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Skip List vs. Binary Search Tree
...ormative graphs on pages 50, 53, and 54.
Locking skip lists are insanely fast. They scale incredibly well with the number of concurrent accesses. This is what makes skip lists special, other lock based data structures tend to croak under pressure.
Lock-free skip lists are consistently faster tha...
How can I pair socks from a pile efficiently?
...need order; we just need equality groups.
So hashing would be enough (and faster).
For each color of socks, form a pile. Iterate over all socks in your input basket and distribute them onto the color piles.
Iterate over each pile and distribute it by some other metric (e.g. pattern) into the seco...
How do I choose grid and block dimensions for CUDA kernels?
... sizes defined by the constraints above) can and does have a impact on how fast your code will run, but it depends on the hardware you have and the code you are running. By benchmarking, you will probably find that most non-trivial code has a "sweet spot" in the 128-512 threads per block range, but ...
ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
.... I recommend the
old software maxim: first make it
work, then make it fast. Don't worry
too much about optimization up front;
concentrate first on correctness. The
JVM implementation may be able to
perform buffer caching or other
optimizations that will give you the
performance you ...
Volatile vs. Interlocked vs. lock
...e, and you don't need to remember to lock elsewhere either. It's also very fast (as MSDN says, on modern CPUs, this is often literally a single CPU instruction).
I'm not entirely sure however if it gets around other CPUs reordering things, or if you also need to combine volatile with the increment....
Git pull results in extraneous “Merge branch” messages in commit log
...te, it will merge the new changes into your branch. And if it can’t do a fast-forward merge (if you have diverging commits), then it will create a merge commit.
– poke
Nov 15 '12 at 9:47
...
Are there good reasons not to use an ORM? [closed]
...ing and unmarshalling code supporting your SQL queries! This can get messy fast. On the other hand, you know how it works. You can debug it. It's all right there in your own persistence layer, not buried in the bowels of a 3rd party tool.
Hibernate could be a poster-child for Spolsky's Law of Leaky...
Timer function to provide time in nano seconds using C++
...amp;counter);
}
This function has also the advantage of being extremely fast - it usually takes no more than 50 cpu cycles to execute.
Using the Timing Figures:
If you need to translate the clock counts into true elapsed time, divide the results by your chip's clock speed. Remember that the "ra...
What does OSGi solve?
... only asks for a minimal Java VM to run and adds very little on top of it.
Fast - One of the primary responsibilities of the OSGi framework is loading the classes from bundles. In traditional Java, the JARs are completely visible and placed on a linear list. Searching a class requires searching thro...
How to declare global variables in Android?
...
}
}
class MyStateManager {
MyStateManager() {
/* this should be fast */
}
String getState() {
/* if necessary, perform blocking calls here */
/* make sure to deal with any multithreading/synchronicity issues */
...
return state;
}
}
class Blah extends Activity {
...