Brendan Gregg

SEPTEMBER 5, 2021

Next Steps I'd usually SSH to instances for deeper analysis, where I could use mpstat(1) to confirm the usr/sys breakdown and perf(1) to begin profiling on-CPU kernel code paths. The other colors are yellow for C++, and red for other user-level code.) I worked on this code back at Sun. contending for the same locks).

Cache 145

Cache Cloud Java Tuning 145

Sutter's Mill

JUNE 2, 2012

I’ve been beating the drum this year (see the last section of the talk) that the biggest problem facing C++ today is the lack of a large set of de jure and de facto standard libraries. To help solve that problem, today we open sourced an initial release of Folly, a collection of reusable C++ library artifacts developed and used at Facebook.

C++ 42

C++ Open Source Tuning Cloud 42

Adrian Cockcroft

JUNE 21, 2022

I was mostly coding in C, tuning FORTRAN, and when I needed to do a lot of data analysis of benchmark results used the S-PLUS statistics language, that is the predecessor to R. Rich became co-author of the second edition of the Sun Performance Tuning book, to describe how it worked. He had it up and running on Wednesday.

Tuning 52

Tuning Benchmarking Engineering C++ 52

Smashing Magazine

DECEMBER 2, 2021

Advent of Code. If you prefer a puzzle over an article, take a look at Advent of Code. Stay tuned for lots of articles on metaprogramming, applications, useful Raku modules, programming techniques, guides on how to work with Raku inside containers, and even how to migrate from good ol’ Perl. C# Advent Calendar.

Design 109

Design Development Programming Website 109

HammerDB

APRIL 19, 2023

GHz 4th Generation Intel Xeon Scalable processors (code-named Sapphire Rapids) Up to 20% higher compute performance than z1d instances Up to 50 Gbps of networking speed Up to 40 Gbps of bandwidth to the Amazon Elastic Block Store (EBS) We can also verify these capabilities by running some simple benchmarks on the different subsystems.

Performance 54

Performance Benchmarking Cache Storage 54

HammerDB

JULY 14, 2021

adds full support for MariaDB in both the GUI as shown: And in the CLI as a separate database from MySQL, this post describes a setup and test for MariaDB using the CLI on Linux as an example running the TPROC-C workload. dbset db maria dbset bm TPC-C diset connection maria_socket /tmp/mariadb10234.sock HammerDB v4.2 linux-x86_64.tar.gz

Testing 57

Testing C++ Virtualization Tuning 57

SQL Performance

DECEMBER 9, 2020

Use the following code to run a test with base CTE cardinality of 2 (requires 5 additional levels of CTEs): DECLARE @low AS BIGINT = 1 , @high AS BIGINT = 100000000 ; WITH. Make sure that you enable Discard results after execution in your SSMS Query Options dialog under Grid, Results.

C++ 61

C++ Servers Testing Processing 61

Sutter's Mill

MAY 28, 2012

It’s time for, not one, but two brand-new, up-to-date talks on the state of the art of concurrency and parallelism in C++. I’m going to put them together especially and only for C++ and Beyond 2012 , and I’ll be giving them nowhere else this year: C++ Concurrency – 2012 State of the Art (and Standard). And there’s a lot to tell.

C++ 40

C++ Hardware Best Practices Tuning 40

Brendan Gregg

OCTOBER 8, 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 | |. ply is also C, whereas bpftrace is C++. # Attaching 2 probes. ^C

C++ 110

C++ Virtualization Programming Latency 110

Percona

JANUARY 28, 2019

EverSQL (use code PERCONA-EVERSQL-10OFF for a 10% discount on the first billing cycle) is a platform that intelligently tunes your SQL queries by providing query optimization recommendations, and feedback on missing indexes. So what was the actual optimization in this specific case? And why did it work so well? Co-Author: Tomer Shay.

Monitoring 42

Monitoring C++ Tuning Analytics 42

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. Copyright (C) 2003-2018 Steve Shaw. In the recent MySQL 8.0.16 in the directory storage/innobase/ut the following section has UT_RELAX_CPU defined to call the PAUSE instruction on x86.

Testing 48

Testing Tuning Latency Storage 48

Brendan Gregg

SEPTEMBER 5, 2021

Next Steps I'd usually SSH to instances for deeper analysis, where I could use mpstat(1) to confirm the usr/sys breakdown and perf(1) to begin profiling on-CPU kernel code paths. The other colors are yellow for C++, and red for other user-level code.) I worked on this code back at Sun. contending for the same locks).

Cache 52

Cache Cloud Java Tuning 52

SQL Performance

OCTOBER 29, 2019

Borrowing and adapting code from a previous post, Examining the Performance Impact of an Adhoc Workload , we will first create two stored procedures. CustomerID , c. Customers c JOIN Sales. CustomerTransactions ct ON c. GROUP BY c. CustomerID , c. Example Scenario. AccountOpenedDate , COUNT ( ct.

C++ 74

C++ Database Servers Tuning 74

Brendan Gregg

SEPTEMBER 5, 2021

Next Steps I'd usually SSH to instances for deeper analysis, where I could use mpstat(1) to confirm the usr/sys breakdown and perf(1) to begin profiling on-CPU kernel code paths. The other colors are yellow for C++, and red for other user-level code.) I worked on this code back at Sun. contending for the same locks).

Cache 40

Cache Cloud Java Tuning 40

Rigor

JANUARY 13, 2020

Steve Souders, plus Dion Almaer, Doug Crockford, Ben Galbraith, Tony Gentilcore, Dylan Schiemann, Stoyan Stefanov, Nicole Sullivan, Nicholas C. The in-depth explorations are meticulously illustrated and code examples culminate as bulletproof code snippets, applicable to your work right away. Web Performance Tuning.

Performance 75

Performance Social Media Website Website Performance 75

Sutter's Mill

DECEMBER 4, 2012

On yesterday’s thread, I just wrote in a comment: @Jon: Yes, C++ is complex and the complexity is largely because of C compatibility. So just as C++ ‘won’ in the 90s because of its own strengths plus its C compatibility, C++11 is being adopted because of its own strengths plus its C++98 compatibility.

C++ 40

C++ Tuning Programming Engineering 40

Sutter's Mill

MAY 4, 2011

Channel 9 just posted a new interview with me about ISO C++0x, C++’s place in the modern world, and all things C++. As usual when talking to Herb, the conversation is all about C++ (well, we do talk about C# for a little while, but in the context of C++. Tune in…). Go native!

C++ 40

C++ Tuning Programming Mobile 40

Percona

MARCH 7, 2019

In other words, the time the CPU was executing user code, such as MySQL. c) From there you can divert into the areas that are related to that resource and start to narrow down the issue. It’s important to understand where the CPU time is being consumed: user space, system space, iowait, and so on. Increase QPS by 2x.

C++ 98

C++ Traffic Servers Monitoring 98

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 | |. ply is also C, whereas bpftrace is C++. # Attaching 2 probes. ^C

C++ 40

C++ Virtualization Programming Latency 40

Percona

SEPTEMBER 13, 2018

A quick web search revealed that it could be a regression of an old bug in MySQL’s code. Incorrect logging. The above two queries are, in fact, really fast, but for some reason the execution time & lock times are wrongly logged in the slow query log. That number looks familiar.

C++ 42

C++ AWS Open Source Testing 42

Scalegrid

OCTOBER 7, 2019

The supported programming languages for PostgreSQL include.Net, C, C++, Delphi, Java, JavaScript (Node.js), Perl, PHP, Python and Tcl, but PostgreSQL can support many server-side procedural languages through its available extensions. The programming language C came in third place, averaging 20.0% Java #Python #C Click To Tweet.

Strategy 182

Strategy Cloud Java Open Source 182

The Netflix TechBlog

DECEMBER 7, 2020

Through low-level code optimization and vectorization, we sped up VMAF’s execution by more than 4x in the past. Also notice that this is an ongoing effort, so stay tuned for more speed improvements. For historical reasons, the libvmaf C library has been a minimal solution to integrate VMAF with FFmpeg.

Metrics 154

Metrics Open Source Tuning Speed 154

Dynatrace

DECEMBER 8, 2020

Teams are embracing new technologies and continuously deploying code. In addition, c loud – native environments with containers, microservices, and platforms like Kubernetes are highly dynamic. Dynatrace provides the C-suite with confidence about the security of their cloud-native ecosystem.

Cloud 284

Cloud Open Source Internet Internet 284

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 126

Speed Java AWS Virtualization 126

The Netflix TechBlog

AUGUST 29, 2023

IPC clients are instantiated targeting that VIP or SVIP, and the Eureka client code handles the translation of that VIP to a set of IP and port pairs by fetching them from the Eureka server. If service A needs to talk to clusters B and C, then you need to define clusters B and C as part of A’s proxy config.

Traffic 220

Traffic Latency Cloud C++ 220

Percona

AUGUST 30, 2023

If a PostgreSQL user wants to change these values, they need to recompile the PostgreSQL from the source code. psql "host=localhost user=postgres options='-c synchronous_commit=off'" psql (14.8) Changing these values at compile time is not intended for common use. Some are exposed through the configure command line option.

Database 97

Database Servers Open Source Tuning 97

SQL Performance

APRIL 8, 2020

When I read C. I do recognize and firmly believe that a good understanding of relational theory translates directly to a better understanding of SQL and T-SQL, and to writing better, more accurate, and more robust T-SQL code. As mentioned earlier, I use the term table expression following C. My expertise is T-SQL.

C++ 143

C++ Database Azure Servers 143

Percona

OCTOBER 17, 2023

Many changes and new features are brought to the system, and as part of keeping in tune with the changes and how they can impact us, we go through the changes to better understand them. As almost a tradition, a newer major release of MongoDB is born every year, and this year, it’s no different. From that, this article is born.

Metrics 96

Metrics C++ Storage Database 96

HammerDB

FEBRUARY 25, 2021

For HammerDB both TPROC-C and TPROC-H run all of their workloads on the database being tested in SQL. The following is an example from TPROC-C from SQL Server. TPROC-C however is derived from the TPC-C specification and requires application logic around the SQL. Database interfaces in C. select top 100.

Programming 67

Programming Benchmarking Virtualization C++ 67

CSS Wizardry

NOVEMBER 3, 2020

I want to be able to form hypotheses and draw conclusions without viewing a single URL or a line of source code. For now, I’m usually sat with a coffee, some tunes on, and an old-school pen and paper making notes. All of this information gleaned without having to visit a single page or view a single line of source code.

Speed 292

Speed Ecommerce Metrics Analytics 292

Dynatrace

APRIL 24, 2019

Even if this is true, in practise there is only so much the one Agent can Autodiscover and fine tuning might be required. I have worked with many customers and I found that in most cases, 90% of what was mapped automatically was fine however the remaining 10% needed fine tuning due to bad deployment practises.

Systems 122

Systems Tuning C++ Processing 122

Dynatrace

JUNE 13, 2019

Dynatrace has been building automated application instrumentation—without the need to modify source code—for over 15 years already. Driving the implementation of higher-level APIs—also called “typed spans”—to simplify the implementation of semantically strong tracing code. What are the benefits of the Dynatrace contribution?

IoT 45

IoT C++ Analytics Java 45

O'Reilly

SEPTEMBER 19, 2023

” Each step has been a twist on “what if we could write code to interact with a tamper-resistant ledger in real-time?” Mental contortions led to code contortions led to frustration. You can download these models to use out of the box, or employ minimal compute resources to fine-tune them for your particular task.

Hardware 101

Hardware Storage Big Data Blockchain 101

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

Brendan Gregg

FEBRUARY 9, 2018

In this post I'll look at the Linux kernel page table isolation (KPTI) patches that workaround Meltdown: what overheads to expect, and ways to tune them. Hit Ctrl-C to end. and 6% overhead with KPTI due to our syscall rates, and I'm expecting we'll take that down to less than 2% with tuning: using 4.14 and 4.14.12

Performance 75

Performance Benchmarking Cache Tuning 75

Smashing Magazine

APRIL 13, 2020

On top of basic font style properties, we can now reliably fine-tune OpenType figures, hyphenation, ligatures, and even kerning. SVG includes other properties which fine-tune aspects of a stroke. Typography controls in CSS have helped us be more creative with type too. Black and light weights, negative tracking and tight leading.

Design 117

Design Media C++ Technology 117

Smashing Magazine

AUGUST 9, 2021

However, many other devices are sitting between the client and the server that also have their own TCP code on board (examples include firewalls, load balancers, routers, caching servers, proxies, etc.). For example, if we have files A, B, and C, we would have three TCP connections. For HTTP/1.1, Large preview ).

Transportation 145

Transportation Internet Internet Network 145