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package main

import (
	"errors"
	"fmt"
	"strings"
)

var ErrInvalidFruit = errors.New("invalid fruit")

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package main

import (
	"container/heap"
	"fmt"
	"math/rand"
	"time"
)

const nRequester = 100

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linux查看httpd进程数

ps -ef | grep httpd | wc -l

查看Apache的并发请求数及其TCP连接状态

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

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Git Submodules basic explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of advantages of using submodules:

• You can separate the code into different repositories.

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PdfLatex is a tool that converts Latex sources into PDF. This is specifically very important for researchers, as they use it to publish their findings. It could be installed very easily using Linux terminal, though this seems an annoying task on Windows. Installation commands are given below.

• Install the TexLive base

sudo apt-get install texlive-latex-base

• Also install the recommended and extra fonts to avoid running into the error [1], when trying to use pdflatex on latex files with more fonts.

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node {
    echo 'Results included as an inline comment exactly how they are returned as of Jenkins 2.121, with $BUILD_NUMBER = 1'
    echo 'No quotes, pipeline command in single quotes'
    sh 'echo $BUILD_NUMBER' // 1
    echo 'Double quotes are silently dropped'
    sh 'echo "$BUILD_NUMBER"' // 1
    echo 'Even escaped with a single backslash they are dropped'
    sh 'echo \"$BUILD_NUMBER\"' // 1
    echo 'Using two backslashes, the quotes are preserved'
    sh 'echo \\"$BUILD_NUMBER\\"' // "1"

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2018-04-18 21:38:53:301 - info: [HTTP] <-- POST /wd/hub/session/40dd06a7-e027-4067-8c2a-4e525a939d2b/element/27ea5535-3287-451e-be07-26cfec63b344/click 200 1143 ms - 76 
2018-04-18 21:38:53:310 - info: [HTTP] --> POST /wd/hub/session/40dd06a7-e027-4067-8c2a-4e525a939d2b/element {"using":"xpath","sessionId":"40dd06a7-e027-4067-8c2a-4e525a939d2b","value":"//android.widget.TimePicker//android.widget.NumberPicker[1]"}
2018-04-18 21:38:53:311 - info: [debug] [MJSONWP] Calling AppiumDriver.findElement() with args: ["xpath","//android.widget.TimePicker//android.widget.NumberPicker[1]","40dd06a7-e027-4067-8c2a-4e525a939d2b"]
2018-04-18 21:38:53:312 - info: [debug] [BaseDriver] Valid locator strategies for this request: xpath, id, class name, accessibility id, -android uiautomator
2018-04-18 21:38:53:313 - info: [debug] [BaseDriver] Valid locator strategies for this request: xpath, id, class name, accessibility id, -android uiautomator
2018-04-18 21:38:53:313 - info: [debug] [BaseDriver] Waiting up to 0 ms for conditi

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2018-04-17 14:34:51:700 - info: [HTTP] --> POST /wd/hub/session/03aea446-d813-420d-ae05-01290fd38ff6/element {"using":"id","sessionId":"03aea446-d813-420d-ae05-01290fd38ff6","value":"com.app.app:id/ib_captor_bottom_setting"}
2018-04-17 14:34:51:700 - info: [debug] [MJSONWP] Calling AppiumDriver.findElement() with args: ["id","com.app.app:id/ib_captor_bottom_setting","03aea446-d813-420d-ae05-01290fd38ff6"]
2018-04-17 14:34:51:701 - info: [debug] [BaseDriver] Valid locator strategies for this request: xpath, id, class name, accessibility id, -android uiautomator
2018-04-17 14:34:51:701 - info: [debug] [BaseDriver] Valid locator strategies for this request: xpath, id, class name, accessibility id, -android uiautomator
2018-04-17 14:34:51:701 - info: [debug] [BaseDriver] Waiting up to 0 ms for condition
2018-04-17 14:34:51:701 - info: [debug] [JSONWP Proxy] Proxying [POST /element] to [POST http://localhost:8200/wd/hub/session/1ce7e3aa-99e6-4699-ba9c-313fe34fa87d/element] with body: {"strategy":"id","selector":"c