Ordinary AI output requires extraordinary human verification. (Apologies to C. Sagan)

DR still in progress for AMZN.com itself ... 🧐

Productivity: If you want to be more productive, go to sleep. www.perfdynamics.com/Manifesto/gc...

Some performance consequences often overlooked in redundancy plans perfdynamics.blogspot.com/2014/03/perf...

Out of The Queue Comes ... Amdahl’s Law! www.perfdynamics.com/Papers/amdsy...

RIP James Lovell, commander of Apollo 13 (played by Tom Hanks in the movie of the same name), has died at age 97.

A. Displaying metrics, errors, etc., is not the same thing as displaying metric errors. 1. How it is (old school top) CPU usage: 5.79 %usr, 4.51 %sys, 89.68 %idl 2. How it could be (nay, SHOULD be) CPU usage: 5.79 ± 0.29 %usr, 4.51 ± 0.23 %sys, 89.68 ± 4.48 %idl

Online classroom buzz www.perfdynamics.com/Classes/comm... What Guerrilla Grads are saying about why you should become an alumnus. Enroll here www.perfdynamics.com/Classes/sche... 🎓 #performance #engineering #capacity #management #marketplace #trends #GCAP #GDAT #PDQW

PSA: New open access Journal of Systems Scalability launching. Editor-in-Chief: Carlos Juiz www.icck.org/jss #systems #architecture #performance #scalability

GCAP Day 10. What you missed: ❥ Avalanche vs. Paxos coordination scalability ❥ Memcache scalability analysis with USL ❥ Queueing models of Kubernetes control and data planes ❥ Class dismissed 📚 🎓🍻

Never let reality get in the way of a good performance model.

GCAP Day 9. What you missed: ❥ Rate limiting services via Guerrilla queueing models ❥ Performance visualization tools ❥ Zookeeper scalability analysis with the USL www.perfdynamics.com/Manifesto/US...

GCAP Day 8. What you missed: ❥ Linear vs Dynamic programming ❥ Benchmarking/load testing prats and pitfalls ❥ Prelim discussion about Kefka, Kubernetes ❥ What kind of scheduler is in the K8s control plane?

GCAP Day 7. What you missed: ❥ Python least_squares() seems to be a bloated implementation of codes in the "Numerical Recipes" book. ❥ To apply the USL, use curve_fit() instead. ❥ Multivariate regression: How to reattach (noisy) fingers to amputated daily "numero uno" data

GCAP Day 6. What you missed: ❥ USL scalability analysis lnkd.in/gxaaAiww ❥ Student gets PDQ 7.0 running on Python 3.12 👏🎉 lnkd.in/gPzzHiez ❥ Homework Q-5 solved (a) analytically (b) cf. with corresponding PyDQ model - Discussed why analytic calculation was wrong

Ditto for the performance analysis & capacity planning of computer systems in general: - Assume failure - Plan for resilience - Monitor everything - Analyze and predict performance and capacity - Have an exceptional performance team of skilled experts lnkd.in/g8eGRnYq

RIP Chuck Mangione www.youtube.com/watch?v=c4el...

Guerrilla Capacity Planning (GCAP) Online — EU Edition — registration is now OPEN Dates: July 21 through August 1, 2025 Times: 1500 - 1900 CET www.perfdynamics.com/Classes/sche... Click on the DETAILS box (at the RHS) to register www.eventbrite.com/e/guerrilla-...

#TIL Product Solutions Physicist 😳

I recently discovered the original 1992 paper where I first introduced the concept of barycentric coordinates for visualizing multiprocessor/multicore performance. www.perfdynamics.com/papers.pdf More modern renditions (animations) can be viewed here www.perfdynamics.com/Tools/tools....

Yep.

Guerrilla training classes (GCAP) online are brutal. Despite the rumors, there are no long lunches. Only performance zealots should apply. Next class starts July 21, 2025. www.perfdynamics.com/Classes/sche... #Performance #Training

Guerrilla Capacity Planning (GCAP) Online — EU Edition — registration is now OPEN Dates: July 21 through August 1, 2025 Times: 1500 - 1900 CET www.perfdynamics.com/Classes/sche... Click on the DETAILS box (at the RHS) to register www.eventbrite.com/e/guerrilla-...

TIL: Many happy returns of the day & The spirit of @Lyft lifts your spirits. 1. My only phone slid out of my pants' pocket during a Lyft ride this morning. Fortunately, Lyft has a "Help/Lost my phone" web page that I could access from my laptop.

Bill Atkinson, he of QuickDraw and MacPaint fame, has died at 74 of pancreatic cancer. news.ycombinator.com/item?id=4421...

Interesting to see LoadRunner is still alive. I haven't heard about LR anything in a long time, let alone LR Cloud. #load #test #performance www.linkedin.com/pulse/loadru...

Best Boggle board found after 20 years of casual computer searching www.bbc.co.uk/sounds/play/... starting @ 19:08 - Peak word: "replastering"

"DeepSeek-V3: Scaling Challenges," in Proc. 52nd Intl. Symp. Comp. Arch. (ISCA 2025), June 21-25, Tokyo, Japan. #scalability #Performance #GenAI #AI arxiv.org/pdf/2505.093...

Meantime on Kilauea ...

How to Quantify Scalability: Synopsis of The Universal Scalability Law (USL) has just been posted in PDF format for improved readability. I did this post haste so, reporting any typos, broken links, etc., is always appreciated. www.perfdynamics.com/Manifesto/US... #performance

1/2 Just updated my "Performance Ponderings" page. It covers my performance analysis papers published over 35 yrs. 😳 You may be thinking: Who cares about performance analysis that is so dated!? Amazingly, performance analysis (done right) is often not technology-dependent but time-independent.

My ICPE/WEPPE 2025 presentation slides speakerdeck.com/drqz/guerril... and the corresponding ACM paper dl.acm.org/doi/pdf/10.1...

ICPE/WEPPE Monday, May 5th @ 9am EDT esulabsolutions.godaddysites.com/sponsored-ev...

Just joined ICPE 2025 conference Slack.

PSA: Skype — the rotary phone of VOIP — will no longer be in service as of this coming Monday (May 5th, 2025).

OMG: Olo My Green !!! A never-before-seen color (christened "olo") has been produced by a team at @UCBerkeley www.science.org/doi/10.1126/... #color #science

ChatGPT, the fortune cookie of AI 🥁

Why are there no giants? The Data Analytics of Application Scaling speakerdeck.com/drqz/the-dat... #performance #engineering

My functional programming solution to a functional equation question on Twitter. perfdynamics.blogspot.com/2025/04/solv...

History of AI

My reply to a question about the definition of Manhattan distance on Linkedin. lnkd.in/gadMQ9gs

BREAKING: #AMD announced its next-generation EPYC™ processor, codenamed “Venice,” as the first HPC product taped out for the #TSMC advanced **2nm** VLSI fab process. N2 means transistor sizes ~50,000x smaller than the width of a human hair !!! www.amd.com/en/newsroom/...

Einstein left the building 70 years ago today. #physics

In response to a question about profiling CPU time or measuring "wall-clock time" as the better approach to improving application performance.

#TIL ErrorBar has been deprecated as of Mathematica 12 and replaced by the Around function. Here is Around applied to the famous Hanbury Brown & Twiss intensity interferometer data that provided the first accurate measurement of the angular size of Sirius A from Narrabri, Australia c.1956.

Looking forward to presenting "Guerrilla Techniques for Robust Performance Engineering" on Monday, May 5th @ 9am for WEPPE 2025 gist.github.com/DrQz/70681b8... #performance #engineering #Canada esulabsolutions.godaddysites.com/sponsored-ev...

"An empty product is unity" is a statement that appears on p.92 of Kleinrock, Vol.1 — Queueing Systems. Do you know what it means? Can you prove it? 🤓

"Superlinear Scalability: The perpetual motion of parallel performance," Comm. ACM, 2015 cacm.acm.org/practice/had... #Performance #Scale #database

That's a wrap for me at #APSSummit25 #Quantum #Physics #GenAI #LLM