Brendan Gregg

FEBRUARY 28, 2023

References I've reproduced the references from my SREcon22 keynote below, so you can click on links: [Gregg 08] Brendan Gregg, “ZFS L2ARC,” [link] , Jul 2008 [Gregg 10] Brendan Gregg, “Visualizations for Performance Analysis (and More),” [link] , 2010 [Greenberg 11] Marc Greenberg, “DDR4: Double the speed, double the latency?

Performance 52

Performance Latency Cache Virtualization 52

Brendan Gregg

SEPTEMBER 5, 2017

Linux has been adding tracing technologies over the years: kprobes (kernel dynamic tracing), uprobes (user-level dynamic tracing), tracepoints (static tracing), and perf_events (profiling and hardware counters). They use third-party software like Docker or Kubernetes to simplify their administration. People rarely create them manually.

Virtualization 76

Virtualization AWS Engineering Hardware 76

Alex Russell

JANUARY 30, 2024

HTML, CSS, images, and fonts can all be parsed and run at near wire speeds on low-end hardware, but JavaScript is at least three times more expensive, byte-for-byte. India's speed test medians are moving quickly, but variance is orders-of-magnitude wide, with 5G penetration below 25% in the most populous areas.

Performance 90

Performance Network Mobile Speed 90

Percona

SEPTEMBER 1, 2023

This blog was originally published in October 2017 and was updated in September 2023. Vertical scaling is also often discussed, which involves increasing the resources of a single server, which can have limitations in hardware capabilities and become costly as demands grow. There is no hard number in Gigabytes to justify a cluster.

Best Practices 73

Best Practices Traffic Database Servers 73

SQL Performance

JULY 16, 2019

A close monitoring of the hardware enthusiast community, including many of the most respected hardware analysts and reviewers paints an even more dire picture about Intel in the server processor space. This made it easier for database professionals to make the case for a hardware upgrade, and made the typical upgrade more worthwhile.

Servers 46

Servers Hardware Architecture Retail 46

Sutter's Mill

FEBRUARY 13, 2017

” This contains updated and new material that reflects the latest C++ standards and compilers, with a focus to using modern C++11/14/17 effectively on modern hardware and memory architectures. On April 25-27, I’ll be in Stockholm (Kista) giving a three-day seminar on “High-Performance and Low-Latency C++.”

Latency 51

Latency C++ Hardware Performance 51

Tim Kadlec

JANUARY 9, 2019

I recently profiled a page on a Pixel 2 (released in 2017), and an Alcatel 1x (released in 2018). Mbps download speed Jake Archibald mentioned his relative getting or the 0.8 Mbps download speed my in-laws get at their house. Hardware gets better, sure. The two devices represent very different ends of the spectrum.

Performance 111

Performance Energy Internet Internet 111

The Morning Paper

JANUARY 19, 2020

STELLA: report from the SNAFU-catchers workshop on coping with complexity , Woods 2017, Coping with Complexity workshop. “Coping with complexity” is about as good a three-word summary of the systems and software challenges facing us over the next decade as I can imagine. A digression on complexity budgets.

C++ 50

C++ Systems Software Software 50

Smashing Magazine

JANUARY 7, 2019

You need a business stakeholder buy-in, and to get it, you need to establish a case study on how speed benefits metrics and Key Performance Indicators ( KPIs ) they care about. Note : If you use Page Speed Insights (no, it isn’t deprecated), you can get CrUX performance data for specific pages instead of just the aggregates.

Performance 103

Performance Cache Metrics Network 103

Brendan Gregg

AUGUST 8, 2017

Anyway, the following patch seems to make the load average much more consistent WRT the subjective speed of the system. I generated this using my offcputime tool from [bcc] (this tool needs eBPF features from Linux 4.8+), and my [flame graph] software: #./bcc/tools/offcputime.py awk '{ print $1, $2 / 1000 }' out.stacks |./FlameGraph/flamegraph.pl

Latency 111

Latency Metrics C++ Systems 111