Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory. Ford, et al., “TCP

Performance 110

Performance Latency Cache Virtualization 110

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. What about short-lived processes, like a service restarting in a loop? As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. in total.

Speed 126

Speed Java AWS Virtualization 126

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. Many critiques are possible, both of the target (five seconds for first load), the sample population (worldwide internet users), and of the methodology (informed reckons).

Performance 90

Performance Network Mobile Speed 90

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory. Ford, et al., “TCP

Performance 52

Performance Latency Cache Virtualization 52

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. What about short-lived processes, like a service restarting in a loop? As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. in total.

Speed 52

Speed Java AWS Virtualization 52

O'Reilly

JANUARY 16, 2024

software” rather than “hardware” in our brains). Whenever I paused for too long, ChatGPT would interpret what I said so far as my request and start processing it. My folk theory is that speaking and listening are hard-wired into our brain’s innate language circuitry, but writing and reading are learned skills (i.e.,

Entertainment 73

Entertainment Internet Internet Design 73

Testsigma

JANUARY 30, 2021

With the rapidly increasing use of smartphones and ease of access to the internet across the globe, testing has spread across vast platforms. For example, if you are using internet banking via a Mobile Web application, it will not allow you to save cards or mark any transaction as favourite. What are Mobile Web Applications?

Mobile 52

Mobile Testing Website Internet 52

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. What about short-lived processes, like a service restarting in a loop? As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. in total.

Speed 40

Speed Java AWS Virtualization 40

Smashing Magazine

AUGUST 3, 2021

This liberal attitude is known as Postel’s Law, which is conveyed superbly by Jeremy Keith in Resilient Web Design : “Even if there are errors in the HTML or CSS, the browser will still attempt to process the information, skipping over any pieces that it can’t parse.”. JavaScript is less forgiving. Resilience is extrinsic. More after jump!

Network 145

Network Engineering Availability Monitoring 145

KeyCDN

JULY 11, 2019

Using an image CDN, such as KeyCDN, can significantly reduce the latency of your image delivery. This is crucial due to mobile devices requiring additional optimizations because they typically have less powerful hardware and a slower network connection when compared to desktop devices. Mbps ( Opensignal ).

Speed 52

Speed Website Mobile Latency 52

Highly Scalable

SEPTEMBER 18, 2012

Although it can hardly be said that NoSQL movement brought fundamentally new techniques into distributed data processing, it triggered an avalanche of practical studies and real-life trials of different combinations of protocols and algorithms. Read/Write latency. Read/Write requests are processes with a minimal latency.

Database 213

Database Latency C++ Scalability 213

All Things Distributed

JULY 13, 2010

Customers with complex computational workloads such as tightly coupled, parallel processes, or with applications that are very sensitive to network performance, can now achieve the same high compute and networking performance provided by custom-built infrastructure while benefiting from the elasticity, flexibility and cost advantages of Amazon EC2.

Cloud 118

Cloud AWS Automotive Latency 118

Alex Russell

APRIL 29, 2021

In almost every area, Apple's low-quality implementation of features WebKit already supports requires workarounds not necessary for Firefox (Gecko) or Chrome/Edge/Brave/Samsung Internet (Blink). For heavily latency-sensitive use-cases like WebXR, this is a critical component in delivering a good experience. Converging Views.

Media 145

Media Games Education Engineering 145

Alex Russell

JULY 14, 2021

Modern browsers like Chrome and Samsung Internet support a long list of features that make web apps more powerful and keep users safer. Hardware access APIs, notably: Geolocation. Samsung Internet set as the default browser and loads web pages from links in the app. PWA Feature Detector. Web OTP (for easier/faster sign-in).

Google 121

Google Mobile Engineering Internet 121

Smashing Magazine

MAY 20, 2020

This metric is important, but quite vague because it can include anything — starting from server rendering time and ending up with latency problems. For example, for an internet shop, it may be a page with a product list, product details page, shopping cart, checkout, and so on. Use Of Multiple Processes. Array(cors)].map(()

Performance 98

Performance Metrics Best Practices Code 98

Brendan Gregg

SEPTEMBER 5, 2017

There's also a ZFS send/recv code path that should try to use the TASK_INTERRUPTIBLE flag (as suggested by a coworker), to avoid a kernel hang (can't kill -9 the process). 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.

Virtualization 76

Virtualization AWS Engineering Hardware 76

Smashing Magazine

JANUARY 7, 2019

So, if we created an overview of all the things we have to keep in mind when improving performance — from the very start of the process until the final release of the website — what would that list look like? Also, as Patrick Meenan suggested, it’s worth to plan out a loading sequence and trade-offs during the design process.

Performance 103

Performance Cache Metrics Network 103

Smashing Magazine

JANUARY 6, 2020

So, if we created an overview of all the things we have to keep in mind when improving performance — from the very start of the process until the final release of the website — what would that list look like? Also, as Patrick Meenan suggested, it’s worth to plan out a loading sequence and trade-offs during the design process.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 11, 2021

Micro-optimizations are great for keeping performance on track, but it’s critical to have clearly defined targets in mind — measurable goals that would influence any decisions made throughout the process. Also, as Patrick Meenan suggested, it’s worth to plan out a loading sequence and trade-offs during the design process.

Performance 145

Performance Cache Media Metrics 145

Smashing Magazine

AUGUST 22, 2021

This is because HTTP/3 and QUIC mainly help deal with the somewhat uncommon yet potentially high-impact problems that can arise on today’s Internet. Because we are dealing with network protocols here, we will mainly look at network aspects, of which two are most important: latency and bandwidth. Congestion Control.

Performance 105

Performance Network Latency Servers 105

High Scalability

SEPTEMBER 14, 2018

events processed to date 300k+ users globally 50% of the Fortune 100 use @pagerduty 10,500+ customers of every size 300+ integrations ?? SCM slots between DRAM and flash in terms of latency, cost, and density. They'll love you even more. RachFrieee : 3.6B Enterprise grade security #PDSummit18 @jenntejada. So many more quotes.

Internet 30

Internet Internet Scalability Education 30

All Things Distributed

NOVEMBER 15, 2010

From financial processing and traditional oil & gas exploration HPC applications to integrating complex 3D graphics into online and mobile applications, the applications of GPU processing appear to be limitless. For example, the most fundamental abstraction trade-off has always been latency versus throughput.

AWS 136

AWS Latency Programming Architecture 136