SPPoint pooling vs arc

gistfile1.m

#import <mach/mach_time.h>
void logMachTime_withIdentifier_(uint64_t machTime, NSString *identifier) {
    static double timeScaleSeconds = 0.0;
    if (timeScaleSeconds == 0.0) {
        mach_timebase_info_data_t timebaseInfo;
        if (mach_timebase_info(&timebaseInfo) == KERN_SUCCESS) {    // returns scale factor for ns
            double timeScaleMicroSeconds = ((double) timebaseInfo.numer / (double) timebaseInfo.denom) / 1000;
            timeScaleSeconds = timeScaleMicroSeconds / 1000000;
        }
    }
    
    NSLog(@"%@: %g seconds", identifier, timeScaleSeconds*machTime);
}

// 0.46 seconds
- (void)testPooledPoints
{  
    uint64_t startTime, stopTime;
    startTime = mach_absolute_time();
    
    SPPoint *point = [[SPPoint alloc] initWithX:0.0 y:0.0];
    
    for (int ii = 0; ii < 1000000; ii++) {
        float newX = point.x + 1;
        [point release];
        point = [[SPPoint alloc] initWithX:newX y:0];
    }
    
    stopTime = mach_absolute_time();
    
    STAssertEquals(1000000.0f, point.x, @"X should've been incremented to 1000000, not '%f'", point.x);
    
    logMachTime_withIdentifier_(stopTime - startTime, @"10000000 pooled point instantiations");
}

// 0.52 seconds
- (void)testARCPoints
{
    uint64_t startTime, stopTime;
    startTime = mach_absolute_time();
    
    SPPoint *point = [[SPPoint alloc] initWithX:0.0 y:0.0];
    
    for (int ii = 0; ii < 1000000; ii++) {
        float newX = point.x + 1;
        point = [[SPPoint alloc] initWithX:newX y:0];
    }
    
    stopTime = mach_absolute_time();
    
    STAssertEquals(1000000.0f, point.x, @"X should've been incremented to 1000000, not '%f'", point.x);
    
    logMachTime_withIdentifier_(stopTime - startTime, @"10000000 ARC point instantiations");
}