ceph/src/test/perf_helper.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /* Copyright (c) 2011 Facebook
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR(S) DISCLAIM ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL AUTHORS BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "include/buffer.h"
  19
  20 using namespace ceph;
  21
  22 namespace PerfHelper {
  23
  24 /// Flush the CPU data cache by reading and writing 100MB of new data.
  25 void flush_cache()
  26 {
  27     int hundredMegs = 100 * 1024 * 1024;
  28     volatile char* block = new char[hundredMegs];
  29     for (int i = 0; i < hundredMegs; i++)
  30         block[i] = 1;
  31     delete[] block;
  32 }
  33
  34 /// Used in functionCall().
  35 uint64_t plus_one(uint64_t x)
  36 {
  37     return x + 1;
  38 }
  39
  40 /// Used in throwIntNL.
  41 void throw_int()
  42 {
  43     throw 0;
  44 }
  45
  46 /// Used in throwExceptionNL.
  47 void throw_end_of_buffer()
  48 {
  49     throw buffer::end_of_buffer();
  50 }
  51 }