Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. This server is spending about a third of its CPU cycles just checking the time! In 2019 myself and others tested kvm-clock and found it was only about 20% slower than tsc. 30.14% in the middle of the flame graph.

Speed 126

Speed Java AWS Virtualization 126

The Morning Paper

NOVEMBER 8, 2020

The initial version of Delos went into production after eight months using a ZooKeeper-backed Loglet implementation, and then four months later it was swapped out for a new custom-built NativeLoglet that gave a 10x improvement in end-to-end latency. In Facebook’s implementation of NativeLoglet, seal simply sets a bit on a quorum of servers.

Virtualization 126

Virtualization Latency Storage Systems 126

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. This server is spending about a third of its CPU cycles just checking the time! In 2019 myself and others tested kvm-clock and found it was only about 20% slower than tsc. 30.14% in the middle of the flame graph.

Speed 52

Speed Java AWS Virtualization 52

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. This server is spending about a third of its CPU cycles just checking the time! In 2019 myself and others tested kvm-clock and found it was only about 20% slower than tsc. 30.14% in the middle of the flame graph.

Speed 40

Speed Java AWS Virtualization 40

Alex Russell

MARCH 6, 2021

India has been the epicentre of smartphone growth in recent years, owing to the sheer size of its market and an accelerating shift away from feature phones which made up the majority of Indian mobile devices until as late as 2019. So what did $150USD fetch in 2019? The smooth, dulcet tones of 2019's Moto E6. " package.

Performance 124

Performance Network Cache Metrics 124

SQL Performance

APRIL 8, 2019

These AMD EPYC processors have a number of advantages for SQL Server workloads, as I will explain in this article. This 14nm first-generation AMD EPYC 7551 processor has 32 cores and 64 threads, and it works in one or two-socket servers. This makes it a good choice for many SQL Server workloads, especially DW workloads.

Azure 42

Azure Virtualization Storage Benchmarking 42

HammerDB

OCTOBER 12, 2018

For anyone benchmarking MySQL with HammerDB it is important to understand the differences from sysbench workloads as HammerDB is targeted at a testing a different usage model from sysbench. maximum transition latency: Cannot determine or is not supported. . HammerDB difference from Sysbench. hardware limits: 1000 MHz - 3.80

Best Practices 40

Best Practices Scalability Performance C++ 40