From c1bd16a55e1e229afe56b58f009a0dd1097ffce7 Mon Sep 17 00:00:00 2001
From: bugfixer <bugfixer@zilliz.com>
Date: Sun, 1 Dec 2019 01:40:11 +0000
Subject: [PATCH] #631 - FAISS isn't compiled with O3 option

---
 CHANGELOG.md                                      | 1 +
 core/src/index/cmake/ThirdPartyPackagesCore.cmake | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb082d27..c7739c5b 100644
--- a/CHANGELOG.md
+++ b/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
diff --git a/core/src/index/cmake/ThirdPartyPackagesCore.cmake b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
index 624f1f42..9c9187d2 100644
--- a/core/src/index/cmake/ThirdPartyPackagesCore.cmake
+++ b/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)
-- 
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