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

Dynatrace

SEPTEMBER 25, 2019

Therefore, it requires multidimensional and multidisciplinary monitoring: Infrastructure health —automatically monitor the compute, storage, and network resources available to the Citrix system to ensure a stable platform. Citrix platform performance—optimize your Citrix landscape with insights into user load and screen latency per server.

Latency 118

Latency Performance Virtualization Infrastructure 118

CSS Wizardry

MAY 19, 2020

It’s widely accepted that self-hosted fonts are the fastest option: same origin means reduced network negotiation, predictable URLs mean we can preload , self-hosted means we can set our own cache-control. On a high-latency connection, this spells bad news. Put another-other way, this file is latency-bound, not bandwidth-bound.

Google 364

Google Media Latency Metrics 364

KeyCDN

FEBRUARY 4, 2021

Using a fast DNS hosting provider ensures there is less latency between the DNS lookup and TTFB. Just like with content delivery networks, DNS hosting providers also have multiple POPs. Their network is made up of over 60 POPs and supports IPv6 everywhere. DNS speed comparison report Who offers the best free DNS?

Cache 134

Cache Website Internet Internet 134

Adrian Cockcroft

JANUARY 20, 2023

In comparison, for Linpack Frontier operates at 68% of peak capacity. Most of the top supercomputers are similar to Frontier, they use AMD or Intel CPUs, with GPU accelerators, and Cray Slingshot or Infiniband networks in a Dragonfly+ configuration.

Architecture 52

Architecture Latency Benchmarking AWS 52

The Morning Paper

JANUARY 30, 2020

Edge servers are the middle ground – more compute power than a mobile device, but with latency of just a few ms. The client MWW combines these estimates with an estimate of the input/output transmission time (latency) to find the worker with the minimum overall execution latency. The opencv app has the largest state (4.6

Mobile 104

Mobile Cloud Latency Games 104

IO River

NOVEMBER 2, 2023

This is where a well-architected Content Delivery Network (CDN) shines. Â The goal is to boost the pitfalls of network disruptions and vendor dependencies, all while pocketing cost savings. This way, even if a user desires to watch in 4K but lacks the necessary network resources, HLS steps in to offer a lower-quality version.

Architecture 52

Architecture Performance Internet Internet 52

IO River

NOVEMBER 2, 2023

This is where a well-architected Content Delivery Network (CDN) shines. The goal is to boost the pitfalls of network disruptions and vendor dependencies, all while pocketing cost savings. This way, even if a user desires to watch in 4K but lacks the necessary network resources, HLS steps in to offer a lower-quality version.

Architecture 52

Architecture Performance Internet Internet 52

Smashing Magazine

AUGUST 10, 2023

The other issue is that the data I’m getting back is based on lab simulations where I can add throttling, determine the device that’s used, and the network connection, among other simulated conditions. On that note, it’s worth calling out that there are multiple flavors of network throttling. Real usage data would be better, of course.

Speed 81

Speed Monitoring Testing Network 81

The Morning Paper

NOVEMBER 15, 2020

An IDS/IPS monitors network flows and matches incoming packets (or more strictly, Protocol Data Units, PDUs) against a set of rules. This makes the whole system latency sensitive. The baseline for comparison is Snort 3.0 , “the most powerful IPS in the world” according to the Snort website. IDS/IPS requirements.

Servers 128

Servers Hardware Latency Design 128

Highly Scalable

SEPTEMBER 18, 2012

Historically, NoSQL paid a lot of attention to tradeoffs between consistency, fault-tolerance and performance to serve geographically distributed systems, low-latency or highly available applications. Isolated parts of the database can serve read/write requests in case of network partition. Read/Write latency. Data Placement.

Database 213

Database Latency C++ Scalability 213

HammerDB

OCTOBER 23, 2023

With a simple example such as this, it would not necessarily be expected for the additional network traffic to be significant between the 2 approaches. However, with more complex application logic this network round trip soon becomes a key focus area for improving performance. On MySQL, we saw a 1.5X performance advantage.

Benchmarking 62

Benchmarking Database Network C++ 62

Smashing Magazine

MAY 16, 2022

This header can be set on the response of any network resource, such as XHR, fetch, images, HTML, stylesheets, etc. These subtypes are currently the only subtypes related to network requests and thus exposing the Server-Timing information. Setting Server-Timing. For Images, Stylesheets, JS files, the HTML Doc, etc.

Servers 92

Servers Monitoring Cache Network 92

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

Dynatrace

JANUARY 15, 2020

Therefore, it requires multidimensional and multidisciplinary monitoring: Infrastructure health —automatically monitor the compute, storage, and network resources available to the Citrix system to ensure a stable platform. Citrix platform performance—optimize your Citrix landscape with insights into user load and screen latency per server.

Latency 36

Latency Performance Virtualization Infrastructure 36

The Netflix TechBlog

JANUARY 24, 2022

Technically, “performance” metrics are those relating to the responsiveness or latency of the app, including start up time. so are power levels and network bandwidth. This post describes how the Netflix TVUI team implemented a robust strategy to quickly and easily detect performance anomalies before they are released?—?and

Performance 199

Performance Metrics Performance Testing Testing 199

The Netflix TechBlog

DECEMBER 2, 2019

Suppose the encoding team develops more efficient encodes that improve video quality for members with the lowest quality (those streaming on low bandwidth networks). Your instinct might tell you this is caused by an unusually slow network, but you still become frustrated that the video quality is not perfect.

Metrics 143

Metrics Strategy Efficiency Testing 143

The Netflix TechBlog

DECEMBER 2, 2019

Suppose the encoding team develops more efficient encodes that improve video quality for members with the lowest quality (those streaming on low bandwidth networks). Your instinct might tell you this is caused by an unusually slow network, but you still become frustrated that the video quality is not perfect.

Metrics 140

Metrics Strategy Efficiency Testing 140

The Netflix TechBlog

DECEMBER 2, 2019

Suppose the encoding team develops more efficient encodes that improve video quality for members with the lowest quality (those streaming on low bandwidth networks). Your instinct might tell you this is caused by an unusually slow network, but you still become frustrated that the video quality is not perfect.

Metrics 130

Metrics Strategy Efficiency Testing 130

Brendan Gregg

AUGUST 8, 2017

90491 N|rnberg (Germany) Consulting+Networking+Programming+etc'ing 42. Network I/O? Perhaps one day we'll add additional load averages to Linux, and let the user choose what they want to use: a separate "CPU load averages", "disk load averages", "network load averages", etc. Latency was acceptable and no one complained.

Latency 111

Latency Metrics C++ Systems 111

The Morning Paper

MAY 28, 2019

The resulting system can integrate seamlessly into a scikit-learn based development process, and dramatically reduces the total energy usage required for classification with very low latency. So decision trees are essentially networks of threshold functions. Introducing race logic. Race logic encodes values by delaying signals.

Energy 52

Energy Hardware Efficiency Architecture 52

Brendan Gregg

OCTOBER 8, 2018

eBPF was created by Alexei Starovoitov while at PLUMgrid (he's now at Facebook) as a generic in-kernel virtual machine, with software defined networks as the primary use case. See the [reference guide] for more details. ## Script Comparison I could pick scripts that minimize or maximize the differences, but either would be misleading.

C++ 110

C++ Virtualization Programming Latency 110

Smashing Magazine

JANUARY 11, 2021

Networking, HTTP/2, HTTP/3 OCSP stapling, EV/DV certificates, packaging, IPv6, QUIC, HTTP/3. Alternatively, you can also use: Addy Osmani’s Chrome UX Report Compare Tool , Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing). 300ms RTT, 1.6

Performance 145

Performance Cache Media Metrics 145

The Morning Paper

AUGUST 29, 2019

For those systems where you provide your own compute instances, the default configuration tested used a 4-node r4.8xlarge cluster with 10Gb/s networking. The experimental results focus on six main areas of comparison: query restrictions system initialisation time query performance cost data compatibility with other systems scalability.

Architecture 76

Architecture Cloud Storage Serverless 76

Testsigma

JANUARY 30, 2021

Each smartphone comes with various screen sizes and resolutions, operates on different network speeds, and has different hardware capabilities. Test how user-friendly an application is: Google search engine gives high priority to websites in comparison to desktop apps. Google ranks applications based on how user friendly it is.

Mobile 52

Mobile Testing Website Internet 52

The Morning Paper

DECEMBER 8, 2019

Therefore any programming abstraction must be low latency and the kernel needs to be kept off the path of persistent data access as much as possible. Traditionally one of the major costs when moving data in and out of memory (be it to persistent media or over the network) is serialisation.

Hardware 56

Hardware Programming Media Storage 56

ScaleOut Software

MAY 15, 2014

Likewise, object access paths must be heavily multi-threaded and avoid lock contention to minimize access latency and maximize throughput. Also, load-balancing after membership changes must be both multi-threaded and pipelined to drive the network at maximum bandwidth. Testing Scale-Up Performance. Please retry later.

Cache 40

Cache Servers Network Design 40

KeyCDN

SEPTEMBER 12, 2019

An easy way to compress images is with our image processing service that happens to also be fully integrated into our existing network. Image CDN Using a content delivery network like KeyCDN, or what we also call an image CDN , can be one of the easiest and fastest ways to speed up the delivery of your images.

Social Media 106

Social Media Media Google Website 106

Smashing Magazine

JANUARY 6, 2020

Alternatively, you can also use Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing). Paddy Ganti’s script constructs two URLs (one normal and one blocking the ads), prompts the generation of a video comparison via WebPageTest and reports a delta.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 7, 2019

To get a good first impression of how your competitors perform, you can use Chrome UX Report ( CrUX , a ready-made RUM data set, video introduction by Ilya Grigorik), Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing). 150ms RTT, 1.5 Mbps down, 0.7

Performance 103

Performance Cache Metrics Network 103

Brendan Gregg

OCTOBER 7, 2018

eBPF was created by Alexei Starovoitov while at PLUMgrid (he's now at Facebook) as a generic in-kernel virtual machine, with software defined networks as the primary use case. See the [reference guide] for more details. ## Script Comparison I could pick scripts that minimize or maximize the differences, but either would be misleading.

C++ 40

C++ Virtualization Programming Latency 40

Percona

MAY 2, 2023

Especially if going into or out of storage types that may throttle bandwidth/network traffic. Storage destination: Backups stored on the same disk as the database can impact read and write operations, while backups stored on a remote server can increase network traffic and cause latency.

Best Practices 52

Best Practices Database Storage Servers 52

Alex Russell

APRIL 29, 2021

Real-time network protocols for enabling videoconferencing, desktop sharing, and game streaming applications. Modern, asynchronous network APIs that dramatically improve performance in some situations. For heavily latency-sensitive use-cases like WebXR, this is a critical component in delivering a good experience. Gamepad API.

Media 145

Media Games Education Engineering 145

Alex Russell

JULY 14, 2021

Because they lean on the system-provided WebView component, they do not need to pay the expense of a heavier app download to support rendering HTML, running JavaScript, decoding images, or loading network resources. Facebook engineers have noted that the FB IAB is important in fighting bad behaviour on their social network.

Google 121

Google Mobile Engineering Internet 121

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. At my employer we sometimes use SR-IOV for direct network interface access, and NVMe for direct disk access. Hit Ctrl-C to end. ^C

Virtualization 76

Virtualization AWS Engineering Hardware 76

Highly Scalable

MAY 1, 2012

This approach often leads to heavyweight high-latency analytical processes and poor applicability to realtime use cases. This process is shown in the figure below: It is clear that if sketch is large in comparison with the cardinality of the data set, almost each value will get an independent counter and estimation will precise.

Analytics 191

Analytics Traffic Big Data Efficiency 191

Smashing Magazine

AUGUST 22, 2021

As we will see, QUIC and HTTP/3 indeed have great web performance potential, but mainly for users on slow networks. If your average visitor is on a fast cabled or cellular network, they probably won’t benefit from the new protocols all that much. Two-way latency is often called round-trip time (RTT). Congestion Control.

Performance 105

Performance Network Latency Servers 105