Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Checking those available: $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource.

Speed 126

Speed Java AWS Virtualization 126

IO River

NOVEMBER 2, 2023

This type of traffic originates directly from the server, making it more challenging to handle due to latency and server load considerations; it’s hard but not impossible. Statistics reveal that a 1% improvement in latency can lead to a 3% increase in viewer engagement, highlighting its significance in live content delivery.3.

Architecture 52

Architecture Performance Internet Internet 52

IO River

NOVEMBER 2, 2023

This type of traffic originates directly from the server, making it more challenging to handle due to latency and server load considerations; it’s hard but not impossible. This is mainly because video files are notably bulkier than a simple text-based API request, which, in comparison, would be more like a droplet than an entire river.

Architecture 52

Architecture Performance Internet Internet 52

Dynatrace

JANUARY 15, 2020

Having released this functionality in an Preview Release back in September 2019, we’re now happy to announce the General Availability of our Citrix monitoring extension. Dynatrace is naturally suited to address these requirements with its automatic and AI-powered full-stack software intelligence platform. Dynatrace news. Citrix VDA.

Latency 36

Latency Performance Virtualization Infrastructure 36

Alex Russell

MAY 9, 2022

This is a complex topic, but to borrow from a recent post , web performance expands access to information and services by reducing latency and variance across interactions in a session, with a particular focus on the tail of the distribution (P75+). Consistent performance matters just as much as low average latency.

Performance 86

Performance Latency Metrics Engineering 86

The Morning Paper

AUGUST 29, 2019

We focused on OLAP-oriented parallel data warehouse products available for AWS and restricted our attention to commercially available systems. For cost calculations, the costs are a combination of compute costs, storage costs, data scan costs, and software license costs. Key findings. Query restrictions.

Architecture 76

Architecture Cloud Storage Serverless 76

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. A quick check of basic performance statistics showed over 30% higher CPU consumption. us on Ubuntu.

Speed 52

Speed Java AWS Virtualization 52

Alex Russell

APRIL 29, 2021

This post mines publicly available data on the pace of compatibility fixes and feature additions to assess the claim. The information it captures is, however, available going back somewhat further, providing a fuller picture of the trend lines of engine completeness. Count of APIs available from JavaScript by Web Confluence.

Media 145

Media Games Education Engineering 145

Smashing Magazine

MAY 16, 2022

By stepping back and realizing that the fields available have no special bindings to particular types of data, we can see that this technique is also an effective delivery mechanism for any arbitrary data allowing lots of interesting possibilities. This is important because of the need to manage memory. Wrapping Up.

Servers 93

Servers Monitoring Cache Network 93

Brendan Gregg

AUGUST 8, 2017

Based on the date, I looked up the kernel mailing list archives to find the actual patch, but the oldest email available is from June 1995, when the sysadmin writes: "While working on a system to make these mailing archives scale more effecitvely I accidently destroyed the current set of archives (ah whoops).". Yes, I'd say so.

Latency 111

Latency Metrics C++ Systems 111

HammerDB

OCTOBER 23, 2023

Stored Procedures and Client SQL comparison To test the stored procedures and client implementations, we ran both workloads against a system equipped with Intel Xeon 8280L. Use the performance metrics available in the database first before looking at data further down in the stack. On MySQL, we saw a 1.5X performance advantage.

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%. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Software-based clocksources could fix those issues and provide accurate monotonically-increasing time.

Speed 40

Speed Java AWS Virtualization 40

The Netflix TechBlog

JUNE 13, 2023

By collecting and analyzing key performance metrics of the service over time, we can assess the impact of the new changes and determine if they meet the availability, latency, and performance requirements. A dial is a software construct that enables the controlled flow of traffic within a system.

Traffic 279

Traffic Metrics Systems Strategy 279

John McCalpin

JANUARY 22, 2018

Each of the two vector units can issue one FMA instruction per cycle, assuming that there are enough independent accumulators to tolerate the 6-cycle dependent-operation latency. This is an uninspiring fraction of peak performance that would normally suggest significant inefficiencies in either the hardware or software. 2 24 3 27 13.5

Latency 40

Latency Hardware Code Testing 40

ScaleOut Software

MAY 15, 2014

We have spent a great deal of time at ScaleOut Software re-architecting our in-memory data grid (IMDG)’s code base to make best use of many cores and large memory. Likewise, object access paths must be heavily multi-threaded and avoid lock contention to minimize access latency and maximize throughput. Testing Scale-Up Performance.

Cache 40

Cache Servers Network Design 40

Percona

MAY 2, 2023

Also, we will take a look at our open-source backup utility custom-built to help avoid costs and proprietary software – Percona Backup for MongoDB or PBM. Hence, the node would still be available for other operations. Caveat: Good as long as you have the additional resources available for running the parallel threads.

Best Practices 52

Best Practices Database Storage Servers 52

Smashing Magazine

JANUARY 11, 2021

Alternatively, you can also use: Addy Osmani’s Chrome UX Report Compare Tool , Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing). Layout Shift GIF Generator that visualizes CLS with a simple GIF (also available from the command line).

Performance 145

Performance Cache Media Metrics 145

The Netflix TechBlog

FEBRUARY 20, 2019

by Jason Koch , with Martin Spier , Brendan Gregg , Ed Hunter Improving the tools available to our engineers to help them diagnose, triage, and work through software performance challenges in the cloud is a key goal for the cloud performance engineering team at Netflix. 10–20 MB/sec (it is, unsurprisingly, receiving lots of data).

Performance 211

Performance Latency Open Source Metrics 211

Alex Russell

JULY 14, 2021

The situation is even more acute in WebView IABs, which tend not to fully support features from these categories even when they appear available to developers via script. No documentation is available for third-party web developers from any of the largest WebView IAB (ab)users. How can that be?

Google 121

Google Mobile Engineering Internet 121

HammerDB

OCTOBER 12, 2018

Finally it is also important to note that this comparison is focused around OLTP based workloads, HammerDB also supports a TPC-H based workload for analytics with complex ad-hoc queries. CPUs which need to have their frequency coordinated by software: 0 . maximum transition latency: Cannot determine or is not supported. .

Best Practices 40

Best Practices Scalability Performance C++ 40

Brendan Gregg

SEPTEMBER 5, 2017

What follows are topics that may be of interest to anyone looking to migrate their systems and skillset: scan these to find topics that interest you. ## ZFS ZFS is available for Linux via the [zfsonlinux] and [OpenZFS] projects, and more recently was included in Canonical's Ubuntu Linux distribution: Ubuntu Xenial 16.04 LTS (April 2016).

Virtualization 76

Virtualization AWS Engineering Hardware 76

Smashing Magazine

JANUARY 6, 2020

Alternatively, you can also use Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing). Paddy Ganti’s script constructs two URLs (one normal and one blocking the ads), prompts the generation of a video comparison via WebPageTest and reports a delta.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 7, 2019

To get a good first impression of how your competitors perform, you can use Chrome UX Report ( CrUX , a ready-made RUM data set, video introduction by Ilya Grigorik), Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing).

Performance 104

Performance Cache Network Metrics 104

The Agile Manager

DECEMBER 17, 2008

Traditionally in IT, our gatekeepers are typically several different waves of requirements and specification documents, then software, then test results, then a production event. But of bigger concern is the latency between the time when requirements are captured and the time they're available as working code in an environment.

Latency 40

Latency Code Metrics Testing 40

The Netflix TechBlog

MARCH 13, 2020

Compared to the most recent master version of libaom (AV1 reference software), SVT-AV1 is similar in compression efficiency and at the same time achieves significantly lower encoding latency on multi-core platforms when using its inherent parallelization capabilities.

Open Source 154

Open Source Efficiency C++ Speed 154

SQL Server According to Bob

JANUARY 11, 2020

​​ Various defragmentation ​​ utilities ​​ are ​​ available ​​ on the market today. The caching of data pages and grouping of log records helps remove much, if not all, of the command latency associated with a write operation.

Servers 40

Servers Cache Database Media 40

Smashing Magazine

AUGUST 22, 2021

Because we are dealing with network protocols here, we will mainly look at network aspects, of which two are most important: latency and bandwidth. Latency can be roughly defined as the time it takes to send a packet from point A (say, the client) to point B (the server). Two-way latency is often called round-trip time (RTT).

Performance 106

Performance Network Latency Servers 106

Smashing Magazine

SEPTEMBER 6, 2021

Finally, not inlining resources has an added latency cost because the file needs to be requested. As such, many firewall vendors currently recommend blocking QUIC until they can update their software. Luckily, other lower-level tools are available to help with this. Clients and QUIC Discovery. Wireshark, qlog and qvis.

Network 105

Network Servers Cache Traffic 105

Smashing Magazine

SEPTEMBER 29, 2021

Specific use cases may require image formats that support other features like: Software support: An image format may perform very well but is useless if browsers, CDN’s and other image manipulation tools do not recognize it. See the Pen [Image format comparison 2]([link] by Addy Osmani. Large preview ). The Old Guards: JPEG And PNG.

Open Source 144

Open Source Speed Website Google 144