On Sat, Jan 2, 2010 at 7:17 AM, Nathan Parry <npa...@gmail.com> wrote:
> > > > > Jetty seems to do questionable things with filehandles, opening > > > > > multiple copies of the same template file and keeping them open too > > > > > long. Setting ulimit "fixes" the issue of "Too many open files" > > > > > exceptions & failed requests, but it still seems like at most > > > > > templates should need 1 access to check mtime. Not really a lift > > > > > issue, and not a deal breaker for us to switch to a different > servlet > > > > > container, but I am curious to see what the eventual solution for > > > > > comet performance is. > > > > > > If you can put together a reproducible case on this, we'll see what > we > > > can > > > > do to close stuff that Jetty hands us more explicitly. > > > > > I'm a total Lift and Scala newbie, but file-handle problems and last- > > > modified checks remind me of this bug in Facelets: > > > > >https://facelets.dev.java.net/issues/show_bug.cgi?id=278 > > > > Thanks. Looks like you found a defect and I've opened a defect. > > In case it is helpful, I think you can reproduce the behavior by doing > something like this: > > 1. mvn jetty:run > 2. Figure out the pid for jetty > 3. Figure out how many file descriptors are open after startup using: > lsof | grep <pid> | wc -l > 4. Run a command like the one copied below to request the same file > over and over. > 5. Run the lsof command line every few seconds to watch the FD count. > > Sample command to fetch a file in a loop: > > while (`true`); do curl -H "If-Modified-Since: Tue, 29 Dec 2009 > 20:02:16 UTC" -H "Cache-Control: max-age=0" > http://localhost:8080/classpath/blueprint/screen.css; > done > > Running this locally the FD count seems to fluctuate between the > baseline count and around 2x the baseline. I would guess that might > be based on how frequently the garbage collector is running and > cleaning up any connections that were not explicitly closed. > Nathan, Now don't take this the wrong way, but I could kiss you. ;-) This is a great defect report... it's led to: http://github.com/dpp/liftweb/issues/#issue/275 As well as a fix that I'm posting to review board right now. Thanks, David > > -- > Nathan > > -- > > You received this message because you are subscribed to the Google Groups > "Lift" group. > To post to this group, send email to lift...@googlegroups.com. > To unsubscribe from this group, send email to > liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/liftweb?hl=en. > > > -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics--
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