yourchanges

TCP tuning

The most important TCP tuning areas since kernel 4.9 are:

packet pacing
dynamic TSO sizing
TCP small queues
BBR TCP congestion algorithm

Definitions

Gb = gigabit

High Traffic Server Settings on RHEL / AlmaLinux / Rocky / EuroLinux / CentOS 8

I recently did some work to optimize the network configuration of an AlmaLinux 8 based web server that receives a lot of traffic.

Of course these settings also apply to RHEL / Rocky / EuroLinux / CentOS 8 (hereafter referred to as Linux 8.) I think these should also work on RHEL / AlmaLinux / Rocky / EuroLinux 9 as well but I have not yet tested them.

There is a lot of information on the web for this and it distills down to a minimum recommended configuration, and a recommended configuration.

The minimum recommended configuration should be sufficient for servers with less than 10Gb, and the recommended configuration should be sufficient for servers with 10Gb or more.

使用ffmpeg合并MP4文件

ffmpeg -i "Apache Sqoop Tutorial Part 1.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "Apache Sqoop Tutorial Part 2.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "Apache Sqoop Tutorial Part 3.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.ts
ffmpeg -i "Apache Sqoop Tutorial Part 4.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate4.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts|intermediate4.ts" -c copy -bsf:a aac_adtstoasc "Apache Sqoop Tutorial.mp4"

替换上你的Email，密码，域名ID，记录ID等参数，就可以运行了。会在后台一直运行，每隔30秒检查一遍IP，如果修改了就更新IP。

获得domain_id可以用curl curl -k https://dnsapi.cn/Domain.List -d "login_email=xxx&login_password=xxx"

获得record_id类似 curl -k https://dnsapi.cn/Record.List -d "login_email=xxx&login_password=xxx&domain_id=xxx"

	pattern,cnt
	^,1657
	-$,376
	--,355
	root./file.\n,348
	(?m)^hello world,338
	\s+,296
	\s*,278
	^[a-z],275
	[cg]pu,245



	原文地址：http://in.sdo.com/?p=1707
	收集和整理了目前互联网上能找到的开源推荐系统，并附上了个人的一些简单点评（未必全面准确），这个列表是目前为止比较全面的了，希望对大家了解掌握推荐系统有帮助（文/陈运文）
	SVDFeature
	由上海交大的同学开发，采用C++语言，代码质量很高。去年我们参加KDD竞赛时用过，很好很方便，而且出自咱们国人之手，所以置顶推荐！
	项目地址：
	http://svdfeature.apexlab.org/wiki/Main_Page
	SVDFeature包含一个很灵活的Matrix Factorization推荐框架，能方便的实现SVD、SVD++等方法, 是单模型推荐算法中精度最高的一种。SVDFeature代码精炼，可以用相对较少的内存实现较大规模的单机版矩阵分解运算。
	另外含有Logistic regression的model，可以很方便的用来进行ensemble运算

	package main

	import (
	"bufio"
	"encoding/csv"
	"encoding/json"
	"fmt"
	"io"
	"os"
	"path/filepath"

	## Configure eth0
	#
	# vi /etc/sysconfig/network-scripts/ifcfg-eth0

	DEVICE="eth0"
	NM_CONTROLLED="yes"
	ONBOOT=yes
	HWADDR=A4:BA:DB:37:F1:04
	TYPE=Ethernet
	BOOTPROTO=static

	package main

	import (
	"github.com/AllenDang/w32"
	"io"
	"os"
	"unsafe"
	"errors"
	"fmt"
	"syscall"