Building a High-performance Web site (Revised edition) 2012.6P14 ' feedback mechanism ':--> small batch Continuous delivery must be global address. (You can use neighbor Routing + end-to-end Ibe) Electromagnetic velocity: 2.3*10^8 of electrical signals in copper wire, fiber about 2*10^8 (total reflection increases transmission distance) system load:/PROC/LOADAVG context switch: Nmon iowait (Note: Disk IO is serial.) ) Reduce system calls ... Zerocopy. Aio. Strace: Every request must be detected. htaccess. (Oh, set allowoverride All) memory allocation: Apache is a multi-process + memory pool (prefork mode, VS work/m2m mode), while Nginx is single process multithreading: 10,000 inactive HTTP connections only 2.5MB of memory Long connection: KeepAliveTimeout 30 (default 5s) ab-n10000-c100
- k http://... Process blocking View: strace-p <PID> This tool is good. Synchronous non-blocking I/O: generally only valid for network I/O, o_nonblock multiple ready I/O: 4.2 BSD Select Unix V3 poll Linux 2.4 Sigio Edge RIM triggers the Sun solaris/dev/poll/dev/epoll:+mmap (saves FD replication.) Linux 2.6 Epoll:epollet (Lighttpdx,nginx support) FreeBSD kqueue memory map strace:open--> mmap2--> Writev--> (for small files Better, large files with sendfile) are directly i/o:o_direct, such as the InnoDB engine used to asynchronous I/O (it seems that the bottom is using kernel thread, and there is no native implementation. The dynamic script Acceleration zend/zend_language_scanner.l <--eventually maps to a call to the C function, but it does not seem to be the same as JIT. The author's so-called opcode may be for PHP, for Java should be byte code (bytecode) Apc.cache_by_default = ON or use Xcache/eaccelerator (well, this time HHVM hasn't come out yet) XDebug Xdebug_time_index () xdebug_start_code_coverage (); <--。 This is how to implement the profiler:xdebug.profiler_ouput_dir/name=...%p Kcachegrind graphical way to view browser cache negotiation: Last_modified/etag Do not negotiate: Expires (depending on server-side time.) CACHE-CONTROL:MAX-AGE=30 Web Cache Reverse Proxy: Reverse nat (DNAT)--> server cluster nginx:proxy_pass Squid--> varnish:http response header increased via: ... Field VCL. WordPress: Turn off admin cookies settings ESI--> Ajax user ip:+ http_x_forwarded_for Web Component Detach Video: Throughput is meaningless, as long as download speed > bitrate Distributed Caching (memcached, abbreviated) Database performance optimization p270 memcachedb Web load Balancing Dynamic DNS (RFC2126) Ipvs:lvs-nat lvs-dr (configuration method slightly) Sharing file System (abbreviated) content distribution and synchronization WebDAV, rsync, Inotify+hash tree points Fabric file System (mogilefs, abbreviated) database extension master-slave copy read-write Separation (reverse proxy:
MySQL Proxy + LUA configuration<--good. This tool is very good. Vertical partition * Horizontal partition: Spock proxy (based on MySQL proxy) distributed computing: Gearman. Performance Monitoring (abbreviated)
