xinyiZzz commented on code in PR #14374:
URL: https://github.com/apache/doris/pull/14374#discussion_r1025088724
##########
be/src/common/daemon.cpp:
##########
@@ -74,28 +74,49 @@ void Daemon::tcmalloc_gc_thread() {
size_t tc_use_memory_min = MemInfo::mem_limit();
if (config::memory_mode == std::string("performance")) {
+ // a higher tc_use_memory_min to use memory as tcmalloc cache as much
as possible
tc_use_memory_min = std::max(tc_use_memory_min / 10 * 9,
tc_use_memory_min - (size_t)10 * 1024 *
1024 * 1024);
+ } else if (config::memory_mode == std::string("compact")) {
+ // a limited tc_use_memory_min to limit memory used as cache of
tcmalloc
+ tc_use_memory_min = std::min((size_t)10 * 1024 * 1024 * 1024,
tc_use_memory_min >> 1);
} else {
+ // a moderate tc_use_memory_min
tc_use_memory_min >>= 1;
}
- while (!_stop_background_threads_latch.wait_for(std::chrono::seconds(10)))
{
+ int32_t interval_seconds = 2;
+ while
(!_stop_background_threads_latch.wait_for(std::chrono::seconds(interval_seconds)))
{
size_t used_size = 0;
- size_t free_size = 0;
+ size_t alloc_size = 0;
+
MallocExtension::instance()->GetNumericProperty("generic.total_physical_bytes",
+ &alloc_size);
MallocExtension::instance()->GetNumericProperty("generic.current_allocated_bytes",
&used_size);
-
MallocExtension::instance()->GetNumericProperty("tcmalloc.pageheap_free_bytes",
&free_size);
- size_t alloc_size = used_size + free_size;
- LOG(INFO) << "tcmalloc.pageheap_free_bytes " << free_size
- << ", generic.current_allocated_bytes " << used_size << ",
tc_use_memory_min "
+
+ LOG(INFO) << "generic.current_allocated_bytes " << used_size
+ << ", generic.total_physical_bytes " << alloc_size << ",
tc_use_memory_min "
<< tc_use_memory_min;
if (alloc_size > tc_use_memory_min) {
- size_t max_free_size = alloc_size * 20 / 100;
- if (free_size > max_free_size) {
- MallocExtension::instance()->ReleaseToSystem(free_size -
max_free_size);
+ // Limit size of cache of tcmalloc to avoid oom.
+ // alloc_size > mem_limit: release memory aggressively because we
are reaching oom.
+ // alloc_size < mem_limit: limit cache size of tcmalloc under
used_size * 20%.
+ size_t max_free_size = 0;
+
+ if (MemInfo::mem_limit() > alloc_size) {
+ max_free_size = MemInfo::mem_limit() - alloc_size;
+ interval_seconds = 2;
+ } else {
+ interval_seconds = 1;
+ }
+
+ max_free_size = std::min(used_size * 20 / 100, max_free_size);
+ size_t free_size = alloc_size - used_size - max_free_size;
Review Comment:
It seems difficult to understand using `used_size` to calculate
`max_free_size`, and then to calculate `free_size`.
Directly free the percentage of `MemInfo::allocator_cache_mem()`. Seems to
be better understood.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org
For additional commands, e-mail: commits-h...@doris.apache.org
