Brendan Gregg

SEPTEMBER 25, 2021

The broken Java stacks turned out to be beneficial: They helped group together the os::javaTimeMillis() calls which otherwise might have have been scattered on top of different Java code paths, appearing as thin stacks everywhere. Without NMI, some kernel code paths (interrupts disabled) can't be profiled. But I'm not completely sure.

Speed 40

Speed Java AWS Virtualization 40

The Netflix TechBlog

SEPTEMBER 10, 2019

This enables us to optimize their experience at speed. In order to replicate results, scientists had to delve deep into the data, code, and documentation. We’ve also made sure that both production and local workflows use the same code base, so reproducibility is a given and promotion to production is just a pull request away.

Metrics 215

Metrics Architecture Infrastructure Innovation 215

HammerDB

JUNE 27, 2022

This post is targeted towards the questions most often asked by non-technical management who want to get up to speed on what HammerDB is (what it isn’t) and how it can benefit their organization. In addition to the TPC-C specification for OLTP workloads, the TPC has also developed the TPC-E specification. What is HammerDB?

Benchmarking 62

Benchmarking Open Source C++ Cache 62

Enprowess

NOVEMBER 2, 2021

Quick Summary : A comparison of the two most widely used cross platform frameworks to build both iOS and Android mobile applications: React Native vs Flutter. Before starting with a detailed comparison, let us first overview both the frameworks React Native and Flutter. Performance comparison. Code Maintainability.

Development 52

Development Social Media Mobile Code 52

Smashing Magazine

JULY 19, 2021

Between an endless amount of code to make sure you’re providing full coverage and dealing with the fragile nature of front-end tests — where a simple selector change can completely break an end-to-end workflow — it can sometimes feel like an uphill battle. They’re all testing the code. add-to-cart').click();

Testing 142

Testing Code Design Strategy 142

Enprowess

MAY 24, 2022

It allows developers to create complex UIs from a small and isolated code called “components” ReactJS comprises two parts: the pieces containing HTML code, components, and an HTML document – where all your components will render. More incredible Speed with Virtual DOM. Platform-specific code.

Mobile 52

Mobile Open Source Virtualization Speed 52

Smashing Magazine

AUGUST 9, 2019

In this article, we’ll start by exploring the impact unused CSS can have on page load speeds. So typically you have to write custom code to exclude any 3rd party scripts when a headless browser is detected, which depending on your setup, may be tricky. Measuring The Impact Of Unused CSS Classes. dist/index.html. <div

Performance 94

Performance C++ Media Website 94

Smashing Magazine

JANUARY 11, 2021

Have we optimized enough with tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, progressive hydration, clients hints, HTTP/3, service workers and — oh my — edge workers? Note : If you use Page Speed Insights or Page Speed Insights API (no, it isn’t deprecated!),

Performance 145

Performance Cache Media Metrics 145

Testsigma

JUNE 15, 2021

Based on that, developers should turn in their code, ensuring enough time for the testers to carry out dependent testing activities. We need more than just an automation tool for performing in-sprint testing, as in-sprint testing requires speed, accuracy, flexibility, and ease of adaptability. Very affordable. Sign up Now.

Testing 52

Testing DevOps Mobile Testing Tools 52

Testsigma

APRIL 16, 2021

Appium gives us the freedom to write scripts in any language of our choice, like Java, Ruby, C#, Javascript, PHP, Python. Speed matters and the Appium framework is relatively slow because of its architecture. The following piece of code is an example of how it can manipulate or trigger actions on devices.

Testing 52

Testing Open Source Mobile Java 52

Testsigma

JANUARY 18, 2021

Along with testing on different network conditions, you should also check the app’s behaviour with different UL (Upload) and Download (DL) speeds. The usage of Selenium requires understanding about the framework and programming languages like C#, Python, Java, PHP, etc. UTC, EST. MST, etc.). You can read more about Testsigma here.

Testing 55

Testing Operating System Website Internet 55

Brendan Gregg

AUGUST 8, 2017

Nowadays, the source code to old operating systems can also be found online. TABLE OF EXP(-T/C) FOR T = 5 SEC. EXPFF: EXP 0.920043902 ;C = 1 MIN EXP 0.983471344 ;C = 5 MIN EXP 0.994459811 ;C = 15 MIN. Linux is also hard coding the 1, 5, and 15 minute constants. This, too, was a dead end.

Latency 111

Latency Metrics C++ Systems 111

SQL Performance

SEPTEMBER 5, 2019

CREATE CLUSTERED COLUMNSTORE INDEX c ON #T WITH ( MAXDOP = 1 ) ; Run the following test queries against the new columnstore table: SELECT. c = COUNT_BIG ( * ) FROM #T AS T WHERE 1 = ( SELECT 1 ) -- Avoid trivial plan. c = COUNT_BIG ( * ) FROM #T AS T WHERE 1 = ( SELECT 1 ) -- Avoid trivial plan.

Performance 81

Performance C++ Storage Servers 81

Smashing Magazine

JANUARY 6, 2020

Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? It’s much easier to reach performance goals when the code base is fresh or is just being refactored.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 7, 2019

Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? Start Render time, Speed Index ). Rendering metrics provide an estimate of how fast content renders (e.g.

Performance 104

Performance Cache Network Metrics 104

HammerDB

OCTOBER 12, 2018

This post complements the previous best practice guides this time with the focus on MySQL and MariaDB and achieving top levels of performance with the HammerDB MySQL TPC-C test. SELECT DISTINCT c from sbtest where id between ? order by c. SELECT c from sbtest where id=? 10 rows in set (0.02 current CPU frequency: 1.99

Best Practices 40

Best Practices Scalability Performance C++ 40

Smashing Magazine

AUGUST 22, 2021

A Primer on Speed. Discussing performance and “speed” can quickly get complex, because many underlying aspects contribute to a web-page loading “slowly”. It is physically limited by the speed of light or, practically, how fast signals can travel in wires or in the open air. also “only” take two round trips ((b) is rarely shown).

Performance 106

Performance Network Latency Servers 106

Smashing Magazine

OCTOBER 26, 2018

When it comes down to how WordPress is programmed, one thing is certain: it doesn’t follow the M odel- V iew- C ontroller (MVC) design pattern that many developers are familiar with. Before we delve deeper in the code, a couple more things about WordPress REST API. The downside of using it is its speed. Large preview ).

Cache 78

Cache Website Speed Database 78

Alex Russell

MAY 9, 2022

Who owns this code? This blindspot usually extends up to the C-suite. Treating data as a distribution fundamentally enables comparison and experimentation because it creates a language for describing non-binary shifts. The speed of a client device isn't the limiting site speed factor in an HTML-first world.

Performance 86

Performance Latency Metrics Engineering 86

Brendan Gregg

SEPTEMBER 5, 2017

It uses a Solaris Porting Layer (SPL) to provide a Solaris-kernel interface on Linux, so that unmodified ZFS code can execute. There's also a ZFS send/recv code path that should try to use the TASK_INTERRUPTIBLE flag (as suggested by a coworker), to avoid a kernel hang (can't kill -9 the process). Hit Ctrl-C to end. ^C

Virtualization 76

Virtualization AWS Engineering Hardware 76

SQL Server According to Bob

JANUARY 11, 2020

Character POS ASCII Value Formula Value A 1 65 67 C 2 67 69 Checksum 136 Comparing ​​ the checksum values indicates ​​ that the values do not match and ​​ damage ​​ has occurred to the data. SQL Server uses read-ahead logic to avoid query stalls caused by I/O waits.

Servers 40

Servers Cache Database Media 40