icuSources/test/perf/ucnvavailperf/ucnvavailperf.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 2009, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  ucnvavailperf.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 *
  13 *   created on: 2009apr06
  14 *   created by: Markus W. Scherer
  15 *
  16 *   Test performance (time & memory) of ucnv_countAvailable(),
  17 *   for a before-and-after comparison of
  18 *   ticket 6441: make ucnv_countAvailable() not fully load converters
  19 *
  20 *   Run with one optional command-line argument:
  21 *   You can specify the path to the ICU data directory.
  22 *
  23 *   I built the common (icuuc) library with the following modification,
  24 *   switching between old (pre-ticket-6441) behavior of actually
  25 *   trying to load all converters and new behavior of just doing enough
  26 *   to test availability.
  27 *
  28 *   Code in the ucnv_bld.c haveAvailableConverterList() function:
  29 #if 0
  30             // old pre-ticket-6441 behavior
  31             ucnv_close(ucnv_createConverter(&tempConverter, converterName, &localStatus));
  32             if (U_SUCCESS(localStatus)) {
  33 #else
  34             // new behavior
  35             if (ucnv_canCreateConverter(converterName, &localStatus)) {
  36 #endif
  37 */
  38
  39 #include <malloc.h>
  40 #include <stdio.h>
  41 #include "unicode/utypes.h"
  42 #include "unicode/putil.h"
  43 #include "unicode/uclean.h"
  44 #include "unicode/ucnv.h"
  45 #include "unicode/utimer.h"
  46
  47 static size_t icuMemUsage = 0;
  48
  49 U_CDECL_BEGIN
  50
  51 void *U_CALLCONV
  52 my_alloc(const void *context, size_t size) {
  53     size_t *p = (size_t *)malloc(size + sizeof(size_t));
  54     if (p != NULL) {
  55         icuMemUsage += size;
  56         *p = size;
  57         return p + 1;
  58     } else {
  59         return NULL;
  60     }
  61 }
  62
  63 void U_CALLCONV
  64 my_free(const void *context, void *mem) {
  65     if (mem != NULL) {
  66         const size_t *p = (const size_t *)mem - 1;
  67         icuMemUsage -= *p;
  68         free((void *)p);
  69     }
  70 }
  71
  72 // Not used in the common library.
  73 void *U_CALLCONV
  74 my_realloc(const void *context, void *mem, size_t size) {
  75     my_free(context, mem);
  76     return NULL;
  77 }
  78
  79 U_CDECL_END
  80
  81 int main(int argc, const char *argv[]) {
  82     UErrorCode errorCode = U_ZERO_ERROR;
  83
  84     // Hook in our own memory allocation functions so that we can measure
  85     // the memory usage.
  86     u_setMemoryFunctions(NULL, my_alloc, my_realloc, my_free, &errorCode);
  87     if(U_FAILURE(errorCode)) {
  88         fprintf(stderr,
  89                 "u_setMemoryFunctions() failed - %s\n",
  90                 u_errorName(errorCode));
  91         return errorCode;
  92     }
  93
  94     if (argc > 1) {
  95         printf("u_setDataDirectory(%s)\n", argv[1]);
  96         u_setDataDirectory(argv[1]);
  97     }
  98
  99     // Preload a purely algorithmic converter via an alias,
 100     // to make sure that relevant data can be loaded and to set up
 101     // caches and such that are needed even if none of the data-driven
 102     // converters needs to be loaded.
 103     ucnv_close(ucnv_open("ibm-1208", &errorCode));
 104     if(U_FAILURE(errorCode)) {
 105         fprintf(stderr,
 106                 "unable to open UTF-8 converter via an alias - %s\n",
 107                 u_errorName(errorCode));
 108         return errorCode;
 109     }
 110
 111     printf("memory usage after ucnv_open(ibm-1208): %lu\n", (long)icuMemUsage);
 112
 113     UTimer start_time;
 114     utimer_getTime(&start_time);
 115     // Measure the time to find out the list of actually available converters.
 116     int32_t count = ucnv_countAvailable();
 117     double elapsed = utimer_getElapsedSeconds(&start_time);
 118     printf("ucnv_countAvailable() reports that %d converters are available.\n", count);
 119     printf("ucnv_countAvailable() took %g seconds to figure this out.\n", elapsed);
 120     printf("memory usage after ucnv_countAvailable(): %lu\n", (long)icuMemUsage);
 121
 122     ucnv_flushCache();
 123     printf("memory usage after ucnv_flushCache(): %lu\n", (long)icuMemUsage);
 124
 125     u_cleanup();
 126     printf("memory usage after u_cleanup(): %lu\n", (long)icuMemUsage);
 127
 128     return 0;
 129 }