Percona

JUNE 20, 2023

In order to understand “segmentation fault,” it is a must to know the basic idea of segmentation and its implementation in C programming. ” Basic understanding In order to understand segmentation fault, it is necessary to understand memory management methods for processes.

Programming 83

Programming C++ Database Virtualization 83

PDC

AUGUST 2, 2019

In previous posts we have introduced the multiprocessing module which makes it possible to parallelize Python programs on shared memory systems. on distributed memory systems). Now we can write our first Python program with mpi4py. print ( 'Hello from process {} out of {}'. which python3 /pdc/vol/anaconda/2019.03/py37/bin/python3.

Programming 64

Programming Code Processing Open Source 64

O'Reilly

AUGUST 9, 2022

GitHub Copilot (based on a model named Codex , which is derived from GPT-3) generates code in a number of programming languages, based on comments that the user writes. It’s easy to imagine a lot of software professionals saying, “Of course you’ll have to know C. In the 1950s, computers were programmed in machine language.

Programming 105

Programming Java C++ Design 105

Percona

OCTOBER 12, 2023

An example of a flame graph can be found below: Each box is a function in the stack, and wider boxes mean more time the system was busy on CPU on these functions. Kubernetes limitations In Linux, by default, performance system events can’t be collected by unprivileged users. ✔ Launching profiler. ✔ Profiling.

Code 109

Code Tuning C++ Benchmarking 109

Official Blog - World Web Technology

AUGUST 27, 2023

Similarly, using the best programming language for your website is also crucial. When it comes to programming languages, you will find many options, but PHP is the most viable option to choose. It is one of the most preferred programming languages used by developers across the globe for website development. What is PHP?

Development 98

Development Ecommerce Open Source Website 98

Percona

DECEMBER 29, 2022

While working as a DBA, we perform many regular tasks, and one of them is upgrading our database systems. The process using pg_upgrade is well documented , and you can easily find the instructions with little googling. Following the main process, I installed the same packages as the existing version 11 to version 12 and verified.

C++ 82

C++ Open Source Database Programming 82

Dynatrace

JULY 21, 2020

Business, finance, and administrative applications written in the common business-oriented language (COBOL) have run tirelessly on IBM Z systems since the early 1960s. COBOL applications must be processed on expensive general processors, while Java applications are eligible to run on IBM Z specialty processors such as zIIPs.

Java 180

Java Government Database Programming 180

Adrian Cockcroft

MAY 23, 2022

He’d programmed in the 1960s and encouraged me to learn. That got me a job at Cambridge Consultants Ltd as a software engineer writing code (mostly in C) for embedded real time signal processing and control systems. It had a 6809 CPU and ran an operating system called Flex9.

C++ 98

C++ Software Engineering Education Engineering 98

Dynatrace

APRIL 11, 2023

Log4Shell required many organizations to take devices and applications offline to prevent malicious attackers from gaining access to IT systems and sensitive data. The CVE Program, which publishes vulnerabilities as they become known, reported a 25% increase in vulnerabilities between 2021 and 2022.

Cloud 189

Cloud DevOps Open Source Retail 189

The Morning Paper

NOVEMBER 12, 2019

Scaling symbolic evaluation for automated verification of systems code with Serval Nelson et al., Serval is a framework for developing automated verifiers of systems software. Prior work has demonstrated symbolic evaluation for specific systems, but Serval introduces a general purpose approach of reusable and interoperable verifiers.

Code 45

Code Systems Programming Google 45

HammerDB

MARCH 25, 2023

Docker build, example CLI scripts were added to build and run the TPROC-C workload in the Tcl language. these were enhanced to also add Python based scripts, and to include scripts for both TPROC-C and TPROC-H and a driver script for Linux environments. With the HammerDB v4.5 In HammerDB v4.6 With HammerDB v4.7

C++ 83

C++ Virtualization Benchmarking Database 83

Testlodge

MARCH 15, 2023

White box testing is a software testing approach based on an analysis of the internal structure of the component or system. Internal structure may include code, architecture, integrations, and data flows of a system. White box testing also builds confidence in a system. Why is White Box Testing Performed?

Testing 83

Testing Testing Tools Java Programming 83

The Netflix TechBlog

JUNE 4, 2019

Traditionally it has been the responsibility of the operating system’s task scheduler to mitigate this performance isolation problem. Its goal is to assign running processes to time slices of the CPU in a “fair” way. We formulate the problem as a Mixed Integer Program (MIP). So why mess with it?

Cache 251

Cache Latency Airlines Logistics 251

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

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. eBPF (extended Berkeley Packet Filter) is in the Linux kernel and is the new hotness in systems engineering. Pages paged in by process bpftrace -e 'software:major-faults:1 { @[comm] = count(); }'.

C++ 110

C++ Virtualization Programming Latency 110

Testlodge

JULY 19, 2023

J-SOX and C-SOX are the Japanese and Canadian equivalents, respectively. Australia has initiated the Corporate Law Economic Reform Program Act (CLERP 9), and a United Kingdom version, UK SOx, is anticipated to roll out towards the end of 2023. IT Security – This control refers to the security of the systems and their data.

Testing 81

Testing Energy Programming Government 81

O'Reilly

APRIL 25, 2023

This post is a brief commentary on Martin Fowler’s post, An Example of LLM Prompting for Programming. There’s a lot of excitement about how the GPT models and their successors will change programming. This is understandable, but we need to be clear: if AI systems are going to write code, that code must be tested exhaustively. (If

Programming 131

Programming Architecture Strategy Code 131

Percona

JUNE 4, 2023

Introduction: MariaDB vs. MySQL The goal of this blog post is to evaluate, at a higher level, MariaDB vs. MySQL vs. Percona Server for MySQL side-by-side to better inform the decision making process. It is largely an unofficial response to published comments from the MariaDB Corporation. What is MariaDB?

Open Source 52

Open Source Servers Storage Scalability 52

O'Reilly

DECEMBER 12, 2023

But reading texts has been part of the human learning process as long as reading has existed; and, while we pay to buy books, we don’t pay to learn from them. The same process is used to generate output, and it’s important to understand why that process makes copyright problematic. Where did the word “or” come from?

Artificial Intelligence 101

Artificial Intelligence Media Google Processing 101

Brendan Gregg

JULY 2, 2021

This is also applicable for people adding it to their own in-house monitoring systems. E.g., to see process execution with timestamps using execsnoop(8): # execsnoop-bpfcc -T. You likely already have agents running on all your customer systems. Low frequency events such as process execution should be negligible to capture.

Latency 145

Latency Cache Energy Systems 145

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

Randon ASCII

MARCH 30, 2020

billion lines of source code to be processed. That is, the main source files represent just 0.32% of the lines of code being processed. It’s that header files that are included from multiple source files get processed multiple times, and this redundant processing is where the vast majority of C++ compilation time comes from.

C++ 87

C++ Code Open Source Programming 87

Tasktop

OCTOBER 28, 2020

Whatever your industry, structure, methodology, tooling or processes, the Flow Framework provides a clear blueprint for practicing VSM in software delivery. The Flow Partner Program: Unlocking the Vast Potential of Value Stream Management (VSM). A leading U.S healthcare leader doubling its feature velocity. Subscribe now.

Healthcare 90

Healthcare Innovation Government Best Practices 90

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

Brendan Gregg

DECEMBER 31, 2018

In summary: - Beginner: run [bcc] tools - Intermediate: develop [bpftrace] tools - Advanced: develop [bcc] tools, contribute to bcc & bpftrace Update: I have a new book about eBPF tracing, published by Addison Wesley: [BPF Performance Tools: Linux System and Application Observability]. Beginner ## 1. eBPF is part of the Linux kernel.

C++ 52

C++ Virtualization Programming Code 52

The Morning Paper

MAY 23, 2019

These techniques work well for scientific programs that are dominated by arrays. However, they are ineffective on object-based programs because objects do not fall neatly into fixed-size blocks and have a more irregular layout. If we compress objects instead of cache lines though, we can get to a 56% compression ratio (c).

Cache 61

Cache Benchmarking Hardware Java 61

Testsigma

JANUARY 18, 2021

Web Developers frequently come across issues where the developed website or web application does not work as expected on certain combinations of browsers and operating systems. Does this mean that enough effort was not spent in the automation testing process? The simple answer to this question is a “ Firm Yes ”!

Testing 55

Testing Operating System Website Internet 55

Tasktop

FEBRUARY 11, 2020

PMO roles—such as program and project managers—are expanding and evolving due to the reorientation of IT organizations toward value-based outcomes. To transition from scope based outcomes to value-based outcomes, it makes sense that the PMO transition to effectively help optimize business outcomes at a program level.

Programming 69

Programming C++ Engineering DevOps 69

Nick Desaulniers

OCTOBER 24, 2018

Typically, when we modify a program, we’d like to run it to verify our changes. qemu-system-x86_64. s -S & $ gdb vmlinux ( gdb ) target remote :1234 ( gdb ) hbreak start_kernel ( gdb ) c ( gdb ) lx-dmesg. qemu-system-x86_64 -kernel arch/x86_64/boot/bzImage. Try ctrl+a , then c , to get a (qemu) prompt.

C++ 56

C++ Hardware Virtualization Systems 56

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. eBPF (extended Berkeley Packet Filter) is in the Linux kernel and is the new hotness in systems engineering. Pages paged in by process bpftrace -e 'software:major-faults:1 { @[comm] = count(); }'.

C++ 40

C++ Virtualization Programming Latency 40

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

Tasktop

JUNE 17, 2021

Various efforts to optimize different stages of the process had only seen costs continue to rise. Only by focusing on the speed and predictability around end-to-end flow to the customer could they begin optimizing the whole process from request to delivery and back through the feedback loop.

Metrics 52

Metrics Speed Innovation Technology 52

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

O'Reilly

JANUARY 9, 2024

Python is an interpreted language, so there’s no machine code, but there’s no reason this loop couldn’t incorporate a C or C++ compiler. To people who programmed using circuit diagrams and switches, these early languages looked as radical as programming with generative AI looks today.

Programming 112

Programming C++ Code Operating System 112

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. For HammerDB both TPROC-C and TPROC-H run all of their workloads on the database being tested in SQL.

Programming 67

Programming Benchmarking Virtualization C++ 67

Nick Desaulniers

JANUARY 20, 2016

The bread and butter commands when working with gdb or lldb are: r (run the program). c (continue). q (quit the program). Let’s say I want to debug a program I can build, but is crashing or something: 1. Running the program until breakpoint hit: 1. s (step in). n (step over). finish (step out). clang sleep.c.

Programming 40

Programming C++ Processing Code 40

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