A few small comments/questions inline ... On Sun, 29 Dec 2019 at 07:23, Michael Albinus wrote: > Peter Ludemann writes: > > Hi Peter, > > >> In bug#33194, a patch for Emacs 27.0.50 is mentioned. Do you have a > >> chance to run this for test? > > > > Emacs 27.0.50 somewhat fixes the problem with global-auto-revert-mode, > > using the same desktop file (and same open files) that was causing > > problems with Emacs 26.3. (Sorry I took so long to test this.) > > Thanks for the feedback, the fix in Emacs 27 seems to work. > Correction: Emacs 28.05, cloned from git://git.sv.gnu.org/emacs.git and built using the instructions at https://www.emacswiki.org/emacs/EmacsSnapshotAndDebian#toc3 > > Emacs CPU utilization is now ~30-80% (according to top(1)) instead of > > 100%; and responsiveness is good. Of course, it would be nicer if > > emacs CPU utilization were less, so that I could fully utilize that > > core (I only have 4 cores, so losing half a core is notable on large > > tests). > > If I count correctly, your desktop file contains 489 buffers. Heavy load > for global-auto-revert-mode. > This is the result of working on a project for several months (using emacs-daemon). For example, 94 of those files are from Python and SWI-Prolog standard libraries, because I needed to get implementation details ("use the source, Luke"); and I'm using pieces from about 5 packages, whose source I also need to look at. So, it's a little sloppy, but not unreasonable, I think. > > > Michael Albinus - you had a number of other questions ... do you still > > want them (or some of them) answered? > > No, I don't believe so. > > > PS: Here's the desktop file, in case that can give some clue as to > > what file or directory is causing problems. The "compilation" > > processes both input from and output into /tmp/pykythe_test -- as you > > can see, there are a couple of open files from that directory, but > > they're not being continuously updated, only once or twice per test. > > auto-revert watches directories. Even if you watch only some few files > in a directory (I count 29 buffers which are bound to "/tmp"), there > will be lot of file notification events when other files in that > directory are changed. Maybe it helps to set auto-revert-use-notify to > nil for those files? You could do it via directory-local variales, as in > If I understand you correctly, Emacs doesn't watch individual files but instead watches the directories that those files are in ... if a file changes, then the directory will be changed with the file is written/closed. Is this a correct understanding? (Presumably the reason for this is that if files /path/to/dir/A, /path/to/dir/B, /path/to/dir/C are open in buffers, it suffices to only watch for changes to /path/to/dir; and if /path/to/dir/D is opened, no change to the watch list is needed.) > > (dir-locals-set-class-variables 'auto-revert-with-polling > '((nil . ((auto-revert-use-notify . nil))))) > > (dir-locals-set-directory-class > "/tmp/" 'auto-revert-with-polling) > > (This is untested.) > I haven't tested this because emacs 28.05 gives me adequate performance and I can live with turning global-auto-revert on/off when I do a big test (turning it off makes the test run a bit faster because there's another 0.5 CPU available for the test). Thanks again! - peter > > best, > > - peter > > Best regards, Michael. >