The Netflix TechBlog

SEPTEMBER 8, 2020

This allows the app to query a list of “paths” in each HTTP request, and get specially formatted JSON (jsonGraph) that we use to cache the data and hydrate the UI. For the migration, testing was a first-class citizen. Replay Testing Enter replay testing.

Latency 233

Latency Cache Java Traffic 233

The Netflix TechBlog

JUNE 4, 2019

Because microprocessors are so fast, computer architecture design has evolved towards adding various levels of caching between compute units and the main memory, in order to hide the latency of bringing the bits to the brains. This avoids thrashing caches too much for B and evens out the pressure on the L3 caches of the machine.

Cache 251

Cache Latency Airlines Logistics 251

John McCalpin

DECEMBER 6, 2016

The Xeon Phi x200 (Knights Landing) has a lot of modes of operation (selected at boot time), and the latency and bandwidth characteristics are slightly different for each mode. In “Cache” mode, MCDRAM memory is used as an L3 cache for the main DDR4 memory. numactl).

Latency 40

Latency Cache Testing Systems 40

Dynatrace

SEPTEMBER 13, 2023

The Site Reliability Guardian helps automate release validation based on SLOs and important signals that define the expected behavior of your applications in terms of availability, performance errors, throughput, latency, etc. If so, test against the response time objective under the same Site Reliability Guardian.

AWS 247

AWS Efficiency Azure Cloud 247

IO River

NOVEMBER 2, 2023

They cache static content and enable lightning-fast delivery around the globe.This symbiosis reduces server load, boosts loading times, and ensures efficient content distribution. Content Delivery Networks (CDNs), web browsers, and proxy servers can store static files in their caches.

Cache 52

Cache Social Media Website Performance Website 52

KeyCDN

NOVEMBER 4, 2021

The POP is strategially located within the country and lowers latency overall. KeyCDN is always on the lookout for ways to minimize latency and accelerate asset delivery worldwide. Hola Mexico! We've launched our new point of presence (POP) in Mexico City.

Latency 111

Latency Tuning Cache Traffic 111

Smashing Magazine

NOVEMBER 8, 2021

As developers, we rightfully obsess about the customer experience, relentlessly working to squeeze every millisecond out of the critical rendering path, optimize input latency, and eliminate jank. On top of this foundation, we add layers of caching, prerendering and edge delivery optimizations — not the other way around.

Cache 136

Cache Best Practices Strategy Servers 136

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. I ran the same suite of tests against the harry.is font-display: swap; For this test, I added the &display=swap back in.

Google 364

Google Media Latency Metrics 364

IO River

NOVEMBER 2, 2023

They cache static content and enable lightning-fast delivery around the globe.This symbiosis reduces server load, boosts loading times, and ensures efficient content distribution. Content Delivery Networks (CDNs), web browsers, and proxy servers can store static files in their caches.

Cache 52

Cache Social Media Website Performance Website 52

The Morning Paper

OCTOBER 4, 2020

We are standing on the eve of the 5G era… 5G, as a monumental shift in cellular communication technology, holds tremendous potential for spurring innovations across many vertical industries, with its promised multi-Gbps speed, sub-10 ms low latency, and massive connectivity. Throughput and latency. energy consumption).

Energy 130

Energy Latency Performance Network 130

The Netflix TechBlog

NOVEMBER 3, 2022

We introduce a caching mechanism in the API gateway layer, allowing us to offload processing from singleton leader elected controllers without giving up strict data consistency and guarantees clients observe. We started seeing increased response latencies and leader servers running at dangerously high utilization.

Cache 224

Cache Latency Traffic Systems 224

Brendan Gregg

AUGUST 29, 2021

Reads usually have apps waiting on them; writes may not (write-back caching). biolatency From [bcc], this eBPF tool shows a latency histogram of disk I/O. total used free shared buff/cache available Mem: 64414 15421 349 5 48643 48409 Swap: 0 0 0. This is a 64-Gbyte memory system, and 48 Gbytes is in the page cache.

Cache 105

Cache C++ AWS Latency 105

Percona

JUNE 22, 2023

This includes metrics such as query execution time, the number of queries executed per second, and the utilization of query cache and adaptive hash index. query cache: Disable (query_cache_size: 0, query_cache_type:OFF) innodb_adaptive_hash_index: Check adaptive hash index usage to determine its efficiency.

Performance 104

Performance Monitoring Traffic Database 104

Speed Curve

JUNE 18, 2019

With sufficient automated testing, you can have a high level of confidence that an isolated change can be built and integrated without breaking anything else. If any of the automated tests fail, then the build is broken and the change cannot be integrated. So where in a CI/CD pipeline do we put performance testing?

Performance Testing 49

Performance Testing Testing Performance Cache 49

The Morning Paper

OCTOBER 6, 2019

Prediction serving latency matters. Test the business impact of your models using randomised controlled trials (follows from #2). Lesson 4: prediction serving latency matters. In a experiment introducing synthetic latency, Booking.com found that an increase of about 30% in latency cost about 0.5%

Latency 102

Latency Metrics Cache Design 102

The Morning Paper

AUGUST 29, 2019

As it is infeasible to test every OLAP system runnable on AWS, we chose widely-used systems that represented a variety of architectures and cost models. InS does now offer an NVMe variant too, and the authors perform limited testing on that as well. Query performance is measured from both warm and cold caches. Key findings.

Architecture 76

Architecture Cloud Storage Serverless 76

The Netflix TechBlog

NOVEMBER 9, 2022

A quick canary test was free of errors and showed lower latency, which is expected given that our standard canary setup routes an equal amount of traffic to both the baseline running on 4xl and the canary on 12xl. What’s worse, average latency degraded by more than 50%, with both CPU and latency patterns becoming more “choppy.”

Hardware 363

Hardware Cache Performance Latency 363

Scalegrid

APRIL 16, 2020

Deploying your application and database on the same VPC also provides the lowest possible latency path. This becomes really important for cache solutions like Redis™. At ScaleGrid we recommend you deploy your clusters on private VPC subnets so that your database is not routable from the internet. Expert Tip. Security Groups.

Cloud 242

Cloud Azure AWS Database 242

CSS - Tricks

JULY 25, 2019

Cache-Headers missing? During performance tests, Lighthouse records many metrics focused on what a user sees and experiences. Estimated Input Latency. Estimated Input Latency. Service workers that will cache the bytecode result of a parsed and compiled script. After that, it’ll be mitigated by cache.

Google 71

Google Engineering Speed Mobile 71

Brendan Gregg

AUGUST 29, 2021

Reads usually have apps waiting on them; writes may not (write-back caching). biolatency From [bcc], this eBPF tool shows a latency histogram of disk I/O. This is a 64-Gbyte memory system, and 48 Gbytes is in the page cache (the file system cache). This shows many cache misses, with a hit ratio varying between 6.5

Cache 40

Cache C++ AWS Systems 40

The Netflix TechBlog

JUNE 14, 2023

The three strategies we will discuss today are AB Testing , Replay Testing, and Sticky Canaries. To launch Phase 1 safely, we used AB Testing. To launch Phase 2 safely, we used Replay Testing and Sticky Canaries. We knew we could test the same query with the same inputs and consistently expect the same results.

Traffic 353

Traffic Latency Cache Metrics 353

The Morning Paper

MAY 14, 2019

Last time around we looked at the DeathStarBench suite of microservices-based benchmark applications and learned that microservices systems can be especially latency sensitive, and that hotspots can propagate through a microservices architecture in interesting ways. on end-to-end latency) and less than 0.15% on throughput.

Big Data 45

Big Data Cloud Performance Hardware 45

O'Reilly Software

JUNE 12, 2018

This meant a lot of time was spent on things like cycle time analysis, build pipeline design, test automation, and infrastructure automation. How do you ensure this is done in a way that is sympathetic to your application’s latency and load conditions? But I kept hitting up against some fundamental issues.

Database 72

Database Cache Architecture Latency 72

KeyCDN

SEPTEMBER 12, 2019

Most of you have probably seen the following Google PageSpeed Insights optimization suggestion at one point or another when running a speed test: By compressing and adjusting the size of … you can save 14.2 KeyCDN’s Cache Enabler plugin is fully compatible the HTML attributes that make images responsive.

Social Media 106

Social Media Media Google Website 106

Rigor

DECEMBER 19, 2019

Test at Every Stage of Development. Synthetic monitoring can be used to test websites and web applications in pre-production, while real user monitoring can only be used in production. AB Test the Performance Impact of Third Parties. AB Test the Performance Impact of Third Parties. Benchmark Against Competitors.

Monitoring 40

Monitoring Benchmarking Website Traffic 40

KeyCDN

JANUARY 31, 2019

The next closest active POP location to Bucharest was Istanbul which was still almost 900km away; this distance adds up in terms of latency. Before the implementation of our Bucharest POP, Romanian users were delivered content from our surrounding KeyCDN POPs.

Internet 48

Internet Internet Ecommerce Speed 48

KeyCDN

OCTOBER 24, 2018

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. Before the implementation of our Helsinki POP, Finnish users were delivered content from our POP in Stockholm, Sweden.

Internet 48

Internet Internet Speed Network 48

The Symphonia

MAY 22, 2018

I was a little restricted in my thinking the first time around and I’ve come to see FaaS as something not quite stateless, since caching state in a Lambda instance that might stick around for 5 hours is a perfectly reasonable idea. I also rewrote the section on Startup Latency since Cold Starts are one of the big “FUD” areas of Serverless.

Serverless 40

Serverless Architecture Lambda Azure 40

CSS Wizardry

AUGUST 13, 2019

I was doing some cursory research and running a few tests against a potential client’s site so as to get a good understanding of the shape of things before we were to work together. To further exacerbate the problem, the 302 response has a Cache-Control: must-revalidate, private. Can you see it? View full size (31KB).

Latency 203

Latency Cache Strategy Media 203

Percona

APRIL 7, 2023

Here’s how the same test performed when running Percona Distribution for PostgreSQL 14 on these same servers: Queries: reads Queries: writes Queries: other Queries: total Transactions Latency (95th) MySQL (A) 1584986 1645000 245322 3475308 122277 20137.61 The throughput didn’t double but increased by 57%.

Tuning 135

Tuning Cache Servers Benchmarking 135

Percona

MARCH 20, 2023

When deciding what to pick, there are many things to consider, like where the proxy needs to be, if it “just” needs to redirect the connections, or if more features need to be in, like caching and filtering, or if it needs to be integrated with some MySQL embedded automation. micro) The tests We will have very simple test cases.

Games 120

Games Latency Traffic Cache 120

The Morning Paper

FEBRUARY 6, 2020

Last week we looked at a function shipping solution to the problem; Cloudburst uses the more common data shipping to bring data to caches next to function runtimes (though you could also make a case that the scheduling algorithm placing function execution in locations where the data is cached a flavour of function-shipping too).

Lambda 98

Lambda Serverless Cache Latency 98

Smashing Magazine

OCTOBER 31, 2023

It may even be something you do regularly with Lighthouse in Chrome DevTools, where testing is freely available and produces a very attractive-looking report. The linked-up explainer provides more details, from how scores are weighted to why scores may fluctuate between test runs. Can’t be perfect every time!

Speed 97

Speed Google Website Metrics 97

Scalegrid

JULY 29, 2020

Performance Testing. So, we pitted the two connection poolers head-to-head, using the standard pgbench tool, to see which one provides better transactions per second throughput through a benchmark test. For good measure, we ran the same tests without a connection pooler too. Testing Conditions. Pgpool-II Click To Tweet.

Benchmarking 246

Benchmarking Database Performance Testing Availability 246

The Netflix TechBlog

JULY 21, 2022

Some features (as an example) include Device Type ID, SDK Version, Buffer Sizes, Cache Capacities, UI resolution, Chipset Manufacturer and Brand. Restricting Testing and Analysis to one day and device at a time. all OOM kills with the tradeoff of lowering the performance/clearing the cache an extra 1.1%

Big Data 179

Big Data Cache Engineering Data Engineering 179

High Scalability

JULY 20, 2018

That means multiple data indirections mean multiple cache misses. lowrykoz : Stolen from a co-worker "Every company has a test environment. Mark LaPedus : MRAM, a next-generation memory type, is being touted as a replacement for embedded flash and cache applications. They are very expensive. This is where your performance goes.

Internet 121

Internet Internet Scalability Automotive 121

Smashing Magazine

MAY 16, 2022

Examples of this might be, expecting that the HTML is fully static, such that we can cache it downstream in some deterministic manner — “partially dynamic” HTML bodies are much more likely to be handled incorrectly by caching logic. Here are a few that come to mind: Is this request served from the service worker cache?

Servers 93

Servers Monitoring Cache Network 93