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Do not create extra thread in PipelineExecutor if num_threads is 1.

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This commit is contained in:
Nikolai Kochetov 2020-01-01 14:18:24 +03:00
parent 3f35d143b3
commit faf118fb15
1 changed files with 22 additions and 16 deletions
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38
dbms/src/Processors/Executors/PipelineExecutor.cpp
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@ -720,29 +720,35 @@ void PipelineExecutor::executeImpl(size_t num_threads)
}
}
for (size_t i = 0; i < num_threads; ++i)
if (num_threads > 1)
{
threads.emplace_back([this, thread_group, thread_num = i, num_threads]
for (size_t i = 0; i < num_threads; ++i)
{
/// ThreadStatus thread_status;
threads.emplace_back([this, thread_group, thread_num = i, num_threads]
{
/// ThreadStatus thread_status;
setThreadName("QueryPipelineEx");
setThreadName("QueryPipelineEx");
if (thread_group)
CurrentThread::attachTo(thread_group);
if (thread_group)
CurrentThread::attachTo(thread_group);
SCOPE_EXIT(
if (thread_group)
CurrentThread::detachQueryIfNotDetached();
);
SCOPE_EXIT(
if (thread_group)
CurrentThread::detachQueryIfNotDetached();
);
executeSingleThread(thread_num, num_threads);
});
executeSingleThread(thread_num, num_threads);
});
}
for (auto & thread : threads)
if (thread.joinable())
thread.join();
}
for (auto & thread : threads)
if (thread.joinable())
thread.join();
else
executeSingleThread(0, num_threads);
finished_flag = true;
}