Brendan Gregg

AUGUST 29, 2021

A service team was debugging a performance issue and noticed it coincided with a high rate of paging. I was asked to help, and used a variety of performance tools to solve this including those that use eBPF and Ftrace. 1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03

Cache 105

Cache C++ AWS Latency 105

SQL Performance

SEPTEMBER 12, 2019

As an example with our task, suppose that you don't realize that the grouping element is determined implicitly, and you come up with the following query: SELECT shipperid , [ 2017 ] , [ 2018 ] , [ 2019 ] FROM Sales. So you're expecting to see only three rows in the result. 830 rows affected).

Best Practices 103

Best Practices C++ Code Design 103

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. As is exactly the same with PostgreSQL for system choice a 2 socket system is optimal for MySQL OLTP performance. order by c. c_ytd_payment: 10.00

Best Practices 40

Best Practices Scalability Performance C++ 40

Daniel Lemire

MARCH 18, 2019

In C or C++, you can safely convert from a stream of bytes to in-memory values using a function like ‘memcpy’ It is fast. However, Java offers a performance-oriented concept called a ByteBuffer to represent and array of bytes. An integer could be serialized as four bytes in a stream of bytes. array ) ; bb.

Java 124

Java C++ Code Speed 124

SQL Performance

OCTOBER 14, 2020

Here’s the attempted solution using a CTE: WITH C AS. ( Using our trick with the TOP filter in the inner query, you prevent the unnesting of the table expression, like so: WITH C AS. ( The following code returns only shippers with a maximum order date that is on or after January 1 st , 2018: USE PerformanceV5 ; WITH C AS. (

C++ 52

C++ Servers Code Efficiency 52

Brendan Gregg

OCTOBER 7, 2018

C @ns: [256, 512) 10900 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | [512, 1k) 18291 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| [1k, 2k) 4998 |@@@@@@@@@@@@@@ | [2k, 4k) 57 | | [4k, 8k) 117 | | [8k, 16k) 48 | | [16k, 32k) 109 | | [32k, 64k) 3 | |. Here's key differences as of August 2018: Type DTrace bpftrace. Attaching 2 probes. ^C

C++ 40

C++ Virtualization Programming Latency 40

Smashing Magazine

JANUARY 11, 2021

Front-End Performance Checklist 2021. Front-End Performance Checklist 2021. This guide has been kindly supported by our friends at LogRocket , a service that combines frontend performance monitoring , session replay, and product analytics to help you build better customer experiences. Web performance is a tricky beast, isn’t it?

Performance 145

Performance Cache Media Metrics 145

HammerDB

OCTOBER 8, 2018

This post gives a HOWTO guide on system configuration for achieving top levels of performance with the HammerDB PostgreSQL TPC-C test. Firstly for system choice a 2 socket system is optimal for PostgreSQL OLTP performance at the time of writing. Make sure that your CPU is configured for optimal performance.

Best Practices 40

Best Practices Scalability Performance Hardware 40

SQL Performance

OCTOBER 13, 2021

In our case, the plan performs a seek in the supporting index you created earlier. Combining the APPLY operator with an iTVF call, you can achieve the task nicely and cleanly, like so: SELECT C. Customers AS C CROSS APPLY Sales. GetTopCustOrders ( C. GetTopCustOrders ( C. custid , O. orderid , O.

Cache 144

Cache Strategy C++ Code 144

The Netflix TechBlog

APRIL 17, 2019

Scalable Video Technology (SVT) is Intel’s open source framework that provides high-performance software video encoding libraries for developers of visual cloud technologies. In 2018, AOM has published a specification for the AV1 video codec. An example of such development is the x264 encoder that has been improving years after the H.264

Open Source 166

Open Source Scalability Speed Efficiency 166

Sutter's Mill

JANUARY 11, 2021

And asserted conditions only evaluated if they’re enabled, so any side effects won’t happen when they’re not enabled; they might sometimes perform local side effects, such as to do logging or allocate memory, but the program should never rely on them happening or not happening. Assertions are only about finding bugs, not doing program work.

C++ 58

C++ Programming Code Testing 58

KeyCDN

SEPTEMBER 27, 2018

In 2018, this is absolutely essential for a number of reasons: Google favors HTTPS-secured sites HTTPS is required to use HTTP/2 HTTPS is required to use Brotli HTTPS helps improve performance, security, and trust If you’ve never heard of TLS, then maybe you’ve heard of the term SSL. Faster performance TLS 1.3

Transportation 67

Transportation C++ Network Google 67

ACM Sigarch

MARCH 18, 2019

Existing systems can be studied with measurement, while prospective systems are most often studied by extrapolating from measurements of prior systems or via simulation software that mimics target system function and provides performance metrics. Can one both minimize latency and maximize throughput for unscheduled work? Answered in Part 2.).

Systems 60

Systems Latency Performance Analytics 60

Smashing Magazine

DECEMBER 2, 2021

Good ol’ PerfPlanet is back for another season with all things speed and web performance. Anyone is welcome to contribute to the calendar , so do feel free to reach out with a topic or tool you’re passionate about, or a technique you’d like to teach and tell the web performance community about. C# Advent Calendar. Rock on! ??.

Design 107

Design Development Programming Website 107

ACM Sigarch

MARCH 25, 2019

The M/M/1 queue will show us a required trade-off among (a) allowing unscheduled task arrivals, (b) minimizing latency, and (c) maximizing throughput. He is a fellow of IEEE and the ACM, serves as Chair of the Computer Community Consortium (2018-20) and served as Wisconsin Computer Sciences Department Chair 2014-17.

Systems 53

Systems Latency Performance C++ 53

Brendan Gregg

AUGUST 29, 2021

A service team was debugging a performance issue and noticed it coincided with a high rate of paging. I was asked to help, and used a variety of Linux performance tools to solve this including those that use eBPF and Ftrace. 1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03

Cache 40

Cache C++ AWS Systems 40

Smashing Magazine

NOVEMBER 5, 2018

Improve Animated GIF Performance With HTML5 Video. Improve Animated GIF Performance With HTML5 Video. 2018-11-05T14:30:14+01:00. You can convert your GIF file to WebM by running the command below in the terminal: ffmpeg -i animated.gif -c vp9 -b:v 0 -crf 41 video.webm. Ayo Isaiah. 2019-04-29T18:34:58+00:00.

Performance 59

Performance Website C++ Open Source 59

Brendan Gregg

AUGUST 18, 2019

bpftrace is a new open source tracer for Linux for analyzing production performance problems and troubleshooting software. Linux already has many performance tools, but these are often counter-based and have limited visibility. 6 * 7 * Copyright 2018 Netflix, Inc. the "License") 9 * 10 * 13-Sep-2018 Brendan Gregg Created this.

Latency 68

Latency C++ Cache Programming 68

O'Reilly

JANUARY 13, 2020

As we noted last year, the release of Java 11 in September 2018 brought a raft of new features, including many that give the release a significant, clear advantage for using containers. “Originally, we were hoping async/await syntax could be part of the 2018 edition of Rust, but it took longer to get things right.”

Programming 130

Programming Java Google C++ 130

Percona

SEPTEMBER 13, 2018

2018-09-03.09 > mysql-slowquery.log.2018-09-03.09 2018-09-03.09 2018-09-03.09 system time, 43.80M rss, 141.48M vsz # Current date: Tue Sep 4 15:54:21 2018 # Hostname: aahmed-GL503VD # Files: mysql-slowquery.log.2018-09-03.09 2018-09-03.09 Run pt-query-digest on the log file. . $ user time, 2.5s user time, 2.5s

C++ 42

C++ AWS Open Source Testing 42

Brendan Gregg

FEBRUARY 9, 2018

The recently revealed [Meltdown and Spectre] bugs are not just extraordinary issues of security, but also performance. The patches that workaround Meltdown introduce the largest kernel performance regressions I've ever seen. Some older kernels have the KAISER patches for Meltdown, and so far the performance overheads look similar.

Performance 75

Performance Benchmarking Cache Tuning 75

Smashing Magazine

JANUARY 6, 2020

Front-End Performance Checklist 2020 [PDF, Apple Pages, MS Word]. Front-End Performance Checklist 2020 [PDF, Apple Pages, MS Word]. Web performance is a tricky beast, isn’t it? How do we actually know where we stand in terms of performance, and what our performance bottlenecks exactly are? Vitaly Friedman.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 7, 2019

Front-End Performance Checklist 2019 [PDF, Apple Pages, MS Word]. Front-End Performance Checklist 2019 [PDF, Apple Pages, MS Word]. Web performance is a tricky beast, isn’t it? How do we actually know where we stand in terms of performance, and what our performance bottlenecks exactly are? Vitaly Friedman.

Performance 103

Performance Cache Metrics Network 103

Sutter's Mill

FEBRUARY 25, 2021

Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for preconditions. [1] Rewrite the example in Question 1 to show how to approximate the same effect using assertions in today’s C++. This has the big benefit that it works using today’s C++. Yes: Callee-body checking only.

C++ 49

C++ Code Testing Systems 49

Sutter's Mill

FEBRUARY 8, 2021

2] Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for postconditions. [1] 2] Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for postconditions. [1] How can we approximate those advantages?

C++ 45

C++ Lambda Efficiency Code 45

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. Sat Mar 17 03:04:59 UTC 2018. With ccache, we can check the cache hit/miss stats with -s , clear the cache with -C , and clear the stats with -z. YMMV based on CPU and disk performance.

Speed 46

Speed Cache C++ Systems 46

Sutter's Mill

JANUARY 25, 2021

Example 1(a)’s min <= max is at this other end of the scale: It’s so dirt cheap to check that it’s unlikely we’ll ever have a performance reason to disable it. [2] P0542: Support for contract based programming in C++” (WG21 paper, June 2018). to distinguish safety-related checks vs. other checks). [2] Dos Reis, J.

C++ 45

C++ Programming Cache Testing 45

High Scalability

SEPTEMBER 28, 2018

MrTonyD : I was writing production code over 30 years ago (C, OS, database). . $2 billion : Pokémon GO revenue since launch; 10 : say happy birthday to StackOverflow; $148 million : Uber data breach fine; 75% : streaming music industry revenue in the US; 5.2 I acknowledge that. It is much worse to be a software developer now.

Internet 35

Internet Internet Scalability Blockchain 35

Tech News Gather

MAY 3, 2023

Over 2 million developers have used the Flutter toolkit since its introduction in 2018, as Tim Sneath, Flutter’s product manager, reported last year. ” Creating mobile applications used to be quite costly when the languages of choice were Objective C/Swift and Java/Kotlin. However, these alternate options could be better.

Mobile 40

Mobile Development Open Source Energy 40

Smashing Magazine

JUNE 30, 2021

The Problem Of Unpredictable Performance. At the same time, we have a widening performance gap. In terms for performance, these phones have plateaued at the performance of a 2012 iPhone. Applications built for the Web are expected to run on devices that fall anywhere on this broad performance spectrum.

Games 145

Games Architecture Code C++ 145

HammerDB

NOVEMBER 5, 2018

If you are new to running Oracle, SQL Server, MySQL and PostgreSQL TPC-C workloads with HammerDB and have needed to investigate I/O performance the chances are that you have experienced waits on writing to the Redo, Transaction Log or WAL depending on the database you are testing. Logging Waits. Checkpoint not complete.

Benchmarking 40

Benchmarking Database C++ Virtualization 40

Smashing Magazine

OCTOBER 26, 2018

2018-10-26T13:45:46+02:00. In recent years, the industry thankfully started paying more attention to performance. As a result, website performance can suffer. Improving performance with the decoupled JSON approach. Improving Performance With The Decoupled JSON Approach. Denis Žoljom. 2019-04-29T18:34:58+00:00.

Cache 78

Cache Website Speed Database 78

Brendan Gregg

FEBRUARY 8, 2018

The recently revealed [Meltdown and Spectre] bugs are not just extraordinary issues of security, but also performance. The patches that workaround Meltdown introduce the largest kernel performance regressions I've ever seen. Some older kernels have the KAISER patches for Meltdown, and so far the performance overheads look similar.

Performance 40

Performance Benchmarking Cache Tuning 40

The Morning Paper

DECEMBER 1, 2019

Moreover, for better performance, the processor may change the order in which writes reach the NVRAM, making it difficult for the NVRAM to even reflect a consistent prefix of the computation. Plus ça change, plus c’est la même chose. Performance evaluation. Instead the authors use the Epoch Based Reclamation scheme (EBR).

Efficiency 60

Efficiency Cache C++ Performance 60

Enprowess

NOVEMBER 2, 2021

Know the difference between Flutter vs React Native in terms of architecture, performance, community support, learning curve, use cases and many other aspects. Performance comparison. It was the peak of its popularity in 2018. It offers tools to build expressive and flexible user interfaces with native performance.

Development 52

Development Social Media Mobile Code 52

HammerDB

MAY 5, 2019

Fortunately the HammerDB TPC-C/OLTP workload intentionally has a great deal of contention between threads and is therefore ideal for testing spin-locks. Fortunately the HammerDB TPC-C/OLTP workload intentionally has a great deal of contention between threads and is therefore ideal for testing spin-locks. In the recent MySQL 8.0.16

Testing 48

Testing Tuning Latency Storage 48

HammerDB

NOVEMBER 30, 2018

This article Threads Done Right… With Tcl gives an excellent overview of these capabilities and it should be clear that to build a scalable benchmarking tool this thread performance and scalability is key. These bin and lib directories are not included with the source code. You can download and compile TCL/TK 8.6 HammerDB CLI v3.1

Architecture 40

Architecture Virtualization Open Source C++ 40