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5f923cd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | // Copyright 2025 The ODML Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <pthread.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <algorithm>
#include <memory>
#include <ostream>
#include <set>
#include <string>
#include <utility>
#include "absl/base/nullability.h" // from @com_google_absl
#include "absl/log/absl_log.h" // from @com_google_absl
#include "absl/status/status.h" // from @com_google_absl
#include "absl/status/statusor.h" // from @com_google_absl
#include "absl/strings/str_cat.h" // from @com_google_absl
#include "absl/strings/str_join.h" // from @com_google_absl
#include "runtime/framework/thread_options.h"
#include "runtime/framework/threadpool.h"
#include "runtime/framework/worker_thread.h"
namespace litert::lm {
namespace {
// Create a thread name from the given prefix and thread id.
// - thread_id is not portable
// - the 16-byte limit is Linux-specific
// - the std::thread implementation has a copy of this but doesn't use it
// - why do we even need the thread id in the name? any thread list should show
// the id too.
std::string CreateThreadName(const std::string& prefix, int thread_id) {
std::string name = absl::StrCat(prefix, "/", thread_id);
// 16 is the limit allowed by `pthread_setname_np`, including
// the terminating null byte ('\0')
constexpr size_t kMaxThreadNameLength = 15;
name.resize(std::min(name.length(), kMaxThreadNameLength));
return name;
}
class WorkerThreadPthread : public WorkerThread {
public:
WorkerThreadPthread(ThreadPool* absl_nonnull pool,
const std::string& name_prefix);
// Starts the thread and reports the status.
absl::Status Start();
private:
absl::Status JoinImpl() override;
static void* ThreadBody(void* arg);
pthread_t thread_;
};
WorkerThreadPthread::WorkerThreadPthread(ThreadPool* absl_nonnull pool,
const std::string& name_prefix)
: WorkerThread(pool, name_prefix) {}
absl::Status WorkerThreadPthread::Start() {
int res = pthread_create(&thread_, nullptr, ThreadBody, this);
if (res == 0) {
return absl::OkStatus();
}
return absl::ErrnoToStatus(
res, absl::StrCat("pthread_create failed for pool ", name_prefix_, ": ",
strerror(res)));
}
absl::Status WorkerThreadPthread::JoinImpl() {
int res = pthread_join(thread_, nullptr);
if (res == 0) {
return absl::OkStatus();
}
return absl::ErrnoToStatus(
res, absl::StrCat("pthread_join failed for pool ", name_prefix_, ": ",
strerror(res)));
}
void* WorkerThreadPthread::ThreadBody(void* arg) {
auto thread = reinterpret_cast<WorkerThreadPthread*>(arg);
int nice_priority_level =
thread->pool_.thread_options().nice_priority_level();
const std::set<int> selected_cpus = thread->pool_.thread_options().cpu_set();
#if defined(__linux__)
const std::string name =
CreateThreadName(thread->name_prefix_, syscall(SYS_gettid));
if (nice_priority_level != 0) {
if (nice(nice_priority_level) != -1 || errno == 0) {
ABSL_LOG(INFO) << "Changed the nice priority level by "
<< nice_priority_level;
} else {
ABSL_LOG(ERROR) << "Error : " << strerror(errno) << std::endl
<< "Could not change the nice priority level by "
<< nice_priority_level;
}
}
if (!selected_cpus.empty()) {
cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
for (const int cpu : selected_cpus) {
CPU_SET(cpu, &cpu_set);
}
if (sched_setaffinity(syscall(SYS_gettid), sizeof(cpu_set_t), &cpu_set) !=
-1 ||
errno == 0) {
ABSL_LOG(INFO) << "Pinned the thread pool executor to processor "
<< absl::StrJoin(selected_cpus, ", processor ") << ".";
} else {
ABSL_LOG(ERROR) << "Error : " << strerror(errno) << std::endl
<< "Failed to set processor affinity. Ignore processor "
"affinity setting for now.";
}
}
int error = pthread_setname_np(pthread_self(), name.c_str());
if (error != 0) {
ABSL_LOG(ERROR) << "Error : " << strerror(error) << std::endl
<< "Failed to set name for thread: " << name;
}
#else
const std::string name = CreateThreadName(thread->name_prefix_, 0);
if (nice_priority_level != 0 || !selected_cpus.empty()) {
ABSL_LOG(ERROR) << "Thread priority and processor affinity feature aren't "
"supported on the current platform.";
}
#if __APPLE__
int error = pthread_setname_np(name.c_str());
if (error != 0) {
ABSL_LOG(ERROR) << "Error : " << strerror(error) << std::endl
<< "Failed to set name for thread: " << name;
}
#endif // __APPLE__
#endif // __linux__
thread->RunWorker();
return nullptr;
}
} // namespace
absl::StatusOr<std::unique_ptr<WorkerThread>> WorkerThread::Create(
ThreadPool* absl_nonnull pool, const std::string& name_prefix) {
auto worker = std::make_unique<WorkerThreadPthread>(pool, name_prefix);
auto status = worker->Start();
if (!status.ok()) {
return status;
}
return std::move(worker);
}
} // namespace litert::lm
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