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The performance impact of using instanceof in Java
...t is a little faster than doing an instanceof, but the difference my quick test found was 10-20ms over 10,000,000 iterations. If "object" isn't an ObjT, though, catching the exception was over 3000x slower - over 31,000ms vs ~10ms for the instanceof.
– Steve
Fe...
What is an initialization block?
...strate the use of them and in which order they are executed:
public class Test {
static int staticVariable;
int nonStaticVariable;
// Static initialization block:
// Runs once (when the class is initialized)
static {
System.out.println("Static initalization.");...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
...
I created a test suite, precisely to explore these issues (and more) (archived copy).
And in that sense, you can see the performance issues in this 50+ test case tester (it will take a long time).
Also as its name suggest, it explores ...
What happens when there's insufficient memory to throw an OutOfMemoryError?
...ems to be right: at least my JVM apparently re-uses OutOfMemoryErrors. To test this, I wrote a simple test program:
class OOMTest {
private static void test (OutOfMemoryError o) {
try {
for (int n = 1; true; n += n) {
int[] foo = new int[n];
}
...
How do you debug a regex? [closed]
...ly). As a consequence the display is unusable. In addition, the JavaScript testing hangs the browser with a lot of test cases, for every edition (not only once when fired). Finally, some of the proposed regexes are bugged and do not match as intended.
– 7heo.tk
...
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
I successfully implemented the OpenCV square-detection example in my test application, but now need to filter the output, because it's quite messy - or is my code wrong?
...
How to run `rails generate scaffold` when the model already exists?
... available to you.
Rails:
controller
generator
helper
integration_test
mailer
migration
model
observer
performance_test
plugin
resource
scaffold
scaffold_controller
session_migration
stylesheets
If you'd like to generate a controller scaffold for your model, see scaf...
Why is require_once so bad to use?
...t to your code if you're running *_once thousands of times.
<?php // test.php
$LIMIT = 1000000;
$start = microtime(true);
for ($i=0; $i<$LIMIT; $i++)
if (!defined('include.php')) {
require('include.php');
define('include.php', 1);
}
$mid = microtime(true);
for (...
How to select rows that have current day's timestamp?
...o show the difference that this makes on the actual execution plans, we'll test with an SQL-Fiddle (an extremely helpful site):
CREATE TABLE test --- simple table
( id INT NOT NULL AUTO_INCREMENT
,`timestamp` datetime --- index timestamp
, d...
Benchmarking small code samples in C#, can this implementation be improved?
...myself benchmarking small chunks of code to see which implemnetation is fastest.
11 Answers
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