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Percentiles don’t work: Analyzing the distribution of response times for web services

Adrian Cockcroft

There is no way to model how much more traffic you can send to that system before it exceeds it’s SLA. This is unfortunate, because we’d really like to be able to build systems that have an SLA that we can share with the consumers of our interfaces, and be able to measure how well we are doing.

Lambda 98
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Nested Loops Joins and Performance Spools

SQL Performance

The general idea is to cache and replay results, saving repeated executions of inner-side operators wherever possible. When a spool is able to replay cached results, this is known as a rewind. You may find it helpful to think of a spool rebind as a cache miss, and a rewind as a cache hit. Lazy Table Spool.

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MariaDB vs MySQL: Key Differences and Use Cases

Percona

Before we dive into the differences between MariaDB and MySQL, we will provide a thorough examination of each relational database management system (RDBMS). While originally designed to be a drop-in replacement for MySQL, it evolved into its own distinct database management system and is now maintained and supported by the MariaDB Foundation.

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SQL Server On Linux: Forced Unit Access (Fua) Internals

SQL Server According to Bob

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
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Headless WordPress: The Ups And Downs Of Creating A Decoupled WordPress

Smashing Magazine

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. on December 6th, 2016.

Cache 78
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Compiler bug? Linker bug? Windows Kernel bug.

Randon ASCII

In September of 2016 we started noticing random failures when building Chrome – 3 out of 200 builds of Chrome failed when protoc.exe, one of the executables that is part of the build, crashed with an access violation. This was starting to look like a Windows file cache bug. failure rate. sync.exe after linking exes: 0% failure rate.

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Static and Dynamic Libraries

Nick Desaulniers

clang -c x.c If you run otool -L on libSystem itself, you’ll see it depends on a bunch of other libraries including a C runtime, malloc implementation, pthreads implementation, and more. 6 15828: search cache = /etc/ld.so.cache 15828: trying file = /lib/x86_64-linux-gnu/libc.so.6 bin # system installed binaries like nm, gcc. ???

C++ 48