On Mon, 18.05.15 18:24, cee1 (fykc...@gmail.com) wrote: > 2015-05-17 17:45 GMT+08:00 Martin Pitt <martin.p...@ubuntu.com>: > > Hello cee, > > > > cee1 [2015-05-16 0:46 +0800]: > >> Thanks for the suggestion, it was other processes running in parallel > >> which presumably consuming lots of IO, after sending SIGSTOP at the > >> first (and SIGCONT later), the unit loading time is decreased to > >> ~100ms. > > > > You probably want to use some readahead solution. We found that it > > makes a significant improvement on ARM boards with slow MMC cards. > > > > Martin > > -- > > Martin Pitt | http://www.piware.de > > Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org) > > Hey, > > Thanks for the suggestion, IIRC, sequential read is also beneficial > for flash storage. > > Does the readahead-*.service shipped with systemd work for you?
We removed the readahead logic from systemd a while back, since it had no maintainer, and nobody wanted to pick it up. > Question: > How does systemd schedule two services that can be launched in > parallel? It's not defined. systemd will fork things of in an undefined order if ther are multiple units runnable at the same time. As mentioned elsewhere, I'd be willing to merge a patchat that changes this and allows control of what service is forked off first, via some per-unit Priority= setting or so. Lennart -- Lennart Poettering, Red Hat _______________________________________________ systemd-devel mailing list email@example.com http://lists.freedesktop.org/mailman/listinfo/systemd-devel