Dne 13.1.2015 v 14:02 Richard W.M. Jones napsal(a): > On Tue, Jan 13, 2015 at 01:31:06PM +0100, Sven Lankes wrote: >> On Tue, Jan 13, 2015 at 12:16:42PM +0000, Richard W.M. Jones wrote: >> >>> That's simply an idiotic thing to say. What is the progress involved >>> in adding a new BR to thousands of packages? >> Am I wrong assuming that it would be rather easy to add the BR to all >> packages semi-automatically previous to a mass rebuild so that people >> who want to get rid of gcc for their packages can easily remove it? >> >> What am I missing? > What is missing is there is no quantifcation yet of the benefit. > How much faster will builds be?
Since you are asking I did 5 times: $ mock -r minimal --scrub all && time mock -r minimal --init Where the "Total" is DNF's output of package download speed and amount of downloaded data obtained from mock output. Other DNF information are shown on top of each section as well. == with current minimal build root, i.e. "install @buildsys-build" Install 164 Packages Total download size: 119 M Installed size: 445 M 1) Total 26 MB/s | 119 MB 00:04 real 0m51.364s user 0m33.050s sys 0m6.454s 2) Total 13 MB/s | 119 MB 00:09 real 0m51.479s user 0m33.024s sys 0m3.400s 3) Total 19 MB/s | 119 MB 00:06 real 0m52.373s user 0m33.171s sys 0m7.121s 4) Total 21 MB/s | 119 MB 00:05 real 0m54.213s user 0m32.999s sys 0m7.122s 5) Total 13 MB/s | 119 MB 00:09 real 0m56.093s user 0m32.708s sys 0m5.745s == without gcc, gcc-c++ and make, i.e. "install rpm-build shadow-utils util-linux which" Install 153 Packages Total download size: 81 M Installed size: 350 M 1) Total 14 MB/s | 81 MB 00:05 real 0m49.789s user 0m28.926s sys 0m6.864s 2) Total 17 MB/s | 81 MB 00:04 real 0m44.010s user 0m28.965s sys 0m3.434s 3) Total 18 MB/s | 81 MB 00:04 real 0m45.860s user 0m29.032s sys 0m5.730s 4) Total 19 MB/s | 81 MB 00:04 real 0m42.047s user 0m28.944s sys 0m3.099s 5) Total 14 MB/s | 81 MB 00:05 real 0m47.079s user 0m29.839s sys 0m3.978s == without gcc, gcc-c++, make and without perl (rhbz#1158860, note that the rpm packages are local in this case), i.e. "install rpm-build shadow-utils util-linux which" Install 124 Packages Total size: 69 M Total download size: 68 M Installed size: 310 M 1) Total 11 MB/s | 68 MB 00:06 real 0m44.725s user 0m27.644s sys 0m6.126s 2) Total 12 MB/s | 68 MB 00:05 real 0m46.253s user 0m27.624s sys 0m7.056s 3) Total 6.5 MB/s | 68 MB 00:10 real 0m50.296s user 0m27.567s sys 0m6.064s 4) Total 12 MB/s | 68 MB 00:05 real 0m46.078s user 0m27.581s sys 0m7.698s 5) Total 16 MB/s | 68 MB 00:04 real 0m44.307s user 0m27.830s sys 0m5.293s == Only rpmbuild install "install rpm-build shadow-utils" Install 111 Packages Total size: 61 M Total download size: 60 M Installed size: 286 M 1) Total 20 MB/s | 60 MB 00:03 real 0m37.848s user 0m26.158s sys 0m2.676s 2) Total 13 MB/s | 60 MB 00:04 real 0m44.756s user 0m26.442s sys 0m5.185s 3) Total 16 MB/s | 60 MB 00:03 real 0m42.703s user 0m26.118s sys 0m3.174s 4) Total 13 MB/s | 60 MB 00:04 real 0m42.365s user 0m26.439s sys 0m4.193s 5) Total 5.9 MB/s | 60 MB 00:10 real 0m48.940s user 0m26.608s sys 0m4.576s == Minimal root I can shell in, i.e. "install bash shadow-utils" Install 48 Packages Total download size: 31 M Installed size: 176 M 1) Total 8.3 MB/s | 31 MB 00:03 real 0m36.745s user 0m22.019s sys 0m4.936s 2) Total 9.5 MB/s | 31 MB 00:03 real 0m32.608s user 0m21.805s sys 0m2.719s 3) Total 11 MB/s | 31 MB 00:02 real 0m34.111s user 0m22.170s sys 0m3.651s 4) Total 12 MB/s | 31 MB 00:02 real 0m41.141s user 0m22.595s sys 0m5.535s 5) Total 8.4 MB/s | 31 MB 00:03 real 0m34.303s user 0m21.851s sys 0m3.839s And several times during the test I encountered bug similar to: Downloading Packages: Error: Error downloading packages: Curl error: Failure when receiving data from the peer for ftp://mirror.slu.cz/fedora/linux/development/rawhide/x86_64/os/Packages/e/elfutils-libelf-0.161-1.fc22.x86_64.rpm [response reading failed] Less packages to download, less possible issues. You can interpret these data yourself, but with less packages in build root, I can see: 1) Saved build time 2) Saved network bandwidth 3) Saved storage 4) Less things to break > Versus how long will it take to > either modify all these packages / write and run the script to do > that? Is A > B? There are things which are hard to quantify. If you want to prohibit any change, this is probably right question to ask. Of course answering such questions also takes some time, I hope you will count it into the final equation at the end, although hard to say on which side it should belong. Vít
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