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@mikeash mikeash/gist:4260612
Created Dec 11, 2012

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Array iteration speed testing
// clang -framework Foundation -fobjc-arc -O3 test.m
#import <Cocoa/Cocoa.h>
static void Time(dispatch_block_t block)
NSProcessInfo *pi = [NSProcessInfo processInfo];
NSTimeInterval start = [pi systemUptime];
int iterations = 100;
for(int i = 0; i < iterations; i++)
NSTimeInterval end = [pi systemUptime];
NSLog(@"Took %f seconds", (end - start) / iterations);
int main(int argc, char **argv)
for(int i = 1; i <= 1000000; i *= 10)
NSMutableArray *array = [NSMutableArray array];
for(int j = 0; j < i; j++)
[array addObject: [[NSObject alloc] init]];
NSLog(@"Testing with %d objects", i);
for(id obj in array)
[obj self];
return 0;

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a2 commented Dec 12, 2012


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