Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. This was a weird problem to think about: Time itself had now become a resource and target of performance analysis. Try changing the kernel clocksource.

Speed 126

Speed Java AWS Virtualization 126

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory. Ford, et al., “TCP

Performance 110

Performance Latency Cache Virtualization 110

Dynatrace

APRIL 26, 2022

STM generates traffic that replicates the typical path or behavior of a user on a network to measure performance for example, response times, availability, packet loss, latency, jitter, and other variables). PC, smartphone, server) or virtual (virtual machines, cloud gateways). Endpoints can be physical (i.e.,

Monitoring 209

Monitoring Social Media IoT Metrics 209

Dynatrace

JULY 10, 2019

OneAgents are optimized to send data to the Dynatrace servers with the smallest possible impact, querying the metrics every minute, and the data is a first-class citizen for the Dynatrace AI root-cause analysis. JMX plugins are fully integrated into Dynatrace, and you can create them from the UI. OneAgent & cloud metrics.

Java 140

Java Best Practices Metrics Azure 140

IO River

NOVEMBER 2, 2023

A CDN (Content Delivery Network) is a network of geographically distributed servers that brings web content closer to where end users are located, to ensure high availability, optimized performance and low latency. In case of an error, a Virtual Edge solution also enables reverting to the previous configuration easily and quickly.5.

Best Practices 52

Best Practices Strategy Traffic Virtualization 52

Brendan Gregg

JULY 4, 2021

## References I've reproduced the talk references below, so you can click on links: - [Gregg 08] Brendan Gregg, “ZFS L2ARC,” [link] Jul 2008 - [Gregg 10] Brendan Gregg, “Visualizations for Performance Analysis (and More),” [link] 2010 - [Greenberg 11] Marc Greenberg, “DDR4: Double the speed, double the latency? Ford, et al., “TCP

Performance 140

Performance Latency Hardware Storage 140

Scalegrid

JANUARY 8, 2024

Artificial intelligence can automate tasks ranging from: data analysis resource provisioning system maintenance decision-making natural language processing This not only improves accuracy and reliability but also frees up valuable time for IT teams to focus on strategic tasks, such as resource management on platforms like Google Cloud.

Artificial Intelligence 147

Artificial Intelligence Cloud Scalability Analytics 147

IO River

NOVEMBER 2, 2023

A CDN (Content Delivery Network) is a network of geographically distributed servers that brings web content closer to where end users are located, to ensure high availability, optimized performance and low latency. In case of an error, a Virtual Edge solution also enables reverting to the previous configuration easily and quickly.5.

Best Practices 40

Best Practices Strategy Traffic Virtualization 40

Scalegrid

FEBRUARY 8, 2024

Durability Availability Fault tolerance These combined outcomes help minimize latency experienced by clients spread across different geographical regions. Key players include HDFS and Ceph, prominent choices among distributed storage options tailored specifically for massive dataset analysis tasks.

Storage 130

Storage Systems Big Data Azure 130

ACM Sigarch

MAY 31, 2023

There are three common mechanisms to access remote memory: modifying applications, modifying virtual memory, and hardware-level cache coherence support. even lowered the latency by introducing a multi-headed device that collapses switches and memory controllers. The recently announced CXL3.0

Latency 52

Latency Hardware Cache Architecture 52

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory. Ford, et al., “TCP

Performance 52

Performance Latency Cache Virtualization 52

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. This was a weird problem to think about: Time itself had now become a resource and target of performance analysis. Try changing the kernel clocksource.

Speed 52

Speed Java AWS Virtualization 52

Adrian Cockcroft

APRIL 5, 2023

This proposal seeks to define a standard for real-time carbon and energy data as time-series data that would be accessed alongside and synchronized with the existing throughput, utilization and latency metrics that are provided for the components and applications in computing environments.

Energy 52

Energy Metrics Cloud Operating System 52

The Netflix TechBlog

JANUARY 24, 2022

Technically, “performance” metrics are those relating to the responsiveness or latency of the app, including start up time. Every test runs on a combination of devices (physical and virtual) and platform versions ( SDKs ). For every test there will be background noise that we need to somehow filter from our analysis.

Performance 199

Performance Metrics Performance Testing Testing 199

HammerDB

OCTOBER 23, 2023

The data shows a scripted automated workload running a number of back to back tests each time with an increasing number of virtual users. Database information and performance schemas The best approach for database performance analysis is to take a top-down approach. The other ports shows the HammerDB Virtual Users.

Benchmarking 62

Benchmarking Database Network C++ 62

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. This was a weird problem to think about: Time itself had now become a resource and target of performance analysis. Try changing the kernel clocksource.

Speed 40

Speed Java AWS Virtualization 40

Brendan Gregg

AUGUST 18, 2019

For example, iostat(1), or a monitoring agent, may tell you your average disk latency, but not the distribution of this latency. bpftrace is suited for this kind of analysis: decomposing metrics into distributions or per-event logs, and creating new metrics for visibility into blind spots. Block I/O latency as a histogram.

Latency 68

Latency C++ Cache Programming 68

The Netflix TechBlog

MAY 5, 2021

To serve such applications, Netflix Drive can persist the ephemeral data in storage tiers which are closer to the application that allow lower read latencies and better economies for read request, since cloud storage reads incur an egress cost. The final encoded copy needs to be persisted and the ephemeral data can be deleted.

Media 174

Media Storage Architecture Cloud 174

Brendan Gregg

JULY 4, 2021

## References I've reproduced the talk references below, so you can click on links: - [Gregg 08] Brendan Gregg, “ZFS L2ARC,” [link] Jul 2008 - [Gregg 10] Brendan Gregg, “Visualizations for Performance Analysis (and More),” [link] 2010 - [Greenberg 11] Marc Greenberg, “DDR4: Double the speed, double the latency? Ford, et al., “TCP

Performance 52

Performance Latency Hardware Storage 52

ScaleOut Software

JULY 21, 2020

By transparently distributing stored objects across a cluster of servers (physical or virtual), it automatically scales performance for fast-growing workloads and maintains consistently low access latency. It also transparently makes use of the IMDG’s scalable computing resources to accelerate the analysis.

Analytics 52

Analytics Airlines Cache Scalability 52

ScaleOut Software

JULY 21, 2020

By transparently distributing stored objects across a cluster of servers (physical or virtual), it automatically scales performance for fast-growing workloads and maintains consistently low access latency. It also transparently makes use of the IMDG’s scalable computing resources to accelerate the analysis.

Analytics 52

Analytics Airlines Cache Scalability 52

ScaleOut Software

JULY 19, 2021

This data is also periodically uploaded to a data lake for offline batch analysis that calculates key statistics and looks for big trends that can help optimize operations. Hosted on a cluster of physical or virtual servers, it maintains memory-based state information about the history and dynamically evolving state of every data source.

IoT 78

IoT Analytics Big Data Architecture 78

All Things Distributed

AUGUST 20, 2015

Relationships are a fundamental aspect of both the physical and virtual worlds. Modern applications need to quickly navigate connections in the physical world of people, cities, and public transit stations as well as the virtual world of search terms, social posts, and genetic code, for example. The importance of relationships.

Database 134

Database Logistics Availability Social Media 134

ScaleOut Software

JULY 14, 2021

While Azure IoT offers a wide variety of services, it focuses on visualizing entities and events, extracting insights from telemetry streams with queries, and migrating events to storage for more intensive offline analysis. These capabilities are vitally important to extract the full potential of real-time intelligent monitoring.

IoT 52

IoT Azure Analytics Serverless 52

VoltDB

DECEMBER 8, 2017

Virtualization of appliances and systems is seen as a necessary step to add the agility to meet these increasing and evolving service demands. Questions were voiced by George Malim of VanillaPlus, and answered by VoltDB’s Seeta Somagani and Analysys Mason’s John Abraham, with some comments from George.

Latency 40

Latency Virtualization Cloud Software Engineering 40

VoltDB

DECEMBER 8, 2017

Virtualization of appliances and systems is seen as a necessary step to add the agility to meet these increasing and evolving service demands. Questions were voiced by George Malim of VanillaPlus, and answered by VoltDB’s Seeta Somagani and Analysys Mason’s John Abraham, with some comments from George.

Latency 40

Latency Virtualization Cloud Software Engineering 40

Smashing Magazine

OCTOBER 31, 2023

You might think of it like racing a car in virtual reality, where the conditions are decided in advance, rather than racing on a live track where conditions may vary. In contrast, lab reports contain a lot of analysis and recommendations on how to improve your page speed. Why Is My Lighthouse LCP Score Worse Than The Real User Data?

Speed 97

Speed Google Website Metrics 97

Brendan Gregg

OCTOBER 8, 2018

more capable, and built from the ground up for the modern era of the eBPF virtual machine. eBPF was created by Alexei Starovoitov while at PLUMgrid (he's now at Facebook) as a generic in-kernel virtual machine, with software defined networks as the primary use case. It's shaping up to be a DTrace version 2.0: eBPF does more.

C++ 110

C++ Virtualization Programming Latency 110

Adrian Cockcroft

NOVEMBER 18, 2019

OPN303 BPF performance analysis (repeats) Learn how Netflix uses eBPF to create powerful performance analysis tools. Brendan Gregg tours BPF tracing, with open source tools & examples for EC2 instance analysis. Alexandra Iordache (Firecracker maintainer) showcases Firecracker’s new snapshotting capability.

Open Source 40

Open Source AWS Lambda Serverless 40

Adrian Cockcroft

NOVEMBER 18, 2019

OPN303 BPF performance analysis (repeats) Learn how Netflix uses eBPF to create powerful performance analysis tools. Brendan Gregg tours BPF tracing, with open source tools & examples for EC2 instance analysis. Alexandra Iordache (Firecracker maintainer) showcases Firecracker’s new snapshotting capability.

Open Source 40

Open Source AWS Lambda Serverless 40

Dotcom-Montior

DECEMBER 8, 2021

You cannot virtualize everything…yet. An organization’s response to an incident, whether we are talking about downtime, security breaches or cyber-attacks, or even prolonged latency and repeated errors, is critical to the continued success of the business and trust from the customer or end user. Asset Management.

Social Media 90

Social Media Monitoring Latency DevOps 90

IO River

NOVEMBER 2, 2023

In massively multiplayer online games (MMOs), where players can trade virtual goods, downtime can even have real-world financial implications for players. Proactive monitoring aids in detecting performance bottlenecks, latency difficulties, and other anomalies that may influence availability.

Availability 52

Availability Social Media Traffic Games 52

IO River

NOVEMBER 2, 2023

In massively multiplayer online games (MMOs), where players can trade virtual goods, downtime can even have real-world financial implications for players. Proactive monitoring aids in detecting performance bottlenecks, latency difficulties, and other anomalies that may influence availability.

Availability 52

Availability Social Media Traffic Games 52

Brendan Gregg

JANUARY 17, 2018

It is used for capacity planning and scalability analysis. OSes usually show you virtual memory and resident memory, shown as the "VIRT" and "RES" columns in top. For large processes (> 100 Gbytes) this duration of higher latency can last over 1 second, during which this tool is consuming system CPU time.

Cache 71

Cache Latency C++ Programming 71

O'Reilly

DECEMBER 2, 2019

For applications like communication between AVs, latency–how long it takes to get a response–is more likely to be a bigger limitation than raw bandwidth, and is subject to limits imposed by physics. There are impressive estimates for latency for 5G, but reality has a tendency to be harsh on such predictions. Mike Loukides.

Wireless 53

Wireless Serverless IoT Artificial Intelligence 53

Brendan Gregg

AUGUST 8, 2017

rc5-virtual (bgregg-xenial-bpf-i-0b7296777a2585be1) 08/01/2017 _x86_64_ (8 CPU) 10:15:51 PM UID PID %usr %system %guest %CPU CPU Command 10:16:51 PM 0 18468 2.85 Some people have found values that seem to work for their systems and workloads: they know that when load goes over X, application latency is high and customers start complaining.

Latency 111

Latency Metrics C++ Systems 111

Brendan Gregg

SEPTEMBER 5, 2017

Here's some output from my zfsdist tool, in bcc/BPF, which measures ZFS latency as a histogram on Linux: # zfsdist. Tracing ZFS operation latency. My rock solid experience with Ubuntu is on an LTS release. ## Crash Dump Analysis It can be done. Many new tools can now be written, and the main toolkit we're working on is [bcc].

Virtualization 76

Virtualization AWS Engineering Hardware 76