stdio and Tango I/O performance

[Andrei Alexandrescu (See Website For Email)]

Lars Ivar Igesund wrote:
> Andrei Alexandrescu (See Website For Email) wrote:
> 
>> Lars Ivar Igesund wrote:
>>> Andrei Alexandrescu (See Website For Email) wrote:
>>>
>>>> Lars Ivar Igesund wrote:
>>>>> Andrei Alexandrescu (See Website For Email) wrote:
>>>>>
>>>>>> This ate a lot of time measuring, testing, and optimizing. So I have a
>>>>>> question - has anyone verified that Tango's I/O performance is up to
>>>>>> snuff? I see it imposes the dynamic-polymorphic approach, and unless
>>>>>> there was some serious performance work going on, it's possible it's
>>>>>> even slower than stdio.
>>>>> If you have actually tested Tango IO and finds it to be slower than
>>>>> the "new" stdio, then this would be interesting to know, and also the
>>>>> test harness in use. If not, I find your suggestive tone above to be
>>>>> rather rude, given the time put into making Tango IO as good as
>>>>> possible. If the IO in Phobos has been as slow as you say, I highly
>>>>> doubt that Tango has been in similar ranges, given that it obviates C
>>>>> IO by going directly to the OS via a buffer.
>>>>>
>>>>> Now, if you have tested that Tango's IO is slower than Phobos, then
>>>>> maybe you could spend some time helping to improve it too? Your
>>>>> approach above is rather unconstructive in an overall fashion.
>>>> This is a misunderstanding. To date I haven't downloaded Tango.
>>> Then you should before making any sorts of comments in this vein. Maybe
>>> you even should have compared Tango's IO performance to Phobos' prior to
>>> making such huge efforts to improve on it (Phobos IO)?
>> Could you please put the gun down. Sheesh. Which comments? What vein? It
>> was a question. I simply asked whether there has been performance work
>> on Tango's I/O, without having any prior experience with it. I don't see
>> reason for anyone to get offended about that.
> 
> No, I was not offended (not easily done), but I did find your wording
> suggestive. And you did give the impression that you had _some_ knowledge
> of Tango.
> 
> As for that exact question; yes, performance is an important facet of Tango,
> IO likewise. Slow IO in Tango would be a defect. And it would be nice to
> have an unbiased comparison of the two.

Excellent! I have collected some data on stdio and a couple of 
baselines, and I'll install Tango now. In fact I've already hit a hitch: 
  README.txt sends the reader to 
http://dsource.org/projects/tango/wiki/TopicInstallTango which says one 
should run ./lib/install-dmd.sh, which is not to be found in the 
distribution... probably I'll need to set an account on dsource.org and 
ask there.


Andrei