From 735a88798d8e8c54a32ae6d273adc7fe205d7c6e Mon Sep 17 00:00:00 2001
From: d-netto <diogonetto.dcn@gmail.com>
Date: Sun, 21 Jan 2024 10:14:12 -0300
Subject: [PATCH] place work-stealing queue indices on different cache lines to
 avoid false-sharing

---
 src/work-stealing-queue.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/work-stealing-queue.h b/src/work-stealing-queue.h
index 38429e02886e9..084e421fd58b3 100644
--- a/src/work-stealing-queue.h
+++ b/src/work-stealing-queue.h
@@ -36,7 +36,8 @@ static inline ws_array_t *create_ws_array(size_t capacity, int32_t eltsz) JL_NOT
 
 typedef struct {
     _Atomic(int64_t) top;
-    _Atomic(int64_t) bottom;
+    char _padding[128 - sizeof(int64_t)];
+    _Atomic(int64_t) bottom; // put on a separate cache line. conservatively estimate cache line size as 128 bytes
     _Atomic(ws_array_t *) array;
 } ws_queue_t;