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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...t launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这茬儿，所以问题的序幕就...
PHP json_encode encoding numbers as strings
...er":"test","ananother":456}
So, in this case, the integers have not been converted to string.
Still, this might be dependant of the version of PHP we are using : there have been a couple of json_encode related bugs corrected, depending on the version of PHP...
This test has been made with PHP 5...
PATH issue with pytest 'ImportError: No module named YadaYadaYada'
...s:
Add the path manually to the test files, something like this:
import sys, os
myPath = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, myPath + '/../')
Run the tests with the env var PYTHONPATH=../.
shar...
Double Negation in C++
...
It's a trick to convert to bool.
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Converting bool to text in C++
Maybe this is a dumb question, but is there any way to convert a boolean value to a string such that 1 turns to "true" and 0 turns to "false"? I could just use an if statement, but it would be nice to know if there is a way to do that with the language or standard libraries. Plus, I'm a pedant. :...
PadLeft function in T-SQL
... trick.
If your id or column is in a varchar and represents a number you convert first:
SELECT FORMAT(CONVERT(INT,id), '0000') FROM TableA
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When to use reinterpret_cast?
...you will know.
Full answer:
Let's consider basic number types.
When you convert for example int(12) to unsigned float (12.0f) your processor needs to invoke some calculations as both numbers has different bit representation. This is what static_cast stands for.
On the other hand, when you call r...
Get string character by index - Java
...rns s
If you're hellbent on having a string there are a couple of ways to convert a char to a string:
String mychar = Character.toString("mystring".charAt(2));
Or
String mychar = ""+"mystring".charAt(2);
Or even
String mychar = String.valueOf("mystring".charAt(2));
For example.
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Why don't Java's +=, -=, *=, /= compound assignment operators require casting?
...e beginner coming here, reading this, and going away thinking that you can convert any character from upper case to lower case by multiplying it by 1.5.
– Dawood ibn Kareem
May 28 '14 at 9:25
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How to identify whether a file is normal file or directory
...standard library, which provides an object oriented approach to handle filesystem paths. The relavant methods would be .is_file() and .is_dir():
In [1]: from pathlib import Path
In [2]: p = Path('/usr')
In [3]: p.is_file()
Out[3]: False
In [4]: p.is_dir()
Out[4]: True
In [5]: q = p / 'bin' / 'v...