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31 messages in org.codehaus.groovy.devRe: [groovy-dev] as usual on performa...| From | Sent On | Attachments |
|---|---|---|
| Alex Tkachman | Feb 27, 2008 5:38 am | |
| Guillaume Laforge | Feb 27, 2008 5:47 am | |
| Alex Tkachman | Feb 27, 2008 6:01 am | |
| Chanwit Kaewkasi | Feb 27, 2008 6:21 am | |
| Martin C. Martin | Feb 27, 2008 6:27 am | |
| Jochen Theodorou | Feb 27, 2008 6:32 am | |
| Jochen Theodorou | Feb 27, 2008 6:33 am | |
| tugwilson | Feb 27, 2008 6:55 am | |
| Chanwit Kaewkasi | Feb 27, 2008 7:15 am | |
| Chanwit Kaewkasi | Feb 27, 2008 8:01 am | |
| Jochen Theodorou | Feb 27, 2008 8:28 am | |
| tugwilson | Feb 27, 2008 9:00 am | |
| tugwilson | Feb 27, 2008 9:55 am | |
| Chanwit Kaewkasi | Feb 27, 2008 11:27 am | |
| Chanwit Kaewkasi | Feb 27, 2008 11:31 am | |
| Jochen Theodorou | Feb 27, 2008 11:36 am | |
| Alex Tkachman | Feb 27, 2008 11:58 am | |
| Martin C. Martin | Feb 27, 2008 12:18 pm | |
| Jochen Theodorou | Feb 27, 2008 12:37 pm | |
| Jochen Theodorou | Feb 27, 2008 12:45 pm | |
| tugwilson | Feb 27, 2008 12:48 pm | |
| tugwilson | Feb 27, 2008 12:51 pm | |
| Martin C. Martin | Feb 27, 2008 1:27 pm | |
| Alex Tkachman | Feb 27, 2008 1:48 pm | |
| tugwilson | Feb 27, 2008 2:14 pm | |
| Jochen Theodorou | Feb 27, 2008 5:09 pm | |
| Alexandru Popescu ☀ | Feb 27, 2008 5:38 pm | |
| Charles Oliver Nutter | Feb 28, 2008 12:20 am | |
| Jochen Theodorou | Feb 28, 2008 1:33 am | |
| Alexandru Popescu ☀ | Feb 28, 2008 2:56 am | |
| tugwilson | Feb 28, 2008 3:29 am |
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| Subject: | Re: [groovy-dev] as usual on performance - operations on primitives | Actions... |
|---|---|---|
| From: | Alex Tkachman (alex...@gmail.com) | |
| Date: | Feb 27, 2008 1:48:56 pm | |
| List: | org.codehaus.groovy.dev | |
ASs long as you sure that 'plus' doesn't change meta class
On Thu, Feb 28, 2008 at 12:27 AM, Martin C. Martin <mar...@martincmartin.com> wrote:
tugwilson wrote:
Jochen Theodorou wrote:
tugwilson schrieb: [...]
The main execution cost is fetching the MetaClass for b (Ng wraps ints in NgInt which has a getMetaClass method rather than Integer which requires a registry lookup), a check to see if a Category has changed the plus operation on int and a check that the plus operation on int has not been monkey patched. These costs are exactly equivalent to your "Integer#plus(Integer) is default" check, except the cost of getting the MetaClass for Integer is higher in Groovy.
well... theoretically it is enough to reuse that check for a certain amount of actions... for example:
int j=0; for (int i=0; i<n i++) { j+=i }
In this case we could check the MetaClass for Integer and if it is not modified, we could execute the code in its static form. This means for all n nest() calls and all n plus class we have only a single MetaClass check.
Checking outside the loop?
If so you're just deliberately breaking the semantics of the language.
I think Jochen's intention is to move a loop invariant outside the loop. The example is so simple and self contained that metaclasses can't change within the loop.
Moving a constant calculation outside a loop is a standard optimization which doesn't change the semantics; I don't think Jochen meant that all loops (or even most loops) could be handled that way.
Best, Martin
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