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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...r cache thrashing, if I can coin a term.
Caches work by indexing with low order bits and tagging with high order bits.
Imaging that your cache has 4 words and your matrix is 4 x 4. When a column is accessed and the row is any power of two in length, then each column element in memory will map to t...
What is the difference between class and instance methods?
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@selytch "age" would have to be defined as a property in order to use synthetize.
– micah94
Jun 28 '14 at 15:56
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How to calculate the angle between a line and the horizontal axis?
...e will give 45.0 degrees for the example shown, which is wrong. Change the order of the deltaY calculation and it works properly.
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Is it a bad practice to use an if-statement without curly braces? [closed]
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The "rule" I follow is this:
If the "if" statement is testing in order to do something (I.E. call functions, configure variables etc.), use braces.
if($test)
{
doSomething();
}
This is because I feel you need to make it clear what functions are being called and where the flow of the...
load scripts asynchronously
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<img src="images/logo.png"/>
<img src="images/theme/contentBorder.png"/>
</body>
</html>
another nice thing about this is that I may place a loader in the page and when the page is done loading the loader will go away and in a matte of milliseconds the new page will ...
“Incorrect string value” when trying to insert UTF-8 into MySQL via JDBC?
...s affected (0.01 sec)
In short I had to reduce the size of that field in order to get the update to work.
Now when I run:
mysql> ALTER TABLE user CONVERT TO CHARACTER SET utf8mb4;
Query OK, 5 rows affected (0.01 sec)
Records: 5 Duplicates: 0 Warnings: 0
It all works
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How to make a website secured with https
... prepare my website for https. (Do I need to alter the code / Config)
In order to enable SSL (Secure Sockets Layer) for your website, you would need to set-up a certificate, code or config is not altered.
I have enabled SSL for an internal web-server, by using OpenSSL and ActivePerl from this onl...
How to get Resource Name from Resource id
...id of your View. It is not a simple text that you can get, split, etc.. In order to better help you, can you tell us what exactly do you need this text for?
– Dimitris Makris
Apr 13 '12 at 8:52
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c++ boost::multi_index composite keys efficiency - C/C++ - 清泛网 - 专注C/C++及内核技术
...he documentation states that "Composite keys are sorted by lexicographical order, i.e. sorting is performed by the first key, then the second key if the first one is equal, etc". Does this mean that the structure is stored such that a lookup for a specific 2-part composite key will take O(n=1) time,...
How can I include raw JSON in an object using Jackson?
...N inside a Java object when the object is (de)serialized using Jackson. In order to test this functionality, I wrote the following test:
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