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

The Netflix TechBlog

OCTOBER 19, 2020

If we had an ID for each streaming session then distributed tracing could easily reconstruct session failure by providing service topology, retry and error tags, and latency measurements for all service calls. Using simple lookup indices in Cassandra gives us the ability to maintain acceptable read latencies while doing heavy writes.

Infrastructure 233

Infrastructure Transportation Storage Open Source 233

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

O'Reilly

DECEMBER 2, 2019

For applications like communication between AVs, latency–how long it takes to get a response–is more likely to be a bigger limitation than raw bandwidth, and is subject to limits imposed by physics. There are impressive estimates for latency for 5G, but reality has a tendency to be harsh on such predictions. Upcoming events.

Wireless 53

Wireless Serverless IoT Artificial Intelligence 53

O'Reilly

NOVEMBER 12, 2019

We suspect this points to a general drift toward software teams taking more responsibility for infrastructure, and increasingly, enabled by serverless options. As noted earlier, the majority of survey respondents are software engineers. latency, startup, mocking, etc.) Industries of survey respondents.

Serverless 88

Serverless Architecture FinTech Infrastructure 88

Tasktop

JUNE 18, 2019

In one week’s time, thousands of IT and business professionals will descend on London for the latest iteration of DevOps Enterprise Summit London 2019 (June 25-27 – InterContinental O2, London, UK). Here are four tips to get the most out of DOES London 2019: Tip #1 – Develop a plan of attack. The countdown is on.

DevOps 74

DevOps Network Software Software 74

The Netflix TechBlog

MARCH 1, 2021

It supports both high throughput services that consume hundreds of thousands of CPUs at a time, and latency-sensitive workloads where humans are waiting for the results of a computation. The subsystems all communicate with each other asynchronously via Timestone, a high-scale, low-latency priority queuing system. Warm capacity.

Serverless 228

Serverless Media Latency Social Media 228

The Netflix TechBlog

MAY 14, 2021

We are expected to process 1,000 watermarks for a single distribution in a minute, with non-linear latency growth as the number of watermarks increases. The goal is to process these documents as fast as possible and reliably deliver them to recipients while offering strong observability to both our users and internal teams.

Traffic 160

Traffic Latency Java Google 160

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Software-based clocksources could fix those issues and provide accurate monotonically-increasing time.

Speed 126

Speed Java AWS Virtualization 126

Dynatrace

JUNE 25, 2021

Already in the 2000s, service-oriented architectures (SOA) became popular, and operations teams discovered the need to understand how transactions traverse through all tiers and how these tiers contributed to the execution time and latency. In 2019, the OpenCensus and OpenTracing projects merged into what we now know as OpenTelemetry.

Open Source 202

Open Source Monitoring Google Systems 202

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. 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 2019 myself and others tested kvm-clock and found it was only about 20% slower than tsc.

Speed 52

Speed Java AWS Virtualization 52

Dynatrace

JANUARY 15, 2020

Having released this functionality in an Preview Release back in September 2019, we’re now happy to announce the General Availability of our Citrix monitoring extension. Dynatrace is naturally suited to address these requirements with its automatic and AI-powered full-stack software intelligence platform. Dynatrace news. Citrix VDA.

Latency 36

Latency Performance Virtualization Infrastructure 36

The Morning Paper

JULY 4, 2019

Two failure modes we focus on are a service becoming slower (increase in response latency) or a service failing outright (returning errors). The criticality score is combined with a safety score and experiment weight (failure experiments, then latency, than failure inducing latency) to produce the final prioritization score.

Latency 77

Latency Engineering Metrics Traffic 77

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Software-based clocksources could fix those issues and provide accurate monotonically-increasing time.

Speed 40

Speed Java AWS Virtualization 40

The Morning Paper

DECEMBER 10, 2019

HotStorage 2019. To accomodate the differing needs of hardware and software, Twizzler introduces the notions of global and logical object spaces. At 0.4ns, we’re in the same ballpark as regular L1 cache reference latency. A tale of two abstractions: the case for object space , Bittman et al., Object spaces. The last word.

Hardware 52

Hardware Virtualization Operating System Programming 52

O'Reilly

JULY 20, 2021

In 2019, YouTube had to settle with the FTC for a $170 million fine for selling ads targeting children. You will find that the paradigms you choose for other parties won’t align with the expectations for children, and modifying your software to accommodate children is difficult or impossible. About 40% of all households have a child.

Google 121

Google Games Technology Technology 121

HammerDB

OCTOBER 18, 2019

rc3-custom #1 SMP Mon Aug 12 14:07:33 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux Welcome to Ubuntu 19.04 (GNU/Linux 5.3.0-rc3-custom HammerDB and the TPC-C derived workload can achieve signficantly higher levels of throughput running at 95%+ CPU utilization with some of the commercial database software offerings. rc3-custom x86_64).

Benchmarking 63

Benchmarking Performance Hardware C++ 63

The Morning Paper

JANUARY 26, 2020

This week we’ll be looking at a selection of papers from the 2019 edition of the ACM Symposium of Cloud Computing ( SoCC ). Reverb: speculative debugging for web applications , Netravali & Mickens, SOCC’19. candidate bug-fixes) during replay.

Programming 86

Programming Servers Network Latency 86

Enprowess

SEPTEMBER 7, 2021

According to the latest Stackoverflow developer survey , JavaScript is a well-liked technology used by software developers. Software Developers got to use JavaScript CLI tools to create the back-end part of web applications or server-side. with its low latency I/O operations, gives the benefit of ‘No buffering’ to developers.

Open Source 52

Open Source Virtualization Programming Servers 52

John McCalpin

JULY 23, 2018

(From a recent post of mine on the Intel software developer forums — some potentially useful words to go along with my new low-overhead-timers project…). Updates on 2019-01-23 in blue. There are lots of topics that you need to be aware of when attempting fine-grain timing.

Code 45

Code Programming Latency Testing 45

KeyCDN

JULY 11, 2019

Using an image CDN, such as KeyCDN, can significantly reduce the latency of your image delivery. Well, according to HTTP Archive , as of June 1, 2019 the average desktop page is 1,896.8 The main reason is because it decreases the latency to the user where they are located by serving your images from a POP physically closest to them.

Speed 52

Speed Website Mobile Latency 52

HammerDB

OCTOBER 12, 2018

CPUs which need to have their frequency coordinated by software: 0 . maximum transition latency: Cannot determine or is not supported. . /cpupower frequency-info analyzing CPU 0: . driver: intel_pstate CPUs which run at the same hardware frequency: 0 . hardware limits: 1000 MHz - 3.80 Install MySQL or MariaDB from Source.

Best Practices 40

Best Practices Scalability Performance C++ 40

Testsigma

FEBRUARY 12, 2021

The implementation of emerging technologies has helped improve the process of software development, testing, design and deployment. Are you aware that the scale of the app testing industry in 2019 was over USD$ 40 billion? Any organization recruits experienced testing agencies to comply with their specifications for software testing.

Artificial Intelligence 92

Artificial Intelligence Software Software IoT 92

Smashing Magazine

JANUARY 7, 2019

Front-End Performance Checklist 2019 [PDF, Apple Pages, MS Word]. Front-End Performance Checklist 2019 [PDF, Apple Pages, MS Word]. 2019-01-07T12:00:13+00:00. 2019-04-29T18:34:58+00:00. Estimated Input Latency tells us if we are hitting that threshold, and ideally, it should be below 50ms. Vitaly Friedman.

Performance 103

Performance Cache Metrics Network 103

Smashing Magazine

SEPTEMBER 29, 2021

Specific use cases may require image formats that support other features like: Software support: An image format may perform very well but is useless if browsers, CDN’s and other image manipulation tools do not recognize it. It was released in February 2019 by the Alliance for Open Media (AOMedia). Jump to table of contents ?.

Open Source 144

Open Source Speed Website Google 144

Smashing Magazine

JANUARY 6, 2020

Estimated Input Latency tells us if we are hitting that threshold, and ideally, it should be below 50ms. Designed for the modern web, it responds to actual congestion, rather than packet loss like TCP does, it is significantly faster , with higher throughput and lower latency — and the algorithm works differently.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 11, 2021

Estimated Input Latency tells us if we are hitting that threshold, and ideally, it should be below 50ms. Designed for the modern web, it responds to actual congestion, rather than packet loss like TCP does, it is significantly faster , with higher throughput and lower latency — and the algorithm works differently.

Performance 145

Performance Cache Media Metrics 145