Changeset 5f648fb3 for doc/theses/colby_parsons_MMAth/benchmarks/mutex_stmt/bench.h

Timestamp:

Mar 19, 2023, 1:51:35 PM (17 months ago)

Author:

caparsons <caparson@…>

Branches:

ADT, ast-experimental, master

Children:

cd477ca

Parents:

0da7181

Message:

updated runscript and shared header for rand bench

File:

• doc/theses/colby_parsons_MMAth/benchmarks/mutex_stmt/bench.h (modified) (2 diffs)

doc/theses/colby_parsons_MMAth/benchmarks/mutex_stmt/bench.h

@@ -47 +47 @@
 #endif
 
-size_t threads = 1;
+size_t threads = 1, num_locks = -1;
 
 #define BENCH_START()                           \
-        if ( argc > 2 ) exit( EXIT_FAILURE );   \
+        if ( argc > 3 ) exit( EXIT_FAILURE );   \
         if ( argc == 2 ) {                      \
                 threads = atoi( argv[1] );      \
+        } else if ( argc == 3 ) {                       \
+                threads = atoi( argv[1] );      \
+        num_locks = atoi( argv[2] );    \
         }
 
@@ -77 +80 @@
 }
 #endif
+
+// splitmix64 rand num generator
+// https://rosettacode.org/wiki/Pseudo-random_numbers/Splitmix64
+uint64_t state;                                  /* The state can be seeded with any (upto) 64 bit integer value. */
+
+uint64_t next_int() {
+    state += 0x9e3779b97f4a7c15;               /* increment the state variable */
+    uint64_t z = state;                          /* copy the state to a working variable */
+    z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;  /* xor the variable with the variable right bit shifted 30 then multiply by a constant */
+    z = (z ^ (z >> 27)) * 0x94d049bb133111eb;  /* xor the variable with the variable right bit shifted 27 then multiply by a constant */
+    return z ^ (z >> 31);                      /* return the variable xored with itself right bit shifted 31 */
+}
+