Brendan Gregg

SEPTEMBER 25, 2021

CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. This server is spending about a third of its CPU cycles just checking the time! Note that Ubuntu also has a frame to show entry into vDSO (virtual dynamic shared object). This was much worse many years ago on Xen virtual machine guests.

Speed 40

Speed Java AWS Virtualization 40

Brendan Gregg

SEPTEMBER 5, 2017

I've suggested adding a command to docker to make listing at least the top-level PIDs in containers easier. ## Virtual Machines The two main technologies on Linux are Xen and KVM (and there's Bhyve for BSD). Oracle VM Server is based on Xen. Outside of EC2, many other providers are deploying on KVM.

Virtualization 76

Virtualization AWS Engineering Hardware 76

SQL Performance

APRIL 8, 2019

Back on December 5, 2017, Microsoft announced that they were using AMD EPYC 7551 processors in their storage-optimized Lv2-Series virtual machines. These AMD EPYC processors have a number of advantages for SQL Server workloads, as I will explain in this article. AMD EPYC 7551 Details. The L3 cache size is 64MB.

Azure 42

Azure Virtualization Storage Benchmarking 42

The Symphonia

DECEMBER 6, 2017

Correspondingly, 3GB functions should see a 2x CPU performance improvement over 1.5GB Lambdas, but this is through doubling the number of cores the function has access to, rather than double the virtualized time-slices. That means that 3GB functions might not see a linear speed bump for primarily single threaded functions.

Serverless 40

Serverless Lambda AWS Traffic 40

SQL Performance

AUGUST 27, 2019

On August 7, 2019, AMD finally unveiled their new 7nm EPYC 7002 Series of server processors, formerly code-named "Rome" at the AMD EPYC Horizon Event in San Francisco. This is the second generation EPYC server processor that uses the same Zen 2 architecture as the AMD Ryzen 3000 Series desktop processors.

Servers 52

Servers Benchmarking Virtualization Architecture 52

Percona

SEPTEMBER 1, 2023

This blog was originally published in October 2017 and was updated in September 2023. Sharding in MongoDB is a technique used to distribute a database horizontally across multiple nodes or servers, known as “shards.” MongoDB distributes data across these shard servers to ensure an even distribution.

Best Practices 73

Best Practices Traffic Database Servers 73

All Things Distributed

OCTOBER 2, 2017

In support of Amazon Prime Day 2017, the biggest day in Amazon retail history, DynamoDB served over 12.9 VPC Endpoints give you the ability to control whether network traffic between your application and DynamoDB traverses the public Internet or stays within your virtual private cloud. million requests per second.

Internet 128

Internet Internet AWS Performance 128

SQL Server According to Bob

DECEMBER 31, 2018

How It Works: XEvent Output and Visualization SQL Server Management Studio Provides–“XE Profiler” Use the SSMS XEvent Profiler. Using SQL Server Management Studio (SSMS) and storing the events in a table requires reading the events, streaming to table storage followed by an order by event sequence query. The XEProfiler Sample.

Efficiency 40

Efficiency Code Servers Cache 40

Brendan Gregg

AUGUST 8, 2017

Thankfully, I found some older linux-devel mailing list archives, rescued from server backups, often stored as tarballs of digests. Anyway, the following patch seems to make the load average much more consistent WRT the subjective speed of the system. It's time in some cgroup paths, but this server is not doing much disk I/O.

Latency 111

Latency Metrics C++ Systems 111