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Re: Linux vs. libio
Kevin Atkinson <kevinatk@home.com> writes:
> Will that extra level of indirection *really* make a diffrence in speed I
> mean IO is something which is fairly slow in the first place.
My guess is it can make a big difference. The memory cost of copying
bytes around seems to be a significant factor in I/O. At least the
people who work on kernels seem to think so, as they spend a lot of
effort on sharing buffers, copy-on-write, minimizing copying, DMA,
etc.
Whether the extra indirection for putc/getc type operations make
a real difference depends on how common they are compared to
other operations.
--
--Per Bothner
per@bothner.com http://www.bothner.com/~per/