Ståle Pedersen @stalep
Middleware Performance Team Lead at Red Hat. Throw frisbees and brew beer when time permits. Eydehavn, Norway Joined March 2009-
Tweets1K
-
Followers288
-
Following163
-
Likes2K
After few days studying how go and other runtimes implements work-stealing the Loom custom scheduler - I've built a new one for @netty_project (but can be used with any transport you like as #aeron or #dpdk..) on locality-first principles, see github.com/franz1981/Nett… (1/2)
Getting tired of constant @github issues. - if I only press "Add review Comment" enough times and at the same time curse very hard in Norwegian it does sometimes work...
Been working on picocli to aesh migration the last few weeks for JBang. The startup difference is amazing - 2-17x faster. JVM mode is now amazing but native mode is even faster lesson learned again and again - reflection is a startup killer; build-time makes all the difference
@gunnarmorling If you're happy then you're golden 😉
@maxandersen Not programmatically, but you can specify what to look for.
"Why does our top performer get the worst reviews?" the boss asked. I was reviewing their annual performance data. "Show me," I said. She pulled up the ratings. Diana: 2.8 out of 5. Below average on "collaboration." Low marks for "team player." "What's her actual performance?" I asked. "Exceeded every target. Landed our biggest client. Trained three new hires." "So why the low scores?" "Her peer reviews are dragging her down." I scanned the comments. "Too direct." "Challenges ideas too much." "Not supportive enough." "Let me talk to Diana," I said. "I used to give honest feedback," Diana told me. "Said our pricing model was broken. Got dinged for 'negativity.'" "What happened with the pricing?" "They finally fixed it six months later. After we lost two major accounts." "What else?" "I questioned why we needed eleven approvals for a simple contract change. Manager said I wasn't being collaborative." "Are you still giving feedback?" "No. I learned my lesson. Now I smile. Nod. Say everything's great. My reviews are improving." "But nothing's actually improving?" "We're making the same mistakes. Just with better vibes." She chuckled. I went back to the boss. "Your review system doesn't measure performance," I said. "It measures compliance." "That's not true." "When was the last time someone got promoted for challenging bad ideas?" Silence. "When did someone get rewarded for preventing a mistake?" More silence. "You've trained your best people to stay quiet. And your mediocre people to stay nice." A few months later, they redesigned the system. Added a category: "Constructive Challenge." Points for identifying problems early. Rewards for preventing costly mistakes. Diana got promoted. "What changed?" I asked the boss. "We stopped confusing agreement with alignment. Stopped mistaking silence for harmony." "And?" "Turns out our 'difficult' people were our most valuable. They actually cared enough to speak up." Here's the truth about performance reviews: Most companies don't reward performance. They reward performance theater. The person who says the meeting was great beats the person who says it wasted an hour. The person who agrees with bad ideas beats the person who prevents disasters. You think you're measuring contribution. You're measuring conformity. And your best people? They've already figured out the game. They're just deciding whether to play it or find somewhere that values truth over comfort.
Struggling with Java scalability in containers? 🧐 The App Services Performance Team explains how tiered compilation and CPU resource constraints can cause performance bottlenecks! #Java #Performance #Kubernetes #OpenJDK #Scalability 👇 redhatperf.github.io/post/method-da…
Struggling with unreproducible performance testing? Discover how we leveraged qDup,a powerful scripting orchestrator, to achieve consistent and comparable setups, transforming collaboration and improving our process. Read more about our journey here 👉 redhatperf.github.io/post/superhero…
Another excellent article from the IBM Runtimes Perf team covering how we used qdup to ensure we could reproduce perf tests between teams in different companies; redhatperf.github.io/post/superhero… #performance #automation
🗓️ Giovedì 20 Febbraio 2025 👉 "An accidental conspiracy: how your load generator is lying to you" in presenza e YouTube live! 🙏 presenta Andrea Lamparelli Hybrid mode: 🚨 per partecipare in presenza: eventbrite.com/e/an-accidenta… ⚠️ Dettagli: jugmilano.it/meeting-161.ht…
youtube.com/watch?v=dCryQg… Dear @Devoxx thanks for this, I really hope people which love #benchmarking and #performance, but normal devs as well, will have something to learn and fun with it 🥰
"Lets just do 30 minutes" was what Josh Long said but once we got started it took a bit more. Go watch Josh and I's conversation about JBang this early Sunday morning. buff.ly/3ZMGFX8
I am pretty proud of bugs.openjdk.org/browse/JMC-8144 since I've modelled this index on what garbagecat does and is very useful when #openshift limits doesn't allow to run with proficiency #java concurrent GCs
@SanneGrinovero Do you have extra rooms? 😉
Premature abstraction is WAY more prevalent and worse than premature optimization and really handcuffs code bases for years and years.
Max Rydahl Andersen @maxandersen
4K Followers 1K Following Quarkus lead - Distinguished Engineer, Red Hat. Creator of https://t.co/0ZZd16V8jf. @maxandersen.xam.dk (bsky)
Gunnar Morling 🌍 @gunnarmorling
70K Followers 297 Following Technologist @Confluentinc · Ex-lead of Debezium · Spec lead of Bean Validation 2.0 · Creator of Hardwood, kcctl, JfrUnit, MapStruct · Java Champion · 🚴
Mario Fusco @mariofusco
50K Followers 335 Following Java Champion ~ Open source advocate ~ Frequent speaker ~ @jugmilano coordinator ~ @QuarkusIO and @langchain4j committer at @IBM ~ Pragmatic dreamer ~ Europeist
Marc Savy @marcsavy
512 Followers 513 Following Black Parrot Labs founder (https://t.co/EjZIaatJhM). Open sourcer. Project maintainer and co-founder of Apiman (https://t.co/thAQRMKsye). Former Red Hatter.
Sanne @SanneGrinovero
2K Followers 685 Following Quarkus co-founder & Hibernate specialist. Architect @ IBM middleware / ex Red Hat. Java Champion. Maniacal tendencies to improve any OSS project he likes.
Dimitris Andreadis @dandreadis
2K Followers 650 Following Sr. Engineering Director (Red Hat) overseeing Quarkus & Cloud Native Runtimes/JBoss/Wildly teams @ IBM. JBoss Veteran & Open Source Advocate. Opinions are mine.
Julien Ponge @jponge
3K Followers 1K Following Software enthusiast | Scientist | @Java_Champions | Personal account, not the views of my employers | https://t.co/ZA6mcLwdlX
Aleksey Shipilëv @shipilev
28K Followers 582 Following In love-hate relationship with machines. Doing weird stuff, so you don't have to. Personal account, expect no perfection. Currently: everything OpenJDK at AWS.
Clebert Suconic @clebertsuconic
725 Followers 572 Following RedHatter, ActiveMQ Apache Commiter, Messaging guy, Musician, HornetQ co Creator (now ActiveMQ Artemis), Brasileiro na Florida
Brian Stansberry @bestansberry
427 Followers 77 Following Software Engineer at IBM @WildFlyAS project lead
Ingo @lasombra_br
1K Followers 1K Following Engineering Manager @ IBM. Heavy Metal lover. Amateur photographer. MMA fan. Eternal learner. Opinions my own.
Gavin King ⍼⍼⍼ @1ovthafew
5K Followers 1K Following Distinguished Engineer at IBM / Red Hat Middleware. Creator of @Hibernate ORM, @CDIspec, and @CeylonLang. Working on @JakartaEE Persistence, Query, and Data.
Mark Little @nmcl
3K Followers 313 Following I work for IBM, where I lead JBoss, WebSphere technical direction and research/development.
Justin Lee @evanchooly
3K Followers 803 Following Java Champion. Kotlin fanatic. Bit twiddler. New Yorker. Pronounces it jif. SSE at @Datadog. @[email protected]
Norman Maurer @normanmaurer
11K Followers 294 Following Distinguished Engineer @Apple , @netty_project Lead, #swiftnio, @TheASF, Author #Netty in Action @manningbooks, Apache #Cassandra MVP, @Java_Champions
Martin Stefanko @xstefank
820 Followers 580 Following Quarkus Core Engineer @IBM, @BrnoJUG leader, @QuarkusIO, @smallrye_io, @MicroProfileIO, author https://t.co/UIv3yfZzJ3, opinions are my own https://t.co/A4ekRQpKxL
George Gastaldi 🇧�... @gegastaldi
2K Followers 392 Following Principal Software Engineer @IBM @quarkusio core team member. JBoss Forge Project lead. Views are my own (not on behalf of Red Hat, Inc.)
Jason Lee @jasondlee
2K Followers 2K Following Follower of Jesus. Husband. Father. Bassist. Martial Artist. Java Champion. Software engineer @ IBM. @OKCJUG President. Opinions are mine, but can be yours.
Noatheapl @NoatheaplmAv
12 Followers 624 Following
Harlee Mee @harlee_mee
33 Followers 7K Following would you still be my friend, I’m lonely love 💞🌹💞🤗🧜♂️🪖🐶🐠🦀🦞
SusannaNewman @0H1jOiD70zowN9t
12 Followers 1K Following
lampajr @lampajr95
28 Followers 60 Following
Ashwin Jayaprakash @ashwinjay
220 Followers 4K Following Falling into the future at light speed. (Any opinions expressed are my own)
schrepfler @schrepfler
975 Followers 5K Following VP of Engineering at Huddle Tech. Opinions are my own. ULC minister. He/Him
Кэти @yhArIeLa
33 Followers 475 Following
LangChain4j @langchain4j
3K Followers 883 Following Build LLM-powered applications in Java, Quarkus and Spring Boot. Chatbots, agents, RAG and much more! https://t.co/5nBDPenP6l
Sharat Chander @shara... @Sharat_Chander
21K Followers 5K Following 🏳️🌈 🇺🇸 🇮🇳 🇺🇦 🇮🇱 🇵🇸 | LEGACY VERIFIED | #Java #DevRel leader | 💜 @u2 & @DepecheMode | @UofMaryland & @LoyolaMaryland grad | Views are mine own
Apolo Wilker @ApoloWilker
79 Followers 996 Following Ciência da computação (1/8). Desenvolvedor Full Stack, Node, React e React Native.
Zvika Almog @ZvikaAlmog
126 Followers 3K Following I code to bring people together, and tweet about it occasionally. Eng. Mng. @AppsFlyerDev, formerly @matific, https://t.co/J5LLvTi9Zc
monorepo @H7Camilo
160 Followers 3K Following
Clement Escoffier @clementplop
4K Followers 643 Following Doing reactive stuff. Distinguished Engineer @Redhat. Java Champion. #quarkus #vertx #smallrye. Rabbit shepherd. Opinions are mine not of my employer.
Pratik Chitode @pratik_chitode
11 Followers 387 Following
drwhite @drwhite
101 Followers 264 Following My team works on optimization of Java workloads (Cassandra, Kafka, OpenSearch and benchmarks), through the JVM, down to the cpu @intel. Tweets are my own.
twtwr @tr_twtr
359 Followers 5K Following
Shung-Hsi Yu @shunghsiyu
399 Followers 1K Following Kernel Engineer @SUSE messing with BPF #StandWithUkraine 💙💛 Also at @[email protected]
Jonas Pettersson @petterssonsoftw
207 Followers 2K Following Rust, Go, Embedded, Webassembly and containers
hantsy @hantsy
1K Followers 2K Following Open source contributor, blogger, freelancer and tech nerd. Coding Jakarta EE, Spring/Quarkus/Micronaut, Kotlin, Typescript(esp. Angular), etc.
peina @PanThecoll
34 Followers 3K Following
senthil kumar @senthilsam28
22 Followers 5K Following
lichtin @lichtin
10 Followers 848 Following
Eric Deandrea (@ericd... @edeandrea
1K Followers 263 Following @Java_Champions | Trying to not be here anymore - find me at https://t.co/cdGztVYBFM
Pradeep Kumar Suriset... @pradeepkumars
246 Followers 1K Following Performance & Scale Senior Engineering Manager @RedHat (Opinions are my own).
Michael @Michael33137312
136 Followers 707 Following
Dmytro Pishchukhin �... @dpishchukhin
329 Followers 2K Following Java/OSGi Architect | Data Pipelines from Edge Devices to Big Data | IT/OT Security Specialist | Passionate About Open Source
ESVA Inc. @ESVAInc
210 Followers 1K Following Find the perfect fit with ESVA's solutions for the Public Sector
Pawan Maurya @pawan_0108
45 Followers 368 Following
Erin A. Boyd @erinaboyd
2K Followers 1K Following Director of Emerging Technologies @ Red Hat. Distinguished Engineer. Mom at scale. Boat rocker
Innzs @MFfLinnd
0 Followers 5K Following
Fatih Kaan Tuncer @tuncerkaan
24 Followers 130 Following software developer @trendyol, instructor @sabanciu, petrolhead, gamer, retired audiophile
David Ogbonna @DavidOg52328843
300 Followers 4K Following
sigrid b sandum @sigridbsandum
65 Followers 236 Following
Jonathan Dowland (ove... @jmtd
672 Followers 1K Following On Twitter hiatus. Find me on the Fediverse https://t.co/aJ6e2XfpTk @[email protected] Software engineer @RedHat. PhD @computingncl. @Debian. Amateur archivist
Sourav Majumder @MSourav99
109 Followers 1K Following Hi, I am Sourav Majumder. Doing my PhD in CS at University of Wyoming as a Graduate Research Assistant.
kto-to @ArturGr60201842
5 Followers 40 Following
Max Rydahl Andersen @maxandersen
4K Followers 1K Following Quarkus lead - Distinguished Engineer, Red Hat. Creator of https://t.co/0ZZd16V8jf. @maxandersen.xam.dk (bsky)
Gunnar Morling 🌍 @gunnarmorling
70K Followers 297 Following Technologist @Confluentinc · Ex-lead of Debezium · Spec lead of Bean Validation 2.0 · Creator of Hardwood, kcctl, JfrUnit, MapStruct · Java Champion · 🚴
Mario Fusco @mariofusco
50K Followers 335 Following Java Champion ~ Open source advocate ~ Frequent speaker ~ @jugmilano coordinator ~ @QuarkusIO and @langchain4j committer at @IBM ~ Pragmatic dreamer ~ Europeist
Marc Savy @marcsavy
512 Followers 513 Following Black Parrot Labs founder (https://t.co/EjZIaatJhM). Open sourcer. Project maintainer and co-founder of Apiman (https://t.co/thAQRMKsye). Former Red Hatter.
Sanne @SanneGrinovero
2K Followers 685 Following Quarkus co-founder & Hibernate specialist. Architect @ IBM middleware / ex Red Hat. Java Champion. Maniacal tendencies to improve any OSS project he likes.
Dimitris Andreadis @dandreadis
2K Followers 650 Following Sr. Engineering Director (Red Hat) overseeing Quarkus & Cloud Native Runtimes/JBoss/Wildly teams @ IBM. JBoss Veteran & Open Source Advocate. Opinions are mine.
Sébastien Blanc 🇪... @sebi2706
11K Followers 3K Following Technical Director, Experienced Developer Relations Engineer, husband, speaker, Dad, Open Source, Platform Engineering, Java Champion, 5️⃣😺
Julien Ponge @jponge
3K Followers 1K Following Software enthusiast | Scientist | @Java_Champions | Personal account, not the views of my employers | https://t.co/ZA6mcLwdlX
Aleksey Shipilëv @shipilev
28K Followers 582 Following In love-hate relationship with machines. Doing weird stuff, so you don't have to. Personal account, expect no perfection. Currently: everything OpenJDK at AWS.
Clebert Suconic @clebertsuconic
725 Followers 572 Following RedHatter, ActiveMQ Apache Commiter, Messaging guy, Musician, HornetQ co Creator (now ActiveMQ Artemis), Brasileiro na Florida
Brian Stansberry @bestansberry
427 Followers 77 Following Software Engineer at IBM @WildFlyAS project lead
Ingo @lasombra_br
1K Followers 1K Following Engineering Manager @ IBM. Heavy Metal lover. Amateur photographer. MMA fan. Eternal learner. Opinions my own.
Gavin King ⍼⍼⍼ @1ovthafew
5K Followers 1K Following Distinguished Engineer at IBM / Red Hat Middleware. Creator of @Hibernate ORM, @CDIspec, and @CeylonLang. Working on @JakartaEE Persistence, Query, and Data.
Mark Little @nmcl
3K Followers 313 Following I work for IBM, where I lead JBoss, WebSphere technical direction and research/development.
Justin Lee @evanchooly
3K Followers 803 Following Java Champion. Kotlin fanatic. Bit twiddler. New Yorker. Pronounces it jif. SSE at @Datadog. @[email protected]
Heinz Kabutz 🏝 �... @heinzkabutz
18K Followers 500 Following Author of mildly entertaining somewhat useful #Java Specialists’ Newsletter https://t.co/lBcN4fqAHW. Email is heinz at javaspecialists dot eu.
Norman Maurer @normanmaurer
11K Followers 294 Following Distinguished Engineer @Apple , @netty_project Lead, #swiftnio, @TheASF, Author #Netty in Action @manningbooks, Apache #Cassandra MVP, @Java_Champions
Daniel Lemire @lemire
36K Followers 2K Following Software performance expert. Ranked in the top 2% of scientists globally (Stanford/Elsevier 2025) and among GitHub's top 1000 developers. Father, husband.
Mitchell Hashimoto @mitchellh
204K Followers 146 Following Creator of Ghostty. 👻 Prev founded @HashiCorp, created Vagrant, Terraform, Vault, and others.
Simon Willison @simonw
192K Followers 6K Following Creator @datasetteproj, co-creator Django. PSF board. Hangs out with @natbat. He/Him. Mastodon: https://t.co/t0MrmnJW0K Bsky: https://t.co/OnWIyhX4CH
Jonathan Blow @Jonathan_Blow
157K Followers 308 Following The free demo of Order of the Sinking Star is available this week only! ... https://t.co/JhmXeQ8zzA
DHH @dhh
703K Followers 198 Following Father of three, Creator of Ruby on Rails + Omarchy, Co-owner & CTO of 37signals, Shopify director, NYT best-selling author, and Le Mans 24h class-winner.
Neovim, e/plugins @Neovim
45K Followers 15 Following Posts refer to Nvim 0.13 (dev build). Discuss usage/config/ideas at: https://t.co/mfM6kFnSfE
John Carmack @ID_AA_Carmack
2.4M Followers 286 Following AGI at Keen Technologies, former CTO Oculus VR, Founder Id Software and Armadillo Aerospace
Ivan Velichko @iximiuz
74K Followers 563 Following Software Engineer. Educator. Entrepreneur. Bootstrapping https://t.co/9b6sZ2UVQj - a learning-by-doing platform to master Linux, Containers, and Kubernetes 🚀
Chris Wright @kernelcdub
7K Followers 272 Following Red Hat CTO. Tezos Foundation council member. Passion for open source SW innovation. Father and husband. Cyclist. Human.
lampajr @lampajr95
28 Followers 60 Following
George Hotz 🌑 @realGeorgeHotz
304K Followers 204 Following President @comma_ai. Founder @__tinygrad__
JVM Performance @JVMPerformance
3K Followers 0 Following #JVMPerformance - source for cool videos, and in-depth articles on #jvm #performance from the community 🔥🚀
Jean-Philippe Bempel ... @jpbempel
3K Followers 207 Following Sr Sw Eng @Datadoghq, optimize software running on JVM. Love performance topics and mechanical sympathy supporter. Java Champion & @javamissionctrl committer
LangChain4j @langchain4j
3K Followers 883 Following Build LLM-powered applications in Java, Quarkus and Spring Boot. Chatbots, agents, RAG and much more! https://t.co/5nBDPenP6l
Sharat Chander @shara... @Sharat_Chander
21K Followers 5K Following 🏳️🌈 🇺🇸 🇮🇳 🇺🇦 🇮🇱 🇵🇸 | LEGACY VERIFIED | #Java #DevRel leader | 💜 @u2 & @DepecheMode | @UofMaryland & @LoyolaMaryland grad | Views are mine own
Clement Escoffier @clementplop
4K Followers 643 Following Doing reactive stuff. Distinguished Engineer @Redhat. Java Champion. #quarkus #vertx #smallrye. Rabbit shepherd. Opinions are mine not of my employer.
Eric Deandrea (@ericd... @edeandrea
1K Followers 263 Following @Java_Champions | Trying to not be here anymore - find me at https://t.co/cdGztVYBFM
Pradeep Kumar Suriset... @pradeepkumars
246 Followers 1K Following Performance & Scale Senior Engineering Manager @RedHat (Opinions are my own).
Yuval Noah Harari @harari_yuval
658K Followers 166 Following Historian and bestselling author of 'Sapiens', 'Homo Deus', '21 Lessons for the 21st Century', 'Nexus', 'Unstoppable Us' and 'Sapiens: A Graphic History'.
Daniel Oh @danieloh30
4K Followers 193 Following @Java_Champions, @CNCFAmbassadors & TAG DevEx , Microsoft MVP, Developer Advocate 🥑, Technical Marketing, Keynote Speaker, Published Author @QuarkusIO
Martin Stefanko @xstefank
820 Followers 580 Following Quarkus Core Engineer @IBM, @BrnoJUG leader, @QuarkusIO, @smallrye_io, @MicroProfileIO, author https://t.co/UIv3yfZzJ3, opinions are my own https://t.co/A4ekRQpKxL
Johannes Bechberger @parttimen3rd
2K Followers 115 Following Hacking on OpenJDK and profilers at @SweetSapMachine
Pete Johanson (he/him... @petejohanson
538 Followers 500 Following Creator/project lead of @ZMKFirmware. Former Director, Software Engineering at @crossoverhealth, owner @LowProGalaxy.
Erin A. Boyd @erinaboyd
2K Followers 1K Following Director of Emerging Technologies @ Red Hat. Distinguished Engineer. Mom at scale. Boat rocker
sigrid b sandum @sigridbsandum
65 Followers 236 Following
Sebastian Daschner @DaschnerS
8K Followers 281 Following Helping developers solving the challenges of enterprise software. Java Champion, consultant, trainer, book author, creator of @DayCaptainApp
RedHatJava @RedHatJava
3K Followers 158 Following This account is being sunset as of May 2026. Follow @RedHat and @rhdevelopers for more content related to open source development.
Vaclav Tunka (EN) @vtunka
2K Followers 5K Following Engineering lead at @RedHat: @OpenShift cloud-native portfolio @KnativeProject, @kedaorg, K8s serving for AI/ML. Languages, sport, travel. My own opinions.
Giuseppe Scrivano @gscrivano
1K Followers 550 Following Software Engineer @RedHat | Linux Containers | AI @[email protected] on Mastodon
Jonathan Dowland (ove... @jmtd
672 Followers 1K Following On Twitter hiatus. Find me on the Fediverse https://t.co/aJ6e2XfpTk @[email protected] Software engineer @RedHat. PhD @computingncl. @Debian. Amateur archivist
Alex Porcelli @porcelli
3K Followers 419 Following Co-Founder @ Aletyx - Bridging Symbolic AI + GenAI for Enterprise AI | PPMC Apache KIE - 17+ yrs Driving Drools, jBPM and Kogito | ex-IBM ex-Red Hat
Charles Oliver Nutter @headius
14K Followers 214 Following JRuby guy, Java, Ruby, OSS business liaison. Find me: @[email protected] or @headius.bsky.social Sponsor me: https://t.co/G5oUTdTJqA
Stéphane Épardaud @UnFroMage
821 Followers 148 Following FroMage. Works on Quarkus, Vert.x, Ceylon for Red Hat, co-lead of Riviera JUG, Riviera DEV and is generally French…
Dinakar Guniguntala @dinogun
398 Followers 377 Following ❤️ OpenSource, Volleyball ... Life ! Architect #Kruize Autotune #adoptopenjdk Views are my own.
Andrew Haley is aph13... @AndrewHaley13
456 Followers 747 Following Personal acct. I do not speak for my employer or anyone else. Whoever believes that technology has its own agency and we can but submit is a superstitious fool.
Trends for United States
You might like
