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Node:IO bound programs,
__dpmi_intso heavily used?
Q: I've profiled my program and found that the routine which takes
60% of the running time is some obscure library function called
__dpmi_int. Can't you guys get your library right?
Q: What is the
__dj_movedata function for, and why does it
take such a large proportion of my program's running time?
A: Does your program use I/O or other real-mode services (like BIOS)
extensively? All those services are invoked through a DPMI function call
which is issued by
__dpmi_int. The sibling function
__dj_movedata moves data between the transfer buffer
(see what is the transfer buffer) and your program, e.g., when it reads or writes disk files.
So what the profile really says is that the running time of your program
is governed by time-consuming operations such as disk I/O.