Brendan Gregg

OCTOBER 8, 2018

Created by Alastair Robertson , bpftrace is an open source high-level tracing front-end that lets you analyze systems in custom ways. more capable, and built from the ground up for the modern era of the eBPF virtual machine. eBPF (extended Berkeley Packet Filter) is in the Linux kernel and is the new hotness in systems engineering.

C++ 110

C++ Virtualization Programming Latency 110

Brendan Gregg

DECEMBER 31, 2018

eBPF should stand for something meaningful, like Virtual Kernel Instruction Set (VKIS), but due to its origins it is extended Berkeley Packet Filter. So instead of a static HTML website, JavaScript lets you define mini programs that run on events like mouse clicks, which are run in a safe virtual machine in the browser.

C++ 52

C++ Virtualization Programming Code 52

Brendan Gregg

AUGUST 18, 2019

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 | |. The probe is BEGIN , a special probe that runs at the beginning of the program (like awk).

Latency 68

Latency C++ Cache Programming 68

Nick Desaulniers

OCTOBER 24, 2018

Typically, when we modify a program, we’d like to run it to verify our changes. Before booting a compiled Linux kernel image on actual hardware, it can save us time and potential headache to do a quick boot in a virtual machine like QEMU. qemu-system-x86_64. qemu-system-x86_64 -kernel arch/x86_64/boot/bzImage. enable-kvm.

C++ 56

C++ Hardware Virtualization Systems 56

Alex Podelko

OCTOBER 28, 2016

This is the mainstream approach to load testing: recording communication between two tiers of the system and playing back the automatically created script (usually, of course, after proper correlation and parameterization). Such tool can only be used if it supports the specific protocol used for communication between two tiers of the system.

Performance Testing 100

Performance Testing Technology Technology Testing 100

Adrian Cockcroft

JUNE 21, 2022

Photo by Adrian I spent six years at Cambridge Consultants, building some interesting systems, managing our Sun workstations and learning a lot, but by then Sun had opened a sales office across the street, and I wanted to find out what they were going to release next, before everyone else.

Tuning 52

Tuning Benchmarking Engineering C++ 52

Nick Desaulniers

MAY 30, 2016

Three C/C++ programmers walk into a bar. Simultaneously, they’re all right, but they’re also all wrong (and need a lesson about portable C code). One of the first few programs a programmer might write after hello world is something like this: 1. When they run that program, they see: 1. What the hell is going on?

C++ 59

C++ Programming Code Hardware 59

Nick Desaulniers

APRIL 18, 2014

At the lowest level, all computers are programmed with strings of ones and zeroes. When you program in machine language, you are controlling the computer at its brainstem, the root of its existence. So a whole Babel of computer languages has been created for programmers: FORTRAN, BASIC, COBOL, LISP, Pascal, C, PROLOG, FORTH.

C++ 98

C++ Programming Code Virtualization 98

HammerDB

FEBRUARY 25, 2021

On high-performance multi-core systems all the supported databases can return performance in the many millions of transactions per minute. This is why the choice of programming language is so important from the outset. To benchmark a database we introduce the concept of a Virtual User. Basic Benchmarking Concepts.

Programming 67

Programming Benchmarking Virtualization C++ 67

Brendan Gregg

OCTOBER 7, 2018

Created by Alastair Robertson , bpftrace is an open source high-level tracing front-end that lets you analyze systems in custom ways. more capable, and built from the ground up for the modern era of the eBPF virtual machine. eBPF (extended Berkeley Packet Filter) is in the Linux kernel and is the new hotness in systems engineering.

C++ 40

C++ Virtualization Programming Latency 40

Nick Desaulniers

MAY 25, 2015

Interpreters and compilers are interesting programs, themselves used to run or translate other programs, respectively. Those other programs that might be interpreted might be languages like JavaScript, Ruby, Python, PHP, and Perl. The other programs that might be compiled are C, C++, and to some extent Java and C#.

C++ 73

C++ Programming Code Architecture 73

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. The Actor Model’s most popular incarnation is probably in the programming language Erlang.

Games 145

Games Architecture Code C++ 145

HammerDB

JUNE 27, 2022

HammerDB has graphical and command line interfaces for the Windows and Linux operating systems. An important concept was to simulate database users called Virtual Users in parallel (rather than concurrently) to accurately simulate a real database workload with multiple users running from separate systems. Adoption by the TPC.

Benchmarking 62

Benchmarking Open Source C++ Cache 62

Brendan Gregg

SEPTEMBER 25, 2021

CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. Was there some other program consuming CPU, like a misbehaving Ubuntu service that wasn't in CentOS? Note that Ubuntu also has a frame to show entry into vDSO (virtual dynamic shared object). Microbenchmark os::javaTimeMillis() on both systems.

Speed 126

Speed Java AWS Virtualization 126

O'Reilly

FEBRUARY 18, 2020

It’s the single most popular programming language on O’Reilly, and it accounts for 10% of all usage. In programming, Python is preeminent. Normalized search frequency of top programming languages on the O’Reilly online learning platform in 2019 (left) and the rate of change for each language (right). Figure 3 (above).

Software Architecture 134

Software Architecture DevOps Data Engineering Architecture 134

Dynatrace

APRIL 5, 2021

Similar to AWS Lambda , Azure Functions is a serverless compute service by Microsoft that can run code in response to predetermined events or conditions (triggers), such as an order arriving on an IoT system, or a specific queue receiving a new message. Consider using virtual machines or specialized frameworks for these types of tasks.

Azure 137

Azure Serverless IoT Lambda 137

The Agile Manager

FEBRUARY 29, 2016

A few short years ago we were content to have an automated build execute every few minutes; today we want every check-in to trigger a build that is promoted through progressively more complex tests in virtual environments managed, instantiated and torn down by scripts. The landscape has changed.

Government 40

Government Games C++ Virtualization 40

Tech News Gather

NOVEMBER 22, 2022

The application world began to move forward after Google announced Kotlin as the new programming language for Android Apps at the 2017 I/O conference. Because Google intends to change the platform to Kotlin, many programmers have chosen Kotlin for Android app development and programming. It runs on the Java Virtual Machine.

Development 52

Development Java Programming Google 52

HammerDB

NOVEMBER 30, 2018

Programming Languages. When you download the source code for HammerDB you can see that the programming language it is written in is called TCL. TCL was designed as a language to be closely tied with C/C++ and at this lower level there is the compiled TCL (tclsh) or TCL/TK (wish) interpreter and supporting libraries.

Architecture 40

Architecture Virtualization Open Source C++ 40

High Scalability

JULY 26, 2018

Peter : DARPA foresee a third one in which context-based programs are able to explain and justify their own reasoning. That means every employee, contractor, and the thousands of agents who work at the company show up to work—team meetings, training seminars, onboarding sessions—all inside a virtual reality campus.

Internet 124

Internet Internet Scalability Serverless 124

O'Reilly

NOVEMBER 21, 2019

In a classic 1983 paper , cognitive psychologist Lisanne Bainbridge drew attention to a curious irony: so-called “automated” systems were, in practice, usually attended by one or more human operators. The more advanced the system, she observed, “the more crucial…the contribution of the human operator.”

Processing 83

Processing Programming Virtualization Technology 83

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

Enprowess

MAY 24, 2022

More incredible Speed with Virtual DOM. Reactjs can help your business in web and mobile application development by bringing fast speed using the virtual DOM. Virtual DOM of React refreshes only parts of the page, so it is faster than the conventional full refresh model. Key features of ReactJS. SoundCloud Pulse.

Mobile 52

Mobile Open Source Virtualization Speed 52

HammerDB

JULY 5, 2022

Python is a popular programming language, especially for beginners, and consequently we see it occurring in places where it just shouldn’t be used, such as database benchmarking. What programming languages does HammerDB use and why does it matter? Surely any language will do? usr/local/bin/tclsh8.6

Benchmarking 98

Benchmarking Database C++ Virtualization 98

The Morning Paper

DECEMBER 8, 2019

At the start of November I was privileged to attend HPTS (the High Performance Transaction Systems) conference in Asilomar. On the last morning of the conference Daniel Bittman presented some of the work being done in the context of the Twizzler OS project to explore new programming models for NVM. The Twizzler programming model.

Hardware 56

Hardware Programming Media Storage 56

Brendan Gregg

SEPTEMBER 25, 2021

CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. Was there some other program consuming CPU, like a misbehaving Ubuntu service that wasn't in CentOS? Note that Ubuntu also has a frame to show entry into vDSO (virtual dynamic shared object). Microbenchmark os::javaTimeMillis() on both systems.

Speed 52

Speed Java AWS Virtualization 52

Nick Desaulniers

APRIL 6, 2020

“War stories” in programming are entertaining tales of truly evil bugs that kept you up at night. asm goto is a GNU C extension that allows for assembly code to transfer control flow to a limited, known set of labels in C code. Recent work. has given me much fulfilment and a long list of truly awful bugs to recount.

C++ 67

C++ Hardware Code Virtualization 67

Brendan Gregg

SEPTEMBER 25, 2021

CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. Was there some other program consuming CPU, like a misbehaving Ubuntu service that wasn't in CentOS? Note that Ubuntu also has a frame to show entry into vDSO (virtual dynamic shared object). Microbenchmark os::javaTimeMillis() on both systems.

Speed 40

Speed Java AWS Virtualization 40

Nick Desaulniers

NOVEMBER 20, 2016

clang -c x.c Now that we have our static library, we can statically link it to our program and see the resulting symbols. The -fpic option converts absolute addresses to relative addresses, which allows for different processes to load the library at different virtual addresses and share memory. y.c $ ar -rv libhello.a

C++ 48

C++ Programming Code Virtualization 48

The Morning Paper

APRIL 2, 2019

Root of trust (RoT) establishment on an untrusted system ensures that a system state comprises all and only content chosen by the user, and the user’s code begins execution in that state. The untrusted system (system to be verified) is connected to a trusted local verifier. known good state of a trustworthy program).

Software 40

Software Software Programming Hardware 40

Enprowess

SEPTEMBER 7, 2021

JavaScript is one of the most famous and loved programming languages nowadays. It is growing day by day and has kept its position for eight years in a row and belongs to the top ten most loved programming languages. It helps isolated bugs quickly and reduces system downtime. Faster virtual DOM. Use cases of Node.js

Open Source 52

Open Source Virtualization Programming Servers 52

ScaleOut Software

JULY 14, 2021

A security sensor in a key-card access system might indicate an unusual pattern of building entries for an employee who has given notice of resignation. It shows how real-time digital twins are distributed across multiple virtual servers organized into an in-memory computing cluster connected to Azure IoT Hub.

IoT 52

IoT Azure Analytics Serverless 52

Brendan Gregg

JANUARY 17, 2018

OSes usually show you virtual memory and resident memory, shown as the "VIRT" and "RES" columns in top. The tool also has a cumulative mode (-C), which resets the referenced flags once then takes continuous measurements. wss.pl -C `pgrep -n mysqld` 1. That's the working set size. Eg, once per second: #./wss.pl 102.36. [.].

Cache 71

Cache Latency C++ Programming 71

Smashing Magazine

JULY 8, 2021

This method of modularization allows for efficient program development and easy debugging and modification in our application. In his upcoming online workshop The TypeScript Masterclass , Stefan Baumgartner will dive into type systems and how to use them well when writing JavaScript. This is the virtual node of Vue.js.

Speed 133

Speed Processing Development Code 133

Sutter's Mill

JANUARY 15, 2013

With the help of friends Robert Seacord and David Svoboda of CERT in particular, I posted a note and link to their CERT post today because people have been misunderstanding the recent Java vulnerabilities, thinking they’re somehow really C or C++ vulnerabilities because Java is implemented in C and C++. by Herb Sutter.

Java 40

Java C++ Virtualization Operating System 40

Brendan Gregg

AUGUST 8, 2017

Linux load averages are "system load averages" that show the running thread (task) demand on the system as an average number of running plus waiting threads. This measures demand, which can be greater than what the system is currently processing. then your system is idle. - TABLE OF EXP(-T/C) FOR T = 5 SEC.

Latency 111

Latency Metrics C++ Systems 111

All Things Distributed

MAY 21, 2018

Which human activities can be taken over by machines or ML-based systems? In the first step we might reach this goal by combining the fastest mobility services through a digital platform; in the next, it might be a task fulfilled by Virtual Reality. How many of the jobs that we know today will even exist in the future?

Artificial Intelligence 76

Artificial Intelligence Technology Technology IoT 76