07-Feb-2014 23:45, Walter Bright пишет:
On 2/7/2014 7:33 AM, Adam D. Ruppe wrote:
On Friday, 7 February 2014 at 11:37:16 UTC, Ola Fosheim Grøstad wrote:
How slow is slow? Is it slower than in Go and Python?
One problem with allocating the exception is the stop-the-world thing. My
cgi.d's built in httpd does some allocations in its constructor, which
is run
once per request. It can answer requests at a rate of about 6000/sec
on my
computer...
The gc is not the real speed issue with exceptions, after all, one can
preallocate the exception:
throw new Exception();
v.s.
e = new Exception();
...
throw e;
And the standard library basically can't do this for every function.
It's the unwinding speed. Just have a look at what deh2.d has to do.
It's deh.d or rather deh_win32./ deh_win64_posix.d and it doesn't look
like _all_ that lot especially if you have no finally blocks and the
only catch is the top-most catch-all.
After all error codes would also have to propagate up the same call
stack depth.
--
Dmitry Olshansky
