From db7201c5926fa217b61f3f34adad3978a1c4442f Mon Sep 17 00:00:00 2001
From: "kyle.cao" <kyle.cao@vesoft.com>
Date: Wed, 28 Dec 2022 16:17:23 +0800
Subject: [PATCH] Enhance MemoryStats to avoid the false sharing effect on the
 CPU cache

---
 src/common/memory/MemoryTracker.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/common/memory/MemoryTracker.h b/src/common/memory/MemoryTracker.h
index 08b8ec7ad56..10022d0596d 100644
--- a/src/common/memory/MemoryTracker.h
+++ b/src/common/memory/MemoryTracker.h
@@ -11,6 +11,13 @@
 namespace nebula {
 namespace memory {
 
+constexpr size_t
+#if defined(__cpp_lib_hardware_interference_size)
+    L1_CACHE_LINE_SIZE = hardware_destructive_interference_size;
+#else
+    L1_CACHE_LINE_SIZE = 64;
+#endif
+
 // Memory stats for each thread.
 struct ThreadMemoryStats {
   ThreadMemoryStats();
@@ -114,7 +121,7 @@ class MemoryStats {
 
  private:
   // Global
-  int64_t limit_{std::numeric_limits<int64_t>::max()};
+  alignas(L1_CACHE_LINE_SIZE) int64_t limit_{std::numeric_limits<int64_t>::max()};
   std::atomic<int64_t> used_{0};
   // Thread Local
   static thread_local ThreadMemoryStats threadMemoryStats_;