Technical architecture of large sites to read notes

• TSP: Number of transactions per second, a commonly used indicators throughput, a transaction is a client process sends a request to the server and then the server to respond. The client requests the transmission start timing, end timing after receiving the server response, in order to calculate the time of use and the number of transactions completed. reference
• HPS: HTTP requests per second
• QPS: the number of queries per second, is a number of queries the server per second is a measure of a particular query server within the specified time how much of the processing flow
• System Load: the system load, the sum of the number of processes currently being executed by the CPU and CPU waiting to be executed, is an important indicator of the extent of the reaction system is busy busy
• Anemia and congestive mode Mode
• Two main modes of resource reuse: Singleton (the Singleton) and Pooling (Object Pool)
• Caching memcached and redis