Introduction to Tornado: Modern Web Applications with Python
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Contents:
All this great work inspired me to innovate in one of the areas where Python is used extensively: web and micro-service development. Japronto is a brand new micro-framework tailored for your micro-services needs. Its main goals include being fast , scalable, and lightweight. It lets you do both synchronous and asynchronous programming thanks to asyncio. Even faster than NodeJS and Go. Despite of its inherently blocking design, it is a great performer compared to the preceding four, which are asynchronous Python solutions.
So never trust anyone who says that asynchronous systems are always speedier. These results were obtained on an AWS c4. The machine was running Ubuntu I used Python 3. To be fair, all the contestants including Go were running a single-worker process. Servers were load tested using wrk with 1 thread, connections, and 24 simultaneous pipelined requests per connection cumulative parallelism of requests. Most of the servers execute requests from pipelining clients in the same fashion they would from non-pipelining clients.
To ensure integrity of the communication, the server sends back several responses in the same order requests are received. Doing a system call and moving data from kernel-space to user-space is a very expensive operation compared to, say, moving memory inside process space. When Japronto receives data and successfully parses several requests out of it, it tries to execute all the requests as fast as possible, glue responses back in correct order, then write back in one system call.
Take care when you tune heuristics, and consider the cost of system calls and the expected request completion time. Besides delaying writes for pipelined clients, there are several other techniques that the code employs. Japronto is written almost entirely in C. The parser, protocol, connection reaper, router, request, and response objects are written as C extensions.
Japronto tries hard to delay creation of Python counterparts of its internal structures until asked explicitly. Japronto relies on the excellent picohttpparser C library for parsing status line, headers, and a chunked HTTP message body.
Introduction to Tornado
At the lowest level, this is a bridge to epoll system call providing asynchronous notifications on read-write readiness. You also get best practices for using Tornado in the real world. This book shows you why Tornado is fantastic choice for writing powerful applications that are simple to create, extend, and deploy. Developing Large Web Applications. Kyle Loudon. Axel Rauschmayer. How to Program with Java eBook. Trevor J Page. Advanced Python 3 Programming Techniques.
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