diff --git a/include/ipc.h b/include/ipc.h
index 672ba7f..f440026 100644
--- a/include/ipc.h
+++ b/include/ipc.h
@@ -5,6 +5,8 @@
 #include "buffer.h"
 #include "shm.h"
 
+#include <string>
+
 namespace ipc {
 
 using handle_t = void*;
diff --git a/src/memory/alloc.h b/src/memory/alloc.h
index 63c20a5..a2a53fc 100644
--- a/src/memory/alloc.h
+++ b/src/memory/alloc.h
@@ -43,7 +43,8 @@ constexpr std::size_t aligned(std::size_t size, size_t alignment) noexcept {
 class scope_alloc_base {
 protected:
     struct block_t {
-        block_t* next_;
+        block_t   * next_;
+        std::size_t size_;
     } * list_ = nullptr;
 
     enum : std::size_t {
@@ -74,7 +75,7 @@ private:
         while (list_ != nullptr) {
             auto curr = list_;
             list_ = list_->next_;
-            alloc_.free(curr);
+            alloc_.free(curr, curr->size_);
         }
         // now list_ is nullptr
     }
@@ -103,8 +104,9 @@ public:
     }
 
     void* alloc(std::size_t size) {
-        auto curr = static_cast<block_t*>(alloc_.alloc(aligned_block_size + size));
+        auto curr = static_cast<block_t*>(alloc_.alloc(size += aligned_block_size));
         curr->next_ = list_;
+        curr->size_ = size;
         return (reinterpret_cast<byte_t*>(list_ = curr) + aligned_block_size);
     }
 };
@@ -151,9 +153,23 @@ public:
 };
 
 struct fixed_expand_policy {
+
+    enum : std::size_t {
+        base_size = sizeof(void*) * 1024 / 2
+    };
+
+    static std::size_t prev(std::size_t& e) {
+        if ((e /= 2) == 0) e = 1;
+        return e;
+    }
+
+    static std::size_t next(std::size_t& e) {
+        return e *= 2;
+    }
+
     template <std::size_t BlockSize>
-    IPC_CONSTEXPR_ static std::size_t next(std::size_t & e) {
-        return ipc::detail::max<std::size_t>(BlockSize, (sizeof(void*) * 1024) / 2) * (e *= 2);
+    static std::size_t next(std::size_t & e) {
+        return ipc::detail::max<std::size_t>(BlockSize, base_size) * next(e);
     }
 };
 
@@ -205,8 +221,9 @@ public:
     }
 
     void clear() {
+        ExpandP::prev(this->init_expand_);
+        this->cursor_ = nullptr;
         alloc_.~alloc_policy();
-        this->init(this->init_expand_);
     }
 
     void* alloc() {
diff --git a/src/memory/resource.h b/src/memory/resource.h
index 7208f2b..f20a413 100644
--- a/src/memory/resource.h
+++ b/src/memory/resource.h
@@ -35,14 +35,11 @@ struct chunk_mapping_policy {
 };
 
 template <typename AllocP>
-struct chunk_alloc_recoverer {
-public:
-    using alloc_policy = AllocP;
-
-    constexpr static void swap(chunk_alloc_recoverer &) {}
-    constexpr static void clear() {}
-    constexpr static void try_recover(alloc_policy &) {}
-    constexpr static void collect(alloc_policy &&) {}
+struct chunk_alloc_recoverer : default_alloc_recoverer<AllocP> {
+    void collect(alloc_policy && alc) {
+        alc.clear(); // recycle memory to the central heap (static_chunk_alloc)
+        default_alloc_recoverer<AllocP>::collect(std::move(alc));
+    }
 };
 
 } // namespace detail
diff --git a/test/test_circ.cpp b/test/test_circ.cpp
index 2e10e50..bdf6b7d 100644
--- a/test/test_circ.cpp
+++ b/test/test_circ.cpp
@@ -238,7 +238,7 @@ private slots:
     void test_prod_cons_1v3();
     void test_prod_cons_performance();
     void test_queue();
-} unit__;
+} /*unit__*/;
 
 #include "test_circ.moc"
 
diff --git a/test/test_mem.cpp b/test/test_mem.cpp
index 44d060f..88a81a9 100644
--- a/test/test_mem.cpp
+++ b/test/test_mem.cpp
@@ -172,9 +172,9 @@ struct test_performance<AllocT, ModeT, 1> {
 };
 
 void Unit::test_static() {
-    test_performance<ipc::mem::static_alloc, alloc_FIFO  , 8>::start();
-    test_performance<ipc::mem::static_alloc, alloc_LIFO  , 8>::start();
-    test_performance<ipc::mem::static_alloc, alloc_random, 8>::start();
+    //test_performance<ipc::mem::static_alloc, alloc_FIFO  , 8>::start();
+    //test_performance<ipc::mem::static_alloc, alloc_LIFO  , 8>::start();
+    //test_performance<ipc::mem::static_alloc, alloc_random, 8>::start();
 }
 
 void Unit::test_pool() {