fadvise calls

examples/concurrent-write-bench.c

@@ -185,6 +185,10 @@ static void abt_bench(int buffer_per_thread, unsigned int concurrency, size_t si
     }
     ret = fallocate(fd, 0, 0, 10737418240UL);
     assert(ret == 0);
+    ret = posix_fadvise(fd, 0, 10737418240UL, POSIX_FADV_DONTNEED);
+    assert(ret == 0);
+    ret = posix_fadvise(fd, 0, 10737418240UL, POSIX_FADV_SEQUENTIAL);
+    assert(ret == 0);
 
     tid_array = malloc(concurrency * sizeof(*tid_array));
     assert(tid_array);
@@ -304,6 +308,10 @@ static void abt_bench_nb(int buffer_per_thread, unsigned int concurrency, size_t
     }
     ret = fallocate(fd, 0, 0, 10737418240UL);
     assert(ret == 0);
+    ret = posix_fadvise(fd, 0, 10737418240UL, POSIX_FADV_DONTNEED);
+    assert(ret == 0);
+    ret = posix_fadvise(fd, 0, 10737418240UL, POSIX_FADV_SEQUENTIAL);
+    assert(ret == 0);
 
     /* initialize abt_io */
     /* NOTE: for now we are going to use the same number of execution streams
@@ -396,6 +404,10 @@ static void pthread_bench(int buffer_per_thread, unsigned int concurrency, size_
     }
     ret = fallocate(fd, 0, 0, 10737418240UL);
     assert(ret == 0);
+    ret = posix_fadvise(fd, 0, 10737418240UL, POSIX_FADV_DONTNEED);
+    assert(ret == 0);
+    ret = posix_fadvise(fd, 0, 10737418240UL, POSIX_FADV_SEQUENTIAL);
+    assert(ret == 0);
 
     id_array = malloc(concurrency * sizeof(*id_array));
     assert(id_array);