Both comparisons will be compiled to machine instructions like BLT (branch on less than) or BLE (branch on less equal), which check some status bits like BLT: N-V + -NV (negative & not overflow or not negative and overflow) or BLE: Z + N-V + -NV (zero or negative & not overflow or not negative … Read more
Distributed Computing Economics written by Jim Gray in 2003 is a good start. See this quote: From this we conclude that one dollar equates to = 1 $ ≈ 1 GB sent over the WAN ≈ 10 Tops (tera cpu operations) ≈ 8 hours of cpu time ≈ 1 GB disk space ≈ 10 M … Read more
In big-O notation only the most significant term counts, and constant coefficients are ignored: O[n(n-1)/2] = O[n²/2 + n/2] = O[n²/2] = O(n²) 2 solved Why efficiency of selection sort or Bubble or Insertion sort is said to be n^2 and not as n(n-1)/2
I would strongly suggest to setup a pre-production environment and run load tests (with tools like JMeter) in conjunction with server-side monitoring. Tomcat backends can be monitored using the JMX protocol. You have 2 solutions : Free: JMeter with Perfmon Agent to monitor CPU, Memory and custom defined JMX Beans, Freemium (aka Paid for > … Read more
Try this: function flatten_array($data) { $newArray = array(); foreach ($data as $key => $value) { if (is_array($value)) { $newArray[] = ‘Start’ . $key; $newArray = array_merge($newArray,flatten_array($value)); $newArray[] = ‘End’ . $key; } else { $newArray[$key] = $value; } } return $newArray; } $flat = flatten_array($data); print_r($flat); output: Array ( [one] => one [0] => Starttwo … Read more
–Requete 40. Performance cost: 3% UPDATE #temp_arbo_of_3 SET PxAchat=NULL, CuTpsAch=NULL WHERE IdBE IS NULL; –Requete 41. Performance cost: 2% UPDATE #temp_arbo_of_3 SET CuTrait = NULL WHERE IdBE IS NOT NULL; –Requete 42. Performance cost: 2% UPDATE #temp_arbo_of_3 SET NrOF_Source = _ofI WHERE IdBE IS NOT NULL; Now if I replace all this by: –Requete 40. … Read more
ul a { font-size: 1.25rem } This is the best if you want to capture every anchor tag or any tag inside ul/ol tag But performance wise, ul { font-size: 1.25rem } this will be best. But if you want to modify the tag’s built in css property, like anchor’s color property, then you will … Read more
I made a great experience with Cython (Another thing than CPython…). You can make plain C code out of your program, compile it to an extension and just run it from another Python file. See this question from me for more information on building an extension including numpy: How to create a .pyd file?. Sample: … Read more
In the form you provided there is evident difference in complexity: the first code uses 3 operators, then the second — just one. But OK, lets put this code of and assume you want to compare > (or <) and == (!=). If you have ever faced assembler while examing your programs (but i bet … Read more
There is not going to really ever be a performance comparison to make here. Performance issues arise when something is happening multiple times per millisecond and they need to be optimized. That is not that case here. The information for the key is going to be coming from an event. Events are not caused very … Read more
The most efficient method is to read blocks or chunks of data into a buffer than scan the buffer. The I/O has an overhead cost and the more data you can fetch per request, the better. Searching in memory is always faster than reading one character at a time from the input. Be aware of … Read more
When you call cycle with the input value 113383, the process eventually sets n to 827370449, and 3*827370449+1 is 2482111348, which is greater than the maximum signed int and is interpreted as -1812855948. So there’s your first negative number where there should be no negative number. If this process then eventually sets n to -2, … Read more
So what is your problem? A HTML parser using CPU? What did you expect – the downloads do not, HTML parsing uses CPU, and if you use a lot of parallel threads then yes, this will add up. Not a lot you can do – optimize HtmlAgilityPack via a proviler to see whether or not … Read more
The many comments (and even answers) focus on the risks in your implementation. Yet the question stands. As directly demonstrated below rectifying the perceived code shortcomings would not change anything significant about the performance. Here is the OP’s code modified to be (A) safe, and (B) supporting the same operations as std::stack, and (C) reserving … Read more
You are recursing and you shouldn’t be using this form of nested setInterval. Doing this, will cause an explosion of interval instances. Instead of using setInterval, schedule additional requests using setTimeout. setInterval will fire and continue firing every interval until you tell it to stop. setTimeout will fire once. Let’s consider the following code which … Read more