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

Nick Desaulniers

DECEMBER 31, 0001

2020 Apr 6 Off by Two 2019 May 12 f() vs f(void) in C vs C++ 2019 Jan 18 Finding Compiler Bugs With C-Reduce 2018 Oct 24 Booting a Custom Linux Kernel in QEMU and Debugging It With GDB 2018 Jun 2 Speeding Up Linux Kernel Builds With ccache 2017 Sep 5 GCC vs LLVM Q3 2017 Commit Rates and Active Developer Counts 2017 May 31 Running Clang-Tidy (..)

C++ 40

C++ Speed Development 40

Dynatrace

DECEMBER 14, 2021

Already in 2018, 82% of all travel bookings globally took place without human interaction. For some time, a travel company’s digital presence has been the primary way to attract and interact with customers. I tried a few times, then – as a last resort – I called the customer service number, but wait times were “longer than normal.”

Airlines 190

Airlines Social Media Entertainment Transportation 190

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. get ( recipient ) ; Here is the time required to convert 1 million 32-bit integers on my 4.2GHz 2018 iMac: DataInputStream. An integer could be serialized as four bytes in a stream of bytes.

Java 124

Java C++ Code Speed 124

Sutter's Mill

FEBRUARY 10, 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++. P0542: Support for contract based programming in C++” (WG21 paper, June 2018).

C++ 46

C++ Programming Code 46

Sutter's Mill

MARCH 8, 2021

v.empty() )]] ; template <typename T> void f( not_empty<vector<T>> const& v ); // (c) A pointer that is not null void f( int* p ) [[pre( p != Contracts, preconditions and invariants” ( Andrzej’s C++ blog , December 2020). [2] Explain your answer. Notes [1] A. Krzemieński. Dos Reis, J. Meredith, N.

C++ 44

C++ Programming 44

Sutter's Mill

JANUARY 27, 2021

Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for postconditions. [1] Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for postconditions. [1] P0542: Support for contract based programming in C++” (WG21 paper, June 2018).

C++ 40

C++ Programming 40

Sutter's Mill

JANUARY 11, 2021

C++20 supports two main assertion facilities… For each one, briefly summarize how it works, when it is evaluated, and whether it is possible for the programmer to specify a message to be displayed if the assertion fails. C++ Coding Standards (Addison-Wesley, 2004). spdlog: Fast C++ logging library (GitHub). [7] Alexandrescu.

C++ 58

C++ Programming Code Testing 58

The Netflix TechBlog

APRIL 17, 2019

In 2018, AOM has published a specification for the AV1 video codec. In August 2018, Netflix’s Video Algorithms team and Intel’s Visual Cloud team decided to join forces on SVT-AV1 development. However, rav1e is written in Rust programming language, whereas an encoder written in C has a much broader base of potential developers.

Open Source 166

Open Source Scalability Speed Efficiency 166

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. The Benefits of TLS 1.3 via a browser.

Transportation 67

Transportation C++ Network Google 67

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

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.

Design 107

Design Development Programming Website 107

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

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 100.00 ^C I'm looking at the r_await column in particular: the average wait time for reads in milliseconds. . ## 2. 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

Percona

DECEMBER 5, 2022

Your MySQL connection id is 1 Server version: 5.5.30 (ProxySQL Admin Module) Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Type 'c' to clear the current input statement. [root@yunus-shaikh-node3 ~]# systemctl restart proxysql [root@yunus-shaikh-node3 ~]# mysql -h 127.0.0.1 -u Commands end with ; or g.

Servers 58

Servers Cache C++ Metrics 58

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 | |. . ### Source Here's the code to biolatency.bt: tools# cat -n biolatency.bt. Attaching 3 probes.

Latency 68

Latency C++ Cache Programming 68

Nick Desaulniers

OCTOBER 24, 2018

s -S & $ gdb vmlinux ( gdb ) target remote :1234 ( gdb ) hbreak start_kernel ( gdb ) c ( gdb ) lx-dmesg. It will seem that there’s no output, and QEMU isn’t responding to ctrl+c. Try ctrl+a , then c , to get a (qemu) prompt. Well at least we’re no longer in the dark (remember, ctrl+a , c , q to exit). enable-kvm.

C++ 56

C++ Hardware Virtualization Systems 56

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

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.

C++ 45

C++ Programming Cache Testing 45

CSS Wizardry

JULY 21, 2018

le|c|sa|sc)ss$/{print}' | nl. For a slightly more robust, but still imperfect method of identifying dead code, try this technique that I wrote up earlier in 2018. It’s often a good idea to see what files were changed last: any files that haven’t been altered in over a year are probably less important to current work.

Programming 142

Programming C++ Database Code 142

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. s" $( seq 1 $( date | wc -c ))). Ubuntu SMP.

Speed 46

Speed Cache C++ Systems 46

Sutter's Mill

MARCH 25, 2021

This is more obvious when the precondition involves multiple parameters (or ordinary variables for that matter); a poster child is the STL’s pervasive use of iterator pairs, which have long been crying out to be encapsulated using a range abstraction, and fortunately we now have that in C++20. Consider using a class instead. is_reachable?

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. Tools like CHESS and PCT [[link] are used to expose shared-memory concurrency bugs.

Cloud 81

Cloud Azure Cache C++ 81

Percona

MAY 1, 2023

This blog was originally published in August 2018 and was updated in May 2023. Out of the box, the default PostgreSQL configuration is not tuned for any particular workload. Default values are set to ensure that PostgreSQL runs everywhere, with the least resources it can consume, and so that it doesn’t cause any vulnerabilities.

Tuning 52

Tuning Efficiency Database Performance 52

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

Rigor

FEBRUARY 8, 2018

Our Customers Have an Advocate at the C-Level. He’s even been named a Customer Success Leader to watch in 2018! This is one of the reasons that our product is easy-to-use and our pricing is clear–because we know that it’s important to put the customers first, even in the little things. We win when our customers win.

C++ 40

C++ Network Monitoring Engineering 40

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. One of my favorite developments of 2018 in the AWS team has been the growth of their “Serverless Applications” efforts?—?what

Lambda 40

Lambda Serverless AWS Blockchain 40

The Morning Paper

DECEMBER 1, 2019

Plus ça change, plus c’est la même chose. 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.

Efficiency 60

Efficiency Cache C++ Performance 60

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. HammerDB-3.1$./hammerdbcli. hammerdbcli. HammerDB CLI v3.1. Type "help" for a list of commands. hammerdb>source innodbtest1.tcl.

Testing 48

Testing Tuning Latency Storage 48

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

ACM Sigarch

MARCH 18, 2019

In our second blog post , we will present the M/M/1 queue that confronts us with a stark, required trade-off among (a) allowing unscheduled task arrivals, (b) minimizing latency, and (c) maximizing throughput. About the Author: Mark D. Hill is John P. Morgridge Professor and Gene M.

Systems 60

Systems Latency Performance Analytics 60

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++ 140

C++ Servers Code Efficiency 140

Smashing Magazine

JUNE 30, 2021

While Workers are the “thread” primitive of the web, they are very different from the threads you might be used to from C++, Java & co. Paul Lewis and I once explored actor-centric app architecture at Chrome Dev Summit 2018. Once the state object is updated, it sends a copy of the updated state object to the DOM actor.

Games 145

Games Architecture Code C++ 145

The Morning Paper

OCTOBER 29, 2019

Today we’re taking a closer look at CORELS, the C ertifiably O ptimal R ul E L ist S algorithm that we encountered in Rudin’s arguments for interpretable models earlier this week. Learning certifiably optimal rule lists for categorical data Angelino et al., or ID3 so why do we need CORELS?

C++ 45

C++ Design Testing Code 45

J. Paul Reed

JANUARY 24, 2017

As I note in the TechBeacon article, as for what it means for DevOps, ask me in 2018. Google and Mozilla are trying to evolve the web as quickly as they can to “fix” this, but for now, sometimes, you still need to compile USB device drivers and package up and ship a bunch of native C/C++.) but rather that it i s a trend.

DevOps 40

DevOps Engineering IoT C++ 40

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++. Lance Gutteridge : The reason why almost no one encrypts their databases is one of the dirty secrets of IT. Only maintenance from now on, everything new will be in @rustlang. Peter J.

Internet 124

Internet Internet Scalability Serverless 124

SQL Performance

OCTOBER 13, 2021

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. orderdate , O. FROM Sales. 263 rows affected). 263 rows affected).

Cache 144

Cache Strategy C++ Code 144