Thanks for the update Thomas; I've converted your notes below into a mirage.io blog post so it's easier to reference to users; edits welcome on : https://github.com/mirage/mirage-www/pull/500
regards, Anil > On 17 Nov 2016, at 12:06, Thomas Gazagnaire <[email protected]> wrote: > > Hi all, > > I am in the process of releasing Irmin 0.12.0[1] which brings support for > native file-system watchers, to improve the performance of watches. > > Previously, an Irmin apps who wanted to use watches would set-up file-system > scanning/polling by doing: > > let () = Irmin_unix.install_dir_polling_listener 1. > > which would scan the `.git/refs` directory every second. This was working but > it was slow (if you are unlucky you might wait for 1s for the watch callbacks > to trigger) and disk/CPU intensive as we were scanning the full directory > every second to detect file changes: in case you have 1000s of tags, this > could easily saturate your CPU (in case you wonder, yes, we really have Git > repositories with 1000s of tags). > > In the 0.12.0 new world, you would do: > > let () = Irmin_unix.set_listen_dir_hook () > > and it will do "the right thing". E.g. if you are on linux, and have the > `inotify` package installed, it will use libinotify to get notified by the > kernel on every change and it will re-scan the whole directory. On OSX, if > you have the `osx-fsevents package installed, it will do the same thing using > OSX fsevents library. The portable compatibility layer between inotify and > fsevents comes with `irmin-watcher`[2] that I have just released as well. > > Best, > Thomas > > [1]: https://github.com/mirage/irmin/releases/tag/0.12.0 > [2]: https://github.com/samoht/irmin-watcher/releases/tag/0.2.0 > > CHANGES: > > Irmin 0.12.0 > > * Depends on irmin-watcher 0.2.0 to use portable file-system watches > (fsevents on OSX or inotify on Linux) to replace the slow and CPU > intensive file-system polling that was the default (#380, @samoht) > * Do not use `Lwt_unix.fork` in the tests anymore (#383, @samoht) > * Switch from Stringext to Astring (#382, @samoht) > * Fix regression in the tests for using Git over HTTP (#376, @samoht) > * Catch top-level exceptions in watch callbacks (#375, @samoht) > * Fix merge of assoc list with no common ancestor (#374, @samoht) > * Improve documentation for Git bare repositories (#363, @kayceesrk) > * New functor `Make_with_metadata` to customize the type of the > nodes metadata (#364, @samoht) > * Remove mentions of private modules from the public interface > (#364, @samoht) > > Irmin-watcher 0.2.0 > > - Allow to watch non-existing directories (#8, @samoht) > - Expose `Irmin_watches.stats` to get stats about the numbers > of active watchdogs, and callback dispatchers (#7, @samoht) > - When using fsevents/inotify do not scan the whole tree everytime > (#6, @samoht) > - Use realpath(3) on Linux and GetFullPathName on Windows to > normalise the path to watch (#6, @samoht) > - inotify: close the inotify file descriptor when stopping the > watch (#6. @samoht) > - inotify: fix the path of watched events (inotify uses relative > patch, unless fsevents which uses absolute paths) (#6, @samoht) > - fix detection of removed files (#6, @samoht) > > > > _______________________________________________ > MirageOS-devel mailing list > [email protected] > https://lists.xenproject.org/cgi-bin/mailman/listinfo/mirageos-devel _______________________________________________ MirageOS-devel mailing list [email protected] https://lists.xenproject.org/cgi-bin/mailman/listinfo/mirageos-devel
