Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts. There is already documentation as man pages and example files in the bcc and bpftrace repositories that you can link to, to help your customers understand the tool output. E.g., here's the execsnoop(8) example files in bcc and bpftrace. opensnoop Files opened table.

Latency 145

Latency Cache Energy Systems 145

HammerDB

APRIL 19, 2023

For example, if you are buying the latest Amazon memory-optimized EC2 instance (R7iz), the AWS page ( [link] ) tells us the following: Up to 3.9 This all sounded very similar to HammerDB TPROC-C workload (we will look at HammerDB TPROC-H (OLAP) another time), so it is easy for any reader to think both workloads are about the same.

Performance 54

Performance Benchmarking Cache Storage 54

Brendan Gregg

AUGUST 18, 2019

It was created by Alastair Robertson, a talented UK-based developer who has previously won various coding competitions. For example, iostat(1), or a monitoring agent, may tell you your average disk latency, but not the distribution of this latency. This example instrumented one of many thousands of available events. biolatency.bt

Latency 68

Latency C++ Cache Programming 68

Sutter's Mill

JANUARY 25, 2021

Not only is the integer comparison operation cheap, but min and max are already being accessed by this function and so they’re already “hot” in registers or cache. One commonly cited example is is_sorted. Given some assertion facility that can be used like this: MyAssert( condition ); // expresses that ‘condition’ must be true 1.

C++ 45

C++ Programming Cache Testing 45

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. How long your piece of JavaScript takes to finish depends on how fast the device is that your code is running on.

Games 145

Games Architecture Code C++ 145

The Morning Paper

JUNE 20, 2019

For example, we observed only a small number of configuration bugs caused by mis-specification of configuration entries in configuration files, even though such bugs were reported to be common in other settings. Most Azure code is written in.Net managed languages such as C#, reducing memory leak bugs. Bug resolution.

Cloud 81

Cloud Azure Cache C++ 81

Smashing Magazine

JUNE 18, 2020

Flutter isn’t that, though: it runs natively on each platform, and it means each app runs just like it would run if it were written in Java/Kotlin or Objective-C/Swift on Android and iOS, pretty much. Example 1: Storage. Running Different Code On Different Platforms. The Lack Of Secure Storage On the Web.

Storage 93

Storage Mobile Website Java 93

Percona

JUNE 4, 2023

The worklogs are where the design for future releases happens, and these are opened up when their features are fully developed and source-code-pushed. From a source code standpoint, MySQL makes pushes to Github when a release is made, whereas open source development happens for Percona Server for MySQL and MariaDB Server on Github.

Open Source 52

Open Source Servers Storage Scalability 52

The Netflix TechBlog

NOVEMBER 9, 2022

We also see much higher L1 cache activity combined with 4x higher count of MACHINE_CLEARS. a usage pattern occurring when 2 cores reading from / writing to unrelated variables that happen to share the same L1 cache line. Cache line is a concept similar to memory page?—? Thread 0’s cache in this example.

Hardware 363

Hardware Cache Performance Latency 363

Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts 7. There is already documentation as man pages and example files in the bcc and bpftrace repositories that you can link to, to help your customers understand the tool output. E.g., here's the execsnoop(8) example files in bcc and bpftrace. You can code it and it'll work forever.

Open Source 40

Open Source Latency Cache Energy 40

SQL Performance

OCTOBER 13, 2021

I also compare them with stored procedures, mainly focusing on differences in terms of default optimization strategy, and plan caching and reuse behavior. In my examples I’ll use a sample database called TSQLV5. An Example. GetTopCustOrders ( 1 , 3 ) ; I’ll refer to this example as Query 1. iTVFs vs.

Cache 144

Cache Strategy C++ Code 144

SQL Performance

SEPTEMBER 21, 2022

One example is using a bitwise representation of a set of user/role permissions. Another example is using a bitwise representation of a set of settings turned on or off in a given environment. For example, the ARITHABORT session option is represented by bit offset 6 in the bitmap returned by the @@options function.

Servers 122

Servers C++ Code Cache 122

Smashing Magazine

JULY 18, 2022

There was something he wanted to C."; If anything makes the JavaScript code fail, the paid user won’t have their dose of fun and might get angry. The “stale-while-revalidate” cache control strategy can reduce the TTFB issue by serving a cached version of the page until it’s updated. It works, but is it the best approach?

Cache 115

Cache Website Energy Servers 115

Percona

APRIL 3, 2023

In this blog, we will upgrade PG10, which has tables with OID columns and some extensions to PG13, as an example, using the native pg_upgrade utility. oid_test" SET WITHOUT OIDS; ALTER TABLE postgres=# c abs_test You are now connected to database "abs_test" as user "postgres". craft" SET WITHOUT OIDS; ALTER TABLE "public"."ports"

C++ 101

C++ Database Cache Storage 101

Smashing Magazine

MAY 25, 2022

The output of the code above would be the following: WeakMap {{…} => 'done'} man = null; console.log(human). The object is retained in memory and can be accessed with the following code: console.log(human[0]). let human = new WeakMap(): // Create an object, and assign it to a variable called man. It keeps the object in memory.

Cache 117

Cache Programming Storage Code 117

HammerDB

JUNE 27, 2022

HammerDB is Free software and consequently engineers should consider not only how they can benefit from using the software but also how they can contribute to the community with code and documentation. In addition to the TPC-C specification for OLTP workloads, the TPC has also developed the TPC-E specification. The NOPM Metric.

Benchmarking 62

Benchmarking Open Source C++ Cache 62

ACM Sigarch

OCTOBER 12, 2020

These, let’s call them metal languages , include FORTRAN (introduced in 1957), C (1972), and C++ (1985). Programmers continue to write applications in them, and they continue to evolve: the just approved C++20 standard is the latest example. Despite their age, these languages are far from dead! As Leiserson et al.

C++ 108

C++ Benchmarking Hardware Architecture 108

SQL Performance

APRIL 20, 2021

Additional parallel workers will be started to run the additional parallel tasks contained in branches B, C, and D. Our example query is running at DOP 2, so branch B will get two additional tasks. The same goes for branch C and branch D, giving a total of six additional tasks. Branch C (additional). Two additional tasks.

C++ 98

C++ Processing Servers Cache 98

Particular Software

MAY 8, 2023

When code breaks, our first move is carefully inspecting the call stack. For example, in a highly observable system, we can easily infer the internal state and behavior of the system without going back into the code to make changes when something unexpected occurs. Start order process| C[Order saga] C --> |3.

Systems 52

Systems C++ Azure Metrics 52

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. Our UI runs on top of a custom rendering engine which uses what we call a “surface cache” to optimize our use of graphics memory.

Cache 166

Cache Design Testing Development 166

Smashing Magazine

JULY 8, 2021

Using the proposed file structure is not a bad way of structuring your project per se, but as your project grows, you will need a better structure as your code becomes clustered and harder to navigate and access files. Examples of directives are v-if , v-model , v-for , etc. code some certain instructions that are peculiar to Vue.js.

Speed 133

Speed Processing Development Code 133

SQL Server According to Bob

DECEMBER 18, 2018

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]. Device level flushing may have an impact on your I/O caching, read ahead or other behaviors of the storage system. Patrick and Purvi doing performance and regression analytics.

Servers 90

Servers Media Cache Storage 90

HammerDB

JULY 5, 2022

So instead we are going to take a cut down version of the HammerDB TPROC-C driver script and do the same in Python and use the HammerDB infrastructure to measure performance. For this example, we are going to use PostgreSQL stored procedures in PostgreSQL 14.1. So firstly we have the Tcl based driver script called pgtest_thread.tcl.

Benchmarking 98

Benchmarking Database C++ Virtualization 98

SQL Performance

SEPTEMBER 25, 2019

An example plan shape showing a lazy table performance spool is below: The questions I set out to answer in this article are why, how, and when the query optimizer introduces each type of performance spool. The general idea is to cache and replay results, saving repeated executions of inner-side operators wherever possible.

Performance 104

Performance Cache Servers Education 104

Smashing Magazine

JULY 6, 2021

For example, if the CMS is built on Microsoft’s.NET Framework, the front-end website would also be built on the same technology. All functionality and integrations would also have a tight dependency which in turn results in a large, cumbersome monolithic code base. Comprehensive documentation and code samples are also a must.

Cache 143

Cache Website Mobile Google 143

Enprowess

MAY 24, 2022

It allows developers to create complex UIs from a small and isolated code called “components” ReactJS comprises two parts: the pieces containing HTML code, components, and an HTML document – where all your components will render. Platform-specific code. Power boost to Search Engine Optimization (SEO).

Mobile 52

Mobile Open Source Virtualization Speed 52

IO River

NOVEMBER 2, 2023

For example, consider the following scenario :‍Figure: A Vendor Lock-in Architecture‍You've used Amazon S3 to host your static site and content and Amazon API Gateway to host your APIs that clients will use to decide on the static content to fetch. Akamai tried to convince many users to use this new framework.

Lambda 52

Lambda AWS Cache Website 52

Brendan Gregg

FEBRUARY 9, 2018

This overhead can be reduced by A) pcid, fully available in Linux 4.14, and B) Huge pages. - **Cache access pattern**: the overheads are exacerbated by certain access patterns that switch from caching well to caching a little less well. For example, using my [perf-tools]: sudo./perf-tools/bin/funccount

Performance 75

Performance Benchmarking Cache Tuning 75

Smashing Magazine

OCTOBER 26, 2018

For example, simple presentational sites or sites that use WordPress as a backend are the main candidates for the decoupled approach. 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.

Cache 78

Cache Website Speed Database 78

Smashing Magazine

AUGUST 9, 2021

For example, while HTTP deals with URLs and data interpretation, Transport Layer Security (TLS) ensures security by encryption, TCP enables reliable data transport by retransmitting lost packets, and Internet Protocol (IP) routes packets from one endpoint to another across different devices in between (middleboxes).

Transportation 145

Transportation Internet Internet Network 145

IO River

NOVEMBER 2, 2023

CloudFront makes a simple choice here as it offers direct integration with all these services to let you cache responses across its global edge locations. Later on, your service might require security, and you might use AWS Web Application Firewall, which directly integrates with Amazon CloudFront to help secure your service. ‍

Lambda 52

Lambda AWS Cache Website 52

SQL Server According to Bob

MAY 19, 2019

As you can imagine, with a code base as large and vast as SQL Server, there is always room for improvement. For example, Azure SQL Database Edge can already use TSQL Predict Machine Learning (ML) and Column Storage. There are a bunch of folks with compiler, linker, SQL Server code, testing and other disciplines who provided input.

IoT 61

IoT Servers Development Cache 61

ScaleOut Software

JULY 27, 2018

Looking beyond distributed caching, it’s their ability to perform data-parallel analysis that gives IMDGs such exciting capabilities. This model works well for storing large, object-oriented collections of business-logic state, such as the examples listed above. That’s where performance problems can begin.

Scalability 40

Scalability Cache Airlines Healthcare 40

ScaleOut Software

JULY 27, 2018

Looking beyond distributed caching, it’s their ability to perform data-parallel analysis that gives IMDGs such exciting capabilities. This model works well for storing large, object-oriented collections of business-logic state, such as the examples listed above. That’s where performance problems can begin.

Scalability 40

Scalability Cache Airlines Healthcare 40

Smashing Magazine

JUNE 1, 2022

In many cases, they can be super convenient to add or remove without having to push code changes to the site. For example, users can install browser plugins to suggest coupon codes when they are shopping, to scan web pages for malware, to play games or message friends, or do any number of other things. More after jump!

Website 131

Website Design Network Best Practices 131

Randon ASCII

FEBRUARY 25, 2018

Now we have a problem statement that we can reason about: why are large chunks of our code segment filled with zeroes? This command compares the code bytes in the crash dump (some of them are saved in the crash dump, just in case) against those on disk. In this case it said that 9322 bytes in the code in the crash dump were wrong.

Programming 79

Programming Hardware Cache Code 79

Nick Desaulniers

NOVEMBER 20, 2016

Let’s say we wanted to reuse some of the code from our previous project in our next one. clang -c x.c While static libraries allowed us to reuse source code, static linkage does not allow us to reuse memory for executable code between different processes. This is the second post in a series on memory segmentation.

C++ 48

C++ Programming Code Virtualization 48