Performance of exception handling

[Alexander]

Hi,

I'm doing some benchmarks (DMD 2.052 on Linux), and noticed that exception handling is terrible
slow even on quite fast hardware.

There is a note on DM's site, saying:

"Because errors are unusual, execution of error handling code is not performance critical."

Well, sure this is (somehow) true, but *so* slow? In my tests, Xeon 3.4 GHz is able to handle
only ca. 1000 exceptions/s (!). 1ms for single exception is a little bit too much, especially
when application needs to recover fast, not to mention that on slower hardware (like Atom) it
will be really slow.

And, since some exceptions are not so unusual in normal flow (file not found, connection reset etc),
"not performance critical" is not really applicable. Simple example - in case of web (or any other)
server with high load, socket exceptions of any kind are quite common. It is still natural to use
try/catch to handle them, but it will slow down everything else (imagine > 1K connections/s and 10%
cut rate).

So, my question - is there something, that can improve performance? Any clues where to dig for this?

Thank you!

Best regards,
/Alexander