diff --git a/ompi/mca/rcache/rcache.h b/ompi/mca/rcache/rcache.h
index 75bd06b1a7..2c58478bd3 100644
--- a/ompi/mca/rcache/rcache.h
+++ b/ompi/mca/rcache/rcache.h
@@ -54,6 +54,8 @@ typedef int (*mca_rcache_base_module_delete_fn_t)(
 typedef int (*mca_rcache_base_module_clean_fn_t)(
         struct mca_rcache_base_module_t* rcache);
 
+typedef void (*mca_rcache_base_module_dump_range_fn_t)(
+        struct mca_rcache_base_module_t* rcache, unsigned char* addr, size_t size);
 
 /**
   * finalize
@@ -88,6 +90,7 @@ struct mca_rcache_base_module_t {
     mca_rcache_base_module_delete_fn_t rcache_delete;
     mca_rcache_base_module_clean_fn_t rcache_clean;
     mca_rcache_base_module_finalize_fn_t rcache_finalize;
+    mca_rcache_base_module_dump_range_fn_t rcache_dump_range;
     opal_mutex_t lock;
 };
 typedef struct mca_rcache_base_module_t mca_rcache_base_module_t;
diff --git a/ompi/mca/rcache/vma/rcache_vma.c b/ompi/mca/rcache/vma/rcache_vma.c
index edc68083df..f844d2b5d3 100644
--- a/ompi/mca/rcache/vma/rcache_vma.c
+++ b/ompi/mca/rcache/vma/rcache_vma.c
@@ -40,6 +40,7 @@ void mca_rcache_vma_module_init( mca_rcache_vma_module_t* rcache ) {
     rcache->base.rcache_delete = mca_rcache_vma_delete; 
     rcache->base.rcache_clean = mca_rcache_vma_clean; 
     rcache->base.rcache_finalize = mca_rcache_vma_finalize; 
+    rcache->base.rcache_dump_range = mca_rcache_vma_dump_range;
     OBJ_CONSTRUCT(&rcache->base.lock, opal_mutex_t);
     mca_rcache_vma_tree_init(rcache);
 }
@@ -171,3 +172,10 @@ int mca_rcache_vma_clean(struct mca_rcache_base_module_t* rcache)
 void mca_rcache_vma_finalize(struct mca_rcache_base_module_t* rcache)
 {
 }
+
+void mca_rcache_vma_dump_range(struct mca_rcache_base_module_t* rcache,
+                               unsigned char *base, size_t size)
+{
+    mca_rcache_vma_module_t *vma_rcache = (struct mca_rcache_vma_module_t*) rcache;
+    mca_rcache_vma_tree_dump_range(vma_rcache, base, size);
+}
diff --git a/ompi/mca/rcache/vma/rcache_vma.h b/ompi/mca/rcache/vma/rcache_vma.h
index 4b247db479..0a94759a99 100644
--- a/ompi/mca/rcache/vma/rcache_vma.h
+++ b/ompi/mca/rcache/vma/rcache_vma.h
@@ -82,6 +82,10 @@ void mca_rcache_vma_module_init(mca_rcache_vma_module_t *rcache);
 
 void mca_rcache_vma_finalize(struct mca_rcache_base_module_t*);
 
+void mca_rcache_vma_dump_range(struct mca_rcache_base_module_t *rcache,
+                               unsigned char* addr, size_t size);
+
+
 END_C_DECLS
 
 #endif /* MCA_RCACHE_VMA_H */
diff --git a/ompi/mca/rcache/vma/rcache_vma_tree.c b/ompi/mca/rcache/vma/rcache_vma_tree.c
index 9477a2089d..9d1496455b 100644
--- a/ompi/mca/rcache/vma/rcache_vma_tree.c
+++ b/ompi/mca/rcache/vma/rcache_vma_tree.c
@@ -532,3 +532,48 @@ int mca_rcache_vma_tree_delete(mca_rcache_vma_module_t* vma_rcache,
     }
     return 0;
 }
+
+/* Dump out rcache entries within a range of memory.  Useful for debugging. */
+void mca_rcache_vma_tree_dump_range(mca_rcache_vma_module_t *vma_rcache,
+                                    unsigned char *base, size_t size)
+{
+    unsigned char * bound = base + size -1;
+    mca_mpool_base_registration_t *reg;
+
+    if(opal_list_get_size(&vma_rcache->vma_list) == 0) {
+        opal_output(0, "rcache is empty");
+        return;
+    }
+
+    opal_output(0, "Dumping rcache entries");
+    do {
+        mca_rcache_vma_t *vma;
+        opal_list_item_t *item;
+        vma = (mca_rcache_vma_t*)
+            ompi_rb_tree_find_with(&vma_rcache->rb_tree, base,
+                mca_rcache_vma_tree_node_compare_closest);
+
+        if(NULL == vma) {
+            /* base is bigger than any registered memory */
+            break;
+        }
+
+        if(base < (unsigned char*)vma->start) {
+            base = (unsigned char*)vma->start;
+            continue;
+        }
+
+        opal_output(0, " vma: base=%p, bound=%p, size=%d", (void *)vma->start, (void *)vma->end,
+                    (int)(vma->end - vma->start + 1));
+        for(item = opal_list_get_first(&vma->reg_list);
+                item != opal_list_get_end(&vma->reg_list);
+                item = opal_list_get_next(item)) {
+            mca_rcache_vma_reg_list_item_t *vma_item;
+            vma_item = (mca_rcache_vma_reg_list_item_t*)item;
+            reg = vma_item->reg;
+            opal_output(0, "   reg: base=%p, bound=%p, alloc_base=%p, ref_count=%d, flags=0x%x",
+			reg->base, reg->bound, reg->alloc_base, reg->ref_count, reg->flags);
+        }
+        base = (unsigned char *)vma->end + 1;
+    } while(bound >= base);
+}
diff --git a/ompi/mca/rcache/vma/rcache_vma_tree.h b/ompi/mca/rcache/vma/rcache_vma_tree.h
index 16201f3dd6..750a0d5c25 100644
--- a/ompi/mca/rcache/vma/rcache_vma_tree.h
+++ b/ompi/mca/rcache/vma/rcache_vma_tree.h
@@ -99,5 +99,12 @@ int mca_rcache_vma_tree_delete(
  */
 void mca_rcache_vma_destroy(mca_rcache_vma_t *vma);
 
+/*
+ * Dump out the contents of the rcache for debugging.
+ */
+void mca_rcache_vma_tree_dump_range(mca_rcache_vma_module_t *vma_rcache,
+                                    unsigned char *base, size_t size);
+
+
 #endif /* MCA_RCACHE_VMA_TREE_H */