kaijchen commented on code in PR #33325:
URL: https://github.com/apache/doris/pull/33325#discussion_r1580379559
##########
be/src/common/config.cpp:
##########
@@ -662,6 +662,12 @@ DEFINE_mInt64(storage_flood_stage_left_capacity_bytes,
"1073741824"); // 1GB
DEFINE_Int32(flush_thread_num_per_store, "6");
// number of thread for flushing memtable per store, for high priority load
task
DEFINE_Int32(high_priority_flush_thread_num_per_store, "6");
+// number of threads = min(flush_thread_num_per_store * num_store,
+// max_flush_thread_num_per_cpu * num_cpu)
+DEFINE_Int32(max_flush_thread_num_per_cpu, "4");
+// number of threads = min(high_priority_flush_thread_num_per_store *
num_store,
+// max_high_priority_flush_thread_num_per_cpu *
num_cpu)
+DEFINE_Int32(max_high_priority_flush_thread_num_per_cpu, "4");
Review Comment:
```suggestion
```
##########
be/src/common/config.h:
##########
@@ -715,6 +715,12 @@ DECLARE_mInt64(storage_flood_stage_left_capacity_bytes);
// 1GB
DECLARE_Int32(flush_thread_num_per_store);
// number of thread for flushing memtable per store, for high priority load
task
DECLARE_Int32(high_priority_flush_thread_num_per_store);
+// number of threads = min(flush_thread_num_per_store * num_store,
+// max_flush_thread_num_per_cpu * num_cpu)
+DECLARE_Int32(max_flush_thread_num_per_cpu);
+// number of threads = min(high_priority_flush_thread_num_per_store *
num_store,
+// max_high_priority_flush_thread_num_per_cpu *
num_cpu)
+DECLARE_Int32(max_high_priority_flush_thread_num_per_cpu);
Review Comment:
```suggestion
```
##########
be/src/olap/memtable_flush_executor.cpp:
##########
@@ -202,15 +202,19 @@ void
FlushToken::_flush_memtable(std::unique_ptr<MemTable> memtable_ptr, int32_t
void MemTableFlushExecutor::init(int num_disk) {
num_disk = std::max(1, num_disk);
- size_t min_threads = std::max(1, config::flush_thread_num_per_store);
- size_t max_threads = num_disk * min_threads;
+ int num_cpus = std::thread::hardware_concurrency();
+ int min_threads = std::max(1, config::flush_thread_num_per_store);
+ int max_threads = num_cpus == 0 ? num_disk * min_threads
+ : std::min(num_disk * min_threads,
+ num_cpus *
config::max_flush_thread_num_per_cpu);
static_cast<void>(ThreadPoolBuilder("MemTableFlushThreadPool")
.set_min_threads(min_threads)
.set_max_threads(max_threads)
.build(&_flush_pool));
min_threads = std::max(1,
config::high_priority_flush_thread_num_per_store);
- max_threads = num_disk * min_threads;
+ max_threads = std::min(num_disk * min_threads,
+ num_cpus *
config::max_high_priority_flush_thread_num_per_cpu);
Review Comment:
```suggestion
max_threads = num_cpus == 0 ? num_disk * min_threads
: std::min(num_disk * min_threads,
num_cpus *
config::max_flush_thread_num_per_cpu);
```
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