John McCalpin

FEBRUARY 17, 2025

Understanding sustained memory bandwidth in these systems starts with assuming 100% utilization and then reviewing the factors that get in the way (e.g., This requires a completely different approach to modeling the memory system — one based on Little’s Law from queueing theory.

Latency 71

Latency Hardware Cache Systems 71

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. The latest AWS hypervisor, Nitro, uses everything to provide a new hardware-assisted hypervisor that is easy to use and has near bare-metal performance. I'd expect between 0.1%

Virtualization 110

Virtualization AWS Hardware Storage 110

All Things Distributed

SEPTEMBER 20, 2013

Not everybody agreed that the "N-ary Storage Model" (NSM) was the best approach for all workloads but it stayed dominant until hardware constraints, especially on caches, forced the community to revisit some of the alternatives. The first practical modern implementation is probably C-Store by Stonebraker, et al.

Storage 72

Storage Hardware Cache C++ 72

SQL Performance

JANUARY 23, 2020

The queues component of our methodology comes from Performance Monitor counters, which provide a view of system performance from a resource standpoint.". However, some seem to have missed Davidson's point regarding the importance of resources and rely almost entirely on waits to present a picture of query performance and system health.

Tuning 115

Tuning Servers Monitoring Hardware 115

Brendan Gregg

MARCH 16, 2024

The problem is that this system has a default libc that has been compiled without frame pointers, so any stack walking stops at the libc layer, producing a partial stack that's missing the application frames. and we may have been flying close to the edge of hardware cache warmth, where adding a bit more instructions caused a big drop.

Java 137

Java Cache Google Hardware 137

Sutter's Mill

DECEMBER 29, 2011

Now welcome to the hardware jungle. From 1975 to 2005, our industry accomplished a phenomenal mission: In 30 years, we put a personal computer on every desk, in every home, and in every pocket. In 2005, however, mainstream computing hit a wall. The free lunch is over. Galaxy S II, Droid X2, iPhone 4S). There’s no going back.

Hardware 40

Hardware Games Operating System Software 40

John McCalpin

FEBRUARY 17, 2025

Understanding sustained memory bandwidth in these systems starts with assuming 100% utilization and then reviewing the factors that get in the way (e.g., This requires a completely different approach to modeling the memory system — one based on Little’s Law from queueing theory.

Latency 40

Latency Hardware Cache Systems 40