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Further understanding setRetainInstance(true)
....MyActivity@405196b0
09-29 13:23:04.851: DEBUG/dalvikvm(4790): GC_EXTERNAL_ALLOC freed 49K, 51% free 2686K/5379K, external 0K/0K, paused 45ms
09-29 13:23:04.881: INFO/TESTING - MYACTIVITY(4790): onCreate - com.example.MyActivity@405196b0
09-29 13:23:04.881: INFO/TESTING - MYACTIVITY(4790): onStart -...
When to use volatile with multi threading?
...er and the first comment. "volatile is useless" is akin to "manual memory allocation is useless". If you can write a multithreaded program without volatile it is because you stood on the shoulders of people who used volatile to implement threading libraries.
– Ben Jackson
...
How does PHP 'foreach' actually work?
...ns is that 'FYFY' has the same hash as the removed element 'EzFY', and the allocator happens to reuse the same memory location to store the element. So foreach ends up directly jumping to the newly inserted element, thus short-cutting the loop.
Substituting the iterated entity during the loop
One ...
What is Node.js? [closed]
...like everyone else? In Node.js, a new connection is just a very small heap allocation. Spinning up a new process takes significantly more memory, a megabyte on some platforms. But the real cost is the overhead associated with context-switching. When you have 10^6 kernel threads, the kernel has to do...
Why is it slower to iterate over a small string than a small list?
...s just retrieves the result from a table of stored 1-character strings, so allocation costs for those are only incurred once.
– user2357112 supports Monica
May 26 '14 at 7:56
...
What are the underlying data structures used for Redis?
... dynamic string library so that we don't pay (asymptotically speaking) for allocations in append operations. This way we have O(N) appends, for instance, instead of having quadratic behavior.
Lists are implemented with linked lists.
Sets and Hashes are implemented with hash tables.
Sorted sets are i...
How to implement classic sorting algorithms in modern C++?
...ion to sort; their difference will tell the size of the array of counts to allocate. Then, a second pass through the collection is done to count the number of occurrences of every element. Finally, we write back the required number of every integer back to the original collection.
template<type...
data.table vs dplyr: can one do something well the other can't or does poorly?
...z=sum(z) * mul), by = .EACHI]
What is the advantage?
We don't have to allocate memory for the intermediate result.
We don't have to group/hash twice (one for aggregation and other for joining).
And more importantly, the operation what we wanted to perform is clear by looking at j in (2).
Chec...
How do you add an in-app purchase to an iOS application?
... product
SKProductsRequest *productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:kRemoveAdsProductIdentifier]];
productsRequest.delegate = self;
[productsRequest start];
}
else{
NSLog(@"User cannot make payments du...
Why does modern Perl avoid UTF-8 by default?
...lem
When you read data into Perl, it doesn't care what encoding it is. It allocates some memory and stashes the bytes away there. If you say print $str, it just blits those bytes out to your terminal, which is probably set to assume everything that is written to it is UTF-8, and your text shows up....