On Wed, 28 Jun 2006 at 15:33 -0600, Barry Roberts wrote: > On Wed, Jun 28, 2006 at 03:14:52PM -0600, Hans Fugal wrote: > > > > I'm also not very good at enterprise-level performance testing/thinking, > > but I'll venture that insofar as rails is not hindered by the ruby > > threads implementation it's by working around the limitations. What are > > the limitations, exactly? > > Well, first, how do you use all the processors on a multiprocessor > system?
Yes, good point. As Jacob pointed out it's not really relevant for web serving, but good point. > > J2EE (and ASP.Net, I THINK) are heavily multi-threaded because it's > convenient. A request can come in to the container, and it can just > look up the associated session information and hand the request off to > any available thread since they share process memory. Since Java and > CLR use native threads, this automatically uses all the processors in > the machine. I do have lots to say about shared memory and parallel programming. Suffice it to say, the above is a very good argument against J2EE in my mind. > I guess rails could be tightly tied to APR shared memory that helps > apache modules work together even in different processes, but I doubt > that's the case. I don't know how rails ties to apache or if it does, > but I suspect it would be a real pain on Windows where the default MPM > is threaded. Rails mostly doesn't tie to apache. I use rails through lighttpd and fastcgi, going through apache first using mod_proxy. Again I don't think that shared memory is necessarily a good thing so I don't see this as a disadvantage. > I'm not saying threads are the only way to make a web-based framework > scalable (I was kinda hoping the rails folks had come up with > something clever). But they are handy enough that they seem to be > used quite often to make it easy to program in the stateless http > world. I propose that they did come up with something clever. It's called ActiveRecord. -- Hans Fugal ; http://hans.fugal.net There's nothing remarkable about it. All one has to do is hit the right keys at the right time and the instrument plays itself. -- Johann Sebastian Bach
signature.asc
Description: Digital signature
/* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
