Brendan Gregg @brendangregg Twitter profile

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Brendan Gregg

@brendangregg

4 years

Announcing my next book: Systems Performance: Enterprise and the Cloud, 2nd Edition (2020)

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Brendan Gregg

@brendangregg

5 years

Announcing my next book: BPF Performance Tools: Linux System and Application Observability, for which I developed over 100 new tools

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Brendan Gregg

@brendangregg

8 years

updated Linux tools diagram (PNG & SVG) with recent bcc additions

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Brendan Gregg

@brendangregg

5 years

Slides for Linux Systems Performance at USENIX #LISA19 and the updated observability diagram

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Brendan Gregg

@brendangregg

7 years

I emailed a Linux kernel dev about a 3 line change they made almost 24 years ago (Oct 1993), and got a detailed reply in 1 hr.

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Brendan Gregg

@brendangregg

10 years

Linux observability tools (from http://t.co/tMyCAxBwyS), updated for my #LinuxCon talk Wed http://t.co/26nvyxuH30

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Brendan Gregg

@brendangregg

2 years

new blog post: Netflix: End of Series 1

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Brendan Gregg

@brendangregg

4 years

My BPF book is publishing today as an eBook (it's already on Amazon), and InformIT have a 55% off for 2 or more Black Friday sale until Dec 3rd! Get copies for your whole team (thank you). Code "BF2019". #BPF

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Brendan Gregg

@brendangregg

5 years

new post, and perhaps a new year's resolution: Learn eBPF Tracing -- beginner, intermediate, and advanced

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Brendan Gregg

@brendangregg

2 months

New blog post: The Return of the Frame Pointers (Fedora, Ubuntu)

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Brendan Gregg

@brendangregg

7 years

new post: CPU utilization is wrong

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Brendan Gregg

@brendangregg

6 years

Good news from Oracle: DTrace is GPL'd (thank you!). I'd guess by the end of 2018 we'll have a working /usr/sbin/dtrace on Linux for running D scripts (using libbcc+eBPF on the backend)

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Brendan Gregg

@brendangregg

6 years

new post: bpftrace (DTrace 2.0) for Linux 2018. Repo just made public!

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Brendan Gregg

@brendangregg

2 years

New post about my new job: Brendan @Intel .com #IAmIntel

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Brendan Gregg

@brendangregg

5 years

People are already reading my next book, BPF Performance Tools: Linux System and Application Observability. The rough cut is now on Safari #eBPF

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Brendan Gregg

@brendangregg

7 years

new post: Linux Load Averages: Solving the Mystery

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Brendan Gregg

@brendangregg

2 years

Thanks, Greg! I'm thrilled to be joining at this exciting time. I'm looking forward to improving the performance and observability of everything -- all xPUs, apps to metal -- working with great people at a company I have long respected and admired.

Greg Lavender

@GregL_Intel

2 years

Welcome @brendangregg to our software team @Intel . Having worked with him at Sun Microsystems, his contributions to improving systems performance needs little introduction. He will focus on strengthening our leadership in computing across Intel’s xPUs.

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Brendan Gregg

@brendangregg

3 years

Systems Performance 2nd Edition paperback is finally available on Amazon US

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Brendan Gregg

@brendangregg

2 years

New startups are developing eBPF as a "zero instrumentation" observability/APM solution. Trace plaintext HTTP/gRPC/etc. across your site calls without code changes (zero added instrumentation). Currently via uprobe hacking. 1/n

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Brendan Gregg

@brendangregg

7 years

new Linux bcc/eBPF tools have merged, and I updated the diagram

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Brendan Gregg

@brendangregg

3 years

Systems Performance 2nd Edition (just released)

InformIT

@InformIT

3 years

📢 eBook Deal: Systems Peformance: Enterprise & the Cloud from @brendangregg eBook files include drm-free PDF, EPUB, & MOBI. $29.99 through Sat May 15: #linux #unix #cloudcomputing #BPF

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Brendan Gregg

@brendangregg

4 years

Linux Systems Performance in 40 minutes, a summary for everyone: My #LISA19 talk video is up

LISA19 - Linux Systems Performance

Linux Systems PerformanceBrendan Gregg, NetflixSystems performance is an effective discipline for performance analysis and tuning, and can help you find perf...

www.youtube.com

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Brendan Gregg

@brendangregg

3 years

Netflix tech blog: How Netflix uses eBPF flog logs at scale for network observability

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Brendan Gregg

@brendangregg

1 year

I'm hiring for my first ever team. My first job description is for Cloud Performance and eBPF engineers! (many locations, I don't know why it defaults to saying Arizona):

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Brendan Gregg

@brendangregg

3 years

new post: Moving my US tech job to Australia

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Brendan Gregg

@brendangregg

9 years

Slides for my Linux perf tools tutorial at #velocityconf 2015 http://t.co/DYCEMQlP5U http://t.co/ETAAmPO9RA

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Brendan Gregg

@brendangregg

2 months

New blog post: Linux crisis tools

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Brendan Gregg

@brendangregg

4 years

Cloudflare architecture and how BPF eats the world via @cloudflare

Cloudflare architecture and how BPF eats the world

Recently at I gave a short talk titled "Linux at Cloudflare". The talk ended up being mostly about BPF. It seems, no matter the question - BPF is the answer. Here is a transcript of a slightly...

blog.cloudflare.com

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Brendan Gregg

@brendangregg

3 years

new post: BPF Internals at USENIX #LISA21

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Brendan Gregg

@brendangregg

8 years

My reply to the recent reddit/redct redesign of the tools diagram

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Brendan Gregg

@brendangregg

5 years

Did Linux get slower after 4.14? Yes, if you use the KPTI defaults. How much? Between 1 and 800%, depending on your workload. I expected our workloads to slow by between 0.1 and 6%. I wrote about it before

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Brendan Gregg

@brendangregg

3 years

new blog post: An Unbelievable Demo

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Brendan Gregg

@brendangregg

6 years

Netflix FlameScope: a new open source performance analysis tool #flamescope

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Brendan Gregg

@brendangregg

6 years

Linus not only apologizes, but in detail. This is a huge moment for Linux, and tech.

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Brendan Gregg

@brendangregg

5 years

I get more requests to give BPF/bpftrace talks than I can do, so I'm opening up my slide source for others to use. #eBPF

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Brendan Gregg

@brendangregg

6 years

Netflix Titus, our container platform, is now open sourced

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Brendan Gregg

@brendangregg

4 years

my #reinvent talk BPF Performance Analysis at Netflix, including the BPF theremin demo, is now online:

AWS re:Invent 2019: [REPEAT 1] BPF performance analysis at Netflix...

Extended BPF (eBPF) is an open-source Linux technology that powers a whole new class of software: mini programs that run on events. Among its many uses, BPF ...

www.youtube.com

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Brendan Gregg

@brendangregg

8 years

new blog post: Linux BPF Superpowers

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Brendan Gregg

@brendangregg

7 years

I published a new page: Linux Enhanced BPF (eBPF) Tracing Tools

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Brendan Gregg

@brendangregg

4 years

Extended BPF has a new homepage: #bpf #ebpf

eBPF - Introduction, Tutorials & Community Resources

eBPF is a revolutionary technology that can run sandboxed programs in the Linux kernel without changing kernel source code or loading a kernel module.

ebpf.io

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Brendan Gregg

@brendangregg

6 years

new post: KPTI/KAISER Meltdown Initial Performance Regressions

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Brendan Gregg

@brendangregg

3 years

New post: ZFS is mysteriously eating my CPU

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Brendan Gregg

@brendangregg

6 years

My CPU utilization is WRONG lightning talk from #SCALE16x , with a surprise ending relevant to everyone in 2018 @opensourceway

CPU utilization is wrong

Everyone uses %CPU to measure performance, but everyone is wrong, says Netflix's Brendan Gregg in his UpSCALE Lightning Talk.

opensource.com

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Brendan Gregg

@brendangregg

8 years

Larry attacking another database for not being open source. When I'd thought I'd seen it all...

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Brendan Gregg

@brendangregg

7 years

new post: Solaris to Linux Migration, 2017

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Brendan Gregg

@brendangregg

2 months

New blog post: eBPF Documentary

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Brendan Gregg

@brendangregg

5 years

new blog post: Two kernel mysteries and the most technical talk I've ever seen #kr2019

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Brendan Gregg

@brendangregg

5 years

I've updated some Linux performance tool diagrams on

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Brendan Gregg

@brendangregg

5 years

"a regular expression that backtracked enormously and exhausted CPU" -- don't use regexps in perf critical code (as @guycirino would insist); thanks @Cloudflare for the writeup

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Brendan Gregg

@brendangregg

3 years

new post: How To Add eBPF Observability To Your Product, the quick and easy way #BPF #eBPF

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Brendan Gregg

@brendangregg

3 years

eBPF in Microsoft Windows is a big deal, not just for Microsoft, but for us in BPF. Technical decisions with BPF will consider other kernels when appropriate, so things work everywhere and not just on Linux... 1/2

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Brendan Gregg

@brendangregg

7 years

Just published: Give me 15 minutes and I'll change your view of Linux tracing #lisa16

Give me 15 minutes and I'll change your view of Linux tracing

Demo from the USENIX/LISA 2016 talk: Linux 4.X Tracing Tools: Using BPF Superpowers. Full talk slides and official video will be available at https://www.use...

www.youtube.com

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Brendan Gregg

@brendangregg

6 years

new post about Xen, Nitro, and bare metal: AWS EC2 Virtualization 2017 #reinvent

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Brendan Gregg

@brendangregg

7 years

new blog post: USENIX/LISA 2016 Linux bcc/BPF Tools

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Brendan Gregg

@brendangregg

3 years

new post: Poor disk performance

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Brendan Gregg

@brendangregg

2 years

Netflix/Intel working together to find low-level PMC-based perf wins in the cloud (by my colleagues Vadim and Harshad)

Seeing through hardware counters: a journey to threefold performance increase

By Vadim Filanovsky and Harshad Sane

netflixtechblog.com

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Brendan Gregg

@brendangregg

4 years

What BPF is really about (it's not just perf tools): I summarized it for the first time in this 30-min keynote, video now up

Ubuntu

@ubuntu

4 years

Extended BPF is a new software type and makes a fundamental change to the 50-year old kernel model. Hear what expert @brendangregg of #netflix says during his keynote at #UbuntuMasters via @YouTube

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Brendan Gregg

@brendangregg

3 years

new blog post: What is Observability?

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Brendan Gregg

@brendangregg

10 years

Now with a BSD kernel :-) FreeBSD perf observ tools for @MeetBSDCA http://t.co/e3PoBfUg1u

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Brendan Gregg

@brendangregg

3 years

eBPF Foundation announced. Founding members are Facebook, Google, Isovalent, Microsoft, Netflix.

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Brendan Gregg

@brendangregg

8 years

Linux Systems Performance in 50 mins, #PerconaLive video/slides

Linux Systems Performance 2016

Linux Systems Performance 2016 - Download as a PDF or view online for free

www.slideshare.net

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Brendan Gregg

@brendangregg

5 years

Next week is @usenix #LISA19 ; I'm updating my diagrams and slides for a Systems Performance talk

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Brendan Gregg

@brendangregg

6 years

new post: Evaluating the Evaluation: A Benchmarking Checklist

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Brendan Gregg

@brendangregg

6 years

Monitoring CPU/GPU temperature on my macbook

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Brendan Gregg

@brendangregg

8 years

Dynamic tracing tools for Linux: - the new homepage for bcc/BPF

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Brendan Gregg

@brendangregg

5 years

Welcome kubectl-trace by @fntlnz to @iovisor , the Linux Foundation eBPF project that hosts bcc and bpftrace. kubectl-trace runs bpftrace on Kubernetes.

GitHub - iovisor/kubectl-trace: Schedule bpftrace programs on your kubernetes cluster using the...

Schedule bpftrace programs on your kubernetes cluster using the kubectl - iovisor/kubectl-trace

github.com

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Brendan Gregg

@brendangregg

6 years

new post: TCP tracepoints have arrived in Linux! added in 4.15 and 4.16 #linux #netdev

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Brendan Gregg

@brendangregg

7 years

Serving 100 Gbps from an Open Connect Appliance by Drew Gallatin at Netfilx

Serving 100 Gbps from an Open Connect Appliance

By Drew Gallatin

netflixtechblog.com

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Brendan Gregg

@brendangregg

6 years

my most popular posts of 2017: %CPU: load avg: solaris2linux: jerks: netflix: nitro:

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Brendan Gregg

@brendangregg

3 years

New post: Computing Performance: On the Horizon. My @USENIX #LISA21 plenary session slides and video are online. Summarizes the present and my predictions for the future of performance.

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Brendan Gregg

@brendangregg

6 years

slides for my #reinvent talk: How Netflix tunes EC2 instances for performance

How Netflix Tunes EC2 Instances for Performance

How Netflix Tunes EC2 Instances for Performance - Download as a PDF or view online for free

www.slideshare.net

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Brendan Gregg

@brendangregg

6 years

Master list of AWS #reinvent 2017 sessions, with youtube, podcast, and slideshare links:

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Brendan Gregg

@brendangregg

4 years

The BPF Performance Tools book immediately sold out on Amazon (thanks for getting it!) I think there are still copies on InformIT while they print more

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Brendan Gregg

@brendangregg

8 years

new post: Linux tcptop (top for TCP) using bcc/BPF

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Brendan Gregg

@brendangregg

3 years

BPF Internals, @usenix #LISA21 video & slides are now online. From bpftrace to machine code, showing how it all works. #eBPF

LISA21 - BPF Internals

BPF InternalsBrendan GreggExtended BPF (aka eBPF) is a new type of software for secure, performant, event-driven programs, and has seen widespread adoption. ...

www.youtube.com

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Brendan Gregg

@brendangregg

7 years

My "Give me 15 minutes and I'll change your view of Linux tracing" post is popular today

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Brendan Gregg

@brendangregg

4 years

new post: Linux Systems Performance from USENIX LISA @LISAConference

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Brendan Gregg

@brendangregg

7 years

HUGE: "Going forward, we’ll use this hypervisor to power other instance types" - AWS's new KVM-based hypervisor

Now Available – Compute-Intensive C5 Instances for Amazon EC2 | Amazon Web Services

I’m thrilled to announce that the new compute-intensive C5 instances are available today in six sizes for launch in three AWS regions! These instances are designed for compute-heavy applications like...

aws.amazon.com

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Brendan Gregg

@brendangregg

4 years

BPF Performance Tools is shipping! While waiting for your copy you can read the first 100 pages on the preview here (or read the entire eBook) #eBPF

Alex B

@AlexB138

4 years

Just got @brendangregg new book! Excited to read this over the holiday break.

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Brendan Gregg

@brendangregg

4 years

I demoed my BPF theremin at #reInvent

AWS Open Source

@AWSOpen

4 years

...enabling us to instrument code to figure out arbitrary things like wifi signal strength.

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Brendan Gregg

@brendangregg

9 years

My best Linux Performance Tools tutorial, on video (100 minutes) with slides http://t.co/aXtuwDvtQE

Netflix at Velocity 2015: Linux Performance Tools

There are many performance tools nowadays for Linux, but how do they all fit together, and when do we use them?

netflixtechblog.com

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Brendan Gregg

@brendangregg

6 years

new post: How to measure the working set size on Linux

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Brendan Gregg

@brendangregg

6 years

It happened. Linux rules the #Top500 supercomputer Nov 2017 list, published today

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Brendan Gregg

@brendangregg

9 years

FreeBSD performance observability tools, in my latest post http://t.co/W3c8oyFkAW http://t.co/rLZxNdRRVj

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Brendan Gregg

@brendangregg

5 years

My new post on : An introduction to bpftrace for Linux #eBPF

An introduction to bpftrace for Linux

New Linux tracer analyzes production performance problems and troubleshoots software.

opensource.com

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Brendan Gregg

@brendangregg

3 years

eBPF comes to applications: BPF Memory Cache (BMC) is an eBPF memcached accelerator. Currently for GET requests over UDP. Promising work! Thanks @Orange

GitHub - Orange-OpenSource/bmc-cache: In-kernel cache based on eBPF.

In-kernel cache based on eBPF. Contribute to Orange-OpenSource/bmc-cache development by creating an account on GitHub.

github.com

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Brendan Gregg

@brendangregg

4 years

new blog post: BPF binaries: BTF, CO-RE, and the future of BPF perf tools #bpf #ebpf

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Brendan Gregg

@brendangregg

6 years

More TCP tracepoints land in Linux (net-next)! Thanks Song Liu (Facebook) #linux #netdev

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Brendan Gregg

@brendangregg

5 years

For my #SCaLE17x talk, I analyzed Minecraft live using eBPF, and built an off-CPU time flame graph of Minecraft delays with full stacks

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Brendan Gregg

@brendangregg

8 years

new post: DTrace for Linux 2016 (bcc/BPF)

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Brendan Gregg

@brendangregg

7 years

slides for my #DockerCon talk on Container Performance Analysis (in 3 mins)

Container Performance Analysis

Container Performance Analysis - Download as a PDF or view online for free

www.slideshare.net

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Brendan Gregg

@brendangregg

10 years

OS X perf tools, slide from my upcoming talk @MacITConf http://t.co/gmFQc74cnd #MacIT2014 http://t.co/KdKFif9En1

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Brendan Gregg

@brendangregg

6 years

eBPF comes to Red Hat: #RHEL 7.6 beta comes with eBPF for tracing!

Red Hat Enterprise Linux 7.6 Beta now available

The hybrid cloud requires a consistent foundation and today, we are pleased to refine and innovate that foundation with the availability of Red Hat Enterprise Linux 7.6 beta. The latest update to Red...

www.redhat.com

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Brendan Gregg

@brendangregg

7 years

LinkedIn has enhanced flame graphs to do automatic issue detection for common issues (JVM):

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Brendan Gregg

@brendangregg

7 years

I changed the motd on some servers recently and it's the best

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Brendan Gregg

@brendangregg

6 years

video for my #reinvent talk: How Netflix Tunes EC2 Instances for Performance

AWS re:Invent 2017: How Netflix Tunes Amazon EC2 Instances for...

At Netflix, we make the best use of Amazon EC2 instance types and features to create a high- performance cloud, achieving near bare-metal speed for our workl...

www.youtube.com

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Brendan Gregg

@brendangregg

3 years

Don't assume any eBPF observability post/talk/book has had any review by the eBPF community, or is based on any up to date research. I saw another case of 5-year old advice posted as new. Most advice (2021) summarized in this one slide