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Is it good practice to use java.lang.String.intern()?
...t uses 4-5x less memory than rolling your own object pool
Be sure to tune -XX:StringTableSize (the default is probably too small; set a Prime number)
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Allowed characters in Linux environment variable names
...you are using docker, you can set variable in Dockerfile
FROM busybox
ENV xx.f%^&*()$#ff=1234
Kubernetes configmap
If you are using kubernetes, you can set variable by ConfigMap
test.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: foo-config
data:
"xx.ff-bar": "1234"
---
apiVers...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...
Standard C Preprocessor
$ cat xx.c
#define VARIABLE 3
#define PASTER(x,y) x ## _ ## y
#define EVALUATOR(x,y) PASTER(x,y)
#define NAME(fun) EVALUATOR(fun, VARIABLE)
extern void NAME(mine)(char *x);
$ gcc -E xx.c
# 1 "xx.c"
# 1 "<built-in>"
# 1 "<...
What's the correct way to sort Python `import x` and `from x import y` statements?
...m g import yy # changed gg->yy for illustrative purposes
import x
from xx import xx
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Logging best practices [closed]
...owing specific codes.
e.g. The first digit can detail the general class: 1xxx can be used for 'Start' operations, 2xxx for normal behaviour, 3xxx for activity tracing, 4xxx for warnings, 5xxx for errors, 8xxx for 'Stop' operations, 9xxx for fatal errors, etc.
The second digit can detail the area, ...
How do I write a correct micro-benchmark in Java?
...ral tens of thousands of inner loop iterations.)
Rule 2: Always run with -XX:+PrintCompilation, -verbose:gc, etc., so you can verify that the compiler and other parts of the JVM are not doing unexpected work during your timing phase.
Rule 2.1: Print messages at the beginning and end of timing and ...
How do I set the figure title and axes labels font size in Matplotlib?
...
‘xx-small’, ‘x-small’, ‘small’, ‘medium’, ‘large’, ‘x-large’, ‘xx-large’. See matplotlib.org/api/…
– tsando
Oct 11 '17 at 8:37
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vertical divider between two columns in bootstrap
...s also have some problems...
When you try to be clever/lazy and use col-XX-X class together with hidden-XX/visible-XX classes inside the same row element.
When you have a lot of columns and need a pixel perfect thing. Since it moves n-1 column 1px to the left.
... But on the other hand it's res...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...难问题，提供一致性级别判别与性能测试比较。
7、消息中间件（MQ）：
https://github.com/Tencent/TubeMQ TubeMQ是腾讯大数据在2013年开始研发的分布式消息中间件系统（MQ），专注服务大数据场景下海量数据的高性能存储和传输。...
Hidden features of Scala
...
As a illustration of the use consider the following source:
class A { "xx".r }
Compiling this with scalac -Xprint:typer outputs:
package <empty> {
class A extends java.lang.Object with ScalaObject {
def this(): A = {
A.super.this();
()
};
scala.this.Predef.augm...