From 26cbb2ca13e522092a13983853c3bf91c298a762 Mon Sep 17 00:00:00 2001
From: Chris Hegarty <62058229+ChrisHegarty@users.noreply.github.com>
Date: Tue, 10 Dec 2024 15:51:05 +0000
Subject: [PATCH] Improve logging of native vector scorer - vec_caps (#118325)

This commit adds logging of the system's vector capability check, to help with diagnosing whether AVX2 or AVX 512 will be used.
---
 .../org/elasticsearch/nativeaccess/jdk/JdkVectorLibrary.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkVectorLibrary.java b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkVectorLibrary.java
index 2fccb27fa6e6c..3277cb8f8e6c7 100644
--- a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkVectorLibrary.java
+++ b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkVectorLibrary.java
@@ -9,6 +9,8 @@
 
 package org.elasticsearch.nativeaccess.jdk;
 
+import org.elasticsearch.logging.LogManager;
+import org.elasticsearch.logging.Logger;
 import org.elasticsearch.nativeaccess.VectorSimilarityFunctions;
 import org.elasticsearch.nativeaccess.lib.LoaderHelper;
 import org.elasticsearch.nativeaccess.lib.VectorLibrary;
@@ -25,6 +27,8 @@
 
 public final class JdkVectorLibrary implements VectorLibrary {
 
+    static final Logger logger = LogManager.getLogger(JdkVectorLibrary.class);
+
     static final MethodHandle dot7u$mh;
     static final MethodHandle sqr7u$mh;
 
@@ -36,6 +40,7 @@ public final class JdkVectorLibrary implements VectorLibrary {
 
         try {
             int caps = (int) vecCaps$mh.invokeExact();
+            logger.info("vec_caps=" + caps);
             if (caps != 0) {
                 if (caps == 2) {
                     dot7u$mh = downcallHandle(