Enhance MemoryStats to avoid the false sharing effect on the CPU cache (

vesoft-inc#2038)

* Enhance MemoryStats to avoid the false sharing effect on the CPU cache

* small rename

Co-authored-by: Sophie <84560950+Sophie-Xie@users.noreply.github.com>

Co-authored-by: kyle.cao <kyle.cao@vesoft.com>
Co-authored-by: Sophie <84560950+Sophie-Xie@users.noreply.github.com>

src/common/memory/MemoryTracker.h

@@ -11,6 +11,13 @@
 namespace nebula {
 namespace memory {
 
+constexpr size_t
+#if defined(__cpp_lib_hardware_interference_size)
+    CACHE_LINE_SIZE = hardware_destructive_interference_size;
+#else
+    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(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_;