John McCalpin

FEBRUARY 17, 2025

From the form of the equation the units are GB/s * ns = Bytes, but to understand how this maps to computer hardware resources it is almost always more convenient to translate this to units of “cache lines” (with 64 Bytes per cache line in the processors reviewed here). cache lines -> 5.6 cache lines -> 5.6

Latency 71

Latency Hardware Cache Systems 71

Daniel Lemire

FEBRUARY 8, 2019

The division by a power of two ( / (2 N )) can be implemented as a right shift if we are working with unsigned integers, which compiles to single instruction: that is possible because the underlying hardware uses a base 2. I make my benchmarking code available. What if d is a constant, but not known to the compiler? Can we do better?

C++ 279

C++ Benchmarking Hardware Testing 279

Brendan Gregg

NOVEMBER 29, 2017

Hardware virtualization for cloud computing has come a long way, improving performance using technologies such as VT-x, SR-IOV, VT-d, NVMe, and APICv. At Netflix, we've been using these technologies as they've been made available for instance types in the AWS EC2 cloud. I'd expect between 0.1% small (thanks @cperciva ). ## 3.

Virtualization 110

Virtualization AWS Hardware Storage 110

SQL Performance

JANUARY 23, 2020

Waits and Queues has been used as a SQL Server performance tuning methodology since Tom Davidson published the above article as well as the well-known SQL Server 2005 Waits and Queues whitepaper in 2006. Detailed query-level waits are available on demand via integrated Plan Explorer. Most Queries Don't Wait.

Tuning 115

Tuning Servers Monitoring Hardware 115

Brendan Gregg

MARCH 16, 2024

This technique saves two instructions in the prologue and epilogue and makes one additional general-purpose register (%rbp) available." 2005-2023: The winter of broken profilers However, the change was then applied to x86-64 (64-bit) as well, which had sixteen registers and didn't benefit so much from a seventeenth.

Java 137

Java Cache Google Hardware 137

The Agile Manager

MAY 31, 2022

Compare that to the relatively robust period of 2005 , when real interest rate curves were positive. Demand is outstripping supply, and that’s driving up the prices of what is available. Labor productivity improvement was so great compared to the hardware and software costs, interest rates had no discernible effect.

Hardware 52

Hardware Innovation Availability Software 52

John McCalpin

FEBRUARY 17, 2025

From the form of the equation the units are GB/s * ns = Bytes, but to understand how this maps to computer hardware resources it is almost always more convenient to translate this to units of “cache lines” (with 64 Bytes per cache line in the processors reviewed here). cache lines -> 5.6 cache lines -> 5.6

Latency 40

Latency Hardware Cache Systems 40