-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On Fri, 2020-07-24 at 13:29 -0600, Jeff Law wrote: > On Fri, 2020-07-24 at 19:12 +0000, Artem Tim wrote: > > Hi. In rare cases building packages with LTO producing binaries or > > libraries which have bigger size then if they have built without > > LTO. For example 'kitty' package: > > > > * with LTO: > > - koji task > > https://koji.fedoraproject.org/koji/taskinfo?taskID=47762998 > > 1.79 MB glfw-wayland.so > > 1.99 MB glfw-x11.so > > 4.78 MB fast_data_types.so > > 8.56 MB total > > > > * no LTO > > - koji > > https://koji.fedoraproject.org/koji/taskinfo?taskID=47769854 > > 1.65 MB glfw-wayland.so > > 1.84 MB glfw-x11.so > > 4.51 MB fast_data_types.so > > 8.00 MB total > > > > Difference is 7%. What we should do in such case? Should we disable > > LTO for such packages? Or there is still could be gains from faster > > code execution speed? > I'd tend to leave LTO on, but it's totally your call. Without > looking at the > binaries, sources and compiler dumps I'd hazard a guess you're > getting a lot of > cross module inlining, but very little identical code folding. THe > former tends > to make things bigger, but faster. The latter tends to shrink code > with little > impact on runtime performance. - From what I see in this case, -ffat-lto-objects generates code that is bigger than without -flto. -flto alone generates smaller code than without -flto. > Unfortunately comparing this stuff in an LTO world is much harder > than in a non- > LTO world. You can't just bisect it to a .o or function that's > larger :( > > > jeff > > > _______________________________________________ > devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: > https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx - -- Igor Raits <ignatenkobrain@xxxxxxxxxxxxxxxxx> -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEcwgJ58gsbV5f5dMcEV1auJxcHh4FAl8bQ2cACgkQEV1auJxc Hh4KkA/+LfGfZGjkZZcgJfgRYhVGdjpFpjdEjwTPQh/75IFnkd0q0BAJlHAxuvKA HQ0z/EQH5dfXIXtKYzg8+t+EHYjABPio+BSllNtv8OOAFW55TsRgxHCq/vDDjugU gM9urFXTvYnK8P52/EFMmZoIcg0PiLEMDArsoeUmHxzBDLSi4755HAsz/dz0VWxa BpJWWavTDHSFgkjMbqsrU/E9n/N0WdRdhaG1vuYEc80OLuQxGA9wSyT8fCOauGGZ 6qg2l93gHmQQys/V1PDOup2Dpjgr/GFEN3H0Q55UhdszXhfYKmipA0gS+rX7evyH jj9bYN+VMm8Qq9i7wmwPHsa88kYztozsx3vXYebpnuxgzG0uq1F+A2WoxkECtztc n5Ug0wUbYZSEBbpzxt7Tr9zaYoJ+TzdT8Ce+doub+P2fmnGO3Rhz87V0MGyiYcSG siBdnMBh26MwkQxRJkb5oR7WwCDmde2Rt7SmkVQuBI4sIUN418tif+bJUV+PMeMJ Q2hvqZryKeMHqGx7QmoUqSr5dMcZaY4zvMVbWggn2+qphNyI7gdc+QZMmtJ+5xeG ZpgKjMDofW8PWgD8Pn3ToeN/pyIzFFd17vvYY1sFD1ZpKE229T58eP6kWiMOnGyL j2/BI5UGjH0s+bhiUDLvfyVregBJRSxTptP975HLjjiP4GWUYN0= =taI4 -----END PGP SIGNATURE----- _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
