The Polyglot Developer

JANUARY 11, 2015

Up until mid December 2014, my personal profile website www.nraboy.com has been using PHP ZendFramework 2, and for whatever reason it would crash my Apache instance constantly. Since mid December 2014, I’ve made the switch to Express.js I have a few sites still running PHP and I didn’t want to pay for a new server strictly for Node.js

Servers 40

Servers Website Development 40

Dynatrace

JUNE 15, 2023

If your application runs on servers you manage, either on-premises or on a private cloud, you’re responsible for securing the application as well as the operating system, network infrastructure, and physical hardware. The financial services sector alone saw a surge in web application and API attacks of 257% from 2021 to 2022.

Cloud 181

Cloud Open Source Architecture Monitoring 181

SQL Server According to Bob

JUNE 22, 2016

Prior to SQL Server 2016 the trace flag –T8048 is used to upgrade (only) NUMA partitioned, CMemThread objects to CPU partitioned based objects. Keep in mind that the vast majority of CMemThread objects (SQL 2005, 2008, 2008 R2, 2012, 2014, Azure DB and 2016) are not partitioned. Trace flag –T8048 longer exists in SQL Server 2016.

Servers 40

Servers Azure Software Engineering Design 40

SQL Server According to Bob

JUNE 6, 2016

As indicated, SQL Server 2016 added the use of SSE and AVX instructions in various code paths to improve performance. This post will outline SQL Server’s decisions around SSE/AVX or software algorithm use. SQL Server asks the CPU if it supports SSE or AVX in order to determine the level of hardware support present on the system.

Servers 40

Servers Hardware Software Engineering Software 40

Dynatrace

APRIL 5, 2021

The 2014 launch of AWS Lambda marked a milestone in how organizations use cloud services to deliver their applications more efficiently, by running functions at the edge of the cloud without the cost and operational overhead of on-premises servers. Dynatrace news. What is AWS Lambda?

Lambda 183

Lambda AWS Serverless Hardware 183

SQL Performance

JULY 27, 2021

Continuing my series of articles on latches, this time I’m going to discuss the DBCC_OBJECT_METADATA latch and show how it can be a major bottleneck for consistency checks prior to SQL Server 2016 under certain circumstances. But remember, this bottleneck only happens for versions of SQL Server earlier than SQL Server 2016.

C++ 54

C++ Servers Database Code 54

Brendan Gregg

JULY 4, 2021

I summarized these topics and more as a plenary conference talk, including my own predictions (as a senior performance engineer) for the future of computing performance, with a focus on back-end servers.

Performance 52

Performance Latency Hardware Storage 52

Brendan Gregg

JULY 2, 2021

The architecture is: While the bpftrace binary is installed on all the target systems, the bpftrace tools (text files) live on a web server and are pushed out when needed. For a more recent example, I wrote cachestat(8) while on vacation in 2014 for use on the Netflix cloud, which was a mix of Linux 3.2 at the time.

Latency 145

Latency Cache Energy Systems 145

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory.

Performance 52

Performance Latency Cache Virtualization 52

SQL Performance

MAY 16, 2019

Without this guarantee, SQL Server might add index rows that are not sorted correctly, which would not be good. For INSERT.SELECT , SQL Server makes its own determination whether to ensure rows are presented to the Clustered Index Insert operator in key order or not. DMLRequestSort Conditions.

Cache 67

Cache Servers Testing Storage 67

High Scalability

JUNE 22, 2018

Charlie Demerjian : what does Intel have planned for their server roadmap? For the same reason the 14/10nm messaging is causing consternation among investors, but the server side is in much worse shape. Ultimately, Netflix did end up paying Comcast in 2014 and, surprise surprise, the throttling stopped. How bad is it?

Internet 113

Internet Internet Scalability Artificial Intelligence 113

SQL Performance

FEBRUARY 22, 2021

I would like to share a couple of recent examples that help illustrate how using deprecated SQL Server features continues to bite us. The system table sys.sysprocesses was replaced way back in SQL Server 2005 by a set of dynamic management views (DMVs), most notably sys.dm_exec_requests , sys.dm_exec_sessions , and sys.dm_exec_connections.

Latency 57

Latency Servers Monitoring Systems 57

MachMetrics

JUNE 16, 2020

Google made SSL use a ranking factor way back in 2014, and since Chrome 68, a “Not Secure” warning appears next to the URL of sites that aren’t using HTTPS. These are typically implemented automatically by the hosting company servers. The server can also preemptively send resources, reducing delays.

Speed 86

Speed Latency Google Website 86

Percona

JUNE 4, 2023

In this blog, we’ll provide a comparison between MariaDB vs. MySQL (including Percona Server for MySQL ). 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.

Open Source 52

Open Source Servers Storage Scalability 52

SQL Performance

MARCH 17, 2020

Back in 2014, I wrote an article called Performance Tuning the Whole Query Plan. This follow-up post revisits the question for SQL Server 2019, using a larger number of rows. It has 32GB RAM, with 24GB available to the SQL Server 2019 instance. Test Environment. The cost threshold for parallelism is set to 50.

Servers 86

Servers Tuning Database Efficiency 86

SQL Performance

JULY 1, 2019

The results are technically non-deterministic since SQL Server could validly return any one of the rows in each group. Nevertheless, if you run this query yourself, you are quite likely to see the same result I do: The execution plan depends on the version of SQL Server used, and does not depend on database compatibility level.

C++ 58

C++ Servers Database Performance 58

SQL Server According to Bob

JUNE 3, 2016

SQL Server 2016 changes the internal design to (CheckScanner), applying no lock semantics and a design similar to those used with In-Memory Optimized (Hekaton) objects, allowing DBCC operations to scale far better than previous releases. Ryan Stonecipher – Principle SQL Server Software Engineer. SQL Server. set nocount on.

Hardware 40

Hardware Cache Servers Software Engineering 40

SQL Server According to Bob

JULY 12, 2016

For SQL Server 2008, 2012 and 2014 the trace flag behavior remains the same. For SQL Server 2016 the trace flags are available but the behavior may be altered by the design changes. The SQL Server 2016 design change uses the CheckScanner instead of the MultiObjectScanner improving I/O behavior.

Servers 40

Servers Design Engineering Database 40

The Netflix TechBlog

APRIL 17, 2019

Netflix headquarters circa 2014. SVT-AV1 uses parallelization at several stages of the encoding process, which allows it to adapt to the number of available cores including newest servers with significant core count. It’s a nice building with good architecture!

Open Source 166

Open Source Scalability Speed Efficiency 166

The Polyglot Developer

JANUARY 29, 2015

Since starting this blog in July of 2014, I have had an unexpected amount of growth. So much, that a lot of strain has been placed on my virtual private server (VPS). This is because the server has run out of resources due to traffic spikes or other anomalies.

Monitoring 40

Monitoring Internet Internet Traffic 40

Tim Kadlec

SEPTEMBER 25, 2014

Macbook Air (2014). Macbook Air (2014). Macbook Air (2014). Macbook Air (2014). On powerful devices, like my Macbook Air (2014), parse and execution time was negligible. Render on the server If you’re using a client-side MVC framework, make sure you pre-render on the server. Firefox 31.

Latency 41

Latency Google Hardware Servers 41

Brendan Gregg

MARCH 16, 2024

2014: Java in Flames Broken Java Stacks (2014) When I joined Netflix in 2014, I found Java's lack of frame pointer support broke all application stacks (pictured in my 2014 Surge talk on the right). Back-end servers. I made that up, AFAIK they don't run Linux, but I may be wrong!)

Java 145

Java Cache Google Hardware 145

Tim Kadlec

DECEMBER 29, 2015

If your client-side MVC framework does not support server-side rendering, that is a bug. 2014 Favorites. This year, it was about Apple’s influence over the standardization process after some fallout around the Pointer Events specification. Client-side MVC’s Major Bug. Choosing Performance. Other years. 2013 Favorites.

Energy 40

Energy Google Servers Processing 40

SQL Performance

OCTOBER 29, 2019

There are multiple methods to look at poorly performing queries in SQL Server, notably Query Store, Extended Events, and dynamic management views (DMVs). ORDER BY ExecutionCount DESC ; Note: The sys.dm_exec_function_stats DMV was added in SQL Server 2016. Each option has pros and cons. query_hash AS [ query_hash ] , qs.

C++ 74

C++ Database Servers Tuning 74

Brendan Gregg

JULY 30, 2017

In late 2014 I was modifying the JDK to preserve the frame pointer so that traditional stack walkers and profilers would work (an example of the problem is here , where Java methods lack ancestry). If you're automating or implementing flame graphs, this is a small detail that may interest you. First, a confession.

Code 40

Code Java C++ Website 40

ACM Sigarch

MARCH 25, 2019

Figure 1 depicts a simple queue where tasks arrive, are optionally queued in the buffers to the left if the server is already busy, are then serviced one at a time in the circular server, and depart to the right. Amdahl Professor of Computer Sciences at the University of Wisconsin-Madison.

Systems 53

Systems Latency Performance C++ 53

Brendan Gregg

JULY 2, 2021

The architecture is: While the bpftrace binary is installed on all the target systems, the bpftrace tools (text files) live on a web server and are pushed out when needed. As an extreme example, I wrote cachestat(8) while on vacation in 2014 for use on the Netflix cloud, which was a mix of Linux 3.2 It depends on the tool. at the time.

Open Source 40

Open Source Latency Cache Energy 40

SQL Performance

FEBRUARY 1, 2022

This is done to make managing operations in the transaction log easier for the log manager in SQL Server. You can’t specify how many VLFs are created by SQL Server when the database is first created or the log file automatically grows, but you can influence it. So why does SQL Server pick 37 and not 1 for the first VLF sequence number?

Architecture 53

Architecture Servers Virtualization Database 53

Dynatrace

AUGUST 11, 2022

Cloud providers then manage physical hardware, virtual machines, and web server software management. The FaaS model of cloud computing debuted in 2014 with startups like hook.io. This code is then executed on remote servers in response to an event, such as users interacting with functional web elements.

Development 255

Development Serverless Best Practices Lambda 255

SQL Performance

JUNE 21, 2019

I've been teaching and writing about common SQL Server mistakes for many years. This article will expand on my previous article and point out how these apply to SQL Server , Azure SQL Database , and Azure SQL Managed Instance. SQL Server Agent alerts. This situation applies to on-premises SQL Server and IaaS. Statistics.

Servers 49

Servers Azure Hardware Database 49

SQL Performance

JULY 24, 2022

SQL Server 2012 went out of all forms of official support about two weeks ago, on July 12 th. Best approaches for running totals – updated for SQL Server 2012. In the very first post on this site, I compared the performance of long-standing running totals methods with the new windowing functions added in SQL Server 2012.

Servers 66

Servers Strategy Availability Processing 66

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. This server is spending about a third of its CPU cycles just checking the time! How long does it take to read the time?

Speed 126

Speed Java AWS Virtualization 126

Rigor

SEPTEMBER 11, 2019

Patrick is a London-based software developer who specializes in web performance and who describes himself as enjoying “working the entire stack, back-end to front-end, CDN to server.” The future of HTTP/2 server push. You can find him on Twitter @ patrickhamann or catch him on the speaker circuit. Billy Hoffman.

Performance 89

Performance Education Google Website 89

Dynatrace

SEPTEMBER 29, 2020

Since we moved to AWS in May 2014 we have had an availability of 99.95%! On one hand, they enable our engineers to get their latest enhancements deployed into production. On the other, they enable everyone at Dynatrace through self-service to do their part ensuring. Sydney, we have a disk write latency problem!

Infrastructure 182

Infrastructure Cloud Monitoring AWS 182

The Morning Paper

FEBRUARY 11, 2020

In a model for others to follow, the Caddy web server will automatically provision Let’s Encrypt certificates. Apache and Nginx remain the most popular Let’s Encrypt using web servers deployed in the wild though. In the beginnning. Initially, ISRG was funded almost entirely through large donations from technology companies.

Internet 119

Internet Internet Open Source Transportation 119

SQL Performance

AUGUST 23, 2019

In traditional row-mode execution plans, SQL Server may introduce a Bitmap operator as part of performing early semi join reduction before a parallel hash or merge join. There have been major improvements since the first appearance of the batch mode execution engine in SQL Server 2012. Background. The Query Optimizer. Bitmap Choice.

Servers 75

Servers Engineering Efficiency Retail 75

CSS Wizardry

MARCH 3, 2019

This includes CDNs, proxy servers, and the like. Once the 60 seconds is up, the browser will head back to the server to revalidate the file. It means ‘do no t serve a copy from cache until you’ve revalidated it with the server and the server said you can use the cached copy’. public and private. Cache-Control: no-cache.

Cache 264

Cache Latency Strategy Servers 264