Difference between revisions of "OpenZFS Developer Summit"

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The ''OpenZFS Developer Summit'' was held November 18-19, 2013.  The goals of the event were:
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{{:OpenZFS Developer Summit 2013}}
* to foster cross-platform community discussions of OpenZFS work
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* to make progress on some of the projects proposed for this community.
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[https://www.youtube.com/playlist?list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q Video recordings of the presentations] are in the OpenZFS channel on YouTube.
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[https://www.surveymonkey.com/s/SL98Z8H Participant Survey]: Please complete by December 6 end of day.
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== Topics that were discussed ==
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{| class="wikitable"
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!Title!!Speaker!!Slides!!Video
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|-
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|Introduction||Matt Ahrens||[http://www.slideshare.net/MatthewAhrens/open-zfs-devsummit slides]||[https://www.youtube.com/watch?v=U3dMhpmQTrU&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Platform Panel||Brian Behlendorf, Jorgen Lundman, Chris Siden, Xin Li||-||[https://www.youtube.com/watch?v=U3dMhpmQTrU&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Platform-independent code repository||Matt Ahrens||[http://www.slideshare.net/MatthewAhrens/openzfs-code-repository slides]||[https://www.youtube.com/watch?v=U3dMhpmQTrU&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Storage Tiering||Boris Protopopov||[http://www.open-zfs.org/w/images/7/71/ZFS_tiering.pdf slides]||[https://www.youtube.com/watch?v=tm0NYEVS6qM&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Vendor Lightning Talks||Many||-||[https://www.youtube.com/watch?v=EGKek5sZ2Xw&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|Community Planning||Karyn Ritter||[https://docs.google.com/presentation/d/1LCvQxcNSxUi-5-NUgVRKp68iMLOrepp1VRJxPrklBPY/pub?start=false&loop=false&delayms=3000 slides]||[https://www.youtube.com/watch?v=EGKek5sZ2Xw&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Channel Programs||Chris Siden, Max Grossman||[http://www.slideshare.net/MatthewAhrens/openzfs-channel-programs slides]||[https://www.youtube.com/watch?v=EGKek5sZ2Xw&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|Test Coverage||John Kennedy||[http://www.slideshare.net/jwk404/open-zfs-111813-28528303 slides]||[https://www.youtube.com/watch?v=M5RnPZW0_Xk&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|Performance Investigation||Adam Leventhal||[http://www.slideshare.net/ahl0003/openzfs-datadriven-performance slides]||[https://www.youtube.com/watch?v=w3-eppY7ICc&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Performance on full & fragmented pools||George Wilson||-||[https://www.youtube.com/watch?v=UuscV_fSncY&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|Scalability|| Kirill Davydychev ||-||[https://www.youtube.com/watch?v=hvoL6z8YKgM&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|Virtual Memory Interactions|| Brian Behlendorf ||-||[https://www.youtube.com/watch?v=hvoL6z8YKgM&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Multi Tenancy|| Rob Mustacchi ||-||[https://www.youtube.com/watch?v=MLTX1i7UEL4&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|-
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|Examining On-disk Format|| Max Bruning ||-||[https://www.youtube.com/watch?v=MLTX1i7UEL4&list=PLaUVvul17xSdWMBt5tAC8Hu7bbeWskD_q video]
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|}
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== Hackathon projects ==
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These projects were worked on at the hackathon:
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* Testrunner suite running on other platforms: linux, freebsd (+ illumos libzpool)
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* channel programs: pass instruction stream into kernel
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* ZFS send progress reporting with "set proc title"
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* dedicated kmem_cache for dedup table entries
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* larger (1MB) blocksize
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* compressed ARC
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* upstreaming dbuf_user & dbuf state machine (spectra DMU changes)
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* limit DDT size
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* onexit for osx
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== Event Planning Info ==
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See [[OpenZFS Developer Summit 2013 planning]]
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Revision as of 18:20, 22 November 2013

The first OpenZFS Developer Summit was held November 18-19, 2013. The goals of the event were:

  • to foster cross-platform community discussions of OpenZFS work
  • to make progress on some of the projects proposed for this community.

Video recordings of the presentations are in the OpenZFS channel on YouTube.

Topics that were discussed

Title Speaker Slides Video
Introduction Matt Ahrens slides video
Platform Panel Brian Behlendorf, Jorgen Lundman, Chris Siden, Xin Li - video
Platform-independent code repository Matt Ahrens slides video
Storage Tiering Boris Protopopov slides video
Vendor Lightning Talks representatives from each participating company - video
Community Planning Karyn Ritter slides video
Channel Programs Chris Siden, Max Grossman slides video
Test Coverage John Kennedy slides video
Performance Investigation Adam Leventhal slides video
Performance on full & fragmented pools George Wilson slides video
Scalability Kirill Davydychev - video
Virtual Memory Interactions Brian Behlendorf - video
Multi Tenancy Rob Mustacchi - video
Examining On-disk Format Max Bruning - video

Hackathon projects

These projects were worked on at the hackathon:

  • Testrunner suite running on other platforms: linux, freebsd (+ illumos libzpool)
    • John Kennedy, Steven Burgess, Ned Bass, Tony Nguyen, Kirill Davydychev, Matt Ahrens
    • Got several tests running on Linux
      • "it's a giant hack" -- lots of work needed to get this to integration quality
    • Got several tests running against libzpool on illumos (using userland ioctl shim)
  • channel programs: pass instruction stream into kernel
    • Chris Siden, Max Grossman, Alex Reece
    • See project page, slides and video describing project
    • Got snapshotting via a Lua program working all the way through the stack
  • ZFS send progress reporting with "set proc title"
    • Xin Li
    • Finished and sent for code review on FreeBSD
    • "ps" and "top" can display zfs send progress: "sending pool/fs@snap X MB done (24%)"
    • small amount of work needed to hook into title-updating routines on Linux and illumos
  • dedicated kmem_cache for dedup table entries
    • John Layman, Matt Youds, Kirill
    • goals: increase diagnosability, reduce memory consumption
    • Finished this and also added kmem_cache for l2arc header
  • larger (1MB) blocksize
    • Brian Behlendorf
    • Got it working, can set recordsize property to 1MB!
    • Next steps: performance investigation, thorough review of all uses of SPA_MAXBLOCKSIZE
  • compressed ARC
    • George Wilson, Rob Mustacchi
    • got it working! (modulo some refcount bugs)
    • Next steps: figure out better policy for when to compress/uncompress
  • upstreaming dbuf_user & dbuf state machine (spectra DMU changes)
    • Justin Gibbs, Tony Nguyen, Boris Protopopov
    • Lots of progress, got it compiling against latest illumos code and passes several tests
  • limit DDT size
    • Sanjeev Bagewadi, Prashanth Sreenivasa
    • got it sort of working w/ limit set by global tunable
  • onexit for osx
    • Jorgen Lundman
    • pretty annoying to implement since OSX doesn't give much visibility into file handles, vnodes, or device handles

Event Planning Info

See OpenZFS Developer Summit 2013 planning

A huge THANK YOU to the sponsors of the 2013 Developer Summit:

Delphix logo.png Ddrdrive logo dev 2013.png Logo freebsdfoundation.png
SageCloud-logo-RGB-large-optimized.jpg Ixsystems.jpg CS logo withTagline 150px.png
SpectraLogicLogo.jpg Joyent-logo.png New hac logo.jpg
Nexenta logo.jpg