[pypy-issue] [issue729] Pypy strangely slow when reading files

[Armin Rigo]

Armin Rigo <armin.rigo at gmail.com> added the comment:

I did that in the branch 'buffer-readline', but did not test it much so far. 
Due to the different levels we use, it needs a new layer in streamio.py that
does minimal buffering for readline() even in otherwise non-buffered streams. 
As a side-effect, the app-level readline() is faster too, not just iteration
(i.e. next()).  It needs careful review, and also thinking if doing buffering
when the app-level readline() is called is reasonable, or potentially breaks
subtle cases.

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