| /* |
| * kmp_affinity.h -- header for affinity management |
| */ |
| |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef KMP_AFFINITY_H |
| #define KMP_AFFINITY_H |
| |
| #include "kmp.h" |
| #include "kmp_os.h" |
| |
| #if KMP_AFFINITY_SUPPORTED |
| #if KMP_USE_HWLOC |
| class KMPHwlocAffinity : public KMPAffinity { |
| public: |
| class Mask : public KMPAffinity::Mask { |
| hwloc_cpuset_t mask; |
| |
| public: |
| Mask() { |
| mask = hwloc_bitmap_alloc(); |
| this->zero(); |
| } |
| ~Mask() { hwloc_bitmap_free(mask); } |
| void set(int i) override { hwloc_bitmap_set(mask, i); } |
| bool is_set(int i) const override { return hwloc_bitmap_isset(mask, i); } |
| void clear(int i) override { hwloc_bitmap_clr(mask, i); } |
| void zero() override { hwloc_bitmap_zero(mask); } |
| void copy(const KMPAffinity::Mask *src) override { |
| const Mask *convert = static_cast<const Mask *>(src); |
| hwloc_bitmap_copy(mask, convert->mask); |
| } |
| void bitwise_and(const KMPAffinity::Mask *rhs) override { |
| const Mask *convert = static_cast<const Mask *>(rhs); |
| hwloc_bitmap_and(mask, mask, convert->mask); |
| } |
| void bitwise_or(const KMPAffinity::Mask *rhs) override { |
| const Mask *convert = static_cast<const Mask *>(rhs); |
| hwloc_bitmap_or(mask, mask, convert->mask); |
| } |
| void bitwise_not() override { hwloc_bitmap_not(mask, mask); } |
| int begin() const override { return hwloc_bitmap_first(mask); } |
| int end() const override { return -1; } |
| int next(int previous) const override { |
| return hwloc_bitmap_next(mask, previous); |
| } |
| int get_system_affinity(bool abort_on_error) override { |
| KMP_ASSERT2(KMP_AFFINITY_CAPABLE(), |
| "Illegal get affinity operation when not capable"); |
| int retval = |
| hwloc_get_cpubind(__kmp_hwloc_topology, mask, HWLOC_CPUBIND_THREAD); |
| if (retval >= 0) { |
| return 0; |
| } |
| int error = errno; |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FatalSysError), KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| int set_system_affinity(bool abort_on_error) const override { |
| KMP_ASSERT2(KMP_AFFINITY_CAPABLE(), |
| "Illegal get affinity operation when not capable"); |
| int retval = |
| hwloc_set_cpubind(__kmp_hwloc_topology, mask, HWLOC_CPUBIND_THREAD); |
| if (retval >= 0) { |
| return 0; |
| } |
| int error = errno; |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FatalSysError), KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| int get_proc_group() const override { |
| int group = -1; |
| #if KMP_OS_WINDOWS |
| if (__kmp_num_proc_groups == 1) { |
| return 1; |
| } |
| for (int i = 0; i < __kmp_num_proc_groups; i++) { |
| // On windows, the long type is always 32 bits |
| unsigned long first_32_bits = hwloc_bitmap_to_ith_ulong(mask, i * 2); |
| unsigned long second_32_bits = |
| hwloc_bitmap_to_ith_ulong(mask, i * 2 + 1); |
| if (first_32_bits == 0 && second_32_bits == 0) { |
| continue; |
| } |
| if (group >= 0) { |
| return -1; |
| } |
| group = i; |
| } |
| #endif /* KMP_OS_WINDOWS */ |
| return group; |
| } |
| }; |
| void determine_capable(const char *var) override { |
| const hwloc_topology_support *topology_support; |
| if (__kmp_hwloc_topology == NULL) { |
| if (hwloc_topology_init(&__kmp_hwloc_topology) < 0) { |
| __kmp_hwloc_error = TRUE; |
| if (__kmp_affinity_verbose) |
| KMP_WARNING(AffHwlocErrorOccurred, var, "hwloc_topology_init()"); |
| } |
| if (hwloc_topology_load(__kmp_hwloc_topology) < 0) { |
| __kmp_hwloc_error = TRUE; |
| if (__kmp_affinity_verbose) |
| KMP_WARNING(AffHwlocErrorOccurred, var, "hwloc_topology_load()"); |
| } |
| } |
| topology_support = hwloc_topology_get_support(__kmp_hwloc_topology); |
| // Is the system capable of setting/getting this thread's affinity? |
| // Also, is topology discovery possible? (pu indicates ability to discover |
| // processing units). And finally, were there no errors when calling any |
| // hwloc_* API functions? |
| if (topology_support && topology_support->cpubind->set_thisthread_cpubind && |
| topology_support->cpubind->get_thisthread_cpubind && |
| topology_support->discovery->pu && !__kmp_hwloc_error) { |
| // enables affinity according to KMP_AFFINITY_CAPABLE() macro |
| KMP_AFFINITY_ENABLE(TRUE); |
| } else { |
| // indicate that hwloc didn't work and disable affinity |
| __kmp_hwloc_error = TRUE; |
| KMP_AFFINITY_DISABLE(); |
| } |
| } |
| void bind_thread(int which) override { |
| KMP_ASSERT2(KMP_AFFINITY_CAPABLE(), |
| "Illegal set affinity operation when not capable"); |
| KMPAffinity::Mask *mask; |
| KMP_CPU_ALLOC_ON_STACK(mask); |
| KMP_CPU_ZERO(mask); |
| KMP_CPU_SET(which, mask); |
| __kmp_set_system_affinity(mask, TRUE); |
| KMP_CPU_FREE_FROM_STACK(mask); |
| } |
| KMPAffinity::Mask *allocate_mask() override { return new Mask(); } |
| void deallocate_mask(KMPAffinity::Mask *m) override { delete m; } |
| KMPAffinity::Mask *allocate_mask_array(int num) override { |
| return new Mask[num]; |
| } |
| void deallocate_mask_array(KMPAffinity::Mask *array) override { |
| Mask *hwloc_array = static_cast<Mask *>(array); |
| delete[] hwloc_array; |
| } |
| KMPAffinity::Mask *index_mask_array(KMPAffinity::Mask *array, |
| int index) override { |
| Mask *hwloc_array = static_cast<Mask *>(array); |
| return &(hwloc_array[index]); |
| } |
| api_type get_api_type() const override { return HWLOC; } |
| }; |
| #endif /* KMP_USE_HWLOC */ |
| |
| #if KMP_OS_LINUX |
| /* On some of the older OS's that we build on, these constants aren't present |
| in <asm/unistd.h> #included from <sys.syscall.h>. They must be the same on |
| all systems of the same arch where they are defined, and they cannot change. |
| stone forever. */ |
| #include <sys/syscall.h> |
| #if KMP_ARCH_X86 || KMP_ARCH_ARM |
| #ifndef __NR_sched_setaffinity |
| #define __NR_sched_setaffinity 241 |
| #elif __NR_sched_setaffinity != 241 |
| #error Wrong code for setaffinity system call. |
| #endif /* __NR_sched_setaffinity */ |
| #ifndef __NR_sched_getaffinity |
| #define __NR_sched_getaffinity 242 |
| #elif __NR_sched_getaffinity != 242 |
| #error Wrong code for getaffinity system call. |
| #endif /* __NR_sched_getaffinity */ |
| #elif KMP_ARCH_AARCH64 |
| #ifndef __NR_sched_setaffinity |
| #define __NR_sched_setaffinity 122 |
| #elif __NR_sched_setaffinity != 122 |
| #error Wrong code for setaffinity system call. |
| #endif /* __NR_sched_setaffinity */ |
| #ifndef __NR_sched_getaffinity |
| #define __NR_sched_getaffinity 123 |
| #elif __NR_sched_getaffinity != 123 |
| #error Wrong code for getaffinity system call. |
| #endif /* __NR_sched_getaffinity */ |
| #elif KMP_ARCH_X86_64 |
| #ifndef __NR_sched_setaffinity |
| #define __NR_sched_setaffinity 203 |
| #elif __NR_sched_setaffinity != 203 |
| #error Wrong code for setaffinity system call. |
| #endif /* __NR_sched_setaffinity */ |
| #ifndef __NR_sched_getaffinity |
| #define __NR_sched_getaffinity 204 |
| #elif __NR_sched_getaffinity != 204 |
| #error Wrong code for getaffinity system call. |
| #endif /* __NR_sched_getaffinity */ |
| #elif KMP_ARCH_PPC64 |
| #ifndef __NR_sched_setaffinity |
| #define __NR_sched_setaffinity 222 |
| #elif __NR_sched_setaffinity != 222 |
| #error Wrong code for setaffinity system call. |
| #endif /* __NR_sched_setaffinity */ |
| #ifndef __NR_sched_getaffinity |
| #define __NR_sched_getaffinity 223 |
| #elif __NR_sched_getaffinity != 223 |
| #error Wrong code for getaffinity system call. |
| #endif /* __NR_sched_getaffinity */ |
| #elif KMP_ARCH_MIPS |
| #ifndef __NR_sched_setaffinity |
| #define __NR_sched_setaffinity 4239 |
| #elif __NR_sched_setaffinity != 4239 |
| #error Wrong code for setaffinity system call. |
| #endif /* __NR_sched_setaffinity */ |
| #ifndef __NR_sched_getaffinity |
| #define __NR_sched_getaffinity 4240 |
| #elif __NR_sched_getaffinity != 4240 |
| #error Wrong code for getaffinity system call. |
| #endif /* __NR_sched_getaffinity */ |
| #elif KMP_ARCH_MIPS64 |
| #ifndef __NR_sched_setaffinity |
| #define __NR_sched_setaffinity 5195 |
| #elif __NR_sched_setaffinity != 5195 |
| #error Wrong code for setaffinity system call. |
| #endif /* __NR_sched_setaffinity */ |
| #ifndef __NR_sched_getaffinity |
| #define __NR_sched_getaffinity 5196 |
| #elif __NR_sched_getaffinity != 5196 |
| #error Wrong code for getaffinity system call. |
| #endif /* __NR_sched_getaffinity */ |
| #error Unknown or unsupported architecture |
| #endif /* KMP_ARCH_* */ |
| class KMPNativeAffinity : public KMPAffinity { |
| class Mask : public KMPAffinity::Mask { |
| typedef unsigned char mask_t; |
| static const int BITS_PER_MASK_T = sizeof(mask_t) * CHAR_BIT; |
| |
| public: |
| mask_t *mask; |
| Mask() { mask = (mask_t *)__kmp_allocate(__kmp_affin_mask_size); } |
| ~Mask() { |
| if (mask) |
| __kmp_free(mask); |
| } |
| void set(int i) override { |
| mask[i / BITS_PER_MASK_T] |= ((mask_t)1 << (i % BITS_PER_MASK_T)); |
| } |
| bool is_set(int i) const override { |
| return (mask[i / BITS_PER_MASK_T] & ((mask_t)1 << (i % BITS_PER_MASK_T))); |
| } |
| void clear(int i) override { |
| mask[i / BITS_PER_MASK_T] &= ~((mask_t)1 << (i % BITS_PER_MASK_T)); |
| } |
| void zero() override { |
| for (size_t i = 0; i < __kmp_affin_mask_size; ++i) |
| mask[i] = 0; |
| } |
| void copy(const KMPAffinity::Mask *src) override { |
| const Mask *convert = static_cast<const Mask *>(src); |
| for (size_t i = 0; i < __kmp_affin_mask_size; ++i) |
| mask[i] = convert->mask[i]; |
| } |
| void bitwise_and(const KMPAffinity::Mask *rhs) override { |
| const Mask *convert = static_cast<const Mask *>(rhs); |
| for (size_t i = 0; i < __kmp_affin_mask_size; ++i) |
| mask[i] &= convert->mask[i]; |
| } |
| void bitwise_or(const KMPAffinity::Mask *rhs) override { |
| const Mask *convert = static_cast<const Mask *>(rhs); |
| for (size_t i = 0; i < __kmp_affin_mask_size; ++i) |
| mask[i] |= convert->mask[i]; |
| } |
| void bitwise_not() override { |
| for (size_t i = 0; i < __kmp_affin_mask_size; ++i) |
| mask[i] = ~(mask[i]); |
| } |
| int begin() const override { |
| int retval = 0; |
| while (retval < end() && !is_set(retval)) |
| ++retval; |
| return retval; |
| } |
| int end() const override { return __kmp_affin_mask_size * BITS_PER_MASK_T; } |
| int next(int previous) const override { |
| int retval = previous + 1; |
| while (retval < end() && !is_set(retval)) |
| ++retval; |
| return retval; |
| } |
| int get_system_affinity(bool abort_on_error) override { |
| KMP_ASSERT2(KMP_AFFINITY_CAPABLE(), |
| "Illegal get affinity operation when not capable"); |
| int retval = |
| syscall(__NR_sched_getaffinity, 0, __kmp_affin_mask_size, mask); |
| if (retval >= 0) { |
| return 0; |
| } |
| int error = errno; |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FatalSysError), KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| int set_system_affinity(bool abort_on_error) const override { |
| KMP_ASSERT2(KMP_AFFINITY_CAPABLE(), |
| "Illegal get affinity operation when not capable"); |
| int retval = |
| syscall(__NR_sched_setaffinity, 0, __kmp_affin_mask_size, mask); |
| if (retval >= 0) { |
| return 0; |
| } |
| int error = errno; |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FatalSysError), KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| }; |
| void determine_capable(const char *env_var) override { |
| __kmp_affinity_determine_capable(env_var); |
| } |
| void bind_thread(int which) override { __kmp_affinity_bind_thread(which); } |
| KMPAffinity::Mask *allocate_mask() override { |
| KMPNativeAffinity::Mask *retval = new Mask(); |
| return retval; |
| } |
| void deallocate_mask(KMPAffinity::Mask *m) override { |
| KMPNativeAffinity::Mask *native_mask = |
| static_cast<KMPNativeAffinity::Mask *>(m); |
| delete native_mask; |
| } |
| KMPAffinity::Mask *allocate_mask_array(int num) override { |
| return new Mask[num]; |
| } |
| void deallocate_mask_array(KMPAffinity::Mask *array) override { |
| Mask *linux_array = static_cast<Mask *>(array); |
| delete[] linux_array; |
| } |
| KMPAffinity::Mask *index_mask_array(KMPAffinity::Mask *array, |
| int index) override { |
| Mask *linux_array = static_cast<Mask *>(array); |
| return &(linux_array[index]); |
| } |
| api_type get_api_type() const override { return NATIVE_OS; } |
| }; |
| #endif /* KMP_OS_LINUX */ |
| |
| #if KMP_OS_WINDOWS |
| class KMPNativeAffinity : public KMPAffinity { |
| class Mask : public KMPAffinity::Mask { |
| typedef ULONG_PTR mask_t; |
| static const int BITS_PER_MASK_T = sizeof(mask_t) * CHAR_BIT; |
| mask_t *mask; |
| |
| public: |
| Mask() { |
| mask = (mask_t *)__kmp_allocate(sizeof(mask_t) * __kmp_num_proc_groups); |
| } |
| ~Mask() { |
| if (mask) |
| __kmp_free(mask); |
| } |
| void set(int i) override { |
| mask[i / BITS_PER_MASK_T] |= ((mask_t)1 << (i % BITS_PER_MASK_T)); |
| } |
| bool is_set(int i) const override { |
| return (mask[i / BITS_PER_MASK_T] & ((mask_t)1 << (i % BITS_PER_MASK_T))); |
| } |
| void clear(int i) override { |
| mask[i / BITS_PER_MASK_T] &= ~((mask_t)1 << (i % BITS_PER_MASK_T)); |
| } |
| void zero() override { |
| for (int i = 0; i < __kmp_num_proc_groups; ++i) |
| mask[i] = 0; |
| } |
| void copy(const KMPAffinity::Mask *src) override { |
| const Mask *convert = static_cast<const Mask *>(src); |
| for (int i = 0; i < __kmp_num_proc_groups; ++i) |
| mask[i] = convert->mask[i]; |
| } |
| void bitwise_and(const KMPAffinity::Mask *rhs) override { |
| const Mask *convert = static_cast<const Mask *>(rhs); |
| for (int i = 0; i < __kmp_num_proc_groups; ++i) |
| mask[i] &= convert->mask[i]; |
| } |
| void bitwise_or(const KMPAffinity::Mask *rhs) override { |
| const Mask *convert = static_cast<const Mask *>(rhs); |
| for (int i = 0; i < __kmp_num_proc_groups; ++i) |
| mask[i] |= convert->mask[i]; |
| } |
| void bitwise_not() override { |
| for (int i = 0; i < __kmp_num_proc_groups; ++i) |
| mask[i] = ~(mask[i]); |
| } |
| int begin() const override { |
| int retval = 0; |
| while (retval < end() && !is_set(retval)) |
| ++retval; |
| return retval; |
| } |
| int end() const override { return __kmp_num_proc_groups * BITS_PER_MASK_T; } |
| int next(int previous) const override { |
| int retval = previous + 1; |
| while (retval < end() && !is_set(retval)) |
| ++retval; |
| return retval; |
| } |
| int set_system_affinity(bool abort_on_error) const override { |
| if (__kmp_num_proc_groups > 1) { |
| // Check for a valid mask. |
| GROUP_AFFINITY ga; |
| int group = get_proc_group(); |
| if (group < 0) { |
| if (abort_on_error) { |
| KMP_FATAL(AffinityInvalidMask, "kmp_set_affinity"); |
| } |
| return -1; |
| } |
| // Transform the bit vector into a GROUP_AFFINITY struct |
| // and make the system call to set affinity. |
| ga.Group = group; |
| ga.Mask = mask[group]; |
| ga.Reserved[0] = ga.Reserved[1] = ga.Reserved[2] = 0; |
| |
| KMP_DEBUG_ASSERT(__kmp_SetThreadGroupAffinity != NULL); |
| if (__kmp_SetThreadGroupAffinity(GetCurrentThread(), &ga, NULL) == 0) { |
| DWORD error = GetLastError(); |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(CantSetThreadAffMask), KMP_ERR(error), |
| __kmp_msg_null); |
| } |
| return error; |
| } |
| } else { |
| if (!SetThreadAffinityMask(GetCurrentThread(), *mask)) { |
| DWORD error = GetLastError(); |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(CantSetThreadAffMask), KMP_ERR(error), |
| __kmp_msg_null); |
| } |
| return error; |
| } |
| } |
| return 0; |
| } |
| int get_system_affinity(bool abort_on_error) override { |
| if (__kmp_num_proc_groups > 1) { |
| this->zero(); |
| GROUP_AFFINITY ga; |
| KMP_DEBUG_ASSERT(__kmp_GetThreadGroupAffinity != NULL); |
| if (__kmp_GetThreadGroupAffinity(GetCurrentThread(), &ga) == 0) { |
| DWORD error = GetLastError(); |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FunctionError, "GetThreadGroupAffinity()"), |
| KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| if ((ga.Group < 0) || (ga.Group > __kmp_num_proc_groups) || |
| (ga.Mask == 0)) { |
| return -1; |
| } |
| mask[ga.Group] = ga.Mask; |
| } else { |
| mask_t newMask, sysMask, retval; |
| if (!GetProcessAffinityMask(GetCurrentProcess(), &newMask, &sysMask)) { |
| DWORD error = GetLastError(); |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FunctionError, "GetProcessAffinityMask()"), |
| KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| retval = SetThreadAffinityMask(GetCurrentThread(), newMask); |
| if (!retval) { |
| DWORD error = GetLastError(); |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FunctionError, "SetThreadAffinityMask()"), |
| KMP_ERR(error), __kmp_msg_null); |
| } |
| return error; |
| } |
| newMask = SetThreadAffinityMask(GetCurrentThread(), retval); |
| if (!newMask) { |
| DWORD error = GetLastError(); |
| if (abort_on_error) { |
| __kmp_fatal(KMP_MSG(FunctionError, "SetThreadAffinityMask()"), |
| KMP_ERR(error), __kmp_msg_null); |
| } |
| } |
| *mask = retval; |
| } |
| return 0; |
| } |
| int get_proc_group() const override { |
| int group = -1; |
| if (__kmp_num_proc_groups == 1) { |
| return 1; |
| } |
| for (int i = 0; i < __kmp_num_proc_groups; i++) { |
| if (mask[i] == 0) |
| continue; |
| if (group >= 0) |
| return -1; |
| group = i; |
| } |
| return group; |
| } |
| }; |
| void determine_capable(const char *env_var) override { |
| __kmp_affinity_determine_capable(env_var); |
| } |
| void bind_thread(int which) override { __kmp_affinity_bind_thread(which); } |
| KMPAffinity::Mask *allocate_mask() override { return new Mask(); } |
| void deallocate_mask(KMPAffinity::Mask *m) override { delete m; } |
| KMPAffinity::Mask *allocate_mask_array(int num) override { |
| return new Mask[num]; |
| } |
| void deallocate_mask_array(KMPAffinity::Mask *array) override { |
| Mask *windows_array = static_cast<Mask *>(array); |
| delete[] windows_array; |
| } |
| KMPAffinity::Mask *index_mask_array(KMPAffinity::Mask *array, |
| int index) override { |
| Mask *windows_array = static_cast<Mask *>(array); |
| return &(windows_array[index]); |
| } |
| api_type get_api_type() const override { return NATIVE_OS; } |
| }; |
| #endif /* KMP_OS_WINDOWS */ |
| #endif /* KMP_AFFINITY_SUPPORTED */ |
| |
| class Address { |
| public: |
| static const unsigned maxDepth = 32; |
| unsigned labels[maxDepth]; |
| unsigned childNums[maxDepth]; |
| unsigned depth; |
| unsigned leader; |
| Address(unsigned _depth) : depth(_depth), leader(FALSE) {} |
| Address &operator=(const Address &b) { |
| depth = b.depth; |
| for (unsigned i = 0; i < depth; i++) { |
| labels[i] = b.labels[i]; |
| childNums[i] = b.childNums[i]; |
| } |
| leader = FALSE; |
| return *this; |
| } |
| bool operator==(const Address &b) const { |
| if (depth != b.depth) |
| return false; |
| for (unsigned i = 0; i < depth; i++) |
| if (labels[i] != b.labels[i]) |
| return false; |
| return true; |
| } |
| bool isClose(const Address &b, int level) const { |
| if (depth != b.depth) |
| return false; |
| if ((unsigned)level >= depth) |
| return true; |
| for (unsigned i = 0; i < (depth - level); i++) |
| if (labels[i] != b.labels[i]) |
| return false; |
| return true; |
| } |
| bool operator!=(const Address &b) const { return !operator==(b); } |
| void print() const { |
| unsigned i; |
| printf("Depth: %u --- ", depth); |
| for (i = 0; i < depth; i++) { |
| printf("%u ", labels[i]); |
| } |
| } |
| }; |
| |
| class AddrUnsPair { |
| public: |
| Address first; |
| unsigned second; |
| AddrUnsPair(Address _first, unsigned _second) |
| : first(_first), second(_second) {} |
| AddrUnsPair &operator=(const AddrUnsPair &b) { |
| first = b.first; |
| second = b.second; |
| return *this; |
| } |
| void print() const { |
| printf("first = "); |
| first.print(); |
| printf(" --- second = %u", second); |
| } |
| bool operator==(const AddrUnsPair &b) const { |
| if (first != b.first) |
| return false; |
| if (second != b.second) |
| return false; |
| return true; |
| } |
| bool operator!=(const AddrUnsPair &b) const { return !operator==(b); } |
| }; |
| |
| static int __kmp_affinity_cmp_Address_labels(const void *a, const void *b) { |
| const Address *aa = &(((const AddrUnsPair *)a)->first); |
| const Address *bb = &(((const AddrUnsPair *)b)->first); |
| unsigned depth = aa->depth; |
| unsigned i; |
| KMP_DEBUG_ASSERT(depth == bb->depth); |
| for (i = 0; i < depth; i++) { |
| if (aa->labels[i] < bb->labels[i]) |
| return -1; |
| if (aa->labels[i] > bb->labels[i]) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* A structure for holding machine-specific hierarchy info to be computed once |
| at init. This structure represents a mapping of threads to the actual machine |
| hierarchy, or to our best guess at what the hierarchy might be, for the |
| purpose of performing an efficient barrier. In the worst case, when there is |
| no machine hierarchy information, it produces a tree suitable for a barrier, |
| similar to the tree used in the hyper barrier. */ |
| class hierarchy_info { |
| public: |
| /* Good default values for number of leaves and branching factor, given no |
| affinity information. Behaves a bit like hyper barrier. */ |
| static const kmp_uint32 maxLeaves = 4; |
| static const kmp_uint32 minBranch = 4; |
| /** Number of levels in the hierarchy. Typical levels are threads/core, |
| cores/package or socket, packages/node, nodes/machine, etc. We don't want |
| to get specific with nomenclature. When the machine is oversubscribed we |
| add levels to duplicate the hierarchy, doubling the thread capacity of the |
| hierarchy each time we add a level. */ |
| kmp_uint32 maxLevels; |
| |
| /** This is specifically the depth of the machine configuration hierarchy, in |
| terms of the number of levels along the longest path from root to any |
| leaf. It corresponds to the number of entries in numPerLevel if we exclude |
| all but one trailing 1. */ |
| kmp_uint32 depth; |
| kmp_uint32 base_num_threads; |
| enum init_status { initialized = 0, not_initialized = 1, initializing = 2 }; |
| volatile kmp_int8 uninitialized; // 0=initialized, 1=not initialized, |
| // 2=initialization in progress |
| volatile kmp_int8 resizing; // 0=not resizing, 1=resizing |
| |
| /** Level 0 corresponds to leaves. numPerLevel[i] is the number of children |
| the parent of a node at level i has. For example, if we have a machine |
| with 4 packages, 4 cores/package and 2 HT per core, then numPerLevel = |
| {2, 4, 4, 1, 1}. All empty levels are set to 1. */ |
| kmp_uint32 *numPerLevel; |
| kmp_uint32 *skipPerLevel; |
| |
| void deriveLevels(AddrUnsPair *adr2os, int num_addrs) { |
| int hier_depth = adr2os[0].first.depth; |
| int level = 0; |
| for (int i = hier_depth - 1; i >= 0; --i) { |
| int max = -1; |
| for (int j = 0; j < num_addrs; ++j) { |
| int next = adr2os[j].first.childNums[i]; |
| if (next > max) |
| max = next; |
| } |
| numPerLevel[level] = max + 1; |
| ++level; |
| } |
| } |
| |
| hierarchy_info() |
| : maxLevels(7), depth(1), uninitialized(not_initialized), resizing(0) {} |
| |
| void fini() { |
| if (!uninitialized && numPerLevel) { |
| __kmp_free(numPerLevel); |
| numPerLevel = NULL; |
| uninitialized = not_initialized; |
| } |
| } |
| |
| void init(AddrUnsPair *adr2os, int num_addrs) { |
| kmp_int8 bool_result = KMP_COMPARE_AND_STORE_ACQ8( |
| &uninitialized, not_initialized, initializing); |
| if (bool_result == 0) { // Wait for initialization |
| while (TCR_1(uninitialized) != initialized) |
| KMP_CPU_PAUSE(); |
| return; |
| } |
| KMP_DEBUG_ASSERT(bool_result == 1); |
| |
| /* Added explicit initialization of the data fields here to prevent usage of |
| dirty value observed when static library is re-initialized multiple times |
| (e.g. when non-OpenMP thread repeatedly launches/joins thread that uses |
| OpenMP). */ |
| depth = 1; |
| resizing = 0; |
| maxLevels = 7; |
| numPerLevel = |
| (kmp_uint32 *)__kmp_allocate(maxLevels * 2 * sizeof(kmp_uint32)); |
| skipPerLevel = &(numPerLevel[maxLevels]); |
| for (kmp_uint32 i = 0; i < maxLevels; |
| ++i) { // init numPerLevel[*] to 1 item per level |
| numPerLevel[i] = 1; |
| skipPerLevel[i] = 1; |
| } |
| |
| // Sort table by physical ID |
| if (adr2os) { |
| qsort(adr2os, num_addrs, sizeof(*adr2os), |
| __kmp_affinity_cmp_Address_labels); |
| deriveLevels(adr2os, num_addrs); |
| } else { |
| numPerLevel[0] = maxLeaves; |
| numPerLevel[1] = num_addrs / maxLeaves; |
| if (num_addrs % maxLeaves) |
| numPerLevel[1]++; |
| } |
| |
| base_num_threads = num_addrs; |
| for (int i = maxLevels - 1; i >= 0; |
| --i) // count non-empty levels to get depth |
| if (numPerLevel[i] != 1 || depth > 1) // only count one top-level '1' |
| depth++; |
| |
| kmp_uint32 branch = minBranch; |
| if (numPerLevel[0] == 1) |
| branch = num_addrs / maxLeaves; |
| if (branch < minBranch) |
| branch = minBranch; |
| for (kmp_uint32 d = 0; d < depth - 1; ++d) { // optimize hierarchy width |
| while (numPerLevel[d] > branch || |
| (d == 0 && numPerLevel[d] > maxLeaves)) { // max 4 on level 0! |
| if (numPerLevel[d] & 1) |
| numPerLevel[d]++; |
| numPerLevel[d] = numPerLevel[d] >> 1; |
| if (numPerLevel[d + 1] == 1) |
| depth++; |
| numPerLevel[d + 1] = numPerLevel[d + 1] << 1; |
| } |
| if (numPerLevel[0] == 1) { |
| branch = branch >> 1; |
| if (branch < 4) |
| branch = minBranch; |
| } |
| } |
| |
| for (kmp_uint32 i = 1; i < depth; ++i) |
| skipPerLevel[i] = numPerLevel[i - 1] * skipPerLevel[i - 1]; |
| // Fill in hierarchy in the case of oversubscription |
| for (kmp_uint32 i = depth; i < maxLevels; ++i) |
| skipPerLevel[i] = 2 * skipPerLevel[i - 1]; |
| |
| uninitialized = initialized; // One writer |
| } |
| |
| // Resize the hierarchy if nproc changes to something larger than before |
| void resize(kmp_uint32 nproc) { |
| kmp_int8 bool_result = KMP_COMPARE_AND_STORE_ACQ8(&resizing, 0, 1); |
| while (bool_result == 0) { // someone else is trying to resize |
| KMP_CPU_PAUSE(); |
| if (nproc <= base_num_threads) // happy with other thread's resize |
| return; |
| else // try to resize |
| bool_result = KMP_COMPARE_AND_STORE_ACQ8(&resizing, 0, 1); |
| } |
| KMP_DEBUG_ASSERT(bool_result != 0); |
| if (nproc <= base_num_threads) |
| return; // happy with other thread's resize |
| |
| // Calculate new maxLevels |
| kmp_uint32 old_sz = skipPerLevel[depth - 1]; |
| kmp_uint32 incs = 0, old_maxLevels = maxLevels; |
| // First see if old maxLevels is enough to contain new size |
| for (kmp_uint32 i = depth; i < maxLevels && nproc > old_sz; ++i) { |
| skipPerLevel[i] = 2 * skipPerLevel[i - 1]; |
| numPerLevel[i - 1] *= 2; |
| old_sz *= 2; |
| depth++; |
| } |
| if (nproc > old_sz) { // Not enough space, need to expand hierarchy |
| while (nproc > old_sz) { |
| old_sz *= 2; |
| incs++; |
| depth++; |
| } |
| maxLevels += incs; |
| |
| // Resize arrays |
| kmp_uint32 *old_numPerLevel = numPerLevel; |
| kmp_uint32 *old_skipPerLevel = skipPerLevel; |
| numPerLevel = skipPerLevel = NULL; |
| numPerLevel = |
| (kmp_uint32 *)__kmp_allocate(maxLevels * 2 * sizeof(kmp_uint32)); |
| skipPerLevel = &(numPerLevel[maxLevels]); |
| |
| // Copy old elements from old arrays |
| for (kmp_uint32 i = 0; i < old_maxLevels; |
| ++i) { // init numPerLevel[*] to 1 item per level |
| numPerLevel[i] = old_numPerLevel[i]; |
| skipPerLevel[i] = old_skipPerLevel[i]; |
| } |
| |
| // Init new elements in arrays to 1 |
| for (kmp_uint32 i = old_maxLevels; i < maxLevels; |
| ++i) { // init numPerLevel[*] to 1 item per level |
| numPerLevel[i] = 1; |
| skipPerLevel[i] = 1; |
| } |
| |
| // Free old arrays |
| __kmp_free(old_numPerLevel); |
| } |
| |
| // Fill in oversubscription levels of hierarchy |
| for (kmp_uint32 i = old_maxLevels; i < maxLevels; ++i) |
| skipPerLevel[i] = 2 * skipPerLevel[i - 1]; |
| |
| base_num_threads = nproc; |
| resizing = 0; // One writer |
| } |
| }; |
| #endif // KMP_AFFINITY_H |
