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Optimise PostgreSQL for fast testing
...s as fsync=off without the giant data corruption risk. You do have a small window of loss of recent data if you enable async commit - but that's it.
If you have the option of slightly altering the DDL, you can also use UNLOGGED tables in Pg 9.1+ to completely avoid WAL logging and gain a real speed...
Image comparison - fast algorithm
...eat for all images in the database, and the match with the smallest result wins. You'd probably want to have a threshold, above which the algorithm concludes that no match was found.
Third Choice - Keypoints + Decision Trees
A third approach that is probably much faster than the other two is us...
Pointers vs. values in parameters and return values
...n find situations where copying even large structs turns out a performance win, but the rule of thumb is not to.
For slices, you don't need to pass a pointer to change elements of the array. io.Reader.Read(p []byte) changes the bytes of p, for instance. It's arguably a special case of "treat littl...
Mutex example / tutorial? [closed]
...le concurrently, we have potential for a race condition. Consider the following code
//somewhere long ago, we have i declared as int
void my_concurrently_called_function()
{
i++;
}
The internals of this function look so simple. It's only one statement. However, a typical pseudo-assembly languag...
Why do we use __init__ in Python classes?
...
class Brazilian(Humans)
def do_your_special_thing
win_every_football_world_cup()
class Germans(Humans)
def drink(beverage):
if favorite_drink != beverage: print "I need more beer"
else: print "Lecker!"
class HighSchoolStudent(Americ...
How do I get Windows to go as fast as Linux for compiling C++?
...
Unless a hardcore Windows systems hacker comes along, you're not going to get more than partisan comments (which I won't do) and speculation (which is what I'm going to try).
File system - You should try the same operations (including the di...
How to color System.out.println output? [duplicate]
...
Note
You may not be able to color Window's cmd prompt, but it should work in many unix (or unix-like) terminals.
Also, note that some terminals simply won't support some (if any) ANSI escape sequences and, especially, 24-bit colors.
Usage
Please refer to t...
Colors in JavaScript console
...
on my console it gets clipped on overflowing the line's height (Chrome 69, WIN7)
– vsync
Sep 18 '18 at 13:16
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Differences between Java 8 Date Time API (java.time) and Joda-Time
... LocalTime) and the composition (called LocalDateTime). That is a very big win compared with old java.util.Calendar and java.util.Date.
d) Both libraries use a method-centric approach meaning they encourage the user to use getDayOfYear() instead of get(DAY_OF_YEAR). This causes a lot of extra metho...
Is Unit Testing worth the effort? [closed]
...nagement of that, you gain credibility and perhaps have a better chance of winning them over.
share
edited Jan 5 '15 at 18:05
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