Experimental, scalable, high performance HTTP server
In development for almost 3 years, Lwan was until now a personal research effort that focused mostly on building a solid infrastructure for a lightweight and speedy web server.
Lwan's
Features
- Low memory footprint (~500KiB for 10k idle connections)
- Minimal memory allocations & copies
- Minimal system calls
- Hand-crafted HTTP request parser
- Static file serving uses the most efficient way according to file size
- No copies between kernel and userland for files larger than 16KiB
- Smaller files are sent using vectored I/O
- Header overhead is considered before considering deflate compression
- Mostly wait-free multi-threaded design
- One thread accepts connections, one I/O thread per logical CPU handles them
- Hand-crafted coroutines makes asynchronous I/O a breeze in C
- Linux only, as it relies on epoll()
- Purpose-built I/O loop
- Efficient loading cache used for
- Directory listing
- File information (size, last modified date, MIME type, etc)
- Compressed files
- Diminute codebase with roughly 7200 lines of C code
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