Effective HTCondor-based monitoring system

Justas Balcas, James Letts,

Farrukh Aftab Khan, Brian Bockelman

• 2 Collectors (FNAL, CERN)

• 2 Frontends (FNAL, CERN)

• 3 Negotiators (FNAL, CERN)

• 4 factories (CERN, FNAL, UCSD, GOC)

• CMS Drivers/Submission tools (Schedds):

  • Production (21)

  • Analysis (CRAB3) (7)

  • Analysis (CRAB2) (1)

  • CMS Connect (Plan in 2016) (1)                                        

One Pool To Rule Them All

Justas Balcas (CALTECH)

2016-03-01

Justas Balcas (CALTECH)

2016-03-01

Why is this needed?

• How much prod/analysis is running on 'Site X' and was running last hour, day, week?

• Why are my jobs not running?

• Why 'Site X' is saturated and not running anything?

• There are jobs imbalance between T2_US and T2_US_SiteX and why this is happening?

• Which sites are multicore ready?

• Etc...

Where I can find all of the information?

• All information you can get from: dashboard, wmstats, schedd, factory page, etc...
  • This takes time to investigate and know where to look and load information
  • Check logs of each component, several machines at once
  • condor_status -wide -af Name TotalRunningJobs
  • condor_q -const 'DESIRED_Sites=?="T2_US_SiteX"'
  • do 'grep … | cat … | sort | uniq -c'

Justas Balcas (CALTECH)

2016-03-01

Where I can find all of the information?

Justas Balcas (CALTECH)

2016-03-01

Can you debug my jobs which ran two days ago...?

Justas Balcas (CALTECH)

2016-03-01

http://cms-gwmsmon.cern.ch/

Justas Balcas (CALTECH)

2016-03-01

• Mar 14 - Initial prototype of production view
• Mar 16 - Finished prototype
• ----------
• May 08 - Added CRAB3 view (CRAB2 next day)
• Aug 03 - Totalview, ScheddView, Factoryview
• Aug 31 - Resource utilization
• Sep 03 - Pilot (Multicore/Single) usage in totalview per site
• Nov 10 - Bootstrap3 (For better mobile support)
• Jan 05 - Unique pressure per sites in all views
                 Production Priority
                 Support multiple collectors and reuse code in all views
                 Python2.7 + PEP8 friendly

Justas Balcas (CALTECH)

2016-03-01

Monitoring timeline

Implementation details

• Each view has an independent cronjob which runs every 3 minutes
• Running on VM: 4 VCPUs, 8GB RAM, 2 x High IO disks (500 IOPS, 200GB), 2 x Normal disks (120 IOPS, 200GB)
• Each view is preparing RRDs and json output for website

• HTCondor + HTCondor python bindings
• python-genshi
• httpd + mod_wsgi
• rrdtool-python
• Monitoring code: https://github.com/juztas/prodview/

Justas Balcas (CALTECH)

2016-03-01

• RequestMemory, MaxWallTimeMins, JobStatus, DESIRED_Sites, MATCH_EXP_JOBGLIDEIN_CMSSite, Qdate, JobPrio

• 3 different view canvases (For workflows & sub-workflows):

  • Main View Overview (Running, Idle, Graphs, Workflow Count, Last Update Time)

  • Workflow overview

  • Site overview

  • Debug information (Grouped Running&Idle with Equal Requirements)

•         Each view has different links for operators to get more information

Justas Balcas (CALTECH)

2016-03-01

Defaults for all (Prod, CRAB3, CRAB2)

Each task might have different subtasks, matching requirements (Memory, WallTime, CPUs, DESIRED_Sites), different priorities.

Justas Balcas (CALTECH)

2016-03-01

Production Overview

Justas Balcas (CALTECH)

2016-03-01

Analysis Overview (CRAB3/2)

• Since January, the number of CRAB3 jobs has increased from 10-15K to 30-40K parallel running jobs.
• This placed increased load on the pool central managers:
  • More collector ClassAd updates
  • Increased Negotiator cycle times (matchmaking between jobs and pilots)
• Also has strained ASO recently.

Justas Balcas (CALTECH)

2016-03-01

CRAB3 dashboard (Kibana)

CRAB3 schedds are monitored via a lemon sensor which fetches schedd statistics and publish them to ElasticSearch

We also do grep on shadow logs to get GLExec related errors

Justas Balcas (CALTECH)

2016-03-01

Total Overview

Justas Balcas (CALTECH)

2016-03-01

Pool Overview

• 4 factories in different continents
• Querying all 4 every 3 minutes
  +
  parsing 2 XMLs which they provide

Justas Balcas (CALTECH)

2016-03-01

Factory Overview

Usage(2015 Dec 10 - Yesterday)

Justas Balcas (CALTECH)

2016-03-01

• Show & Plot negotiation time for 3 negotiators
• Priority of the jobs for production per schedd
• Number of Dagmans per User/Schedd (HTCondor ticket 5519)
• Archiving the data (RRDs look like WEB1.0, but this website is used mostly for near real-time monitoring). Answer is No, but there are plans.

Plan for Archiving the data:

• PER_JOB_HISTORY_DIR to take all Job Classads and publish to ElasticSearch. (Not foreseeable)
• Do condor_history remotely and publish to ES. (Work in progress by Brian B.)

Justas Balcas (CALTECH)

2016-03-01

What Next?

Submission infrastructure group leaders:
Antonio Perez-Calero Yzquierdo (PIC), David Alexander Mason (FNAL) and James Letts (UCSD)

GlideinWMS operations and development team at FNAL:
Anthony Tiradani, Burt Holzman, Krista Larson, Marco Mambelli and Parag Mhashilkar
HTCondor developers:
Todd Tannenbaum, Jaime Frey, Tim Theisen and others working behind the scene
OSG factory operations team:
Brendan Denis, Jeffrey Dost, Martin Kandes and Vassil Verguilov
CRAB3 and WMAgent Operations team:
Alan Malta, Diego Ciangottini, Emilis Rupeika, Jadir Silva, Marco Mascheroni and

Stefano Belforte

And many many others!

Thanks to Everyone (and Brian)