Brendan Gregg

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Brendan Gregg speaking at ZFS Day, Oct 2, 2012, San Francisco.

Brendan Gregg is a kernel and performance engineer at Netflix, known for his work in systems performance analysis. He previously worked at Sun Microsystems, Oracle Corporation, and Joyent.

Gregg was born in Newcastle, New South Wales and attended University of Newcastle, Australia. After working as a technical instructor for Sun Microsystems and later as a consultant, he was hired to join Sun's Fishworks team in San Francisco. In October, 2010, he left Oracle for a position as a Lead Performance Engineer at Joyent. In March, 2014, he became a Senior Performance Architect at Netflix.

Gregg is one of the leading experts on DTrace, creator of the DTraceToolkit,[1] and author of books on DTrace and systems performance. He is also the star of the Shouting in the Data Center viral video.[2]

In November, 2013, he was awarded the LISA Outstanding Achievement Award "For contributions to the field of system administration, particularly groundbreaking work in systems performance analysis methodologies."[3]

He now investigates and writes about Linux performance on his new blog.[4]


Gregg has developed various methodologies for performance analysis, notably the USE Method methodology (short for Utilization Saturation and Errors Method).[5]

He has also created visualization types to aid performance analysis, including latency heat maps,[6] utilization heat maps, subsecond offset heat maps, and flame graphs.[7]


  • Brendan Gregg (December 2019). BPF Performance Tools. ISBN 978-0136554820.
  • Brendan Gregg (April 2014). "The Case of the Clumsy Kernel". ;login:. USENIX. 39 (2): 21–25. ISSN 1044-6397. Retrieved 2014-09-16. CS1 maint: discouraged parameter (link)
  • Brendan Gregg (October 2013). Systems Performance: Enterprise and the Cloud. ISBN 0133390098.



  1. ^ Brendan Gregg. "DTraceToolkit".
  2. ^ Bryan Cantrill; Brendan Gregg (2008-12-31). "Shouting in the Datacenter".
  3. ^ USENIX Association (2013-11-10). "LISA Outstanding Achievement Award".
  4. ^ Brendan Gregg. "".
  5. ^ Gregg, Brendan. "The USE Method". Retrieved 2018-07-06.
  6. ^ Joab Jackson (2010-06-28). "Oracle engineer reveals latency mysteries with heat maps". Archived from the original on 2013-11-09. Retrieved 2013-11-09.
  7. ^ Joab Jackson (2013-11-08). "Flame graph shows computer system performance in a new light".

External links[edit]


US patent 8547379, David Pacheco, Brendan Gregg, Bryan Cantrill, "Systems, methods, and media for generating multidimensional heat maps", issued 2013-10-01, assigned to Joyent Inc. 

US patent 8468251, William D. Pijewski, Gerald A. Jelinek, Brendan Gregg, Bryan Cantrill, "Dynamic throttling of access to computing resources in multi-tenant systems", issued 2013-06-18, assigned to Joyent Inc. 

US patent 8032708, Brendan D. Gregg, Adam H. Leventhal, Bryan M. Cantrill, "Method and system for caching data in a storage system", issued 2011-10-04, assigned to Oracle America, Inc. 

US patent 7979638, Adam H. Leventhal, Brendan D. Gregg, Bryan M. Cantrill, "Method and system for accessing data using an asymmetric cache device", issued 2011-07-12, assigned to Oracle America, Inc.