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Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...控最大连接数。
服务端还需要调整一下系统的参数，在/etc/sysctl.conf中：
net.core.somaxconn = 2048
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 4096 16777216 ...
记录一些Mac OS X技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...久生效的话，可以在~/.bash_profile、~/.bash_login、~/.profile或/etc/profile（需要管理员权限）里进行设置：
echo 'PS1="[\u@\h \W]\$ "' >> ~/.bash_profile
要修改主机名的话，可以打开“系统偏好设置”里的“共享”，然后编辑电脑名称。
快...
Linux下追踪程序退出(崩溃)思路 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...
历史命令默认会保存1000条，如果觉得太少，可以修改/etc/profile中HISTSIZE=1000，改成你想要的值。
注意：history只针对登录用户下执行有效，即使root用户也无法得到其它用户histotry历史。当然，还是有办法记录所有登陆用户的...
FTP/SFTP access to an Amazon S3 Bucket [closed]
...our security credentials in a form access-key-id:secret-access-key to /etc/passwd-s3fs
Add a bucket mounting entry to fstab:
<bucket> /mnt/<bucket> fuse.s3fs rw,nosuid,nodev,allow_other 0 0
For details, see my guide Setting up an SFTP access to Amazon S3.
Use S3 Client
Or use any...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...接赋值，还可以用语句给变量赋值，如：
for file in `ls /etc`
使用变量
使用一个定义过的变量，只要在变量名前面加美元符号即可，如：
your_name="qinjx"
echo $your_name
echo ${your_name}
变量名外面的花括号是可选的，加不加都行...
In Windows cmd, how do I prompt for user input and use the result in another command?
...ping? Like if you wanted to do a: set /p id=Enter ID:\r\n set /p pw=Enter Passwd: and didn't want the password text to show in the window, let alone, show in the "DosKey" command buffer? I've tried several different ways, and haven't been able to find a way to do this, outside of writing a little ...
C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
... Clients();//构造函数
virtual ~Clients();//析构函数
int GetClientCount();
bool PutClient(int sock,const struct sockaddr_in &clientAddr);
void RemoveClient(int sock);
bool GetAddrBySocket(int sock,struct sockaddr_in *addr);
bool PutName(int sock,const char *name, int...
Groovy executing shell commands
...ommand with env vars: envVars = ["P4PORT=p4server:2222", "P4USER=user", "P4PASSWD=pass", "P4CLIENT=p4workspace"]; workDir = new File("path"); cmd = "bash -c \"p4 change -o 1234\""; proc = cmd.execute(envVars, workDir);
– Noam Manos
Nov 5 '13 at 9:39
...
How to export and import a .sql file from command line with options? [duplicate]
... check and confirm: grant all privileges on *.* to root@"%" identified by "Passwd";
ERROR 2006 (HY000) at line 866: MySQL server has gone away
mysqldump: Got errno 32 on write
# set this values big enough on destination mysql server, like: max_allowed_packet=1024*1024*20
# use compress parameter ...
SSH to Vagrant box in Windows?
...: 127.0.0.1
Port: 2222
When you connect(Terminal Screen):
User: vagrant
Passwd: vagrant
Before you try to connect, verify your VM using cmd.exe:
vagrant status
If it is down use:
vagrant up
share
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