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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: | Martin C. Martin (mar...@martincmartin.com) | |
| Date: | Feb 27, 2008 12:18:45 pm | |
| List: | org.codehaus.groovy.dev | |
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.
That's true if there isn't a single function call (including property access) in the loop. As soon as you call a function which accepts one of your objects as an argument, or which could somehow grab your binding and meddle with it, this optimization is no longer possible. I suppose it would still be possible if you could prove that the function doesn't modify the metaclass at compile time, and note this along with the function. Then at runtime, when you resolve the call, you could see whether the invoked function could ever possibly change the metaclass.
Best, Martin
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