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* Copyright (C) 2009, International Business Machines
* Corporation and others. All Rights Reserved.
* file name: ucnvavailperf.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
* created on: 2009apr06
* created by: Markus W. Scherer
* Test performance (time & memory) of ucnv_countAvailable(),
* for a before-and-after comparison of
* ticket 6441: make ucnv_countAvailable() not fully load converters
* Run with one optional command-line argument:
* You can specify the path to the ICU data directory.
* I built the common (icuuc) library with the following modification,
* switching between old (pre-ticket-6441) behavior of actually
* trying to load all converters and new behavior of just doing enough
* to test availability.
* Code in the ucnv_bld.c haveAvailableConverterList() function:
#if 0
// old pre-ticket-6441 behavior
ucnv_close(ucnv_createConverter(&tempConverter, converterName, &localStatus));
if (U_SUCCESS(localStatus)) {
// new behavior
if (ucnv_canCreateConverter(converterName, &localStatus)) {
#include <malloc.h>
#include <stdio.h>
#include "unicode/utypes.h"
#include "unicode/putil.h"
#include "unicode/uclean.h"
#include "unicode/ucnv.h"
#include "unicode/utimer.h"
static size_t icuMemUsage = 0;
my_alloc(const void *context, size_t size) {
size_t *p = (size_t *)malloc(size + sizeof(size_t));
if (p != NULL) {
icuMemUsage += size;
*p = size;
return p + 1;
} else {
return NULL;
my_free(const void *context, void *mem) {
if (mem != NULL) {
const size_t *p = (const size_t *)mem - 1;
icuMemUsage -= *p;
free((void *)p);
// Not used in the common library.
my_realloc(const void *context, void *mem, size_t size) {
my_free(context, mem);
return NULL;
int main(int argc, const char *argv[]) {
UErrorCode errorCode = U_ZERO_ERROR;
// Hook in our own memory allocation functions so that we can measure
// the memory usage.
u_setMemoryFunctions(NULL, my_alloc, my_realloc, my_free, &errorCode);
if(U_FAILURE(errorCode)) {
"u_setMemoryFunctions() failed - %s\n",
return errorCode;
if (argc > 1) {
printf("u_setDataDirectory(%s)\n", argv[1]);
// Preload a purely algorithmic converter via an alias,
// to make sure that relevant data can be loaded and to set up
// caches and such that are needed even if none of the data-driven
// converters needs to be loaded.
ucnv_close(ucnv_open("ibm-1208", &errorCode));
if(U_FAILURE(errorCode)) {
"unable to open UTF-8 converter via an alias - %s\n",
return errorCode;
printf("memory usage after ucnv_open(ibm-1208): %lu\n", (long)icuMemUsage);
UTimer start_time;
// Measure the time to find out the list of actually available converters.
int32_t count = ucnv_countAvailable();
double elapsed = utimer_getElapsedSeconds(&start_time);
printf("ucnv_countAvailable() reports that %d converters are available.\n", count);
printf("ucnv_countAvailable() took %g seconds to figure this out.\n", elapsed);
printf("memory usage after ucnv_countAvailable(): %lu\n", (long)icuMemUsage);
printf("memory usage after ucnv_flushCache(): %lu\n", (long)icuMemUsage);
printf("memory usage after u_cleanup(): %lu\n", (long)icuMemUsage);
return 0;