> I tend to agree with Alastair. I just reran the experiments
> with BinIOs
> instead of BinMems to see if there was a greater difference
> (I expect a
> much smaller difference, in fact, due to the high disk
> overhead and the
> fact that putChar is slow). I didn't both with -O0, but with
> -O2, we get:
>
> bits read 2156
> write 2639
>
> bytes read 1617
> write 2078
>
> frankly, this shocks me. reading using bits is 33% slower; writing is
> about 27% slower. i actually expected the bits version to be *faster*
> (relatively, of course) here, due to the fact that we have
> much smaller
> files (the byte-based file is 4200000 bytes while the
> bit-based file is
> 3325000 bytes). With a 33% difference, I think I might want separate
> instances again :).
Try profiling. It's hard to tell where the speed is going without
seeing the code - would you like to put it up somewhere so we can take a
look?
Remember that putByte and friends have been carefully tuned, I suspect
we'll need to take a close look at the compiler output for your bit
versions and tweak a few things.
Cheers,
Simon
