jacobian

commit 6c3ed655db0e33e75b149fb52b7b28479f233963
parent 397f25ebd75cf10c3a57ef0599dab8092100bf6d
Author: David Freifeld <freifeld.david@gmail.com>
Date:   Tue, 22 Sep 2020 13:24:52 -0700

backing up

Diffstat:
M
src/experimental/fileread.cpp
 | 
26
+++++++++++++++-----------

1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/src/experimental/fileread.cpp b/src/experimental/fileread.cpp
@@ -100,12 +100,12 @@ void prep()
 
 float newer()
 {
-    static const auto BUFFER_SIZE = 100*1024;
+    static const auto BUFFER_SIZE = 2000*1024;
     int fd = open("../../data_banknote_authentication.bin", O_RDONLY | O_NONBLOCK);
     uintmax_t maxlines = 1003222;
     if(fd == -1) {
-        printf("fd == -1\n");
-        return 1;
+        printf("Cannot open file.");
+        exit(1);
     }
     char buf[BUFFER_SIZE];
     uintmax_t lines = 0;
@@ -114,38 +114,42 @@ float newer()
     {
         if(bytes_read == (size_t)-1) {
             printf("bytes_read == (size_t)-1\n");
-            return 1;
+            exit(1);
         }
         if (!bytes_read) break;
         for(char *p = buf; p < buf+BUFFER_SIZE;) {
             //if (lines > maxlines) break;
             for (int i=0; i<5; ++i) {
                 tmp = *((float*)p);
-                if (lines % 1342 == 0 || lines >= maxlines) printf("%f ", tmp);
+                //if (lines % 1342 == 0 || lines >= maxlines) printf("%f ", tmp);
                 p += sizeof(float);
             }
-            if (lines % 1342 == 0 || lines >= maxlines) printf("\n");
+            //if (lines % 1342 == 0 || lines >= maxlines) printf("\n");
             //            printf("\n");
             //if (lines > BUFFER_SIZE / 20 + 1) assert(0);
             ++lines;
         }
-        //        printf("lines %d (%f)\n", lines, tmp);
     }
-    printf("%ju\n", lines);
     return tmp;
 }
 
 int main () {
+    int epochs = 10;
+    float tmp;
     auto start = std::chrono::high_resolution_clock::now();
     prep();
     auto prep_end = std::chrono::high_resolution_clock::now();
-    float tmp = newer();
+    for (int i = 0; i < epochs; i++) {
+        tmp = newer();
+    }
     auto end = std::chrono::high_resolution_clock::now();
     double time = std::chrono::duration_cast<std::chrono::nanoseconds>(end - prep_end + prep_end-start).count() / pow(10,9);
     double runtime = std::chrono::duration_cast<std::chrono::nanoseconds>(end - prep_end).count() / pow(10,9);
-    
+    float ftmp;
     auto f_start = std::chrono::high_resolution_clock::now();
-    float ftmp = current();
+    for (int i = 0; i < epochs; i++) {
+        ftmp = current();
+    }
     auto f_end = std::chrono::high_resolution_clock::now();
     // if (flines == lines) std::cout << "Linecount is valid!" << "\n";
     // else std::cout << "WARN: INVALID LINECOUNT " << lines << " vs. " << flines << "\n";