Christophe TROESTLER <christophe.troestler+oc...@umons.ac.be> writes:
> On Thu, 29 Oct 2009 18:05:37 +0100, Goswin von Brederlow wrote:
>>
>> get an int out of a string:
>> C Ocaml
>> uint8 le 19.496 17.433
>> int8 le 19.298 17.850
>> uint16 le 19.427 25.046
>> int16 le 19.383 27.664
>> uint16 be 20.502 23.200
>> int16 be 20.350 27.535
>>
>> get an int out of a Bigarray.Array1.t:
>> safe unsafe
>> uint8 le 55.194s 54.508s
>> uint64 le 80.51s 81.46s
>>
>> The Bigarray unsafe_get is really disapointing. Note that uint64 is so
>> much slower because of allocating the result (my guess). Array1.set
>> runs the same speed for uint8 and uint64.
>
> This is likely because you used the polymorphic function to access
> bigarrays (compile your code with -annot and press C-c C-t in Emacs
> with the point on the variable). For the compiler to be able to emit
> fast code, you need to provide the monomorphic type of the bigarray:
>
> (a: (int, int8_unsigned_elt, c_layout) Array1.t)
>
> (assuming you opened the Bigarray module).
>
> Cheers,
> C.
Wow, you are right. Down to 14.919s. String.unsafe_get, which actualy
does exist despite not being documented, gets 14.843s. So basically the
same.
MfG
Goswin
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