Why Events Are A Bad Idea (for high-concurrency servers)(usenix.org)

5 pointsby jparisevor 15 Jahren3 comments

Why Events Are A Bad Idea (for high-concurrency servers)

http://www.usenix.org/events/hotos03/tech/full_papers/vonbehren/vonbehren_html/

2 comments

prpatelvor 15 Jahren

"SEDA is a hybrid approach between events and threads, using events between stages and threads within them [17]. This approach is quite similar to the message-passing model discussed by Lauer and Needham [10], though Lauer and Needham advocate a single thread per stage in order to avoid synchronization within a stage. SEDA showed the value of keeping the server in its operating range, which it did by using explicit queues; we agree that the various queues for threads should be visible, as they enable better debugging and scheduling. In addition, the stage boundaries of SEDA provide a form of modularity that simplifies composition in the case of pipelines. When call/return patterns are used, such boundaries require stack ripping and are better implemented with threads using blocking calls."

The above is, IMO, the most important quote from the paper. Of course, this paper is from 2003, so I would like to think we have made some progress in understanding events vs/and/or threads, but I don't believe we really have.

simonwvor 15 Jahren

Previous discussions:

http://news.ycombinator.com/item?id=1269090

http://news.ycombinator.com/item?id=1355309

http://news.ycombinator.com/item?id=2907415

http://news.ycombinator.com/item?id=2910849

jparisevor 15 Jahren

Thanks. I should have done a more thorough search before submitting this. I was honestly surprised that this particularly link hadn't been posted before, and now we see that this paper has nearly a half-dozen URIs on the same site. Bummer.