Message157861
| Author |
skrah |
| Recipients |
loewis, mark.dickinson, pitrou, skrah |
| Date |
2012年04月09日.16:54:38 |
| SpamBayes Score |
-1.0 |
| Marked as misclassified |
Yes |
| Message-id |
<20120409165437.GA11934@sleipnir.bytereef.org> |
| In-reply-to |
<1333988067.75.0.775317539337.issue14520@psf.upfronthosting.co.za> |
| Content |
Mark Dickinson <report@bugs.python.org> wrote:
> In the C version of decimal, do distinct Decimal objects ever share coefficients?
The coefficients are members of the mpd_t struct (libmpdec data type),
and they are not exposed as Python objects or shared.
Cache locality is incredibly important: I have a patch that reserves
a static coefficient of four words inside the PyDecObject. This patch
speeds up _decimal by roughly another 30-40% for regularly sized decimals.
If the decimal grows beyond that, libmpdec automatically switches to
a dynamically allocated coefficient.
I think sharing would probably slow things down a bit. |
|