大约有 3,285 项符合查询结果（耗时：0.0291秒） [XML]
Which sort algorithm works best on mostly sorted data? [closed]
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log(n!) is not fast. wolframalpha.com/input/?i=plot[log(N!),{N,0,1000}]
– Behrooz
Dec 10 '09 at 10:36
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Java NIO FileChannel versus FileOutputstream performance / usefulness
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My experience with larger files sizes has been that java.nio is faster than java.io. Solidly faster. Like in the >250% range. That said, I am eliminating obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:
The buffer size...
2D cross-platform game engine for Android and iOS? [closed]
...gines I've ever used, works on almost all platforms, and performs twice as fast as cocos2d-x in most tests I've done. You can use any JVM language you like. Here's a 13 part tutorial in Java, and here's a bunch using jruby. There's a good skeletal animation tool that works with it here, and it has b...
How is Python's List Implemented?
...is old and dog slow - on the bright side, I can assume that code that runs fast enough for me is fast enough for all users :D
– user395760
Oct 12 '10 at 19:58
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git rebase, keeping track of 'local' and 'remote'
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@VonC Do you mean that in the case of fast-forward we still get 6', 7' and 8'? Or do you mean, as my last picture tries to show, that if we can't fast-forward the whole sequence generates new commits?
– thoni56
Sep 18 at 8:1...
Fastest way to check if a string matches a regexp in ruby?
What is the fastest way to check if a string matches a regular expression in Ruby?
7 Answers
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mongodb: insert if not exists
... key in there (which it sounds like there will be). THIS WILL HAPPEN VERY FAST. Bulk inserts rock, I've gotten 15k/second performance levels. Further notes on ContinueOnError, see http://docs.mongodb.org/manual/core/write-operations/
Record inserts happen VERY fast, so you'll be done with those ...
What is the purpose of setting a key in data.table?
...umns by setting an attribute called sorted to DT.
The reordering is both fast (due to data.table's internal radix sorting) and memory efficient (only one extra column of type double is allocated).
When is setkey() required?
For grouping operations, setkey() was never an absolute requirement. Tha...
how to exclude null values in array_agg like in string_agg using postgres?
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This works and is fast and elegant, it solved me a problem similar to the OP's. A reason to upgrading to 9.3 for those who didn't do it yet. +1
– Pavel V.
Aug 29 '14 at 8:41
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efficient circular buffer?
...e O(1) and as you say the extra overhead is in C, so should still be quite fast
– John La Rooy
Nov 11 '10 at 9:38
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