I did create a patch for this: https://gem5-review.googlesource.com/c/public/gem5/+/44565. I _think_ this is the correct way to make LTO for .fast only. I won't submit until the community agrees this is the best course of action.
Kind regards, Bobby -- Dr. Bobby R. Bruce Room 2235, Kemper Hall, UC Davis Davis, CA, 95616 web: https://www.bobbybruce.net On Tue, Apr 20, 2021 at 5:07 PM Gabe Black via gem5-dev <gem5-dev@gem5.org> wrote: > I think that's reasonable. I didn't think the performance difference would > be as much as it is, since my machine has more cores than that, 12 with 2 > threads per core. It actually speeds up the build for people who have > enough cores which offset the extra work the linker has to do, but I > suspect those people are not the common case. We should still make it > possible to use a flag to enable LTO explicitly for a given build, so > basically switch the polarity of the default and the override flag. > > Gabe > > On Tue, Apr 20, 2021 at 7:54 AM Jason Lowe-Power via gem5-dev < > gem5-dev@gem5.org> wrote: > >> Hi all, >> >> It seems the recent change to enable LTO by default is causing more harm >> than good. Especially for people debugging, it's a large overhead to wait >> 2-5 minutes for gem5 to link in opt mode. I even have encountered this with >> a 6 core 3.5+GHz Ryzen. It's quite annoying. We've gotten at least 3 >> different posts on gem5-users and gem5-dev complaining about this. I think >> this is a strong sign we need to change something. >> >> I suggest *only enabling* LTO for fast builds and not for any other. >> >> Thoughts? >> >> Jason >> _______________________________________________ >> gem5-dev mailing list -- gem5-dev@gem5.org >> To unsubscribe send an email to gem5-dev-le...@gem5.org >> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s > > _______________________________________________ > gem5-dev mailing list -- gem5-dev@gem5.org > To unsubscribe send an email to gem5-dev-le...@gem5.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
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