> In some areas Go kann keep up with Java but when it comes to string
> operations ("regex-dna" benchmark), Go is even much slower than Ruby
> or Python. Is the status quo going to improve anytime soon? And why is
> Go so terribly slow when it comes to string/RegEx operations?
You assume the benchmark is worth something.
First of all, Ruby and Python are using C implementations
of the regexp search, so Go is being beat by C, not by Ruby.
Second, Go is using a different algorithm for regexp matching
than the C implementations in those other languages.
The algorithm Go uses guarantees to complete in time that is
linear in the length of the input. The algorithm that Ruby/Python/etc
are using can take time exponential in the length of the input,
although on trivial cases it typically runs quite fast.
In order to guarantee the linear time bound, Go's algorithm's
best case speed a little slower than the optimistic Ruby/Python/etc
algorithm. On the other hand, there are inputs for which Go will
return quickly and Ruby/Python/etc need more time than is left
before the heat death of the universe. It's a decent tradeoff.
http://swtch.com/~rsc/regexp/regexp1.html
Russ
at Golang-nuts
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