1# Copyright 2016 The Chromium Authors 2# Use of this source code is governed by a BSD-style license that can be 3# found in the LICENSE file. 4 5# This file should only be imported from files that define toolchains. 6# There's no way to enforce this exactly, but all toolchains are processed 7# in the context of the default_toolchain, so we can at least check for that. 8assert(current_toolchain == default_toolchain) 9 10import("//build/config/android/config.gni") 11import("//build/config/apple/symbols.gni") 12import("//build/config/chromeos/ui_mode.gni") 13import("//build/config/compiler/compiler.gni") 14import("//build/config/coverage/coverage.gni") 15import("//build/config/sanitizers/sanitizers.gni") 16import("//build/toolchain/toolchain.gni") 17 18declare_args() { 19 # Limit the number of concurrent links; we often want to run fewer 20 # links at once than we do compiles, because linking is memory-intensive. 21 # The default to use varies by platform and by the amount of memory 22 # available, so we call out to a script to get the right value. 23 concurrent_links = -1 24} 25 26if (concurrent_links == -1) { 27 if (use_thin_lto) { 28 _args = [ "--reserve_mem_gb=10" ] 29 if (use_goma_thin_lto) { 30 _args += [ "--thin-lto=goma" ] 31 } else { 32 _args += [ "--thin-lto=local" ] 33 } 34 if (is_win) { 35 # Based on measurements of linking chrome.dll and chrome_child.dll, plus 36 # a little padding to account for future growth. 37 _args += [ "--mem_per_link_gb=45" ] 38 } else { 39 _args += [ "--mem_per_link_gb=20" ] 40 } 41 } else if ((use_clang_coverage && 42 # When coverage_instrumentation_input_file is not empty it means 43 # we're only instrumenting changed files and not using a lot of 44 # memory. Likewise, when it's empty we're building everything with 45 # coverage, which requires more memory. 46 coverage_instrumentation_input_file == "") || 47 use_sanitizer_coverage || use_fuzzing_engine) { 48 # Full sanitizer coverage instrumentation increases linker memory consumption 49 # significantly. 50 _args = [ "--mem_per_link_gb=16" ] 51 } else if (is_win && symbol_level == 1 && !is_debug && is_component_build) { 52 _args = [ "--mem_per_link_gb=3" ] 53 } else if (is_win) { 54 _args = [ "--mem_per_link_gb=6" ] 55 } else if (is_mac) { 56 if (enable_dsyms) { 57 _args = [ "--mem_per_link_gb=12" ] 58 } else { 59 _args = [ "--mem_per_link_gb=4" ] 60 } 61 } else if (is_android && !is_component_build && symbol_level == 2) { 62 # Full debug symbols require large memory for link. 63 _args = [ "--mem_per_link_gb=25" ] 64 } else if (is_android && !is_debug && !using_sanitizer && symbol_level < 2) { 65 if (symbol_level == 1) { 66 _args = [ "--mem_per_link_gb=6" ] 67 } else { 68 _args = [ "--mem_per_link_gb=4" ] 69 } 70 } else if ((is_linux || is_chromeos_lacros) && symbol_level == 0) { 71 # Memory consumption on link without debug symbols is low on linux. 72 _args = [ "--mem_per_link_gb=3" ] 73 } else if (current_os == "zos") { 74 _args = [ "--mem_per_link_gb=1" ] 75 } else if (is_fuchsia) { 76 # TODO(crbug.com/1347159): This was defaulting to 8GB. The number of 77 # linker instances to run in parallel is calculated by diviging 78 # the available memory by this value. On a 32GB machine with 79 # roughly 29GB of available memory, this would cause three instances 80 # to run. This started running out of memory and thrashing. This change 81 # addresses that issue to get the SDk rollers running again but 82 # could be optimized (maybe to 12GB or for different configs like 83 # component build). 84 _args = [ "--mem_per_link_gb=16" ] 85 } else { 86 _args = [] 87 } 88 89 # For Android builds, we also need to be wary of: 90 # * ProGuard / R8 91 # * Android Lint 92 # These both have a peak usage of < 2GB, but that is still large enough for 93 # them to need to use a pool since they both typically happen at the 94 # same time as linking. 95 if (is_android) { 96 _args += [ "--secondary_mem_per_link=2" ] 97 } 98 99 # TODO(crbug.com/617429) Pass more build configuration info to the script 100 # so that we can compute better values. 101 _command_dict = exec_script("get_concurrent_links.py", _args, "scope") 102 103 concurrent_links = _command_dict.primary_pool_size 104 concurrent_links_logs = _command_dict.explanation 105 106 if (_command_dict.secondary_pool_size >= concurrent_links) { 107 # Have R8 / Lint share the link pool unless we would safely get more 108 # concurrency out of using a separate one. 109 # On low-RAM machines, this allows an apk's native library to link at the 110 # same time as its java is optimized with R8. 111 java_cmd_pool_size = _command_dict.secondary_pool_size 112 } 113} else { 114 assert(!use_thin_lto, "can't explicitly set concurrent_links with thinlto") 115 concurrent_links_logs = 116 [ "concurrent_links set by GN arg (value=$concurrent_links)" ] 117} 118