Are you using aio? If so, which aio?
The default version is provided by glibc, and is for compatibility
rather than performance. It emulates aio using threads.
Try the newsgroups gnu.utils.help or gnu.utils.bug for help.
You might consider trying the SGI version, see http://oss.sgi.com/projects/kaio/
which is more or less native and high performance.
If the above doesn't help, can you post a small test program
demonstrating the problem?
See also http://www.kegel.com/c10k.html for more notes about
this kind of thing.
- Dan
Mikael Vidstedt (mikeee@stacken.kth.se) wrote:
> I'm trying to use non-blocking asynchronous IO, setting a user-defined
> real-time signal to be sent when IO is completed on a socket. This works
> fine most of the time, and I get the specified signal when new data is
> available. However, sometimes signals appear to be lost. Debugging
> indicates that this happens when the remote end closes the socket. The
> problem only occurs when there are many sockets active, all using
> asynchronous IO, and many signals are to be sent. And, yes, I do check for
> SIGIO signals too, but none are sent (i.e. the IO list is not saturated).
>
> The sockets are created as (AF_INET, SOCK_STREAM), and are set to be
> O_NONBLOCK|O_ASYNC using fcntl(). The user-defined signal is the first
> real-time signal (value 32).
>
> Is this a known problem, and if so, is there a work-around?
>
> System: i386 (Pentium II)/Red Hat Linux release 6.0 (Hedwig)
> Kernel: 2.2.16
- Dan
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This archive was generated by hypermail 2b29 : Sat Jul 15 2000 - 21:00:14 EST