That's a great post Paddy, lots of the gore on the issue although I maybe don't totally agree on points 1 & 3. Most of process is trivial to virtualise, it's just an effort thing but you are right to point out the concern. But then maybe I am missing the point that your concern is over native modules getting inconsistent views of things shared in process? Signals I have not dealt with yet beyond noting the problem in libev with handling them on a non-default loop. I would think its fixable but haven't implemented it yet. > > The performance gains I am seeing are largely down to avoiding OS costs in synchronization. When I first profiled thread message passing it was quicker than the cluster version, by about x5 from memory, the bottleneck was the OS overhead of using an async send. I recoded to avoid entering the OS via atomics and the performance gain shot up as you would expect. Now I have always done this kind of optimization in threaded environments so I know the story, what I don't know of is can you reliably do this cross platform with process shared memory and if you wanted to how would you cope with the memory management aspects of that. If that was solvable then arguably threads don't make any sense, although they may still be the lesser of two evils from a pragmatic point of view.
I decided to pull my work off github as its as done as I needed it to be at this point and clearly there is little wider interest without a lead feature. I was always more interested in pushing on the shared storage which is why I got involved with threads to start with so I am setting off down that route. Kev -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
