FreeTDS Development Group

["James K. Lowden" <jklowden AT freetds.org>]

ZIGLIO, Frediano, VF-IT wrote:
> I see you call tds_select before write. Well... this was the way some
> months ago. I changed to call write before in an (paranoid) attempt to
> reduce system calls using operating system tcp buffers. The idea is to
> use always unblocking sockets and call select only when needed. 

"Premature optimization is the root of all evil."  I'm following Stevens's
example.  When this settles down and we know cancel & timeout processing
works, we can look at optimizing reads & writes in the same way.  

Whether we do or don't won't matter IMHO.  Syscalls are very cheap
compared to network I/O, and the memory consumed is minimal.  I doubt the
client will show any performance change.  

--jkl