Brendan Gregg

JULY 4, 2021

## References I've reproduced the talk references 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? Ford, et al., “TCP

Performance 52

Performance Latency Hardware Storage 52

Scalegrid

JANUARY 19, 2024

This particular write concern prioritizes data longevity over reading speed. Using this specific approach also carries potential drawbacks such as decreased performance due to unavailable or lagging secondaries within the replica set network issues or server failures leading to increased latency for any ongoing writing processes.

Database 130

Database Network Servers Monitoring 130

Alex Russell

MARCH 6, 2021

Back in 2016, I gave a talk outlining the causes and effects of the terrible performance of web apps built using popular tools on the fastest-growing device segment: low-end to mid-range Android phones. In 2016, Jio swept over the subcontinent like a monsoon dropping a torrent of 4G infrastructure and free data rather than rain.

Performance 124

Performance Network Cache Metrics 124

KeyCDN

JANUARY 31, 2019

Today we’re excited to announce that we’ve launched yet another POP location to help further supercharge our network’s content delivery speeds. The next closest active POP location to Bucharest was Istanbul which was still almost 900km away; this distance adds up in terms of latency. million people.

Internet 48

Internet Internet Ecommerce Speed 48

Percona

JANUARY 24, 2023

Some of the built-in features ( wal_compression ) have been there since 2016, and almost all backup tools do the WAL compression before taking it to the backup repository. Individual processes generate WAL records, and latency is very crucial for transactions.

Database 116

Database Benchmarking Open Source Latency 116

KeyCDN

OCTOBER 24, 2018

Today we’re excited to announce that we’ve launched yet another POP location to help further supercharge our network’s content delivery speeds. Although both countries are relatively close to one another, they are separated by a distance of approximately 500km, which adds up in terms of latency. penetration rate.

Internet 48

Internet Internet Speed Network 48

John McCalpin

APRIL 2, 2020

This was a keynote presentation at the “2nd International Workshop on Performance Modeling: Methods and Applications” (PMMA16), June 23, 2016, Frankfurt, Germany (in conjunction with ISC16 ). In the 2007 SPECfp_rate tests, a similar phenomenon was seen, and required the addition of a third component to the model: memory latency.

Benchmarking 59

Benchmarking Performance Latency Architecture 59

The Morning Paper

MAY 21, 2019

.” This paper describes a “far memory” system that has been in production deployment at Google since 2016. This boils down to a single digit µs latency toleration in the tail for far memory, and in addition to security and privacy concerns, rules out remote memory solutions. Evaluation.

Software 78

Software Software Google Hardware 78

Alex Russell

MAY 9, 2022

This is a complex topic, but to borrow from a recent post , web performance expands access to information and services by reducing latency and variance across interactions in a session, with a particular focus on the tail of the distribution (P75+). Consistent performance matters just as much as low average latency.

Performance 86

Performance Latency Metrics Engineering 86

SQL Performance

APRIL 8, 2019

This processor has a base clock speed of 2.0GHz, with an all-core boost speed of 2.55GHz, and a max boost clock speed of 3.0GHz. The slightly newer Intel Xeon E5-26xx v4 (Broadwell) series which was introduced in Q1 of 2016, increased that to 2400MHz. The L3 cache size is 64MB. lanes for I/O connectivity. Memory (GiB).

Azure 42

Azure Virtualization Storage Benchmarking 42

CSS - Tricks

APRIL 1, 2021

Speed is also something Google considers when ranking your website placement on mobile. With all of this in mind, I thought improving the speed of my own version of a slow site would be a fun exercise. I’m going to update my referenced URL to the new site to help decrease latency that adds drag to the initial page load.

Cache 92

Cache Social Media Media Website 92

Rigor

JULY 2, 2019

By adding the need for additional JavaScript resources to your page, you increase the latency caused by the need to first download the webpage and then parse and execute the JavaScript before the browser can execute the redirect. Originally published September 2016, updated July 2019. REQUEST A FREE TRIAL OF RIGOR.

Mobile 60

Mobile Traffic Google Latency 60

Brendan Gregg

SEPTEMBER 5, 2017

LTS (April 2016). I wrote about it in a previous post, [DTrace for Linux 2016]. Here's some output from my zfsdist tool, in bcc/BPF, which measures ZFS latency as a histogram on Linux: # zfsdist. Tracing ZFS operation latency. The hardest part on Linux is now done: kernel support. Hit Ctrl-C to end. ^C

Virtualization 76

Virtualization AWS Engineering Hardware 76

Alex Russell

OCTOBER 22, 2017

JavaScript is the single most expensive part of any page in ways that are a function of both network capacity and device speed. It simulates a link with a 400ms RTT and 400-600Kbps of throughput (plus latency variability and simulated packet loss). The true median device from 2016 sold at about ~$200 unlocked.

Performance 68

Performance Benchmarking Network Mobile 68

John McCalpin

NOVEMBER 5, 2016

In the latest (October 2016) revision of Intel’s Instruction Extensions Programming Reference , Intel has disclosed a fairly dramatic departure from these “traditional” approaches. With 2 FMA units that have 5-cycle latency, the code must implement at least 2*5=10 independent accumulators in order to avoid stalls.

Cache 40

Cache C++ Latency Hardware 40

Alex Russell

FEBRUARY 3, 2023

They understood that most websites lack tight latency budgeting, dedicated performance teams, hawkish management reviews, ship gates to prevent regressions, and end-to-end measurements of critical user journeys. Not the developers being showered with shiny tools and boffo praise for replacing "legacy" HTML and CSS that performed fine.

Social Media 119

Social Media Website Technology Technology 119

All Things Distributed

DECEMBER 12, 2018

They can run applications in Sweden, serve end users across the Nordics with lower latency, and leverage advanced technologies such as containers, serverless computing, and more. The second platform is a managed IoT cloud with customer-facing applications and data management, which went live in 2016.

AWS 124

AWS Cloud Games Serverless 124