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Enable affinity only for multiple threads.

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This commit is contained in:
Nikolai Kochetov 2020-01-01 21:42:15 +03:00
parent faf118fb15
commit cc67ab1107
1 changed files with 9 additions and 7 deletions
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16
dbms/src/Processors/Executors/PipelineExecutor.cpp
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@ -501,13 +501,15 @@ void PipelineExecutor::executeSingleThread(size_t thread_num, size_t num_threads
#if !defined(__APPLE__) && !defined(__FreeBSD__)
/// Specify CPU core for thread if can.
/// It may reduce the number of context swithches.
/*
cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
CPU_SET(thread_num, &cpu_set);
if (sched_setaffinity(0, sizeof(cpu_set_t), &cpu_set) == -1)
LOG_TRACE(log, "Cannot set affinity for thread " << num_threads);
*/
if (num_threads > 1)
{
cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
CPU_SET(thread_num, &cpu_set);
if (sched_setaffinity(0, sizeof(cpu_set_t), &cpu_set) == -1)
LOG_TRACE(log, "Cannot set affinity for thread " << num_threads);
}
#endif
// UInt64 total_time_ns = 0;