b1d5f065db
By default Windows limits the number of MMCSS threads to 32. This can cause problems on modern systems with >= 32 cores, when Ardour uses many process and I/O threads. So far this is just a first step (query API)
97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
/*
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* Copyright (C) 2010-2013 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2013-2019 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef WAF_BUILD
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#include "libpbd-config.h"
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#endif
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#include <stdlib.h>
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#ifdef __linux__
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#include <unistd.h>
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#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#elif defined(PLATFORM_WINDOWS)
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#include <windows.h>
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#endif
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#include "pbd/cpus.h"
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#if defined(COMPILER_MSVC) && !defined(PTW32_VERSION)
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#include <ardourext/pthread.h> // Gets us 'PTW32_VERSION'
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#endif
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int32_t
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max_mmcss_threads_per_process ()
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{
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#ifdef PLATFORM_WINDOWS
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DWORD dwType = REG_DWORD;
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DWORD dwSize = 4;
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int32_t rv = 32;
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HKEY hKey;
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if (ERROR_SUCCESS == RegOpenKeyExA (HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows NT\\CurrentVersion\\Multimedia\\SystemProfile", 0, KEY_READ, &hKey)) {
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if (ERROR_SUCCESS == RegQueryValueExA (hKey, "MaxThreadsPerProcess", 0, &dwType, (LPBYTE)&rv, &dwSize)) {
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if (dwType == REG_DWORD && dwSize == 4) {
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return rv;
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}
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}
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}
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return 32;
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#else
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return INT32_MAX;
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#endif
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}
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uint32_t
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hardware_concurrency()
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{
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if (getenv("ARDOUR_CONCURRENCY")) {
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int c = atoi (getenv("ARDOUR_CONCURRENCY"));
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if (c > 0) {
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return c;
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}
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}
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#if defined(PTW32_VERSION) || defined(__hpux)
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return pthread_num_processors_np();
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#elif defined(__APPLE__)
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int count;
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size_t size=sizeof(count);
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# ifdef MIXBUS
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return sysctlbyname("hw.logicalcpu",&count,&size,NULL,0)?0:count;
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# else
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return sysctlbyname("hw.physicalcpu",&count,&size,NULL,0)?0:count;
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# endif
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#elif defined(__FreeBSD__)
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int count;
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size_t size=sizeof(count);
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return sysctlbyname("hw.ncpu",&count,&size,NULL,0)?0:count;
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#elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
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int const count=sysconf(_SC_NPROCESSORS_ONLN);
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return (count>0)?count:0;
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#elif defined(PLATFORM_WINDOWS)
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SYSTEM_INFO sys_info;
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GetSystemInfo( &sys_info );
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return sys_info.dwNumberOfProcessors;
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#else
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return 0;
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#endif
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}
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