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Fast UNIX Servers: Difference between revisions
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===Multithreading Event Cores=== | ===Multithreading Event Cores=== | ||
We must mix and match: | |||
* Many event sources, of multiple types: | |||
** Socket descriptors, pipes | |||
** File descriptors referring to actual files (these usually have different blocking semantics) | |||
** Signals, perhaps being used for asynchronous I/O with descriptors (<tt>[[Linux APIs|signalfd(2)]]</tt> on Linux unifies these with socket descriptors; <tt>kqueue</tt> supports <tt>EVFILT_SIGNAL</tt> events) | |||
** Timers (<tt>[[Linux APIs|timerfd(2)]]</tt> on Linux unifies these with socket descriptors; <tt>kqueue</tt> supports EVFILT_TIMER</tt> events) | |||
** [[Pthreads|Condition variables]] becoming available | |||
* One or more event notifiers (<tt>epoll</tt> or <tt>kqueue</tt> fd) | |||
* One or more event vectors, into which notifiers dump events | |||
** <tt>kqueue</tt> supports vectorized registration of event changes, extending the issue | |||
* Threads | |||
Revision as of 01:58, 25 June 2009
Everyone ought start with Dan Kegel's classic site, "The C10K Problem" (still updated from time to time). Jeff Darcy's "High-Performance Server Architecture" is much of the same. Everything here is advanced followup material to these excellent works, and of course the books of W. Richard Stevens.
- "sendfile(): fairly sexy (nothing to do with ECN)" on lkml
- "mmap() sendfile()" on freebsd-hackers
- "sharing memory map between processes (same parent)" on comp.unix.programmer
- "some mmap observations compared to Linux 2.6/OpenBSD" on freebsd-hackers
- Stuart Cheshire's "Laws of Networkdynamics" and "It's the Latency, Stupid"
Queueing Theory
- "Introduction to Queueing"
- Leonard Kleinrock's peerless two-volume Queueing Systems
Event Cores
Multithreading Event Cores
We must mix and match:
- Many event sources, of multiple types:
- Socket descriptors, pipes
- File descriptors referring to actual files (these usually have different blocking semantics)
- Signals, perhaps being used for asynchronous I/O with descriptors (signalfd(2) on Linux unifies these with socket descriptors; kqueue supports EVFILT_SIGNAL events)
- Timers (timerfd(2) on Linux unifies these with socket descriptors; kqueue supports EVFILT_TIMER events)
- Condition variables becoming available
- One or more event notifiers (epoll or kqueue fd)
- One or more event vectors, into which notifiers dump events
- kqueue supports vectorized registration of event changes, extending the issue
- Threads
