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Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
... mispredictions affect performance, take a look at this excellent answer: https://stackoverflow.com/a/11227902/1001643
Compilers typically don't have enough information to know which branches will alias and whether those aliases will be significant. However, that information can be determined at ...
MySQL - why not index every field?
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Easy idiomatic way to define Ordering for a simple case class
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How can I select rows with most recent timestamp for each key value?
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What is the purpose of std::make_pair vs the constructor of std::pair?
..._iterator.
See also:
Why not infer template parameter from constructor?
https://en.wikibooks.org/wiki/More_C++_Idioms/Object_Generator
Minimal example
To make things more concrete, we can observe the problem minimally with:
main.cpp
template <class MyType>
struct MyClass {
MyType i...
warning about too many open figures
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In log4j, does checking isDebugEnabled before logging improve performance?
...ava 8, you don't have to use isDebugEnabled() to improve the performance.
https://logging.apache.org/log4j/2.0/manual/api.html#Java_8_lambda_support_for_lazy_logging
import java.util.logging.Logger;
...
Logger.getLogger("hello").info(() -> "Hello " + name);
...
Non greedy (reluctant) regex matching in sed?
...hing for anything except the separator until the separator :
echo "http://www.suon.co.uk/product/1/7/3/" | sed -n 's;\(http://[^/]*\)/.*;\1;p'
Output:
http://www.suon.co.uk
this is:
don't output -n
search, match pattern, replace and print s/<pattern>/<replace>/p
use ; search comm...
npm - how to show the latest version of a package
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Explanation of JSONB introduced by PostgreSQL
...nted in
the database encoding but not in UTF8 will be allowed.
Source: https://www.postgresql.org/docs/current/datat