aa7bc7e0bb
Without the added preprocessor check, iOS device will be using the desktop logic to determine the number of thread. This put iPhone 8 and iPhone X to use 3 threads and all other iPhones after iPhone 5 to use a single thread. This CL added a preprocessor for WEBRTC_IOS to have it own thread number calculation logic. In which, the maximum number of thread is fetched from a field_trial and capped by the number of CPU available on the device. Bug: webrtc:10005 Change-Id: I8c6257fcbf85b07bc986b5f733dbabb3feee37f7 Reviewed-on: https://webrtc-review.googlesource.com/c/110941 Commit-Queue: Jiawei Ou <ouj@fb.com> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Reviewed-by: Magnus Flodman <mflodman@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25997}
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "system_wrappers/include/cpu_info.h"
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#if defined(WEBRTC_WIN)
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#include <windows.h>
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#elif defined(WEBRTC_LINUX)
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#include <unistd.h>
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#endif
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#if defined(WEBRTC_MAC)
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#include <sys/sysctl.h>
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#endif
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#include "rtc_base/logging.h"
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namespace internal {
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static int DetectNumberOfCores() {
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// We fall back on assuming a single core in case of errors.
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int number_of_cores = 1;
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#if defined(WEBRTC_WIN)
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SYSTEM_INFO si;
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GetNativeSystemInfo(&si);
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number_of_cores = static_cast<int>(si.dwNumberOfProcessors);
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#elif defined(WEBRTC_LINUX) || defined(WEBRTC_ANDROID)
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number_of_cores = static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
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#elif defined(WEBRTC_MAC) || defined(WEBRTC_IOS)
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int name[] = {CTL_HW, HW_AVAILCPU};
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size_t size = sizeof(number_of_cores);
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if (0 != sysctl(name, 2, &number_of_cores, &size, NULL, 0)) {
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RTC_LOG(LS_ERROR) << "Failed to get number of cores";
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number_of_cores = 1;
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}
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#else
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RTC_LOG(LS_ERROR) << "No function to get number of cores";
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#endif
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RTC_LOG(LS_INFO) << "Available number of cores: " << number_of_cores;
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return number_of_cores;
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}
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} // namespace internal
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namespace webrtc {
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uint32_t CpuInfo::DetectNumberOfCores() {
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// Statically cache the number of system cores available since if the process
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// is running in a sandbox, we may only be able to read the value once (before
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// the sandbox is initialized) and not thereafter.
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// For more information see crbug.com/176522.
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static uint32_t logical_cpus = 0;
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if (!logical_cpus)
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logical_cpus = static_cast<uint32_t>(internal::DetectNumberOfCores());
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return logical_cpus;
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}
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} // namespace webrtc
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