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 #include "common/error_code.h"
  20
  21 using namespace ceph;
  22
  23 namespace PerfHelper {
  24
  25 /// Flush the CPU data cache by reading and writing 100MB of new data.
  26 void flush_cache()
  27 {
  28     int hundredMegs = 100 * 1024 * 1024;
  29     volatile char* block = new char[hundredMegs];
  30     for (int i = 0; i < hundredMegs; i++)
  31         block[i] = 1;
  32     delete[] block;
  33 }
  34
  35 /// Used in functionCall().
  36 uint64_t plus_one(uint64_t x)
  37 {
  38     return x + 1;
  39 }
  40
  41 /// Used in throwIntNL.
  42 void throw_int()
  43 {
  44     throw 0;
  45 }
  46
  47 /// Used in throwExceptionNL.
  48 void throw_end_of_buffer()
  49 {
  50     throw buffer::end_of_buffer();
  51 }
  52 }