[MLton-devel] streamIO

[Stephen Weeks]

> I'm still curious about one anomaly.  With the old IO, I get:
...
> <Posix_IO_read>    18.0% (14.46s) 18.0% (14.46s) 0.0%  (0.0s)
...
> <Posix_IO_read>    25.5% (26.13s) 25.5% (26.13s) 0.0%  (0.0s)
> 
> Now, the number of calls to Posix_IO_read and the arguments to it are the
> same in both programs.  The only thing I can think of is that if the new
> IO is just a little slower, then the difference in time between calls is
> enough to cause a difference in the system call response (caching, paging,
> etc.).

Hopefully this anomaly is due to the problem with
gcState.currentSource being cached in a register.  Let's try the
benchmark again once that bug is fixed.


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