ScalarCache allocate memory when it is used in the first time

the size difference is 3 * ValueType because we use 3 process for mpi

Author: yhmtsai

benchmark/test/reference/distributed_solver.profile.stderr

@@ -62,8 +62,6 @@ DEBUG: end   copy
 DEBUG: begin copy
 DEBUG: end   copy
 DEBUG: end   copy(<typename>)
-DEBUG: begin dense::fill
-DEBUG: end   dense::fill
 DEBUG: begin components::aos_to_soa
 DEBUG: end   components::aos_to_soa
 DEBUG: begin distributed_matrix::separate_local_nonlocal
@@ -148,6 +146,8 @@ DEBUG: begin advanced_apply(<typename>)
 DEBUG: begin csr::advanced_spmv
 DEBUG: end   csr::advanced_spmv
 DEBUG: end   advanced_apply(<typename>)
+DEBUG: begin dense::fill
+DEBUG: end   dense::fill
 DEBUG: begin advanced_apply(<typename>)
 DEBUG: begin csr::advanced_spmv
 DEBUG: end   csr::advanced_spmv

benchmark/test/reference/spmv_distributed.profile.stderr

@@ -78,8 +78,6 @@ DEBUG: end   copy
 DEBUG: begin copy
 DEBUG: end   copy
 DEBUG: end   copy(<typename>)
-DEBUG: begin dense::fill
-DEBUG: end   dense::fill
 DEBUG: begin components::aos_to_soa
 DEBUG: end   components::aos_to_soa
 DEBUG: begin distributed_matrix::separate_local_nonlocal
@@ -128,6 +126,8 @@ DEBUG: begin apply(<typename>)
 DEBUG: begin csr::spmv
 DEBUG: end   csr::spmv
 DEBUG: end   apply(<typename>)
+DEBUG: begin dense::fill
+DEBUG: end   dense::fill
 DEBUG: begin advanced_apply(<typename>)
 DEBUG: begin csr::advanced_spmv
 DEBUG: end   csr::advanced_spmv

benchmark/test/reference/spmv_distributed.profile.stdout

@@ -5,7 +5,7 @@
         "comm_pattern": "stencil",
         "spmv": {
             "csr-csr": {
-                "storage": 11476,
+                "storage": 11452,
                 "time": 1.0,
                 "repetitions": 1,
                 "completed": true

benchmark/test/reference/spmv_distributed.simple.stdout

@@ -5,7 +5,7 @@
         "comm_pattern": "stencil",
         "spmv": {
             "csr-csr": {
-                "storage": 11476,
+                "storage": 11452,
                 "max_relative_norm2": 1.0,
                 "time": 1.0,
                 "repetitions": 10,

benchmark/test/reference/spmv_distributed_dcomplex.simple.stdout

@@ -5,7 +5,7 @@
         "comm_pattern": "stencil",
         "spmv": {
             "csr-csr": {
-                "storage": 17300,
+                "storage": 17252,
                 "max_relative_norm2": 1.0,
                 "time": 1.0,
                 "repetitions": 10,