Time measurement NSDateFormatter creation. Not Use ARC.

time_nsdateformatter.m

//
//  main.m
//  CodeTest
//
//  Created by eien.support@gmail.com on 2013/01/09.
//  Copyright (c) 2013 Eien Factory. All rights reserved.
//

// ARC=OFF

#import <Foundation/Foundation.h>
#import <mach/mach_time.h>

#define TEST 4

int main(int argc, const char * argv[])
{
    NSString *aString;
    NSDateFormatter *dateFormatter;
    NSDate *aDate;
    @autoreleasepool {
        uint64_t start, elapsed;
        mach_timebase_info_data_t base;
        mach_timebase_info(&base);

        aDate = [NSDate date];
        
        start = mach_absolute_time();

#if TEST==1
        //time = 10235446(nsec)
        dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
        dateFormatter.dateFormat = @"y/M/d HH:mm:ss";
        for ( int i = 0; i < 1000; i++ ) {
            aString = [dateFormatter stringFromDate:aDate];
        }
#elif TEST==2
        //time = 11717976(nsec)
        dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
        for ( int i = 0; i < 1000; i++ ) {
            dateFormatter.dateFormat = @"y/M/d HH:mm:ss";
            aString = [dateFormatter stringFromDate:aDate];
        }
#elif TEST==3
        //time = 152146810(nsec)
        for ( int i = 0; i < 1000; i++ ) {
            dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
            dateFormatter.dateFormat = @"y/M/d HH:mm:ss";
            aString = [dateFormatter stringFromDate:aDate];
        }
#elif TEST==4
        //time = 149760378(nsec)
        for ( int i = 0; i < 1000; i++ ) {
            dateFormatter = [[NSDateFormatter alloc] init];
            dateFormatter.dateFormat = @"y/M/d HH:mm:ss";
            aString = [dateFormatter stringFromDate:aDate];
            [dateFormatter release];
        }
#endif
        elapsed = mach_absolute_time() - start;
        uint64_t nsec = elapsed * base.numer / base.denom;
        printf("time = %lld(nsec)\n",nsec);
        NSLog(@"%@",aString);
    }
    return 0;
}