ACM Sigarch

MARCH 18, 2019

Computer systems, from the Internet-of-Things devices to datacenters, are complex and optimizing them can enhance capability and save money. Developing simulators, however, is time-consuming and requires a great deal of infrastructure development regarding a prospective system. Answered in Part 2.). Lazowska, et al.

Systems 60

Systems Latency Performance Analytics 60

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. Here's key differences as of August 2018: Type DTrace bpftrace. Attaching 2 probes. ^C

C++ 40

C++ Virtualization Programming Latency 40

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. The M/M/1 queue also assumes that the arrival rate is not affected by the unbounded number of tasks in the queue (called an “open system”). Morgridge Professor and Gene M.

Systems 53

Systems Latency Performance C++ 53

Sutter's Mill

JANUARY 11, 2021

(Note that “no side effects on normal execution” is always automatically true for violation handlers even when an assertion system such as proposed in [4] allows arbitrary custom violation handlers to be installed, because those are executed only if we discover that we’re in a corrupted state and so are already outside of normal execution. [5]

C++ 58

C++ Programming Code Testing 58

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 avg-cpu: %user %nice %system %iowait %steal %idle 14.81 avg-cpu: %user %nice %system %iowait %steal %idle 14.86 avg-cpu: %user %nice %system %iowait %steal %idle 14.95 Hit Ctrl-C to end. ^C Hit Ctrl-C to end.

Cache 40

Cache C++ AWS Systems 40

Smashing Magazine

DECEMBER 2, 2021

C# Advent Calendar. It’s time for the fifth annual C# advent calendar that will feature two pieces of content every day. Anyone can contribute by sharing their blog posts, videos, articles or podcast episodes dedicated to C# development. Christmas Experiments (2018). Stoyan Stefanov on Twitter. SysAdvent on Twitter.

Design 107

Design Development Programming Website 107

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

C++ 42

C++ AWS Open Source Testing 42

Nick Desaulniers

OCTOBER 24, 2018

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. qemu-system-x86_64 -kernel arch/x86_64/boot/bzImage -nographic. It will seem that there’s no output, and QEMU isn’t responding to ctrl+c.

C++ 56

C++ Hardware Virtualization Systems 56

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 | |. system(".") 6 * 7 * Copyright 2018 Netflix, Inc. Hit Ctrl-C to end. ^C

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

MAY 1, 2023

This blog was originally published in August 2018 and was updated in May 2023. It is primarily the responsibility of the database administrator or developer to tune PostgreSQL according to their system’s workload. Out of the box, the default PostgreSQL configuration is not tuned for any particular workload.

Tuning 52

Tuning Efficiency Database Performance 52

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++.

C++ 49

C++ Code Testing Systems 49

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. make -j4 2008.93s user 231.69s system 346% cpu 10:47.07

Speed 46

Speed Cache C++ Systems 46

Sutter's Mill

MARCH 25, 2021

But if the sight of these function signatures has had you pulling your hair and shouting “use the type system, Luke!” c) just using post-C++20 contract preconditions (not yet valid C++, but something like the syntax in [2]) Preconditions test values, so they can let us eliminate the “wrong values” kinds of mistakes.

C++ 45

C++ Design Code Systems 45

The Morning Paper

JUNE 20, 2019

In total, there were 112 such incidents over the period March – September 2018 (not all of them affecting external customers). Most Azure code is written in.Net managed languages such as C#, reducing memory leak bugs. I’d expect this class of bugs to also surface in microservices systems. Does that match your experience?

Cloud 81

Cloud Azure Cache C++ 81

Sutter's Mill

JANUARY 25, 2021

In the post-C++20 contracts proposal at [3], this is partly captured by the proposed basic levels of default , audit , and axiom , roughly intended to represent “cheap,” “expensive,” and “impossible” respectively. P0542: Support for contract based programming in C++” (WG21 paper, June 2018). Dos Reis, J. Meredith, N. Stroustrup.

C++ 45

C++ Programming Cache Testing 45

The Symphonia

DECEMBER 7, 2018

Serverless, and related announcements, at re:Invent 2018 The fountains at the Bellagio?—?still Ruby, C++, and Rust are now Lambda languages directly supported by AWS. artifacts that can be merged into your function’s file system before the function is executed. Closing out And that’s your re:Invent wrap-up for 2018.

Lambda 40

Lambda Serverless AWS Blockchain 40

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. So to test I took a system with Skylake CPUs and all storage on a P4800X SSD. Copyright (C) 2003-2018 Steve Shaw. The OS was: Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-23-generic

Testing 48

Testing Tuning Latency Storage 48

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. Paul Lewis and I once explored actor-centric app architecture at Chrome Dev Summit 2018.

Games 145

Games Architecture Code C++ 145

O'Reilly

FEBRUARY 18, 2020

Growth is still strong for such a large topic, but usage slowed in 2018 (+13%) and cooled significantly in 2019, growing by just 7%. But sustained interest in cloud migrations—usage was up almost 10% in 2019, on top of 30% in 2018—gets at another important emerging trend. ML + AI are up, but passions have cooled. Security is surging.

Software Architecture 134

Software Architecture DevOps Data Engineering Architecture 134

High Scalability

JULY 26, 2018

@AndreaPessino : It's finally happening - after >30 years of pro use, 20 of which quite reluctantly, I am officially DONE with C/C++. THANKS Rust team for refining modern concepts into such a practical, elegant system. Only maintenance from now on, everything new will be in @rustlang.

Internet 124

Internet Internet Scalability Serverless 124

Smashing Magazine

NOVEMBER 23, 2021

John C Barstow. On design systems, CSS/JS and UX. It follows best practices, tries to present a strong visual identity, has good contrast levels, and uses Overpass for headings and body, which provides a unified and legible sans serif family of typefaces: See the Pen [Dyslexia-unfriendly design]([link] by John C Barstow.

Website 131

Website C++ Best Practices Design 131

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

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. Many people use postgres. CPU Configuration. Although 9.6.5

Best Practices 40

Best Practices Scalability Performance Hardware 40

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. SQL> alter system flush buffer_cache; System altered.

Benchmarking 40

Benchmarking Database C++ Virtualization 40

HammerDB

NOVEMBER 30, 2018

It is of note that we have not discussed the operating system yet, that is because the source code and the code included with the pre-packaged versions is identical whether it is running on Linux or Windows on x86-64 architecture (or any other platform). These bin and lib directories are not included with the source code. HammerDB CLI v3.1

Architecture 40

Architecture Virtualization Open Source C++ 40

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

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

Smashing Magazine

OCTOBER 26, 2018

2018-10-26T13:45:46+02:00. 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. WordPress core developers used a system of hooks which allowed other developers to modify or extend certain functionalities.

Cache 78

Cache Website Speed Database 78

Randon ASCII

FEBRUARY 25, 2018

See the end of the post for an October 2018 bug fix update, or read the whole story: Flaky failures are the worst. The next step was a custom C++ program that opened the just-linked exe and called FlushFileBuffers on it. Update, October 2018. I also just heard that Windows 10 RS5 (1809, the fall 2018 update) has a fix.

Programming 79

Programming Hardware Cache Code 79

Tech News Gather

MAY 3, 2023

A single set of codes can serve both systems. 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.

Mobile 40

Mobile Development Open Source Energy 40

High Scalability

SEPTEMBER 28, 2018

Never inflict a distributed system on yourself unless you have too." MrTonyD : I was writing production code over 30 years ago (C, OS, database). seconds with the system. Hey, it's HighScalability time: @danielbryantuk : "A LAMP stack is a good thing. mipsytipsy #CloudNativeLondon. Do you like this sort of Stuff?

Internet 35

Internet Internet Scalability Blockchain 35

Brendan Gregg

FEBRUARY 9, 2018

Also microbenchmarks, which often stress-test the system, will suffer the largest losses. This shows the system-wide syscall rate. I collected CPU profile as a [CPU flame graph] for both systems, but, for a change, they was boring: extra cycles were just in the syscall code, as one would expect reading the [KPTI changes].

Performance 75

Performance Benchmarking Cache Tuning 75

All Things Distributed

MAY 21, 2018

Which human activities can be taken over by machines or ML-based systems? Until now, access to digital technologies was limited above all by a machine's abilities: The interfaces to our systems are no longer machine-driven; in the future humans will be the starting point. Which tasks will be left over for humans to do?

Artificial Intelligence 77

Artificial Intelligence Technology Technology IoT 77

The Netflix TechBlog

JULY 1, 2019

In a previous post , we described how our TV application consists of a C++ SDK installed natively on the device, an updatable JavaScript user interface (UI) layer, and a custom rendering layer known as Gibbon. when we rolled them out globally at the end of 2018. both the full and fallback experiences?—?when

Cache 166

Cache Design Testing Development 166

Brendan Gregg

FEBRUARY 8, 2018

Also microbenchmarks, which often stress-test the system, will suffer the largest losses. This shows the system-wide syscall rate. I collected CPU profile as a [CPU flame graph] for both systems, but, for a change, they was boring: extra cycles were just in the syscall code, as one would expect reading the [KPTI changes].

Performance 40

Performance Benchmarking Cache Tuning 40

O'Reilly

MAY 19, 2020

Technical leads and architects (about 11%) are next, followed by software and systems architects (9+%). However, a notable minority—some 15%—occupy C-level or executive roles. In our analysis of user activity on the O’Reilly learning platform , we found that DevOps-related search and usage declined in both 2018 and 2019.

Cloud 141

Cloud Serverless AWS Architecture 141