distributed analysis scheme · 2016. 8. 30. · basic git workﬂow check out from remote: $ git...

Distributed Analysis Scheme SHI Xin (IHEP) 30 August 2016

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Distributed Analysis Scheme

SHI Xin (IHEP)

30 August 2016

Page 2: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

What is the problem?

From hardware to software to physics … everything is changing … fast!

For project leaders: hard to maintain stable team

For newcomers: hard to get involved in short time

Page 3: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

Lesson from Linux Distribution

Linux Distribution: Hundreds of distributions

Page Hit Ranking: Mint, Debian, Ubuntu …

Mint based on Ubuntu, Ubuntu based on Debian !

Page 4: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

Debian Develop ModelOrganization, lifecycle and package system

4https://en.wikipedia.org/wiki/Debian

> 50, 000 packages!

http://distrowatch.com/table.php?distribution=debian

https://en.wikipedia.org/wiki/Debian

Page 5: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

Semantic Versioning

Avoid “dependency hell” in software management

Semantic Versioning: http://semver.org

X.Y.Z = Major.Minor.Patch

Major: incompatible API changes

Minor: add backwards-compatible functionality

Patch: make backwards-compatible bug fixes

http://semver.org

Page 6: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

CEPC Software and Physics Analysis

Main CEPC Software: will be hosted https://github.com/cepc/cs

Physics Analysis Projects

Existing example: https://github.com/cepc/higgsrecoil (Thanks to Zhenxing!)

Requirements inside the package: setup.sh, build.sh, submit.sh; newcomers can reproduce the plots easily.

For developers: use “fork” and “pull-request” mode

https://github.com/cepc/cs

https://github.com/cepc/higgsrecoil

Page 7: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

Three levels of programing language

Core algorithm: C++

System level: python

User level: bash

Remember: the main goal of any “language” is for communication! One writes a piece of code not for himself, but for others to read as well! Unless one has strong reason, we suggest to use the following convention:

Always document well!

Page 8: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

backup

Page 9: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

github.com

Linux Kernel Source code (1.6GB) https://github.com/torvalds/linux

LHC: CMS core software (570MB)https://github.com/cms-sw/cmssw

1,780 forks / 510 contributors

http://github.com

https://github.com/torvalds/linux

https://github.com/cms-sw/cmssw

basic git workflow

Check out from remote: $ git clone remote.server/code.git

Update: $ git pull

Add file: $ git add abc.txt

Commit: $ git commit -m “comment message” abc.txt

Push to remote: $ git push10

fast local operation

Page 11: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

workflow in github.com

Fork the repo

Make your change / contribution

Push to your own repo (forked repo)

Create Pull Request

Get approved and merged to the official repo

CMS Example: HLT Photon + Jet in DQM code https://github.com/cms-sw/cmssw/pull/4946/

http://github.com

https://github.com/cms-sw/cmssw/pull/4946/

Page 12: Distributed Analysis Scheme · 2016. 8. 30. · basic git workﬂow Check out from remote: $ git clone remote.server/code.git Update: $ git pull Add ﬁle: $ git add abc.txt Commit:

Further info

Quick start: http://www.codeschool.com/courses/git-real

In-depth: ( )https://git-scm.com/book/zh/v2

http://www.codeschool.com/courses/git-real

https://git-scm.com/book/zh/v2

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