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How does LMAX's disruptor pattern work?
...as an extremely large array to take advantage of cache locality, eliminate allocation of new memory.
5 Answers
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Coding Practices which enable the compiler/optimizer to make a faster program
...if you care about performance. For example two-dimensional arrays in C are allocated in row-major format. Traversing arrays in column major format will tend to make you have more cache misses and make your program more memory bound than processor bound:
#define N 1000000;
int matrix[N][N] = { ... }...
What actually causes a Stack Overflow error? [duplicate]
...ve programs, when there is a risk of writing into memory that had not been allocated for the buffer, and thus to corrupt some other memory locations. It's not the case at all.
JVM has a given memory allocated for each stack of each thread, and if an attempt to call a method happens to fill this mem...
Is the pImpl idiom really used in practice?
... create a structure for the private objects of a class and dynamically allocate them to decrease the compilation time (and also hide the private implementations in a better manner).
...
Remove empty space before cells in UITableView
...his problem with code like this:
self.refreshControl = [[UIRefreshControl alloc] init];{
[self.refreshControl setAttributedTitle:[[NSAttributedString alloc]
initWithString:@"Your string"]];
[self.refreshControl addTarget:self
...
“Cloning” row or column vectors
...= 1000
>>> x = np.arange(n)
>>> reps = 10000
Zero-cost allocations
A view does not take any additional memory. Thus, these declarations are instantaneous:
# New axis
x[np.newaxis, ...]
# Broadcast to specific shape
np.broadcast_to(x, (reps, n))
Forced allocation
If you want...
What exactly are unmanaged resources?
...
Some users rank open files, db connections, allocated memory, bitmaps, file streams etc. among managed resources, others among unmanaged. So are they managed or unmanaged?
My opinion is, that the response is more complex: When you open file in .NET, you probably use s...
Reset C int array to zero : the fastest way?
...imized by hand.
memset(myarray, 0, sizeof(myarray)); // for automatically-allocated arrays
memset(myarray, 0, N*sizeof(*myarray)); // for heap-allocated arrays, where N is the number of elements
By the way, in C++ the idiomatic way would be to use std::fill (from <algorithm>):
std::fill(...
What are inline namespaces for?
...impl; // implementation class
template <class T> // e.g. w/o allocator argument
class vector : __vector_impl<T> { // private inheritance
// ...
};
}
#if __cplusplus >= 1997L // C++98/03 or later
// (ifdef'ed out b/c it p...
Case insensitive 'Contains(string)'
... >= 0? That uses the right culture and is case-insensitive, it doesn't allocate temporary lowercase strings, and it avoids the question of whether converting to lowercase and comparing is always the same as a case-insensitive comparison.
– Quartermeister
Ma...