OK my last commit was ... kind of wrong. It only worked if the element_size

was smaller than the CACHE_LINE_SIZE. Here is the version that works.

In fact this works on 2 steps. First we set the element size to something
multiple of the desired alignment. Then when we allocate memory, we compute
the total size, and we will align each of the elements (we allocate
multiple of them every time) to the CACHE_LINE_SIZE.

This commit was SVN r10479.

ompi/class/ompi_free_list.c

@@ -104,10 +104,9 @@ int ompi_free_list_init(
     int num_elements_per_alloc,
     mca_mpool_base_module_t* mpool)
 {
-    if( elem_size % CACHE_LINE_SIZE )
     flist->fl_elem_size = elem_size;
-    else {
-        flist->fl_elem_size = (elem_size + CACHE_LINE_SIZE) % CACHE_LINE_SIZE;
+    if( elem_size % CACHE_LINE_SIZE ) {
+        flist->fl_elem_size += CACHE_LINE_SIZE - (elem_size % CACHE_LINE_SIZE);
     }
     flist->fl_elem_class = elem_class;
     flist->fl_max_to_alloc = max_elements_to_alloc;