On 25 February 2018 at 12:30, Zbigniew Jędrzejewski-Szmek <zbyszek@xxxxxxxxx> wrote: > On Sun, Feb 25, 2018 at 01:19:24PM +0100, Florian Weimer wrote: >> On 02/25/2018 12:45 PM, Zbigniew Jędrzejewski-Szmek wrote: >> >>What's our current take on using LTO for Fedora package builds? >> >> >systemd would like to use it. >> >> Why? What are the benefits? > > There's a small change in size. When I tested recently it was ~7%, but > it was higher in the past. Fedora builds usually enable almost all optional > code, but if some parts are disabled (which happens also in RHEL), I think > the gains are bigger. > > Apart from that, we hope the code is faster, which is the usual > motivation for flto. BTW size. Did you try to compile systemd with optimisation for size (-Os)? There are many Linux packages which should be optimised for size because they provide binaries which are speed critical like boot loaders and boot tools (grub, lilo, gubby) some diagnostics and system tools (dmidecode, strace, parted, shadow-utils, util-linux, lvm, mdadm ..) In many cases optimisations for size provides faster code at it has lower probability generate CPU cache misses. kloczek -- Tomasz Kłoczko | LinkedIn: http://lnkd.in/FXPWxH _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
