemTotal:\s*(\d*)\s*kB')
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for line in meminfo:
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match = memtotal_re.match(line)
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if not match:
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continue
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# Allow 8Gb per link on Linux because Gold is quite memory hungry
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return max(1, int(match.group(1)) / (8 * (2 ** 20)))
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return 1
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elif sys.platform == 'darwin':
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try:
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avail_bytes = int(subprocess.check_output(['sysctl', '-n', 'hw.memsize']))
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# A static library debug build of Chromium's unit_tests takes ~2.7GB, so
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# 4GB per ld process allows for some more bloat.
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return max(1, avail_bytes / (4 * (2 ** 30))) # total / 4GB
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except Exception:
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return 1
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else:
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# TODO(scottmg): Implement this for other platforms.
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return 1
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print GetDefaultConcurrentLinks()
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