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Why is creating a Thread said to be expensive?
...
System.out.printf("Time for a task to complete in a thread pool %.2f us%n", time / runs / 1000.0);
es.shutdown();
}
{
long start = System.nanoTime();
int runs = 200000;
for (int i = 0; i < runs; i++)
task.run();
for (int i = 0; ...
Is there a performance difference between i++ and ++i in C?
...i.s) = 90f620dda862cd0205cd5db1f2c8c06e
$ md5 *.o
MD5 (++i.o) = dd3ef1408d3a9e4287facccec53f7d22
MD5 (i++.o) = dd3ef1408d3a9e4287facccec53f7d22
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...
What does “zend_mm_heap corrupted” mean
...ena "client"
==9749==
==9749== Invalid write of size 2
==9749== at 0x4C2F7E3: memcpy@@GLIBC_2.14 (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9749== by 0x40061B: main (an.c:13)
==9749== Address 0x50 is not stack'd, malloc'd or (recently) free'd
==9749==
==9749==
==9749== Proc...
What does .SD stand for in data.table in R
... here are 16 visually distinct colors, taken from the list of 20 here:
# https://sashat.me/2017/01/11/list-of-20-simple-distinct-colors/
col16 = c('#e6194b', '#3cb44b', '#ffe119', '#0082c8', '#f58231', '#911eb4',
'#46f0f0', '#f032e6', '#d2f53c', '#fabebe', '#008080', '#e6beff',
...
Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
REST API Best practice: How to accept list of parameter values as input [closed]
... being URI encoded...
/Search?term=pumas&filters=%7B%22productType%22%3A%5B%22Clothing%22%2C%22Bags%22%5D%2C%22color%22%3A%5B%22Black%22%2C%22Red%22%5D%7D
Can be transformed to...
/Product?term=pumas&productType[]=Clothing&productType[]=Bags&color[]=Black&color[]=Red
Aside ...
Return multiple columns from pandas apply()
...ze_gb']] = df.apply(lambda x: sizes(x) , axis=1)
A general example from: https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.apply.html
df.apply(lambda x: pd.Series([1, 2], index=['foo', 'bar']), axis=1)
#foo bar
#0 1 2
#1 1 2
#2 1 2
...
What's the algorithm to calculate aspect ratio?
...d timing tests have been done by others, you can check one benchmark here: https://lemire.me/blog/2013/12/26/fastest-way-to-compute-the-greatest-common-divisor/)
Here is it:
/* the binary Great Common Divisor calculator */
function gcd (u, v) {
if (u === v) return u;
if (u === 0) re...
How to compute the similarity between two text documents?
...ut the similarity between them
import tensorflow_hub as hub
module_url = "https://tfhub.dev/google/universal-sentence-encoder/1?tf-hub-format=compressed"
# Import the Universal Sentence Encoder's TF Hub module
embed = hub.Module(module_url)
# sample text
messages = [
# Smartphones
"My phone is no...
multiprocessing: sharing a large read-only object between processes?
... created earlier in the program?"
No (python before 3.8), and Yes in 3.8 (https://docs.python.org/3/library/multiprocessing.shared_memory.html#module-multiprocessing.shared_memory)
Processes have independent memory space.
Solution 1
To make best use of a large structure with lots of workers, do ...