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 140

Performance Latency Hardware Storage 140

Dynatrace

NOVEMBER 3, 2021

For example, when monitoring a database, you’ll want to know about any latency when writing data to a disk or average query response time. Because monitoring tends to focus on key indicators such as utilization rates and throughput, monitoring indicates overall system performance.

Monitoring 216

Monitoring Metrics DevOps Scalability 216

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

Adrian Cockcroft

JANUARY 29, 2023

The mean and percentile measurements hide this structure, but the rest of this post will show how the structure can be measured and analyzed so that you can figure out a useful model of your system, understand what is driving the long tail of latencies and come up with better SLAs and measures of capacity. For this demo on an old MacBook (2.7

Lambda 98

Lambda Latency Cache C++ 98

Dynatrace

APRIL 26, 2022

STM generates traffic that replicates the typical path or behavior of a user on a network to measure performance for example, response times, availability, packet loss, latency, jitter, and other variables). Learn more about Dynatrace today with this Power Demo: Dynatrace and Business Observability: Tying IT Metrics to Business Outcomes.

Monitoring 200

Monitoring Social Media IoT Metrics 200

CSS Wizardry

MAY 19, 2020

On a high-latency connection, this spells bad news. Google Fonts are good to us—they preconnect the fonts.gstatic.com origin preemptively via an HTTP header attached to the fonts.googleapis.com response: While not all that effective in these demos, I wish more third-party providers would do things like this. Let’s see what happens.

Google 364

Google Media Latency Metrics 364

Brendan Gregg

JULY 2, 2021

biolatency Disk I/O latency histogram heat map. runqlat CPU scheduler latency heat map. In a previous blog post, [An Unbelievable Demo], I talked about how something similar happened many years ago where old tracing tool versions were used without updates. execsnoop New processes (via exec(2)) table. at the time.

Latency 145

Latency Cache Energy Systems 145

CSS Wizardry

APRIL 22, 2020

This is because file-size is only one aspect of web performance, and whatever the file-size is, the resource is still sat on top of a lot of other factors and constants—latency, packet loss, etc. TCP, Packets, and Round Trips. The point I’m driving at here is that it’s not just about file-size, it’s about TCP, packets, and round trips.

Latency 269

Latency Servers Website Speed 269

Dynatrace

DECEMBER 22, 2021

Metrics are measures of critical system values, such as CPU utilization or average write latency to persistent storage. To learn more about how Dynatrace leverages OpenTelemetry to advance the state of the art in observability, join us today for the on-demand Power Demo, Leverage OpenTelemetry with Dynatrace for opensource tracing.

Artificial Intelligence 175

Artificial Intelligence Metrics Architecture DevOps 175

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

Sutter's Mill

SEPTEMBER 11, 2020

This time I’ll include lots of updates, including that I hope to demo a working compiler implementation of the proposal. I can’t wait! Wednesday 0730 MDT: Bjarne Stroustrup AMA (moderator). Notes: Denver time zone (MDT) is the default, which is where the physical CppCon usually happens.

C++ 65

C++ Games Latency Programming 65

Smashing Magazine

MARCH 25, 2021

Also, if you are not using a content delivery network (CDN) or multiple CDNs to map users to the closest edge regions for reduced latencies — a practice called suboptimal routing — you might slow down the start of the video. You can check a sample page for a demo. Deliver through multiple CDNs.

Media 117

Media Performance Mobile Latency 117

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

Dotcom-Montior

NOVEMBER 16, 2021

As defined by the Google SRE initiative, the four golden signals of monitoring include the following metrics: Latency. Latency is the amount of time, or delay, a service takes to respond to a request. Get started for free with the Dotcom-Monitor 30-day trial or schedule a demo with one of our performance engineers.

Monitoring 91

Monitoring Google DevOps Engineering 91

Dotcom-Montior

NOVEMBER 24, 2021

This also includes latency, or the time it takes for data or a request to get through a network. Of if you prefer a one-on-one walk-through of the platform and individual solutions, contact our team for a live demo. This also gets into the SRE principle of embracing risk and learning how to manage failures.

Systems 74

Systems Monitoring Hardware Network 74

Smashing Magazine

AUGUST 15, 2023

Modern Methods For Improving Drupal’s Largest Contentful Paint Core Web Vital Modern Methods For Improving Drupal’s Largest Contentful Paint Core Web Vital Mike Herchel 2023-08-15T10:00:00+00:00 2023-08-15T13:35:08+00:00 Let’s start with a fairly common example of a hero component on the homepage of Drupal’s demo installation of the Umami theme.

Media 73

Media Metrics Mobile Best Practices 73

Tasktop

JUNE 18, 2019

From product demos (Tasktop’s demo is Wednesday, June 26 at 1:00pm in the Arora Foyer) to workshops, I can assure you there is never a shortage of content. That’s because there’s bottlenecks, latencies and dependencies further upstream, as well as down. Tip #3 – Take advantage of onsite activities.

DevOps 74

DevOps Network Software Software 74

Brendan Gregg

JULY 2, 2021

biolatency Disk I/O latency histogram heat map 5. runqlat CPU scheduler latency heat map 10. In a previous blog post, [An Unbelievable Demo], I talked about how something similar happened many years ago where old tracing tool versions were used without updates. execsnoop New processes (via exec(2)) table 2.

Open Source 40

Open Source Latency Cache Energy 40

Adrian Cockcroft

NOVEMBER 18, 2019

OPN304 Learnings from migrating a service from JDK 8 to JDK 11 AWS Lambda improved latency by migrating to JDK 11 with Amazon Corretto. Leigh Capili (DevAdv) demos how to launch apps from Git using Kubernetes orchestration, Ignite virtualization, and GitOps management.

Open Source 40

Open Source AWS Lambda Serverless 40

Adrian Cockcroft

NOVEMBER 18, 2019

OPN304 Learnings from migrating a service from JDK 8 to JDK 11 AWS Lambda improved latency by migrating to JDK 11 with Amazon Corretto. Leigh Capili (DevAdv) demos how to launch apps from Git using Kubernetes orchestration, Ignite virtualization, and GitOps management.

Open Source 40

Open Source AWS Lambda Serverless 40

CSS - Tricks

AUGUST 16, 2019

I’d like to say that this one AMP Story was an outlier, but each of the nine demos listed on the AMP Stories website sound just as incomprehensible in VoiceOver. And I couldn’t agree more; every loading screen and wait time is in some degree a mark of failure.

Performance 50

Performance Website Speed Latency 50

High Scalability

JANUARY 24, 2019

Rob Pike (1984) : A collection of impressions after doing a week’s work (rather than demo reception) at PARC. TServerless : We sat with a solution architect, apparently they are aware of the latency issue and suggested to ditch api gw and build our own solution. I'll be more than happy to talk about it in person.

Internet 29

Internet Internet Scalability Games 29

Percona

MAY 2, 2023

example.net --port=27017 --username=user --authenticationDatabase=admin --db=demo --collection=events --out=/opt/backup/mongodump-2011-10-24 Note : If we don’t specify the DB name or Collection name explicitly in the above “mongodump” syntax then the backup will be taken for the entire database or collections, respectively.

Best Practices 52

Best Practices Database Storage Servers 52

Abhishek Tiwari

NOVEMBER 3, 2018

Using CDN for the whole website, you can offload most of the website traffic to your CDN which will handle not only large traffic spikes but also reduce the latency of content delivery. They often get blindsided by vendor’s pitch and end-up making decision based on some fancy demos (see my post from 2014 on Adobe AEM ).

Systems 63

Systems Cache Website Network 63

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

The Netflix TechBlog

FEBRUARY 20, 2019

Today we are excited to announce latency heatmaps and improved container support for our on-host monitoring solution?—?Vector?—?to Remotely view real-time process scheduler latency and tcp throughput with Vector and eBPF What is Vector? to the broader community. Vector is open source and in use by multiple companies.

Performance 211

Performance Latency Open Source Metrics 211

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

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. process.exit(0); } }); Check the gist and demo repository. This metric shows how much time it takes for the server to respond with something. Large preview ).

Performance 98

Performance Metrics Best Practices Code 98

Brendan Gregg

SEPTEMBER 5, 2017

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. Many new tools can now be written, and the main toolkit we're working on is [bcc]. Hit Ctrl-C to end. ^C

Virtualization 76

Virtualization AWS Engineering Hardware 76

All Things Distributed

OCTOBER 25, 2018

The new AWS Africa (Cape Town) Region will have three Availability Zones and provide lower latency to end users across Sub-Saharan Africa. In Cape Town, AWS works with organizations such as Demo Africa, LaunchLab, Mzansi Commons, and Silicon Cape as well as co-working hubs, such as Workshop17.

AWS 167

AWS Cloud Education Programming 167

Smashing Magazine

JANUARY 7, 2019

Estimated Input Latency tells us if we are hitting that threshold, and ideally, it should be below 50ms. Thus, it "hides" latency (both in the network and on the server) from clients. Result: zero RTT for repeat views.

Performance 103

Performance Cache Metrics Network 103