[Bug target/14563] new/delete much slower than malloc/free because of sjlj exceptions

["paulthomas2 at wanadoo dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From paulthomas2 at wanadoo dot fr  2004-11-13 11:02 -------
Subject: Re:  new/delete much slower than malloc/free because of sjlj exceptions

> Here's a test case for you...
>    -Ken

That's interesting....

Using your test case:
(i) gcc 3.2 20020927 ( prerelease) both versions take 0.62micro-sec/new
(ii) gcc 3.1.1 (cygming special) I get 2.1 and 0.66micro-sec/new
(iii) gcc 4.0.0 20041010 (experimental) I get 0.62 and 0.59micro-sec/new

This latter was a tad unexpected - I built in from a snapshot on one of the
German mirror sites.  Does this imply that I have picked up Dwarf2 as a
default?

Going back to the beginning of this rather long thread, you will note that
it was building octave that first exposed this problem.  I think that octave
is calling new too many times anyway, for certain types of code, and had
started hanging counters on an overloaded new operator.  It would not be a
big deal to substitute your version and to compare the performance with
THROW defined or not.

Give me a few days, the build takes a few hours under Cygwin and I have some
concreting to do this weekend.... *sigh*

Regards

Paul Thomas



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563