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Expand a random range from 1–5 to 1–7
...s are exactly correct.
Also note that the numbers here get very big, very fast. Powers of 5 and 7 grow quickly. Hence, performance will start to degrade noticeably after generating lots of random numbers, due to bignum arithmetic. But remember here, my goal was to maximize the usage of random bi...
Secure hash and salt for PHP passwords
...rse still, most hash algorithms can be easily parallelized to perform even faster. This is why costly schemes like bcrypt and scrypt are so important.
You cannot possibly foresee all threats or avenues of attack, and so you must make your best effort to protect your users up front. If you do not, t...
Algorithm to find top 10 search terms
...his is important, because sorting and comparisons on integers is much much faster than on strings.
Archive Data
The system keeps archive data for every token. Basically it's pairs of (Token, Frequency). However, the table that stores the data would be so huge such that we have to partition the tab...
Why is Git better than Subversion?
...elopers are not always connected to the master repository. Also, it's much faster than SVN. And from what I hear, branching and merging support is a lot better (which is to be expected, as these are the core reasons it was written).
This also explains why it gains so much buzz on the Internet, as G...
Microsecond timing in JavaScript
...tain systems.
I have found that in modern GPU-accelerated web browsers on fast systems (e.g. i7 quad core, where several cores are idle, only browser window) -- I can now trust the timers to be millisecond-accurate. In fact, it's become so accurate on an idle i7 system, I've been able to reliably ...
What is Ember RunLoop and how does it work?
...//jsfiddle.net/jashkenas/CGSd5/ . Moral of the story: the RunLoop's really fast for most things you'd ever want to do in Ember, and it's where much of Ember's power lies, but if you find yourself wanting to animate 30 circles with Javascript at 60 frames per second, there might be better ways to go ...
Using Kafka as a (CQRS) Eventstore. Good idea?
... but more as high performance broker and buffer at the same time to handle fast producers versus slow consumers scenarios, for example.
Please look at eventuate.io microservices open source framework to discover more about the potential problems: http://eventuate.io/
Update as of 8th Feb 2018
I ...
“Keep Me Logged In” - the best approach
...nd = 50,000,000,000,000,000
So 50 quadrillion guesses per second. That's fast! Right?
time_to_guess = possibilities / guesses_per_second
time_to_guess = 3.4e38 / 50,000,000,000,000,000
time_to_guess = 6,800,000,000,000,000,000,000
So 6.8 sextillion seconds...
Let's try to bring that down to m...
Floating point vs integer calculations on modern hardware
... calculations for problems that are inherently floating point because "its faster". This causes a whole lot of annoying problems and adds a lot of annoying code.
...
std::wstring VS std::string
...processing should be done in a NON-multibyte-representation. It is simple, fast, easy.
add two utility functions to convert back & forth between UTF-8 and UCS-2:
UCS2String ConvertToUCS2( const UTF8String &str );
UTF8String ConvertToUTF8( const UCS2String &str );
The conversions are ...