Re: Parallel multithreading for I/O operation in linux ?

James Kanze <>
Tue, 1 Jul 2008 05:06:13 -0700 (PDT)
On Jul 1, 12:20 pm, Michael DOUBEZ <> wrote:

Robot a =E9crit :

Your schema is still sequential.

your 'p's depend on 'r's.

So you should have 4 threads that do 'r' + 'p' in sequence.

No it is not. Re-read the OP question.
It is a classical producer/consumer schema.

The answer is likely to be a bounded I/O or a bug as Gianni
Mariani said.

It may also depend on the implementation of threads. Some early
thread implementations in Linux or Solaris, for example, would
suspend the process when a thread waited, even if other threads
had something to do. (This shouldn't be a problem if you have
an up-to-date kernel, and are using pthreads, at least with
these two systems. But you never know.)

James Kanze (GABI Software)
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