Change max batch to one

src/thread_pipeline.hpp

@@ -11,6 +11,10 @@
 #include <utility>
 #include <vector>
 
+#if defined(__x86_64__) || defined(_M_X64)
+#include <immintrin.h>
+#endif
+
 // Wait strategies for controlling thread blocking behavior when no work is
 // available
 enum class WaitStrategy {
@@ -151,6 +155,9 @@ uint32_t calculate_safe_len(
                   if (push != thread.local_pops) {
                     goto dont_wait;
                   }
+#if defined(__x86_64__) || defined(_M_X64)
+                  _mm_pause();
+#endif
                 }
                 pushes.wait(push, std::memory_order_relaxed);
               dont_wait:;