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Command to get time in milliseconds
...ime.
$ time date +%s%N
1597103627N
date +%s%N 0.00s user 0.00s system 63% cpu 0.006 total
Python is still improving it's VM start time, and it is not as fast as ahead-of-time compiled code (such as date).
On my machine, it took about 30ms - 60ms (that is 5x-10x of 6ms taken by date)
$ time python ...
MySQL vs MongoDB 1000 reads
...very excited about MongoDb and have been testing it lately. I had a table called posts in MySQL with about 20 million records indexed only on a field called 'id'.
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Running the new Intel emulator for Android
...
I had the same issue, solved it by Installing the Intel Hardware Accelerated Execution Manager. Download it with the SDK Manager, it's in Extras. After this, go to the folder
[Android SDK Root]\extras\intel\Hardware_Accelerated_Execution_Manager
then run IntelHa...
Bash script to calculate time elapsed
....
%[p][l]R
The elapsed time in seconds.
%[p][l]U
The number of CPU seconds spent in user mode.
%[p][l]S
The number of CPU seconds spent in system mode.
%P
The CPU percentage, computed as (%U + %S) / %R.
The optional p is a digit specifying the precision, the number of frac...
How to delete duplicate lines in a file without sorting it in Unix?
... To save it in a file we can do this awk '!seen[$0]++' merge_all.txt > output.txt
– Akash Kandpal
Jul 19 '18 at 11:42
5
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How do I detect unsigned integer multiply overflow?
I was writing a program in C++ to find all solutions of a b = c , where a , b and c together use all the digits 0-9 exactly once. The program looped over values of a and b , and it ran a digit-counting routine each time on a , b and ab to check if the digits condition was satisfied.
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How to use PHP OPCache?
PHP 5.5 has been released and it features a new code caching module called OPCache, but there doesn't appear to be any documentation for it.
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What are the differences between json and simplejson Python modules?
...ossible.
A good practice, in my opinion, is to use one or the other as a fallback.
try:
import simplejson as json
except ImportError:
import json
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MFC的多国语言界面的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...） 通过点击菜单来测试软件的语言切换。
6. MessageBox的问题
由于MessageBox中的按钮的语言是跟操作系统相关的，要想实现MessageBox按钮的多语言化是很有一定难度的。我现在还没有查到好的解决方法，很多网友的建议是抛弃Messa...
What's better at freeing memory with PHP: unset() or $var = null
I realise the second one avoids the overhead of a function call ( update , is actually a language construct), but it would be interesting to know if one is better than the other. I have been using unset() for most of my coding, but I've recently looked through a few respectable classes found off t...