diff --git a/Grid/allocator/MemoryManager.h b/Grid/allocator/MemoryManager.h
index aac13aee..25c5b5f5 100644
--- a/Grid/allocator/MemoryManager.h
+++ b/Grid/allocator/MemoryManager.h
@@ -34,8 +34,6 @@ NAMESPACE_BEGIN(Grid);
 
 // Move control to configure.ac and Config.h?
 
-#define ALLOCATION_CACHE
-#define GRID_ALLOC_ALIGN (2*1024*1024)
 #define GRID_ALLOC_SMALL_LIMIT (4096)
 
 /*Pinning pages is costly*/
diff --git a/Grid/threads/Accelerator.h b/Grid/threads/Accelerator.h
index 5f5cd5fe..6232aea8 100644
--- a/Grid/threads/Accelerator.h
+++ b/Grid/threads/Accelerator.h
@@ -361,7 +361,7 @@ inline void acceleratorMemSet(void *base,int value,size_t bytes) { hipMemset(bas
 //////////////////////////////////////////////
 // CPU Target - No accelerator just thread instead
 //////////////////////////////////////////////
-#define GRID_ALLOC_ALIGN (2*1024*1024) // 2MB aligned 
+
 #if ( (!defined(GRID_SYCL)) && (!defined(GRID_CUDA)) && (!defined(GRID_HIP)) )
 
 #undef GRID_SIMT
diff --git a/configure.ac b/configure.ac
index 5b22309d..4d16d776 100644
--- a/configure.ac
+++ b/configure.ac
@@ -491,6 +491,28 @@ AM_CFLAGS="$SIMD_FLAGS $AM_CFLAGS"
 ###### PRECISION ALWAYS DOUBLE
 AC_DEFINE([GRID_DEFAULT_PRECISION_DOUBLE],[1],[GRID_DEFAULT_PRECISION is DOUBLE] )
 
+#########################################################
+######################  GRID ALLOCATOR ALIGNMENT ##
+#########################################################
+AC_ARG_ENABLE([alloc-align],[AC_HELP_STRING([--enable-alloc-align=2MB|4k],
+              [Alignment in bytes of GRID Allocator ])],[ac_ALLOC_ALIGN=${enable_alloc_align}],[ac_ALLOC_ALIGN=2MB])
+case ${ac_ALLOC_ALIGN} in
+    4k)
+     AC_DEFINE([GRID_ALLOC_ALIGN],[(4096)],[GRID_ALLOC_ALIGN]);;
+    2MB)
+     AC_DEFINE([GRID_ALLOC_ALIGN],[(2*1024*1024)],[GRID_ALLOC_ALIGN]);;
+    *);;
+esac
+
+AC_ARG_ENABLE([alloc-cache],[AC_HELP_STRING([--enable-alloc-cache ],
+              [Cache a pool of recent "frees" to reuse])],[ac_ALLOC_CACHE=${enable_alloc_cache}],[ac_ALLOC_CACHE=yes])
+case ${ac_ALLOC_CACHE} in
+    yes)
+     AC_DEFINE([ALLOCATION_CACHE],[1],[ALLOCATION_CACHE]);;
+    *);;
+esac
+
+
 #########################################################
 ######################  set GPU device to rank in node ##
 #########################################################