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