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Can not connect to local PostgreSQL
...
its taken some time to trawl through my directories and find the right files, but this was indeed the issue. Thanks for the very detailed answer. Once I'd found the correct directory, I needed to set the socket directory, data directory, hb...
How could the UNIX sort command sort a very large file?
...ry files while relatively small part of the problem is held in memory at a time). See Donald Knuth's The Art of Computer Programming, Vol. 3 Sorting and Searching, Section 5.4 for very in-depth discussion of the subject.
sha...
Calling a Method From a String With the Method's Name in Ruby
...t.method(:length)
n = 100000
Benchmark.bmbm {|x|
x.report("call") { n.times { m.call } }
x.report("send") { n.times { test.send(:length) } }
x.report("eval") { n.times { eval "test.length" } }
}
...as you can see, instantiating a method object is the fastest dynamic way in calling a m...
How to iterate through two lists in parallel?
...rinting and creating a new list, respectively, were investigated using the timeit() function where the number of repetitions used was 1000 times. One of the Python scripts that I had created to perform these investigations is given below. The sizes of the foo and bar lists had ranged from 10 to 1,00...
What really is a deque in STL?
... list, which would allow insertion and deletion from both ends in constant time, but I am troubled by the promise made by the operator [] to be done in constant time. In a linked list, arbitrary access should be O(n), right?
...
Is it better to reuse a StringBuilder in a loop?
... public static void main( String[] args ) throws Exception {
long time = System.currentTimeMillis();
for( int i = 0; i < 10000000; i++ ) {
StringBuilder sb = new StringBuilder();
sb.append( "someString" );
sb.append( "someString2"+i );
...
Add spaces before Capital Letters
...t[i]);
}
return newText.ToString();
}
Will do it 100,000 times in 2,968,750 ticks, the regex will take 25,000,000 ticks (and thats with the regex compiled).
It's better, for a given value of better (i.e. faster) however it's more code to maintain. "Better" is often compromise of c...
How can I convert tabs to spaces in every file of a directory?
...iles.
Downsides:
Will replace tabs everywhere in a file.
Will take a long time if you happen to have a 5GB SQL dump in this directory.
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Renaming files in a folder to sequential numbers
...s Great. Beauty in one line. I added ls -tr get the files by last modified time.
– Ranjith Siji
May 24 '16 at 7:20
37
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Why does Java's Arrays.sort method use two different sorting algorithms for different types?
...of primitives and merge sort for arrays of objects. I believe that most of time Quicksort is faster than merge sort and costs less memory. My experiments support that, although both algorithms are O(n log(n)). So why are different algorithms used for different types?
...