Polished code

.vscode/settings.json

@@ -0,0 +1,60 @@
+{
+    "files.associations": {
+        "iomanip": "cpp",
+        "array": "cpp",
+        "atomic": "cpp",
+        "bit": "cpp",
+        "*.tcc": "cpp",
+        "cctype": "cpp",
+        "charconv": "cpp",
+        "chrono": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "compare": "cpp",
+        "complex": "cpp",
+        "concepts": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "deque": "cpp",
+        "string": "cpp",
+        "unordered_map": "cpp",
+        "vector": "cpp",
+        "exception": "cpp",
+        "algorithm": "cpp",
+        "functional": "cpp",
+        "iterator": "cpp",
+        "memory": "cpp",
+        "memory_resource": "cpp",
+        "numeric": "cpp",
+        "optional": "cpp",
+        "random": "cpp",
+        "ratio": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "utility": "cpp",
+        "format": "cpp",
+        "fstream": "cpp",
+        "initializer_list": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "new": "cpp",
+        "numbers": "cpp",
+        "ostream": "cpp",
+        "span": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "typeinfo": "cpp",
+        "variant": "cpp"
+    }
+}

benchmark.cpp

@@ -39,17 +39,17 @@ int main(int argc, char **argv)
       setup(n, &A[0]);
 
       // insert your timer code here
-      std::chrono::time_point<std::chrono::high_resolution_clock> start_time = std::chrono::high_resolution_clock::now();
+      auto start_time = std::chrono::high_resolution_clock::now();
 
       // invoke method to perform the sum
       t = sum(n, &A[0]);
 
       // insert your end timer code here, and print out elapsed time for this problem size
-      std::chrono::time_point<std::chrono::high_resolution_clock> end_time = std::chrono::high_resolution_clock::now();
+      auto end_time = std::chrono::high_resolution_clock::now();
 
       std::chrono::duration<double> elapsed = end_time - start_time;
 
-      std::cout << " Elapsed time is : " << elapsed.count() << " " << std::endl;
+      printf("Elapsed time is: %.2f seconds\n", elapsed.count());
 
       printf(" Sum result = %lld \n", t);
 

data.md

@@ -0,0 +1,6 @@
+| problem size | sum_direct_time | sum_indirect_time | sum_vector_ time |
+| -- | -- | -- | -- |
+| N=8388608 | 0.00 | -- | -- |
+| N=16777216 | 0.01 | -- | -- |
+| N=33554432 | 0.01 | -- | -- |
+| 

sum_direct.cpp

@@ -7,13 +7,13 @@
 #include <string.h>
 
 
-int64_t result;
+int64_t numSum;
 
 void 
 setup(int64_t N, uint64_t A[])
 {
    printf(" inside direct_sum problem_setup, N=%lld \n", N);
-   result = 0;
+   numSum = 0;
 }
 
 int64_t
@@ -22,8 +22,8 @@ sum(int64_t N, uint64_t A[])
    printf(" inside direct_sum perform_sum, N=%lld \n", N);
    for (int64_t i = 0; i < N; i++)
    {
-      result += i;
+      numSum += i;
    }
-   return result;
+   return numSum;
 }
 

sum_indirect.cpp

@@ -6,31 +6,29 @@
 #include <vector>
 #include <string.h>
 
-int64_t result;
+int64_t sumResult;
 
-void 
-setup(int64_t N, uint64_t A[])
+void setup(int64_t N, uint64_t A[])
 {
-   std::cout << "Inside setup, N = " << std::endl;
-   result = 0;
+   printf(" inside sum_indirect problem_setup, N=%lld \n", N);
+   sumResult = 0;
 
    for (int64_t i = 0; i < N; i++)
    {
       A[i] = lrand48() % N;
    }
-   
 }
 
 int64_t
 sum(int64_t N, uint64_t A[])
 {
-   int64_t indx = A[0];
+   printf(" inside sum_indirect perform_sum, N=%lld \n", N);
+   int64_t counter = A[0];
    for (int64_t i = 0; i < N; i++)
    {
-      result += indx;
-      indx = A[indx];
+      sumResult += counter;
+      counter = A[counter];
    }
 
-   return result;
+   return sumResult;
 }
-

sum_vector.cpp

@@ -6,13 +6,13 @@
 #include <vector>
 #include <string.h>
 
-int64_t result;
+int64_t numSum;
 
 void 
 setup(int64_t N, uint64_t A[])
 {
    printf(" inside sum_vector problem_setup, N=%lld \n", N);
-   result = 0;
+   numSum = 0;
    for (int64_t i = 0; i < N; i++)
    {
       A[i] = i;
@@ -26,9 +26,9 @@ sum(int64_t N, uint64_t A[])
    printf(" inside sum_vector perform_sum, N=%lld \n", N);
    for (int64_t i = 0; i < N; i++)
    {
-      result += A[i];
+      numSum += A[i];
    }
    
-   return result;
+   return numSum;
 }