#631 - FAISS isn't compiled with O3 option

CHANGELOG.md

@@ -42,6 +42,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - \#599 - Build index log is incorrect
 - \#602 - Optimizer specify wrong gpu_id
 - \#606 - No log generated during building index with CPU
+- \#631 - FAISS isn't compiled with O3 option
 
 ## Feature
 - \#12 - Pure CPU version for Milvus

core/src/index/cmake/ThirdPartyPackagesCore.cmake

@@ -708,7 +708,7 @@ macro(build_faiss)
     set(FAISS_CONFIGURE_ARGS
             "--prefix=${FAISS_PREFIX}"
             "CFLAGS=${EP_C_FLAGS}"
-            "CXXFLAGS=${EP_CXX_FLAGS} -mavx2 -mf16c"
+            "CXXFLAGS=${EP_CXX_FLAGS} -mavx2 -mf16c -O3"
             --without-python)
 
     if (FAISS_WITH_MKL)