diff --git a/src/sample/tcell/fib.tcell b/src/sample/tcell/fib.tcell
index a5b8962..7775163 100644
--- a/src/sample/tcell/fib.tcell
+++ b/src/sample/tcell/fib.tcell
@@ -103,11 +103,11 @@
   (csym::fprintf stderr "time: %lf~%"  (csym::elapsed-time tp)))
 
 (def (task-receiver fib)
-    ;;(csym::fprintf stderr "receive %d~%" this.n)
+    ;; (csym::fprintf stderr "receive %d~%" this.n)
     )
 
 (def (task-sender fib)
-    ;;(csym::fprintf stderr "send %d~%" this.n)
+    ;; (csym::fprintf stderr "send %d~%" this.n)
     )
 
 (def (rslt-sender fib)
@@ -132,5 +132,6 @@
           (%if* USE-PROBGUARD
             (= PROBABILITY (csym::my-probability (- n 2))))
           (= this.n (- n 2)))
-         (:get (= s2 this.r))))
+         (:get 
+         (= s2 this.r))))
       (return (+ s1 s2)))))
diff --git a/src/sample/tcell/grav.tcell b/src/sample/tcell/grav.tcell
index eb58861..7f41900 100644
--- a/src/sample/tcell/grav.tcell
+++ b/src/sample/tcell/grav.tcell
@@ -53,26 +53,30 @@
              (* 0.000001
                 (- (fref (aref tp 1) tv-usec)
                    (fref (aref tp 0) tv-usec))))))
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;a
 
 (def (task gravity)
   (def f (array double 3))   ; result
   (def rf (array double 3))  ; 小さい値を蓄積してく場所
-  (def minx int :in)
-  (def miny int :in)
-  (def minz int :in)
-  (def maxx int :in)
-  (def maxy int :in)
-  (def maxz int :in)
+  (def minx int )
+  (def miny int )
+  (def minz int )
+  (def maxx int )
+  (def maxy int )
+  (def maxz int )
   (def cur (array double 3))  ; 入力座標：ここへの重力ベクトルを計算
   ;;(def dummy (array char 4000))
   )
   
 (def (task-sender gravity)
-  (csym::send-doubles this.cur 3))
+  (csym::send-bytes (cast (ptr void) (ptr this.minx)) (- (sizeof this) (- (cast (ptr char)(ptr this.minx)) (cast (ptr char)(ptr this)))))
+  )
+
+;; sizeof (this) - ((char*)&this.minx - (char*)&this))
 
 (def (task-receiver gravity)
-  (csym::recv-doubles this.cur 3))
+  (csym::recv-bytes (cast (ptr void) (ptr this.minx)) (- (sizeof this) (- (cast (ptr char)(ptr this.minx)) (cast (ptr char)(ptr this)))))
+  )
 
 (def (rslt-sender gravity)
   (csym::send-doubles this.f 3))
diff --git a/src/sample/tcell/lu.tcell b/src/sample/tcell/lu.tcell
index 178369e..9833cae 100644
--- a/src/sample/tcell/lu.tcell
+++ b/src/sample/tcell/lu.tcell
@@ -357,31 +357,31 @@
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-(def (csym::input-mat a n1 n2 nx) (csym::fn void (ptr double) int int int)
-  (decl i int)
-  (def swp int)
-  (= swp (csym::recv-binary-header 0 0))
-  (for ((= i 0) (< i n1) (inc i))
-    (csym::recv-double-seq (+ a (* i nx)) n2))
-  (csym::recv-binary-terminator)
-  (if swp
-      (for ((= i 0) (< i n1) (inc i))
-        (csym::swap-doubles (+ a (* i nx)) n2))))
-
-(def (csym::output-mat a n1 n2 nx) (fn void (ptr double) int int int)
-  (def i int)
-  (csym::send-binary-header (sizeof double) (* n1 n2))
-  (for ((= i 0) (< i n1) (inc i))
-    (csym::send-double-seq (+ a (* i nx)) n2))
-  (csym::send-binary-terminator))
-
-#+comment                               ; easy but less efficient implementation
+;; (def (csym::input-mat a n1 n2 nx) (csym::fn void (ptr double) int int int)
+;;   (decl i int)
+;;   (def swp int)
+;;   (= swp (csym::recv-binary-header 0 0))
+;;   (for ((= i 0) (< i n1) (inc i))
+;;     (csym::recv-double-seq (+ a (* i nx)) n2))
+;;   (csym::recv-binary-terminator)
+;;   (if swp
+;;       (for ((= i 0) (< i n1) (inc i))
+;;         (csym::swap-doubles (+ a (* i nx)) n2))))
+
+;; (def (csym::output-mat a n1 n2 nx) (fn void (ptr double) int int int)
+;;   (def i int)
+;;   (csym::send-binary-header (sizeof double) (* n1 n2))
+;;   (for ((= i 0) (< i n1) (inc i))
+;;     (csym::send-double-seq (+ a (* i nx)) n2))
+;;   (csym::send-binary-terminator))
+
+;; #+comment                               ; easy but less efficient implementation
 (def (csym::input-mat a n1 n2 nx) (csym::fn void (ptr double) int int int)
   (decl i int)
   (for ((= i 0) (< i n1) (inc i))
     (csym::recv-doubles (+ a (* i nx)) n2)))
 
-#+comment                               ; easy but less efficient implementation
+;; #+comment                               ; easy but less efficient implementation
 (def (csym::output-mat a n1 n2 nx) (fn void (ptr double) int int int)
   (def i int)
   (for ((= i 0) (< i n1) (inc i))
@@ -389,39 +389,63 @@
 
 (def (csym::input-mat-l a n1 nx) (fn void (ptr double) int int)
   (decl i int)
-  (decl swp int)
-  (= swp (csym::recv-binary-header 0 0))
   (for ((= i 0) (< i n1) (inc i)) 
-    (csym::recv-double-seq (+ a (* i nx)) (+ i 1)))
-  (csym::recv-binary-terminator)
-  (if swp
-      (for ((= i 0) (< i n1) (inc i))
-        (csym::swap-doubles (+ a (* i nx)) (+ i 1)))))
+    (csym::recv-doubles (+ a (* i nx)) (+ i 1)))
+  )
 
 (def (csym::output-mat-l a n1 nx) (fn void (ptr double) int int)
   (decl i int)
-  (csym::send-binary-header (sizeof double) (/ (* n1 (+ n1 1)) 2))
   (for ((= i 0) (< i n1) (inc i))
-    (csym::send-double-seq (+ a (* i nx)) (+ i 1)))
-  (csym::send-binary-terminator))
+    (csym::send-doubles (+ a (* i nx)) (+ i 1)))
+  )
 
 (def (csym::input-mat-u a n1 nx) (fn void (ptr double) int int)
   (decl i int)
-  (decl swp int)
-  (= swp (csym::recv-binary-header 0 0))
   (for ((= i 0) (< i n1) (inc i))
-    (csym::recv-double-seq (+ a (* i nx) i 1) (- n1 i 1)))
-  (csym::recv-binary-terminator)
-  (if swp
-      (for ((= i 0) (< i n1) (inc i))
-        (csym::swap-doubles (+ a (* i nx) i 1) (- n1 i 1)))))
+    (csym::recv-doubles (+ a (* i nx) i 1) (- n1 i 1)))
+  )
 
 (def (csym::output-mat-u a n1 nx) (csym::fn void (ptr double) int int)
   (decl i int) 
-  (csym::send-binary-header (sizeof double) (/ (* n1 (- n1 1)) 2))
   (for ((= i 0) (< i n1) (inc i)) 
-    (csym::send-double-seq (+ a (* i nx) i 1) (- n1 i 1)))
-  (csym::send-binary-terminator))
+    (csym::send-doubles (+ a (* i nx) i 1) (- n1 i 1)))
+  )
+
+;; (def (csym::input-mat-l a n1 nx) (fn void (ptr double) int int)
+;;   (decl i int)
+;;   (decl swp int)
+;;   (= swp (csym::recv-binary-header 0 0))
+;;   (for ((= i 0) (< i n1) (inc i)) 
+;;     (csym::recv-double-seq (+ a (* i nx)) (+ i 1)))
+;;   (csym::recv-binary-terminator)
+;;   (if swp
+;;       (for ((= i 0) (< i n1) (inc i))
+;;         (csym::swap-doubles (+ a (* i nx)) (+ i 1)))))
+
+;; (def (csym::output-mat-l a n1 nx) (fn void (ptr double) int int)
+;;   (decl i int)
+;;   (csym::send-binary-header (sizeof double) (/ (* n1 (+ n1 1)) 2))
+;;   (for ((= i 0) (< i n1) (inc i))
+;;     (csym::send-double-seq (+ a (* i nx)) (+ i 1)))
+;;   (csym::send-binary-terminator))
+
+;; (def (csym::input-mat-u a n1 nx) (fn void (ptr double) int int)
+;;   (decl i int)
+;;   (decl swp int)
+;;   (= swp (csym::recv-binary-header 0 0))
+;;   (for ((= i 0) (< i n1) (inc i))
+;;     (csym::recv-double-seq (+ a (* i nx) i 1) (- n1 i 1)))
+;;   (csym::recv-binary-terminator)
+;;   (if swp
+;;       (for ((= i 0) (< i n1) (inc i))
+;;         (csym::swap-doubles (+ a (* i nx) i 1) (- n1 i 1)))))
+
+;; (def (csym::output-mat-u a n1 nx) (csym::fn void (ptr double) int int)
+;;   (decl i int) 
+;;   (csym::send-binary-header (sizeof double) (/ (* n1 (- n1 1)) 2))
+;;   (for ((= i 0) (< i n1) (inc i)) 
+;;     (csym::send-double-seq (+ a (* i nx) i 1) (- n1 i 1)))
+;;   (csym::send-binary-terminator))
 
 (def (csym::zero-mat a n1 n2 nx) (fn void (ptr double) int int int)
   (decl i int)
diff --git a/src/sample/tcell/nq.tcell b/src/sample/tcell/nq.tcell
index 886de50..3e0c071 100644
--- a/src/sample/tcell/nq.tcell
+++ b/src/sample/tcell/nq.tcell
@@ -66,31 +66,15 @@
   )
 
 (def (task-sender nqueens)
-  (def i int 0)
   (if (>= this.k 0)
       (begin
-       (csym::send-int this.i1)
-       (csym::send-int this.i2)
-       (for ((= i 0) (< i this.n) (inc i))
-            (csym::send-int (aref this.a i)))
-       (for ((= i 0) (< i (- (* 2 this.n) 1)) (inc i))
-            (csym::send-int (aref this.lb i)))
-       (for ((= i 0) (< i (- (* 2 this.n) 1)) (inc i))
-            (csym::send-int (aref this.rb i)))))
-  )
+       (csym::send-bytes (cast (ptr void) (ptr this)) (sizeof this))
+  )))
 
 (def (task-receiver nqueens)
-  (def i int 0)
   (if (>= this.k 0)
       (begin
-       (= this.i1 (csym::recv-int))
-       (= this.i2 (csym::recv-int))
-       (for ((= i 0) (< i this.n) (inc i))
-            (= (aref this.a i) (csym::recv-int)))
-       (for ((= i 0) (< i (- (* 2 this.n) 1)) (inc i))
-            (= (aref this.lb i) (csym::recv-int)))
-       (for ((= i 0) (< i (- (* 2 this.n) 1)) (inc i))
-            (= (aref this.rb i) (csym::recv-int)))
+       (csym::recv-bytes (cast (ptr void) (ptr this)) (sizeof this))
   )))
 
 
diff --git a/src/sample/tcell/pen6x17.tcell b/src/sample/tcell/pen6x17.tcell
index 93c7e69..31639a1 100644
--- a/src/sample/tcell/pen6x17.tcell
+++ b/src/sample/tcell/pen6x17.tcell
@@ -56,16 +56,24 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 (def (task pentomino)
   (def r int :out)
-  (def k int :in)
-  (def i0 int :in)
-  (def i1 int :in)
-  (def i2 int :in)
-  (def maxp int :in)  ; number of pieces
-  (def maxk int :in)  ; the last empty cell
-  (def a (array int ASIZE) :in)
-  (def b (array int BSIZE) :in))
+  (def k int )
+  (def i0 int )
+  (def i1 int )
+  (def i2 int )
+  (def maxp int )  ; number of pieces
+  (def maxk int )  ; the last empty cell
+  (def a (array int ASIZE))
+  (def b (array int BSIZE)))
 
-;; task/rslt-sender/receiver = default
+(def (task-sender pentomino)
+  (csym::send-bytes (cast (ptr void) (ptr this)) (sizeof this))
+  )
+
+(def (task-receiver pentomino)
+  (csym::recv-bytes (cast (ptr void) (ptr this)) (sizeof this))
+  )
+
+;; rslt-sender/receiver = default
 
 (decl (search k j0 j1 j2 maxp maxk tsk) (wfn int int int int int int int (ptr (struct pentomino))))
 (def (task-body pentomino)
diff --git a/src/sample/tcell/sendrecv.c b/src/sample/tcell/sendrecv.c
index a6e4ef4..c62c09f 100644
--- a/src/sample/tcell/sendrecv.c
+++ b/src/sample/tcell/sendrecv.c
@@ -70,15 +70,37 @@ int recv_int(void)
 /**/
 void send_long(long n)
 {
-    char buf[16];
-    snprintf (buf, 16, "%ld\n", n);
-    send_string (buf, sv_socket);
+    if(RANK < 0)
+        {
+            char buf[16];
+            snprintf (buf, 16, "%ld\n", n);
+            send_string (buf, sv_socket);
+        }
+    else
+        {
+            send_longs (&n, 1);
+        }
+    // char buf[16];
+    // snprintf (buf, 16, "%ld\n", n);
+    // send_string (buf, sv_socket);
 }
 long recv_long(void)
 {
-    char buf[16];
-    receive_line (buf, 16, sv_socket);
-    return atol(buf);
+    if(RANK < 0)
+        {
+            char buf[16];
+            receive_line (buf, 16, sv_socket);
+            return atol(buf);
+        }
+    else
+        {
+            long dst[1];
+            recv_longs (dst, 1);
+            return dst[0];
+        }
+    // char buf[16];
+    // receive_line (buf, 16, sv_socket);
+    // return atol(buf);
 }
 
 /**/
@@ -160,6 +182,36 @@ int recv_int32s (INT32 *a, int nelm)
   return ret;
 }
 
+/**/
+int send_longs (long *a, int nelm)
+{
+  int ret;
+  ret = send_binary (a, sizeof(long), nelm, sv_socket);
+  return ret;
+}
+    
+int recv_longs (long *a, int nelm)
+{
+  int ret;
+  ret = receive_binary (a, sizeof(long), nelm, sv_socket);
+  return ret;
+}
+
+/**/
+int send_bytes (void *a, int size)
+{
+  int ret;
+  ret = send_binary (a, size, 1, sv_socket);
+  return ret;
+}
+    
+int recv_bytes (void *a, int size)
+{
+  int ret;
+  ret = receive_binary (a, size, 1, sv_socket);
+  return ret;
+}
+
 /* reverse byte order of double values */
 /* assuming that long is 32-bit, and double is 64-bit */
 void swap_doubles (double *a, int n)
@@ -222,19 +274,14 @@ int recv_double_seq (double *a, int nelm)
 int send_doubles (double *a, int nelm)
 {
   int ret;
-  send_binary_header (sizeof(double), nelm);
   ret = send_binary (a, sizeof(double), nelm, sv_socket);
-  send_binary_terminator ();
   return ret;
 }
 
 int recv_doubles (double *a, int nelm)
 {
-  int ret, swp;
-  swp = recv_binary_header (0, 0);
+  int ret;
   ret = receive_binary (a, sizeof(double), nelm, sv_socket);
-  if (swp) swap_doubles (a, nelm);
-  recv_binary_terminator ();
   return ret;
 }
 
diff --git a/src/sample/tcell/sendrecv.h b/src/sample/tcell/sendrecv.h
index eaadf74..5b47fea 100644
--- a/src/sample/tcell/sendrecv.h
+++ b/src/sample/tcell/sendrecv.h
@@ -56,6 +56,14 @@ void swap_int32s (INT32 *a, int n);
 int send_int32s (INT32 *a, int nelm);
 int recv_int32s (INT32 *a, int nelm);
 
+/**/
+int send_longs (long *a, int nelm);
+int recv_longs (long *a, int nelm);
+
+/**/
+int send_bytes (void *a, int size);
+int recv_bytes (void *a, int size);
+
 /**/
 void swap_doubles (double *a, int n);