Daniel Lemire

FEBRUARY 8, 2019

I believe that all optimizing C/C++ compilers know how to pull this trick and it is generally beneficial irrespective of the processor’s architecture. In concrete terms, here is the C code to compute the remainder of the division by some fixed divisor d : uint32_t d =. ; // your divisor > 0. if ( ( i % 3 ) = = 0 ).

C++ 279

C++ Benchmarking Hardware Testing 279

Dynatrace

AUGUST 14, 2023

A/B testing allows organizations to compare two versions of a web or app experience and then determine which one performs better. With the ability to zero in on relevant entry points and conversions, teams can steadily improve performance. The following are some of the most frequently used behavior analytics tools.

Analytics 231

Analytics Social Media Website IoT 231

Scalegrid

JULY 13, 2020

Comparison Overview. There are a wide range of tools and extensions for every conceivable scenario, like performance profiling, auditing, etc. Objective C. Let’s take a look at core functionality of these two relational database management systems. PostgreSQL. Scalability. Oracle Ease of Use. SolarisUnix. JavaScript.

Open Source 244

Open Source Tuning C++ Database 244

SQL Performance

MARCH 9, 2022

The tricky part about this solution is its performance degrades as the largest interval length increases. The CTE W then performs a full outer join between D and S, matching D.Running with S.Running, and returns the first non-NULL among D.Running and S.Running as W.Running. With the same 400K-row input, it took Joe’s solution 0.9

C++ 138

C++ Code Efficiency Performance 138

SQL Performance

AUGUST 1, 2022

One of the complexities that is of a specific importance to this section is comparisons that potentially involve NULL comparands, such as ones that you use in filter and join predicates. Most operators that you use in such comparisons, including the equals (=) and different than (<>) operators, use three-valued logic.

Servers 142

Servers Testing C++ Code 142

Brendan Gregg

NOVEMBER 4, 2020

Right now there are many BPF (eBPF) startups building networking, security, and performance products (and more in stealth), yet requiring customers to install LLVM, Clang, and kernel headers – which can consume over 100 Mbytes of storage – to use BPF is an adoption drag. It adds about 1.5 Ubuntu 20.10 Attaching 1 probe.

C++ 145

C++ Programming Storage Code 145

SQL Performance

NOVEMBER 11, 2020

I provided recommendations in terms of when it makes sense to use CTEs versus when it makes sense to use temporary objects from a query performance standpoint. WITH C AS ( SELECT SYSDATETIME ( ) AS dt ) SELECT @i += 1 FROM C WHERE dt = dt ; PRINT @i ; GO. -- Batch 3. FROM C AS C1 INNER JOIN C AS C2 ON C1.

C++ 122

C++ Code Storage Processing 122

SQL Performance

APRIL 13, 2022

Finally, I’ll compare the performance of the different solutions. To test the performance of your solution, you’ll need to populate the table with larger volumes of sample data. L0 AS ( SELECT 1 AS c. In some of those cases, forcing a serial plan with a hint resulted in option 3 above, and in better performance.

C++ 136

C++ Strategy Testing Servers 136

HammerDB

JULY 16, 2021

One of the most important concepts in analysing database performance is that of understanding scalability. When a system ‘scales’ it is able to deliver higher levels of performance proportional to the system resources available to it. reaches peak performance at 1006469 NOPM at 122 Virtual Users, with MySQL 5.7

Virtualization 57

Virtualization Performance C++ Database 57

SQL Performance

SEPTEMBER 5, 2019

This article explores the batch data normalized representation, explains why not all eight-byte data types can fit within 64 bits, and shows an example of how all this affects batch-mode performance. c = COUNT_BIG ( * ) FROM #T AS T WHERE 1 = ( SELECT 1 ) -- Avoid trivial plan. c1 = @Start + N. FROM #Numbers AS N ; GO.

Performance 81

Performance C++ Storage Servers 81

SQL Performance

DECEMBER 9, 2020

I’ll present the performance tests that I’ve done with my solution. What’s the best performing solution that you can conjure? To evaluate the performance of your solution and compare it with others, I’ll test it with the range 1 through 100,000,000, with Discard results after execution enabled in SSMS. So, the challenge is on!

C++ 114

C++ Servers Testing Processing 114

Smashing Magazine

AUGUST 9, 2019

Handling Unused CSS In SASS To Improve Performance. Handling Unused CSS In SASS To Improve Performance. c-button { // styles et al } // any other class declarations }. c-button { // styles et al } // any other class declarations }. c-button { // styles et al } // any other class declarations }. Luke Harrison.

Performance 94

Performance C++ Media Website 94

Smashing Magazine

JANUARY 11, 2021

Front-End Performance Checklist 2021. Front-End Performance Checklist 2021. This guide has been kindly supported by our friends at LogRocket , a service that combines frontend performance monitoring , session replay, and product analytics to help you build better customer experiences. Web performance is a tricky beast, isn’t it?

Performance 145

Performance Cache Media Metrics 145

HammerDB

JUNE 27, 2022

It enables the user to measure database performance and make comparative judgements about database hardware and software. The Transaction Processing Performance Council (TPC) was founded to bring standards to database benchmarking, and the history of the TPC can be found here. What is HammerDB? Why HammerDB was developed.

Benchmarking 62

Benchmarking Open Source C++ Cache 62

Scalegrid

JULY 29, 2020

In our final post, we will put them head-to-head in a detailed feature comparison and compare the results of PgBouncer vs. Pgpool-II performance for your PostgreSQL hosting ! Performance Testing. Forced pgbench to create a new connection for each transaction using the -C option. PostgreSQL Connection Pooling Series.

Benchmarking 246

Benchmarking Database Performance Testing Availability 246

Sutter's Mill

FEBRUARY 17, 2020

C++ “move” semantics are simple, and unchanged since C++11. Move: What it is, and how to use it In C++, copying or moving from an object a to an object b sets b to a ’s original value. This post is an attempt to shed light on that situation. That’s it for what advanced users need to know. Yes, but don’t.

C++ 98

C++ Testing Design Strategy 98

Alex Russell

MAY 9, 2022

Despite advances in browser tooling , automated evaluation , lab tools , guidance , and runtimes , however, teams struggle to deliver even decent performance with today's popular frameworks. What is Performance? It may seem a silly question, but what is performance, exactly?

Performance 86

Performance Latency Metrics Engineering 86

Sutter's Mill

JUNE 3, 2021

Briefly, what is the difference among: (a) undefined behavior Undefined behavior is what happens when your program tries to do something whose meaning is not defined at all in the C++ standard language or library (illegal code and/or data). You’ll get some valid result, but you won’t know what the result is until your code looks at it.

C++ 54

C++ Programming Lambda Code 54

SQL Performance

JULY 1, 2021

t2 ( id bigint IDENTITY PRIMARY KEY , msg ntext ) ; Now, let's try to perform online operations on the tables: ALTER TABLE dbo. An online operation cannot be performed for index 'PK__t2__3213E83FEEA1E0AD' because the index contains column 'msg' of data type text, ntext, image or FILESTREAM. name , [ Column ] = c.

C++ 58

C++ Database Servers Performance 58

SQL Performance

FEBRUARY 12, 2020

In Part 1 I covered the meaning of the NULL marker and how it behaves in comparisons. In Part 1 in the series I explained how NULLs behave in comparisons and the complexities around the three-valued predicate logic that SQL and T-SQL employ. Often in practice you want NULLs to behave just like non-NULL values for comparison purposes.

C++ 120

C++ Code Servers Database 120

Percona

JUNE 4, 2023

In this blog, we’ll provide a comparison between MariaDB vs. MySQL (including Percona Server for MySQL ). Advantages: MariaDB is a highly advantageous option for a wide range of applications and organizations, offering numerous benefits that set it apart from other RDBMS: A significant advantages of MariaDB is its performance.

Open Source 52

Open Source Servers Storage Scalability 52

SQL Performance

DECEMBER 11, 2019

I start with coverage of what NULLs are and how they behave in comparisons. Comparisons involving NULLs. I'll first cover comparisons involving constants. Later I'll cover comparisons involving variables, parameters and columns. This way you can avoid unnecessary bugs and pitfalls.

Best Practices 117

Best Practices C++ Database Code 117

HammerDB

DECEMBER 9, 2020

is the refactoring of the stored procedures for some of the TPROC-C workloads. This means that the performance metrics reported in NOPM/TPM could be different from previous releases as well as the ratio between NOPM and TPM for these workloads. Another key feature introduced with HammerDB v4.0 Therefore results from v4.0 NOPM vs TPM.

C++ 52

C++ Benchmarking Metrics Database 52

The Netflix TechBlog

APRIL 17, 2019

Scalable Video Technology (SVT) is Intel’s open source framework that provides high-performance software video encoding libraries for developers of visual cloud technologies. Reference software serves as the basis for standard development, a framework, in which the performance of video coding tools is evaluated.

Open Source 166

Open Source Scalability Speed Efficiency 166

SQL Performance

DECEMBER 9, 2020

I’ll present the performance tests that I’ve done with my solution. What’s the best performing solution that you can conjure? To evaluate the performance of your solution and compare it with others, I’ll test it with the range 1 through 100,000,000, with Discard results after execution enabled in SSMS. So, the challenge is on!

C++ 61

C++ Servers Testing Processing 61

Highly Scalable

JUNE 5, 2012

At GridDynamics, we recently worked on a custom database for realtime web analytics where fast intersection of very large lists of IDs was a must for good performance. However, it was interesting to evaluate performance of alternative approaches. Performance of this procedure both in C and Java will be evaluated in the last section.

C++ 102

C++ Java Performance Testing Efficiency 102

SQL Performance

MAY 8, 2019

GetNums ( 1 , 100 ) AS C WHERE C. GetNums ( 1 , 100 ) AS C WHERE C. But for customers 17 and 59, the IN predicate yields UNKNOWN since all comparisons with non-NULL values yield FALSE, and the comparison with the NULL yields UNKNOWN. CREATE TABLE dbo. Customers. ( ) ; INSERT INTO dbo.

Best Practices 68

Best Practices C++ Code Servers 68

SQL Performance

APRIL 14, 2021

It has excellent performance, and there’s quite a lot that you can learn from it. Evaluating earlier solutions, one of the important factors in getting good performance was the ability to employ batch processing. Here are the performance numbers that I got in my test: CPU time = 10032 ms, elapsed time = 10025 ms.

C++ 112

C++ Servers Testing Code 112

Enprowess

NOVEMBER 2, 2021

Quick Summary : A comparison of the two most widely used cross platform frameworks to build both iOS and Android mobile applications: React Native vs Flutter. Know the difference between Flutter vs React Native in terms of architecture, performance, community support, learning curve, use cases and many other aspects. Table of Contents.

Development 52

Development Social Media Mobile Code 52

The Morning Paper

MAY 16, 2019

For the remaining statements, you can use the data from this research to re-evaluate how strongly you want to hold those opinions… We perform the first systematic study on concurrency bugs in real Go programs. An especially interesting comparison can be made in the case of gRPC, which has both a C implementation and a Go implementation.

Programming 100

Programming C++ Design Code 100

Brendan Gregg

SEPTEMBER 25, 2021

These strange questions came to the fore back in 2014 when Netflix was switching services from CentOS Linux to Ubuntu, and I helped debug several weird performance issues including one I'll describe here. A quick check of basic performance statistics showed over 30% higher CPU consumption. How would you _time_ time? us on Ubuntu.

Speed 126

Speed Java AWS Virtualization 126

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.

Best Practices 40

Best Practices Scalability Performance C++ 40

Highly Scalable

SEPTEMBER 18, 2012

Historically, NoSQL paid a lot of attention to tradeoffs between consistency, fault-tolerance and performance to serve geographically distributed systems, low-latency or highly available applications. This schema provides good performance because individual updates are replaced by asynchronous batch processing.

Database 213

Database Latency C++ Scalability 213

HammerDB

OCTOBER 23, 2023

HammerDB has always used stored procedures as a design decision because the original benchmark was implemented as close as possible to the example workload in the TPC-C specification that uses stored procedures. Additionally, reviewing official TPC-C full disclosure reports highlighted that all vendors also use stored procedures.

Benchmarking 62

Benchmarking Database Network C++ 62

SQL Performance

AUGUST 2, 2019

OrderID , c. Customers c ON o. CustomerID = c. OrderID , c. OrderID , c. Customers c ON o. CustomerID = c. OrderID , c. OrderID , c. Customers c ON o. CustomerID c. OrderID , c. If we look at individual query performance: SELECT. [ OrderLines ol ON o.

Servers 95

Servers C++ Testing Systems 95

Percona

OCTOBER 3, 2018

Some time ago, a customer had a performance issue with an internal process. This is simple if you use a LEFT JOIN and an IS NULL comparison over the second table in the WHERE clause, but what if the column could be null? That is why he used UNION, GROUP BY and a HAVING clauses, which resulted in poor performance.

C++ 43

C++ Virtualization Performance Processing 43

SQL Performance

MAY 12, 2021

Early on when I posted the puzzle, several people commented that the best performing solution would likely be a CLR-based one. Before I cover the CLR-based solutions, let’s quickly review the performance of two of the best performing T-SQL solutions. In Part 1 , Part 2 , Part 3 and Part 4 I covered pure T-SQL solutions.

C++ 111

C++ Servers Database Code 111