The NMI Build and Test Framework Peter F. Couvares Associate Researcher, Condor Team Computer Sciences Department University of Wisconsin-Madison pfc@cs. wisc. edu http: //www. cs. wisc. edu/condor
How Condor Got Started in the Build/Test Business: Prehistory › Oracle shamed^H^H^Hinspired us. › The Condor team was in the stone age, producing modern software to help people reliably automate their computing tasks -with our bare hands. • Every Condor release took weeks/months to do. • Build by hand on each platform, discover lots of bugs introduced since the last release, track them down, re-build, etc. www. cs. wisc. edu/condor
What Did Oracle Do? › Oracle selected Condor as the resource manager › › underneath their Automated Integration Management Environment (AIME) Decided to rely on Condor to perform automated build and regression testing of multiple components for Oracle's flagship Database Server product. Oracle chose Condor because they liked the maturity of Condor's core components. www. cs. wisc. edu/condor
Doh! › Oracle used distributed computing to automate › › › their build/test cycle, with huge success. If Oracle can do it, why can’t we? Use Condor to build Condor! NSF Middleware Initiative (NMI) • right initiative at the right time! • opportunity to collaborate with others to do for production software developers like Condor what Oracle was doing for themselves • important service to the scientific computing community www. cs. wisc. edu/condor
NMI Statement › Purpose – to develop, deploy and sustain a set of › reusable and expandable middleware functions that benefit many science and engineering applications in a networked environment Program encourages open source software development and development of middleware standards www. cs. wisc. edu/condor
Why should you care? From our experience, the functionality, robustness and maintainability of a production-quality software component depends on the effort involved in building, deploying and testing the component. • If it is true for a component, it is definitely true for a software stack • Doing it right is much harder than it appears from the outside • Most of us had very little experience in this area www. cs. wisc. edu/condor
Goals of the NMI Build & Test System › Design, develop and deploy a complete build › system (HW and SW) capable of performing daily builds and tests of a suite of disparate software packages on a heterogeneous (HW, OS, libraries, …) collection of platforms And make it: • • Dependable Traceable Manageable Portable Extensible Schedulable Distributed www. cs. wisc. edu/condor
The Build Challenge › Automation - “build the component at the push of a button!” • always more to it than just configure & make • e. g. , ssh to the “right” host; cvs checkout; untar; setenv, etc. › Reproducibility – “build the version we released 2 years ago!” • Well-managed & comprehensive source repository • Know your “externals” and keep them around › Portability – “build the component on node. X. cluster. net!” • No dependencies on magic “local” capabilities • Understand your hardware & software requirements › Manageability – “run the build daily on 20 platforms and email me the outcome!” www. cs. wisc. edu/condor
The Testing Challenge › All the same challenges as builds (automation, › reproducibility, portability, manageability), plus: Flexibility • “test our RHEL 4 binaries on RHEL 5!” • “run our new tests on our old binaries” • Important to decouple build & test functions • making tests just a part of a build -- instead of an independent step -- makes it difficult/impossible to: • run new tests against old builds • test one platform’s binaries on another platform • run different tests at different frequencies www. cs. wisc. edu/condor
“Eating Our Own Dogfood” › What Did We Do? • We built the NMI Build & Test Lab on top of Condor, DAGMan, and other distributed computing technologies to automate the build, deploy, and test cycle. • To support it, we’ve had to construct and manage a dedicated, heterogeneous distributed computing facility. • Opposite extreme from typical “cluster” -- instead of 1000’s of identical CPUs, we have a handful of CPUs for each of ~40 platforms. • Much harder to manage! You try finding a nifty system/network/cluster admin tool that works on 40 platforms! • We’re JABCU (just another big Condor user) • If Condor sucks, we feel the pain. www. cs. wisc. edu/condor
How does grid s/w help? › Build & Test jobs are a lot like scientific computing jobs. Same problems. . . › Resource management • • • Advertising machine capabilities (hw, OS, installed software, config, etc. ) Advertising job requirements (hw, OS, prereq software, config, etc. ) Matchmaking substitution -- replacing dynamic parameters in build (e. g. , available ports to use) with specifics of matched machine › Fault tolerance & reliable job results reporting! • • › never have to "babysit" a build or test to deal with external failures -- submit & forget until done, even if network does down or machine reboots garbage collection -- we never have to clean up processes or disk droppings after a misbehaving build DAGMan! • make dependencies explicit in a DAG, and get the same fault tolerance & reliability › Data management, file xfer, etc. • › › no shared filesystem! -- we need to make sure build/test node gets the files it needs from the submit machine, and gets the results back Authentication "gateway to the grid" -- grid resource access • in theory we can build/test on any remote grid using resources we don't manage (e. g. , ANL, OMII, SDSC, NCSA machines) www. cs. wisc. edu/condor
INPUT Spe c File NMI Build & Test Facility Distributed Build/Test Pool NMI Build & Test Software Condor Queue DAG Spec File Customer Source Code DAGM an results Customer Build/Test Scripts OUTPUT results Web Portal Finished Binaries My. SQL Results DB build/test jobs results
Numbers 100+ 40+ 34+ 9 3 ~100 ~1400 ~350 CPUs HW/OS “Platforms” OS HW Arch Sites GB of results per day Builds/tests per month Condor jobs per day www. cs. wisc. edu/condor
Condor Build & Test › Automated Condor Builds • Two (sometimes three) separate Condor versions, each automatically built using NMI on 13 -17 platforms nightly • Stable, developer, special release branches › Automated Condor Tests • Each nightly build’s output becomes the input to a new NMI run of our full Condor test suite › Ad-Hoc Builds & Tests • Each Condor developer can use NMI to submit ad-hoc builds & tests of their experimental workspaces or CVS branches to any or all platforms www. cs. wisc. edu/condor
www. cs. wisc. edu/condor
More Condor Testing Work • Advanced Test Suite • Using binaries from each build, we deploy an entire self-contained Condor pool on each test machine • Runs a battery of Condor jobs and tests to verify critical features • Currently >150 distinct tests • each executed for each build, on each platform, for each release, every night • Flightworthy Initiative • Ensuring continued “core” Condor scalability, robustness • NSF funded, like NMI • Producing new tests all the time www. cs. wisc. edu/condor
NMI Build & Test Customers › NMI Build & Test Facility was built to › serve all NMI projects Who else is building and testing? • Globus • NMI Middleware Distribution • many “grid” tools, including Condor & Globus • Virtual Data Toolkit (VDT) for the Open Science Grid (OSG) • 40+ components • Soon Tera. Grid, NEESgrid, others… www. cs. wisc. edu/condor
Recent Experience: SRB Client › Storage Resource Broker (SRB) › work done by Wayne Schroeder @ SDSC › started gently; took a little while for Wayne to warm up to the system • ran into a few problems with bad matches before mastering how we use prereqs • Our challenge: better docs, better error messages • emailed Tolya with questions, Tolya responded “to shed some more general light on the system and help avoid or better debug such problems in the future” › soon he got pretty comfortable with the system • moved on to write his own glue scripts • expanded builds to 34 platforms (!) www. cs. wisc. edu/condor
Failure, failure… success!
SRB Client › But… couldn't get HP/UX build to work • at first we all thought it was a B&T system problem • once we looked closer Wayne realized that SRB in fact would not build there, so it was informative › Now with “one button” Wayne can test his SRB client build any time he wants, on 34 platforms, with no babysitting. www. cs. wisc. edu/condor
Build & Test Beyond NMI › We want to integrate with other, related software quality projects, and share build/test resources. . . • an international (US/Europe/China) federation of build/test grids… • Offer our tools as the foundation for other B&T systems • Leverage others’ work to improve out own B&T service www. cs. wisc. edu/condor
OMII-UK • Integrating software from multiple sources • • Established open-source projects Commissioned services & infrastructure • Deployment across multiple platforms • Verify interoperability between platforms & versions • Automatic Software Testing vital for the Grid • • • Build Testing – Cross platform builds Unit Testing – Local Verification of APIs Deployment Testing – Deploy & run package Distributed Testing – Cross domain operation Regression Testing – Compatibility between versions Stress Testing – Correct operation under real loads • Distributed Testbed • • Need a breadth & variety of resources not power Needs to be a managed resource – process www. cs. wisc. edu/condor
Next: ETICS Build system, software configuration, service infrastructure, dissemination, EGEE, g. Lite, project coord. NMI Build & Test Framework, Condor, distributed testing tools, service infrastructure Software configuration, service infrastructure, dissemination Web portals and tools, quality process, dissemination, DILIGENT Test methods and metrics, unit testing tools, EBIT www. cs. wisc. edu/condor
ETICS Project Goals › ETICS will provide a multi-platform environment for building › and testing middleware and applications for major European e-Science projects “Strong point is automation: of builds, of tests, of reporting, etc. The goal is to simplify life when managing complex software management tasks” • One button to generate finished package (e. g. , RPMs) for any chosen component › ETICS is developing a higher-level web service and DB to generate B&T jobs -- and use multiple, distributed NMI B&T Labs to execute & manage them • This work complements the existing NMI Build & Test system and is something we want to integrate & use to benefit other NMI users! www. cs. wisc. edu/condor
ETICS Web Interface www. cs. wisc. edu/condor
OMII-Japan • What They’re Doing • • “…provide service which can use on-demand autobuild and test systems for Grid middlewares on on-demand virtual cluster. Developers can build and test their software immediately by using our autobuild and test systems” Underlying B&T Infrastructure is NMI Build & Test Software www. cs. wisc. edu/condor
This was a Lot of Work… But It Got Easier Each Time › Deployments of the NMI B&T Software › with international collaborators taught us how to export Build & Test as a service. Tolya Karp: International B&T Hero • Improved (i. e. , wrote) NMI install scripts • Improved configuration process • Debugged and solved a myriad of details that didn’t work in new environments www. cs. wisc. edu/condor
What We Don’t Do Well › Documentation • much better than ~6 months ago, but still incomplete • most existing users were walked through the system in person, and given lots of support • Submission/Specification API • we’re living comfortably in the 80’s: all command -line, all the time • we hope ETICS will improve this! www. cs. wisc. edu/condor
New Condor+NMI Users › Yahoo • First industrial user to deploy NMI B&T Framework to build/test custom Condor contributions › Hartford Financial • Deploying it as we speak… www. cs. wisc. edu/condor
What’s to Come › More US & international collaborations • More Industrial User/Developers… › New Features • Becky Gietzel: parallel testing! • Major new feature: multiple co-scheduled resources for individual tests • Going beyond multi-platform testing to cross-platform parallel testing › UW-Madison B&T Lab: ever more platforms • “it’s time to make the doughnuts” • Questions? www. cs. wisc. edu/condor
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