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[REBOL] Re: Rebol API to DyBASE

From: knizhnik:garret:ru at: 17-Dec-2003 20:24

Hello Christian, Wednesday, December 17, 2003, 7:48:54 PM, you wrote:
>> Compare the following results: >> Rebol: 18 seconds
CL> h: make hash! 100000 CL> start: now/time/precise CL> for i 1 100000 1 [ insert tail h i ] CL> now/time/precise - start CL> == 0:00:00.25 O, shame on me - I have to guess myself that preallocating hash size will have such effect. with "make hash! 100000" instead of just make hash! [] , results at my computer are: 1.1983 seconds with append, 1.151 with "insert tail" The only justification for my fault is that in ALL other languages I know, omitting initial hash size parameter has no such dramatical influence on performance (usually hash size is doubled) CL> That's 250 msec. Your version runs in about 350 msec. CL> Since I can't imagine you're running a machine 50 times slower than CL> mine, there's something seriously weird going on ... CL> BTW, I still don't quite get why append has to be so much slower than CL> insert tail. Does anyone have any ideas wrt/ that issue? It is clear - append is implemented using insert: append: func [ {Appends a value to the tail of a series and returns the series head.} series [series! port!] value /only "Appends a block value as a block" ][ head either only [ insert/only tail series :value ] [ insert tail series :value ] ] -- Best regards, Konstantin mailto:[knizhnik--garret--ru]