Condor-G - Your Window to the Grid

Miron LivnyComputer Sciences DepartmentUniversity of Wisconsin-Madison

[email protected]://www.cs.wisc.edu/~miron

Condor-G -Your Window

to the Grid

www.cs.wisc.edu/condor

The Condor Project (Established ‘85)

Distributed systems CS research performed by a team that faces

software engineering challenges in a UNIX/Linux/NT environment,

active interaction with users and collaborators, daily maintenance and support challenges of a

distributed production environment, and educating and training students.

Funding - NSF, NASA,DoE, DoD, IBM, INTEL, Microsoft and the UW Graduate School

.


National Grid Efforts

› National Technology Grid - NCSA Alliance (NSF-PACI)

› Information Power Grid (NASA)

› Particle Physics Data Grid (DoE)› Grid Physics Network (NSF-ITR)


Driving Concepts


“ … Since the early days of mankind the primary motivation for the establishment of communities has been the idea that by being part of an organized group the capabilities of an individual are improved. The great progress in the area of inter-computer communication led to the development of means by which stand-alone processing sub-systems can be integrated into multi-computer ‘communities’. … “

Miron Livny, “ Study of Load Balancing Algorithms for Decentralized Distributed Processing Systems.”, Ph.D thesis, July 1983.


Every Communityneeds a

Matchmaker!


Why? Because ...

.. someone has to bring together members of the community who have requests for goods and services with members who offer them. Both sides are looking for each other Both sides have constraints Both sides have preferences


High Throughput Computing

For many experimental scientists, scientific progress and quality of research are strongly linked to computing throughput. In other words, they are less concerned about instantaneous computing power. Instead, what matters to them is the amount of computing they can harness over a month or a year --- they measure computing power in units of scenarios per day, wind patterns per week, instructions sets per month, or crystal configurations per year.


HW is a Commodity

Raw computing power is everywhere - on desk-tops, shelves, and racks. It is cheap dynamic, distributively owned, heterogeneous and evolving.


Master-Worker (MW) computing is common and

Naturally Parallel.It is by no means

Embarrassingly Parallel.

Doing it right is by no means trivial.


The Tool


Our Answer to High Throughput MW Computingon commodity resources


The Condor System A High Throughput Computing system that supports

large dynamic MW applications on large collections of distributively owned resources developed, maintained and supported by the Condor Team at the University of Wisconsin - Madison since ‘86. Originally developed for UNIX workstations Based on matchmaking technology. Fully integrated NT version is available. Deployed world-wide by academia and industry. More than 1300 CPUs at the U of Wisconsin. Available at www.cs.wisc.edu/condor.


0

200

400

600

800

1000

1200

1400

'88 '94 '99 '00

Other

CS

Condor CPUs on the UW Campus


Some Numbers:UW-CS Pool

Total since 6/98 4,000,000 hours ~450 years“Real” Users 1,700,000 hours ~260 years

CS-Optimization 610,000 hoursCS-Architecture 350,000 hoursPhysics 245,000 hoursStatistics 80,000 hoursEngine Research Center 38,000 hoursMath 90,000 hoursCivil Engineering 27,000 hoursBusiness 970 hours

“External” Users 165,000 hours ~19 yearsMIT76,000 hoursCornell 38,000 hoursUCSD 38,000 hoursCalTech 18,000 hours


I have a job parallel MW application with

600 workers. How can I benefit from

Condor?


The Application …Study the behavior of F(x,y,z) for 20 values of x, 10 values of y and 3 values of z (20*10*3 = 600) F takes on the average 3 hours to compute

on a “typical” workstation (total = 1800 hours) F requires a “moderate” (128MB) amount of

memory F performs “little” I/O - (x,y,z) is 15 MB and

F(x,y,z) is 40 MB


Step I - get organized!› Turn your workstation into a “Personal

Condor”

› Write a script that creates 600 input files for each of the (x,y,z) combinations

› Submit a cluster of 600 jobs to your personal Condor

› Write a script that collects the data from the 600 output files

› Go on a long vacation … (2.5 months)


executable = workerrequirement = ((OS == “Linux2.2”) && Memory >=

128))rank = KFlopsinitialdir = worker_dir.$(process)

input = inoutput = outerror = errlog = log

queue 600

executable = workerrequirement = ((OS == “Linux2.2”) && Memory >=

128))rank = KFlopsinitialdir = worker_dir.$(process)

input = inoutput = outerror = errlog = log

queue 600

A Condor Job-Parallel Submit File


Your Personal Condor will ...

› ... keep an eye on your jobs and will keep you posted on their progress

› ... implement your policy on when the jobs can run on your workstation

› ... implement your policy on the execution order of the jobs

› .. add fault tolerance to your jobs

› … keep a log of your job activities


yourworkstation

personalCondor

600 Condorjobs


Resource

Local Resource Management

Owner Agent

Environment Agent

Customer Agent

Application Agent

Application

Condor Layers

Tasks

Jobs


Step II - build your personal Grid

› Install Condor on the desk-top machine next door.

› Install Condor on the machines in the class room.

› Install Condor on the O2K in the basement.

› Configure these machines to be part of your Condor pool.

› Go on a shorter vacation ...


yourworkstation

personalCondor

600 Condorjobs

GroupCondor


Step III - Take advantage of your

friends› Get permission from “friendly”

Condor pools to access their resources

› Configure your personal Condor to “flock” to these pools

› reconsider your vacation plans ...


yourworkstation

friendly Condor

personalCondor

600 Condorjobs

GroupCondor


Think big.

Go to the Grid


Condor-G

A Grid enabled version of Condor that uses the inter-domain services of Globus to bring Grid resources into the domain of your Personal-Condor

Supports Grid Universe jobs Uses GSIFTP to move glide-in software Uses MDS for submit information


Condor-glide-in

Enable an application to dynamically turn allocated grid resources into members of a Condor pool for the duration of the allocation.

Easy to use on different platforms Robust Supports SMPs


X509 Certificates

We are in the process of adding X509 based authentication capabilities to Condor services.

Job submission Local file access Access to Condor-glide-in software Resource authentication


GSIFTP

Enable Condor I/O services to use remote GSIFTP servers.

Move glide-in tar files Read executables Move Data from/to data repositories Access disk caches


Grid Universe

Grid Universe jobs submitted to Condor are transformed in the Globus jobs and submitted (via GlobusRun) to a grid resource.

Use MDS to locate resource Monitor status of job on remote resource Report status via Condor services Rewrite in progress with new Globus library.


Step IV - Think big (Grid)!

› Get access (account(s) + certificate(s)) to a “Computational” Grid

› Submit 599 “Grid Universe” Condor- glide-in jobs to your personal Condor

› Take the rest of the afternoon off ...


yourworkstation

friendly Condor

personalCondor

600 Condorjobs

Globus Grid

PBS LSF

Condor

GroupCondor

599 glide-ins


Does it work?


An example - NUG28 We are pleased to announce the exact solution of the nug28 quadratic assignment problem (QAP). This problem was derived from the well known nug30 problem using the distance matrix from a 4 by 7 grid, and the flow matrix from nug30 with the last 2 facilities deleted. This is to our knowledge the largest instance from the nugxx series ever provably solved to optimality.

The problem was solved using the branch-and-bound algorithm described in the paper "Solving quadratic assignment problems using convex quadratic programming relaxations," N.W. Brixius and K.M. Anstreicher. The computation was performed on a pool of workstations using the Condor high-throughput computing

system in a total wall time of approximately 4 days, 8 hours. During this time the number of active worker machines averaged

approximately 200. Machines from UW, UNM and (INFN) all participated in the computation.


NUG30 Personal Condor …

For the run we will be flocking to

-- the main Condor pool at Wisconsin (600 processors)

-- the Condor pool at Georgia Tech (190 Linux boxes)

-- the Condor pool at UNM (40 processors)

-- the Condor pool at Columbia (16 processors)

-- the Condor pool at Northwestern (12 processors)

-- the Condor pool at NCSA (65 processors)

-- the Condor pool at INFN (200 processors)

We will be using glide_in to access the Origin 2000 (through LSF ) at NCSA.

We will use "hobble_in" to access the Chiba City Linux cluster and Origin

2000 here at Argonne.


It works!!!Date: Thu, 8 Jun 2000 22:41:00 -0500 (CDT) From: Jeff Linderoth <[email protected]> To: Miron Livny <[email protected]> Subject: Re: Priority

This has been a great day for metacomputing! Everything is going wonderfully. We've had over 900 machines (currently around 890), and all the pieces are working great…

Date: Fri, 9 Jun 2000 11:41:11 -0500 (CDT) From: Jeff Linderoth <[email protected]>

Still rolling along. Over three billion nodes in about 1 day!


Up to a Point …

Date: Fri, 9 Jun 2000 14:35:11 -0500 (CDT) From: Jeff Linderoth <[email protected]> Hi Gang,

The glory days of metacomputing are over. Our job just crashed. I watched it happen right before my very eyes. It was what I was afraid of -- they just shut down denali, and losing all of those machines at once caused other connections to time out -- and the snowball effect had bad repercussions for the Schedd.


Back in Business

Date: Fri, 9 Jun 2000 18:55:59 -0500 (CDT) From: Jeff Linderoth <[email protected]>

Hi Gang,

We are back up and running. And, yes, it took me all afternoon to get it going again. There was a (brand new) bug in the QAP "read checkpoint" information that was making the master coredump. (Only with optimization level -O4). I was nearly reduced to tears, but with some supportive words from Jean-Pierre, I made it through.


The First 600K seconds …


The First 35K seconds …


We made it!!!

Sender: [email protected] Subject: Re: Let the festivities begin.

Hi dear Condor Team,

you all have been amazing. NUG30 required 10.9 years of

Condor Time. In just seven days !

More stats tomorrow !!! We are off celebrating !

condor rules !

cheers,

JP.


Do not bepicky, be

agile!!!

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Condor-G - Your Window to the Grid