Speeding up text file parser (BLAST tabular format)

[Fredrik Boulund via Digitalmars-d-learn]

On Monday, 14 September 2015 at 12:44:22 UTC, Edwin van Leeuwen 
wrote:
> Sounds like this program is actually IO bound. In that case I 
> would not expect a really expect an improvement by using D. 
> What is the CPU usage like when you run this program?
>
> Also which dmd version are you using. I think there were some 
> performance improvements for file reading in the latest version 
> (2.068)

Hi Edwin, thanks for your quick reply!

I'm using v2.068.1; I actually got inspired to try this out after 
skimming the changelog :).

Regarding if it is IO-bound. I actually expected it would be, but 
both the Python and the D-version consume 100% CPU while running, 
and just copying the file around only takes a few seconds (cf 
15-20 sec in runtime for the two programs). There's bound to be 
some aggressive file caching going on, but I figure that would 
rather normalize program runtimes at lower times after running 
them a few times, but I see nothing indicating that.