[erlang-questions] Need help with async disk IO and thread pool on many devices (more than 1 Gbit/s )

Max Lapshin max.lapshin@REDACTED
Sat Apr 13 13:07:43 CEST 2013

I've read sources and found new ideas.

efile_drv.c is using driver_async: DRIVER_ASYNC(d->level, desc, d->invoke,
void_ptr=d, d->free);

desc is a pointer to file structure.

It means, that each request to one opened file descriptor will be executed
on single async thread.

In fact, I need to make an erlang-level job queue for reading from disk.
There is a long queue of disk requests. I can tag them by their "major
device id" or any other tag.

I can track, how many requests are opened and not finished for one tag. If
there is more than N/M requests (where N is async threads size and M is
number of different tags), than request is queued or failed.

So, I think that I don't need to write it in C, I can do it in erlang, but
make the back pressure not on C level, but on Erlang level.
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