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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
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The explanation comes from Agner Fog in Optimizing software in C++ and it reduces to how data is accessed and stored in the cache.
For terms and detailed info, see the wiki entry on caching, I'm gonna narrow it down here.
A cache is organized in sets and lines. At a time, only one set is u...
Shared-memory objects in multiprocessing
...r array), place that in shared memory, wrap it with multiprocessing.Array, and pass that to your functions. This answer shows how to do that.
If you want a writeable shared object, then you will need to wrap it with some kind of synchronization or locking. multiprocessing provides two methods of do...
cannot convert data (type interface {}) to type string: need type assertion
I am pretty new to go and I was playing with this notify package.
4 Answers
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Remove the bottom divider of an android ListView
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Just add
android:footerDividersEnabled="false"
to your ListView description
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CSS @font-face - what does “src: local('☺')” mean?
I'm using @font-face for the first time and downloaded a font-kit from fontsquirrel
3 Answers
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Is multiplication and division using shift operators in C actually faster?
Multiplication and division can be achieved using bit operators, for example
19 Answers
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parseInt vs unary plus, when to use which?
...ore like parseFloat since it also accepts decimals.
parseInt on the other hand stops parsing when it sees a non-numerical character, like the period that is intended to be a decimal point ..
+'2.3' === 2.3; //true
parseInt('2.3',10) === 2; //true
parseInt and parseFloat parses and bu...
Vim: Move window left/right?
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Ctrl w gives you the "windows command mode", allowing the following modifiers:
Ctrl w + R - To rotate windows up/left.
Ctrl w + r - To rotate windows down/right.
You can also use the "windows command mode" with navigation keys to change a window's positio...
The Concept of 'Hold space' and 'Pattern space' in sed
I'm confused by the two concepts in sed: hold space and pattern space. Can someone help explain them?
3 Answers
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Best practices for reducing Garbage Collector activity in Javascript
... the 'sawtooth' output from the Memory timeline in the Chrome dev tools) - and this often impacts the performance of the application.
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