CSS - Tricks

MARCH 16, 2020

Along with other general diagnostics and web performance metrics, a really useful feature of the report is that each of the key areas is aggregated into color-coded scores between 0-100. In lh.js , you’ll next want to delete the test console.log() and import the Lighthouse module so you can use it in your code. launchChrome('[link].

Google 82

Google Latency Website Metrics 82

The Morning Paper

JANUARY 30, 2020

Edge servers are the middle ground – more compute power than a mobile device, but with latency of just a few ms. Wasm functions contain native codes compiled at runtime, so they should not be directly migrated as normal JavaScript objects. Why would we want to live migrate web workers? Is the migration worth it though?

Mobile 104

Mobile Cloud Latency Games 104

Particular Software

SEPTEMBER 20, 2021

Some will claim that any type of RPC communication ends up being faster (meaning it has lower latency) than any equivalent invocation using asynchronous messaging. It’s less of an apples-to-oranges comparison and more like apples-to-orange-sherbet. There are more steps, so the increased latency is easily explained.

Benchmarking 97

Benchmarking Latency Servers Systems 97

CSS Wizardry

MAY 19, 2020

On a high-latency connection, this spells bad news. However, the execution of this header is bound by the response’s TTFB, which on high-latency networks can be very, very high. Put another-other way, this file is latency-bound, not bandwidth-bound. Comparisons and Visualisations. Let’s see what happens. Click here.

Google 364

Google Media Latency Metrics 364

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. The broken Java stacks turned out to be beneficial: They helped group together the os::javaTimeMillis() calls which otherwise might have have been scattered on top of different Java code paths, appearing as thin stacks everywhere.

Speed 126

Speed Java AWS Virtualization 126

Adrian Cockcroft

JANUARY 20, 2023

In comparison, for Linpack Frontier operates at 68% of peak capacity. This is a worrying trend for the HPC supercomputer market, and while a new HPL-MxP mixed-precision benchmark shows that it’s possible to leverage lower precision floating point, there’s a lot of existing code that needs 64bit.

Architecture 52

Architecture Latency Benchmarking AWS 52

Smashing Magazine

AUGUST 10, 2023

In contrast, tools like DebugBear and WebPageTest use more realistic throttling that accurately reflects network round trips on a higher-latency connection. DebugBear’s comparison feature goes beyond mini charts by providing larger charts that evaluate more things than I can possibly print for you here.

Speed 81

Speed Monitoring Testing Network 81

HammerDB

OCTOBER 23, 2023

Also, note in passing that we include a COMMIT statement in this procedure because one is included in the example code in TPC-C specification. 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.

Benchmarking 62

Benchmarking Database Network C++ 62

Smashing Magazine

MAY 16, 2022

Examples of non-timing information you could send: HTTP Response status code, regions, request ids, etc. This is how they offer drop-in monitoring of all requests being made without us needing to change our code to monitor a request. Code used to monitor resources (fetch, XHR, images, stylesheets, scripts, HTML, etc.)

Servers 92

Servers Monitoring Cache Network 92

Brendan Gregg

AUGUST 8, 2017

Nowadays, the source code to old operating systems can also be found online. Linux is also hard coding the 1, 5, and 15 minute constants. This state is used by code paths that want to avoid interruptions by signals, which includes tasks blocked on disk I/O and some locks. This, too, was a dead end. They aren't idle.

Latency 111

Latency Metrics C++ Systems 111

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. Who owns this code?

Performance 86

Performance Latency Metrics Engineering 86

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. The broken Java stacks turned out to be beneficial: They helped group together the os::javaTimeMillis() calls which otherwise might have have been scattered on top of different Java code paths, appearing as thin stacks everywhere.

Speed 52

Speed Java AWS Virtualization 52

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. We can determine A/B test membership in either device application or backend code and selectively invoke new code paths and services.

Traffic 279

Traffic Metrics Systems Strategy 279

The Morning Paper

MAY 28, 2019

We argue that race logic fits nicely with temporally-coded sensing systems,, such as 3D depth perception systems and dynamic vision sensors, where the time that a signal gets “excited” to a logic-level “1” depends on the magnitude of the sensor reading. Introducing race logic. Performance evaluation.

Energy 52

Energy Hardware Efficiency Architecture 52

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. The broken Java stacks turned out to be beneficial: They helped group together the os::javaTimeMillis() calls which otherwise might have have been scattered on top of different Java code paths, appearing as thin stacks everywhere.

Speed 40

Speed Java AWS Virtualization 40

John McCalpin

JANUARY 22, 2018

Introduction: In December 2017, my colleague Damon McDougall (now at AMD) asked for help in porting the fused multiply-add example code from a Colfax report ( [link] ) to the Xeon Phi x200 (Knights Landing) processors here at TACC. Instead, we found puzzle after puzzle. Instead, we found puzzle after puzzle.

Latency 40

Latency Hardware Code Testing 40

Brendan Gregg

OCTOBER 8, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Since I helped developed bpftrace, I'm aware of how fresh my own code is and how likely I introduced bugs. I wrote seeksize.d

C++ 110

C++ Virtualization Programming Latency 110

Smashing Magazine

JANUARY 11, 2021

Have we optimized enough with tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, progressive hydration, clients hints, HTTP/3, service workers and — oh my — edge workers? It’s much easier to reach performance goals when the code base is fresh or is just being refactored.

Performance 145

Performance Cache Media Metrics 145

Testsigma

JANUARY 30, 2021

The applications are designed using the same code base as Desktop like HTML, Javascript, and CSS. Test how user-friendly an application is: Google search engine gives high priority to websites in comparison to desktop apps. Unlike Native Applications, Mobile web applications do not have to be designed separately for IOS and Android.

Mobile 52

Mobile Testing Website Internet 52

The Morning Paper

DECEMBER 8, 2019

Therefore any programming abstraction must be low latency and the kernel needs to be kept off the path of persistent data access as much as possible. The Twizzler KVS (key-value store) is just 250 lines of C code, and uses one persistent object for the index structure, and a second one for the data.

Hardware 56

Hardware Programming Media Storage 56

KeyCDN

SEPTEMBER 12, 2019

The main reason is because it decreases the latency to the user where they are located by serving your images from a POP physically closest to them. jpg 605 KB 543 KB 70 KB 87% We then ran a page comparison test with GTmetrix, JPG vs WebP, and you can see the total difference in page size. jpg 480 KB 407 KB 43 KB 89% jpg-to-webp-2.jpg

Social Media 106

Social Media Media Google Website 106

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

Smashing Magazine

JANUARY 6, 2020

Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? It’s much easier to reach performance goals when the code base is fresh or is just being refactored.

Performance 145

Performance Cache Network Metrics 145

Brendan Gregg

OCTOBER 7, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Since I helped developed bpftrace, I'm aware of how fresh my own code is and how likely I introduced bugs. I wrote seeksize.d

C++ 40

C++ Virtualization Programming Latency 40

Smashing Magazine

JANUARY 7, 2019

Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? Estimated Input Latency tells us if we are hitting that threshold, and ideally, it should be below 50ms.

Performance 103

Performance Cache Metrics Network 103

Alex Russell

APRIL 29, 2021

After 20 years of neck-in-neck competition, often starting from common code lineages, there just isn't that much left to wring out of the system. For heavily latency-sensitive use-cases like WebXR, this is a critical component in delivering a good experience. Spurious reports of "10x worse" performance merit intense scepticism.

Media 145

Media Games Education Engineering 145

Brendan Gregg

SEPTEMBER 5, 2017

It uses a Solaris Porting Layer (SPL) to provide a Solaris-kernel interface on Linux, so that unmodified ZFS code can execute. There's also a ZFS send/recv code path that should try to use the TASK_INTERRUPTIBLE flag (as suggested by a coworker), to avoid a kernel hang (can't kill -9 the process). Tracing ZFS operation latency.

Virtualization 76

Virtualization AWS Engineering Hardware 76

Highly Scalable

MAY 1, 2012

This approach often leads to heavyweight high-latency analytical processes and poor applicability to realtime use cases. This process is illustrated in the following code snippet: class LinearCounter { BitSet mask = new BitSet(m) // m is a design parameter void add(value) { int position = hash(value) // map the value to the range 0.m

Analytics 191

Analytics Traffic Big Data Efficiency 191

The Netflix TechBlog

FEBRUARY 20, 2019

Today we are excited to announce latency heatmaps and improved container support for our on-host monitoring solution?—?Vector?—?to Remotely view real-time process scheduler latency and tcp throughput with Vector and eBPF What is Vector? to the broader community. Vector is open source and in use by multiple companies.

Performance 211

Performance Latency Open Source Metrics 211

Alex Russell

JULY 14, 2021

However, producing a complete and competitive WebView-based browser requires additional UI and glue code. Despite the common code lineage and exceedingly low cost to Facebook to develop, it fails to support half of the most meaningful PWA features, cutting third-party web developers off at the knees.

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. maximum transition latency: Cannot determine or is not supported. . cpupower frequency-info analyzing CPU 0: . hardware limits: 1000 MHz - 3.80

Best Practices 40

Best Practices Scalability Performance C++ 40

The Agile Manager

DECEMBER 17, 2008

Clearly, a small team delivering documentation is nowhere near as significant an event as a large team delivering executable code. 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. not assurances about the code.

Latency 40

Latency Code Metrics Testing 40

The Netflix TechBlog

JANUARY 24, 2022

Technically, “performance” metrics are those relating to the responsiveness or latency of the app, including start up time. It’s harder to reason about the performance profile of pre-production code since we can’t gather real-time metrics for code that hasn’t yet shipped. and often before they are even committed to the codebase.

Performance 199

Performance Metrics Performance Testing Testing 199

The Netflix TechBlog

MARCH 13, 2020

SVT-AV1 codebase status The SVT-AV1 repository includes both an AV1 encoder and decoder, which share a significant amount of the code. Reducing BD-rate between SVT-AV1 and libaom in 2-pass encoding mode The comparison results of the SVT-AV1 against libaom on objective-1-fast test set are presented in the table below.

Open Source 154

Open Source Efficiency C++ Speed 154

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 105

Performance Network Latency Servers 105

SQL Server According to Bob

JANUARY 11, 2020

​​ The following ​​ code ​​ example ​​ shows ​​ the setting ​​ of ​​ values ​​ in ​​ illegal ​​ array positions. SQL Server uses read-ahead logic to avoid query stalls caused by I/O waits.

Servers 40

Servers Cache Database Media 40

Smashing Magazine

AUGUST 9, 2021

You’ve probably heard things like: “HTTP/3 is much faster than HTTP/2 when there is packet loss”, or “HTTP/3 connections have less latency and take less time to set up”, and probably “HTTP/3 can send data more quickly and can send more resources in parallel”. HTTP/2 versus HTTP/3 protocol stack comparison ( Large preview ).

Transportation 145

Transportation Internet Internet Network 145