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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...lso using an additional thread. As you stated for best overall (system) performance I guess it would be better to use asynchronous I/O and not multiple threads (so reducing thread switching).
Let's look at possible implementations of a network server program that shall handle 1000 clients connected...
How is this fibonacci-function memoized?
...f the versions above are in fact independent of the outer n binding, to perform the lambda lifting after all, resulting in full memoization (except for the polymorphic definitions). In fact that's exactly what happens with all three versions when declared with monomorphic types and compiled with -O2...
How to turn on (literally) ALL of GCC's warnings?
...at's not usually useful is -Wtraditional, which warns about perfectly well formed code that has a different meaning (or doesn't work) in traditional C, e.g. "string " "concatenation", or ISO C function definitions! Do you really care about compatibility with 30 year old compilers? Do you really wan...
What is the best Battleship AI?
... Actually, this answer is nice because it shows in a very concise form the API's you'd need to implement to compete... :)
– dicroce
Oct 27 '09 at 15:51
1
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Java inner class and static nested class
...r class definition and its single instantiation into one convenient syntax form, and it would also be nice if we didn't have to think up a name for the class (the fewer unhelpful names your code contains, the better). An anonymous inner class allows both these things:
new *ParentClassName*(*constru...
What is the purpose of setting a key in data.table?
...operations, setkey() was never an absolute requirement. That is, we can perform a cold-by or adhoc-by.
## "cold" by
require(data.table)
DT <- data.table(x=rep(1:5, each=2), y=1:10)
DT[, mean(y), by=x] # no key is set, order of groups preserved in result
However, prior to v1.9.6, joins of the ...
WebSockets protocol vs HTTP
...on handshakes, but with a WebSocket connection the initial handshake is performed once and then small messages only have 6 bytes of overhead (2 for the header and 4 for the mask value). The latency overhead is not so much from the size of the headers, but from the logic to parse/handle/store those h...
How do I create a simple 'Hello World' module in Magento?
...er possible, try to use the model objects the system provides to get the information you need. I know it's all there in the SQL tables, but it's best not to think of grabbing data using raw SQL queries, or you'll go mad.
Final disclaimer. I've been using Magento for about two or three weeks, so cav...
Big O, how do you calculate/approximate it?
...takes my students a couple of months to finally grasp. You can find more information on the Chapter 2 of the Data Structures and Algorithms in Java book.
There is no mechanical procedure that can be used to get the BigOh.
As a "cookbook", to obtain the BigOh from a piece of code you first need t...
What does “dereferencing” a pointer mean?
...ases, or undergo zero initialisation (e.g. new T(); and new T(x, y, z); perform zero-initialisation on T's members including pointers, whereas new T; does not).
Further, when you assign 0, NULL and nullptr to a pointer the bits in the pointer are not necessarily all reset: the pointer may not conta...