. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 9.4.15 Scheduling tasks on event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 9.4.16 Tecla . . . . . . . . . . 203 10.2.3.2 Mount event triggered backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 10.2.3.3 Timer event triggered backup . . . . . . . . . . . . ficheiros que correspondem a alguma condição, ex. que corres- pondem ao modelo glob ”*.ext”. • Método for-loop da shell (veja Secção 12.1.4): for x in *.ext; do if [ -f ”$x”]; then command ”$x” ; fi; done •

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 9.4.15 Scheduling tasks on event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 9.4.16 Die . . . . . . . . . . 209 10.2.3.2 Mount event triggered backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 10.2.3.3 Timer event triggered backup . . . . . . . . . . . . Näheres in systemd.timer(5) . 9.4.15 Scheduling tasks on event Systemd can schedule program not only on the timer event but also on the mount event. See Abschnitt 10.2.3.3 and Abschnitt 10.2.3.2 for examples

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 2.1.8 The event flow of the package management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 perl(1) example, ”-i” is for the in-place editing of each target file, and ”-p” is for the implicit loop over all given files. Debian Reference 35 / 238 Tip Use of argument ”-i.bak” instead of ”-i” keeps List of script snippets for piping commands Debian Reference 37 / 238 A one-line shell script can loop over many files using find(1) and xargs(1) to perform quite complicated tasks. See Sec- tion 10.1

性能问题主要体现在不能有效使用多CPU • 对多个socket connection，在单线程里做event loop多路复用。 • 多个target时，如果挂的设备多，一旦客户端请求量大，就会忙不过来。 • 开源界有尝试修改 • 例如sheepdog的开发者提交过一个patch，但是测试效果不理想，分析 原因，event loop依然是瓶颈对TGT的性能优化 • IO是使用多个epoll 线程，充分发挥多CPU能力 params 都在主线程，而target epoll 线程也要使用这些数据，多线程冲突，数据一 致性问题就来了对TGT的性能优化（续) • 为每一个target增加一把锁 • Target event loop (TEL)线程和管理面线程使用这把锁互斥 • TEL在运行时锁住这把锁，管理面只能等待，等TEL线程进入epoll wait状 态，会释放这把锁，管理面可以增删改target信息。 •

renamed to MaxRequestWorkers, which describes more accurately what it does. For async MPMs, like event, the maximum number of clients is not equivalent than the number of worker threads. The old name is at compile time. The MPM of choice can be configured at run time via LoadModule directive. Event MPM The Event MPM is no longer experimental but is now fully supported. Asynchronous support Better support Apache, and can be easily added to the main server config. Graceful stop The prefork, worker and event MPMs now allow httpd to be shutdown gracefully via the graceful-stop signal. The GracefulShutdownTimeout

renamed to MaxRequestWorkers, which describes more accurately what it does. For async MPMs, like event, the maximum number of clients is not equivalent than the number of worker threads. The old name is at compile time. The MPM of choice can be configured at run time via LoadModule directive. Event MPM The Event MPM is no longer experimental but is now fully supported. Asynchronous support Better support Apache, and can be easily added to the main server config. Graceful stop The prefork, worker and event MPMs now allow httpd to be shutdown gracefully via the graceful-stop signal. The GracefulShutdownTimeout

renamed to MaxRequestWorkers, which describes more accurately what it does. For async MPMs, like event, the maximum number of clients is not equivalent than the number of worker threads. The old name is at compile time. The MPM of choice can be configured at run time via LoadModule directive. Event MPM The Event MPM is no longer experimental but is now fully supported. Asynchronous support Better support Apache, and can be easily added to the main server config. Graceful stop The prefork, worker and event MPMs now allow httpd to be shutdown gracefully via the graceful-stop signal. The GracefulShutdownTimeout

renamed to MaxRequestWorkers, which describes more accurately what it does. For async MPMs, like event, the maximum number of clients is not equivalent than the number of worker threads. The old name is at compile time. The MPM of choice can be configured at run time via LoadModule directive. Event MPM The Event MPM is no longer experimental but is now fully supported. Asynchronous support Better support Apache, and can be easily added to the main server config. Graceful stop The prefork, worker and event MPMs now allow httpd to be shutdown gracefully via the graceful-stop signal. The GracefulShutdownTimeout

renamed to MaxRequestWorkers, which describes more accurately what it does. For async MPMs, like event, the maximum number of clients is not equivalent than the number of worker threads. The old name is at compile time. The MPM of choice can be configured at run time via LoadModule directive. Event MPM The Event MPM is no longer experimental but is now fully supported. Asynchronous support Better support Apache, and can be easily added to the main server config. Graceful stop The prefork, worker and event MPMs now allow httpd to be shutdown gracefully via the graceful-stop signal. The GracefulShutdownTimeout

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889 10.120 Apache Module event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 899 10.121 Apache renamed to MAXREQUESTWORKERS, which describes more accurately what it does. For async MPMs, like EVENT, the maximum number of clients is not equivalent than the number of worker threads. The old name is loadable modules (p. 79) at compile time. The MPM of choice can be configured at run time. Event MPM The Event MPM (p. 899) is no longer experimental but is now fully supported. Asynchronous support Better