ACM Sigarch

MARCH 25, 2019

The M/M/1 queue also assumes that the arrival rate is not affected by the unbounded number of tasks in the queue (called an “open system”). For the previous cache miss buffer example, the 32-buffer answer is minimal for 100-ns average miss latency. Figure 2 plots the M/M/1 queue’s latency-throughput trade-off.

Systems 53

Systems Latency Performance C++ 53

Percona

MAY 1, 2023

This blog was originally published in August 2018 and was updated in May 2023. It is primarily the responsibility of the database administrator or developer to tune PostgreSQL according to their system’s workload. Out of the box, the default PostgreSQL configuration is not tuned for any particular workload.

Tuning 52

Tuning Efficiency Database Performance 52

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 avg-cpu: %user %nice %system %iowait %steal %idle 14.81 avg-cpu: %user %nice %system %iowait %steal %idle 14.86 avg-cpu: %user %nice %system %iowait %steal %idle 14.95 Output every 1 seconds. 17 48011 [.]

Cache 40

Cache C++ AWS Systems 40

Smashing Magazine

OCTOBER 26, 2018

2018-10-26T13:45:46+02:00. WordPress core developers used a system of hooks which allowed other developers to modify or extend certain functionalities. Headless WordPress: The Ups And Downs Of Creating A Decoupled WordPress. Headless WordPress: The Ups And Downs Of Creating A Decoupled WordPress. Denis Žoljom. post_slug || !

Cache 78

Cache Website Speed Database 78

SQL Server According to Bob

DECEMBER 18, 2018

Durability: “In database systems , durability is the ACID property which guarantees transactions that have committed will survive permanently. For example, if a flight booking reports that a seat has successfully been booked, then the seat will remain booked even if the system crashes.” – [link]. The Back Story.

Servers 90

Servers Media Cache Storage 90

Nick Desaulniers

JUNE 2, 2018

ccache , the compiler cache, is a fantastic way to speed up build times for C and C++ code that I previously recommended. Usually when this happens with ccache, there’s something non-deterministic about the builds that prevents cache hits. . $ Sat Mar 17 03:04:59 UTC 2018. Cold Cache. kB max cache size 5.0

Speed 46

Speed Cache C++ Systems 46

SQL Server According to Bob

FEBRUARY 5, 2018

system but not on my Centos 7 system joined to the same domain (realm.) I followed the common guidance for using Active Directory with SQL Server on Linux – no luck. Default DNS naming was incorrectly set causing the system to appear at RDORRLinux.DOMAINNAME.guest.microsoft.com instead of RDORRLinux.DOMAINNAME. conf files.

Servers 40

Servers Code Cache Traffic 40

Brendan Gregg

AUGUST 18, 2019

BPF has been extended (aka eBPF) in recent years for providing a safe way to extend kernel functionality, and has become a hot topic in systems engineering, with at least 24 talks on BPF at the last Linux Plumber's conference. system(".") 6 * 7 * Copyright 2018 Netflix, Inc. Builtin variables include: Variable Description.

Latency 68

Latency C++ Cache Programming 68

All Things Distributed

JUNE 20, 2017

The new AWS Asia Pacific (Hong Kong) Region will have three Availability Zones and be ready for customers for use in 2018. Beyond running their web properties and applications, Next Digital also uses Amazon RDS (database), Amazon ElastiCache (caching), and Amazon Redshift (data warehousing).

AWS 149

AWS Logistics Cloud Social Media 149

Rigor

SEPTEMBER 3, 2019

In one high-profile example, Amazon dealt with significant outages on Prime Day 2018 , which may have cost them as much as $99 million in sales. JCrew’s site went down on Black Friday 2018 for five hours , costing the company more than $700,000 in sales and impacting approximately 323,000 shoppers. Case studies abound.

Website 74

Website Cache Ecommerce Traffic 74

The Morning Paper

JUNE 20, 2019

In total, there were 112 such incidents over the period March – September 2018 (not all of them affecting external customers). TLA+ is used to model concurrent and distributed system protocols helping to eliminate high level design and semantic bugs. I’d expect this class of bugs to also surface in microservices systems.

Cloud 81

Cloud Azure Cache C++ 81

MachMetrics

DECEMBER 14, 2019

Similar to our article Average Page Load Times for 2018 , we’ll go over the averages for metrics and help you determine if your site is faster or slower than average. It is typically reduced via server-side optimizations, such as enabling caching and database indexes. Source: ThinkWithGoogle. seconds on desktop and 2.59

Best Practices 105

Best Practices Speed Mobile Google 105

Smashing Magazine

JANUARY 21, 2021

We never used CSS-in-JS or styled-components, but instead a good ol’ component-based system of Sass-modules which would be compiled into CSS. Plus a service worker that caches all static assets and serves them for repeat views, along with cached versions of articles that a reader has already visited. KB, Brotlified).

Performance 145

Performance Cache Mobile Network 145

Smashing Magazine

JANUARY 11, 2021

Build Optimizations JavaScript modules, module/nomodule pattern, tree-shaking, code-splitting, scope-hoisting, Webpack, differential serving, web worker, WebAssembly, JavaScript bundles, React, SPA, partial hydration, import on interaction, 3rd-parties, cache. This improves page load time and caching during navigations.

Performance 145

Performance Cache Media Metrics 145

Alex Russell

APRIL 29, 2021

After 20 years of neck-in-neck competition, often starting from common code lineages, there just isn't that much left to wring out of the system. Consistent improvement is the name of the game, and it can still have positive impacts, particularly as users lean on the system more heavily over time. Pointer Lock. Media Recorder.

Media 145

Media Games Education Engineering 145

Brendan Gregg

FEBRUARY 9, 2018

This overhead can be reduced by A) pcid, fully available in Linux 4.14, and B) Huge pages. - **Cache access pattern**: the overheads are exacerbated by certain access patterns that switch from caching well to caching a little less well. Also microbenchmarks, which often stress-test the system, will suffer the largest losses.

Performance 75

Performance Benchmarking Cache Tuning 75

HammerDB

NOVEMBER 5, 2018

To illustrate the data reads on Oracle we can flush the buffer cache. SQL> alter system flush buffer_cache; System altered. However what if in a test environment you cannot upgrade the log I/O but want to move beyond the log bottleneck to be able to test other system components more fully. so what are your options?

Benchmarking 40

Benchmarking Database C++ Virtualization 40

KeyCDN

SEPTEMBER 12, 2019

This can be a problem in a lot of content management systems such as WordPress or Magento, because theme developers tend to scale images down in responsive themes using CSS. KeyCDN’s Cache Enabler plugin is fully compatible the HTML attributes that make images responsive. It is usually recommended that you upload images at scale.

Social Media 106

Social Media Media Google Website 106

Randon ASCII

FEBRUARY 25, 2018

See the end of the post for an October 2018 bug fix update, or read the whole story: Flaky failures are the worst. This was starting to look like a Windows file cache bug. Maybe something to do with multi-socket coherency of the disk and cache or ??? Update, October 2018.

Programming 79

Programming Hardware Cache Code 79

Smashing Magazine

JANUARY 7, 2019

You could go as far as evaluating a framework (or any JavaScript library) on Sacha Greif’s 12-point scale scoring system by exploring features, accessibility, stability, performance, package ecosystem, community, learning curve, documentation, tooling, track record, team, compatibility, security for example. Other options are available , too.

Performance 103

Performance Cache Metrics Network 103

Smashing Magazine

JANUARY 6, 2020

Globally in 2018–2019, according to the IDC, 87% of all shipped mobile phones are Android devices. PRPL stands for Pushing critical resource, Rendering initial route, Pre-caching remaining routes and Lazy-loading remaining routes on demand. In exchange, your team gains maintainability and developer efficiency, of course.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

OCTOBER 31, 2023

The truth is that the two tools were fairly distinct until PSI was updated in 2018 to use Lighthouse reporting. If throttling is applied at the operating system level , then the metrics match what a real user with those network conditions would experience. The accuracy of observed data depends on how the test environment is set up.

Speed 97

Speed Google Website Metrics 97

Percona

AUGUST 10, 2018

In fact, you should not set it to OFF in a production system unless you are 100% sure about what you are doing and its implications. sec < 2018-08-06 07:22:35.199 EDT > LOG: automatic analyze of table "vactest.scott.employee" system usage: CPU 0.00s/0.02u sec elapsed 0.15 You May Also Like.

Tuning 44

Tuning Cache Database Storage 44

Alex Russell

MARCH 6, 2021

A then-representative $200USD device had 4-8 slow (in-order, low-cache) cores, ~2GiB of RAM, and relatively slow MLC NAND flash storage. India became a 4G-centric market sometime in 2018. The Moto G4 , for example. 2] Getting accurate global information that isn't artificially reduced to averages remains an ongoing challenge.

Performance 124

Performance Network Cache Metrics 124

Brendan Gregg

FEBRUARY 8, 2018

This overhead can be reduced by A) pcid, fully available in Linux 4.14, and B) Huge pages. - **Cache access pattern**: the overheads are exacerbated by certain access patterns that switch from caching well to caching a little less well. Also microbenchmarks, which often stress-test the system, will suffer the largest losses.

Performance 40

Performance Benchmarking Cache Tuning 40

Sutter's Mill

JANUARY 25, 2021

Not only is the integer comparison operation cheap, but min and max are already being accessed by this function and so they’re already “hot” in registers or cache. If you develop your own assertion system for in-house use, support enabling/disabling at least these kinds of assertions independently. [1] Dos Reis, J. Meredith, N.

C++ 45

C++ Programming Cache Testing 45

Smashing Magazine

JANUARY 15, 2019

The Mozilla Internet Health Report 2018 states that — especially as the Internet expands into new territory — “sustainability should be a bigger priority.” For the more adventurous/technical, the top (table of processes) command provides similar metrics on most Unix-like operating systems such as macOS and Ubuntu.

Website Performance 73

Website Performance Website Energy Performance 73

Jos

JUNE 2, 2018

presented in Google IO 2018 ( source ) These tools make it easier to determine where we need to put emphasis to improve our sites. How would you architecture a non-trivial size web project (client, server, databases, caching layer)? They can be run as a one-off or integrated in our development and deployment pipelines.

Performance 237

Performance Speed Google Media 237

SQL Performance

JULY 16, 2019

I wrote a number of blog posts about this back in January 2018, including these: Checking Your SQL Server Instance for Spectre/Meltdown Patches. They will also have up to 256MB of L3 cache per processor. Checking Your Meltdown and Spectre Mitigation Status in Windows.

Servers 46

Servers Hardware Architecture Retail 46

Smashing Magazine

JUNE 30, 2021

iOS empowers developers to easily parallelize code using Grand Central Dispatch , Android does this via their new, unified task scheduler WorkManager and game engines like Unity have job systems. On design systems, CSS/JS and UX. Paul Lewis and I once explored actor-centric app architecture at Chrome Dev Summit 2018.

Games 145

Games Architecture Code C++ 145

High Scalability

JULY 20, 2018

The third wing of the architecture piece is the “domain specific system-on-chip.” That means multiple data indirections mean multiple cache misses. tef : You can use a message broker to glue systems together, but never use one to cut systems apart. They are very expensive. This is where your performance goes.

Internet 121

Internet Internet Scalability Automotive 121

Alex Russell

OCTOBER 22, 2017

Tools and CI systems help them monitor progress & prevent regressions. Some systems show median RTTs near ~100ms for 3G users. Given the conflicted data we see across our other systems, this seems about right as a baseline. Think back: your framework of choice might be 40K, but what about that data system?

Performance 68

Performance Benchmarking Network Mobile 68

Enprowess

MARCH 10, 2022

It has used Angular to create the PayPal checkout system that contains essential features such as a payment review page and adding MasterCard pages. It depends on you how skillfully you utilize the combination of JSON and client-side caching to boost the server-side performance. It has a Dependency injection system built in JSON.

Development 52

Development Google Open Source Servers 52

Randon ASCII

AUGUST 16, 2018

As usual I had UIforETW running in the background, tracing to circular buffers, so I just had to type Ctrl+Win+R and the buffers, representing the last thirty seconds or so of system activity, were saved to disk. The CFG memory block is best thought of a cache with bounded size. But it’s not. Well, that’s not quite true.

Programming 75

Programming Virtualization Code Processing 75

Jos

JUNE 2, 2018

presented in Google IO 2018 ( source ). Security : Hopefully there’s a team or individual with deep knowledge about security that help us reviewing system designs, implementations, and informs us about reports or and security patches. How would you architecture a non-trivial size web project (client, server, databases, caching layer)?

Performance 130

Performance Speed Google Media 130

Abhishek Tiwari

DECEMBER 27, 2017

There are several emerging data trends that will define the future of ETL in 2018. In 2018, we anticipate that ETL will either lose relevance or the ETL process will disintegrate and be consumed by new data architectures. In contrast, Alluxio a middleware for data access - think Alluxio storage layer as fast cache.

Big Data 49

Big Data Artificial Intelligence Storage Hardware 49

The Netflix TechBlog

JULY 1, 2019

Our UI runs on top of a custom rendering engine which uses what we call a “surface cache” to optimize our use of graphics memory. Surface Cache Surface cache is a reserved pool in main memory (or separate graphics memory on a minority of systems) that the Netflix app uses for storing textures (decoded images and cached resources).

Cache 166

Cache Design Testing Development 166