On 7/31/2013 1:01 PM, "Greg Parker" <gpar...@apple.com> wrote:
>Simple alloc/init is the fastest:
>
>100 [[[NSMutableString alloc] init] release]
>102 [[NSMutableString new] release]
>109 [NSMutableString string] // ARC enabled
>117 [[@"" mutableCopy] release]
>119 @autoreleasepool { [NSMutableString string]; } // ARC disabled
>129 [[[NSMutableString alloc] initWithString:@""] release]
>
>(Smaller numbers are better. Numbers are getrusage(RUSAGE_SELF) time for
>10000000 iterations, normalized to fastest=100. Your mileage may vary.)
>
Yeah, those numbers make sense from a "theoretical" standpoint (i.e.
without looking at the source code). The +new call theoretically calls
+alloc/-init so would be slightly slower due to three method calls
(+new/+alloc/-init) and the -init call theoretically can do very little
until actual data is supplied while the others with actual data might add
the overhead of defining the actual data; theoretically, an empty string
is more data than no data yet to be filled.
--
Gary L. Wade
http://www.garywade.com/
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