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Java 25's new CPU-Time Profiler

news.ycombinator.com Johannes Bechberger 2025-09-24 09:11:27

This is the first part of my series; the other parts are Back to the blog post: More than three years in the making, with a concerted effort starting last year, my CPU-time profiler landed in Java with OpenJDK 25. It’s an experimental new profiler/method sampler that helps you find performance issues in your code, having distinct advantages over the current sampler. This is what this week’s and next week’s blog posts are all about. This week, I will cover why we need a new profiler and what in

Topics: cpu java jfr profiler time

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Java 25's new CPU-Time Profiler (1)

news.ycombinator.com Johannes Bechberger 2025-09-24 19:11:27

More than three years in the making, with a concerted effort starting last year, my CPU-time profiler landed in Java with OpenJDK 25. It’s an experimental new profiler/method sampler that helps you find performance issues in your code, having distinct advantages over the current sampler. This is what this week’s and next week’s blog posts are all about. This week, I will cover why we need a new profiler and what information it provides; next week, I’ll cover the technical internals that go beyon

Topics: cpu java jfr profiler time

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Weird CPU architectures, the MOV only CPU (2020)

news.ycombinator.com Unknown 2025-09-20 21:46:46

I like CPU architectures, especially weird, interesting and unusual ones. For example, the Intel iAPX 432 is still something I would love to play around with. Recently, I realized that a working CPU can be made with just a simple Move instruction. For this to work, everything needs to be memory mapped. The ALU, program counter, everything. Of course, this idea is nothing new and this idea is called the Transport Triggered Architecture. I decided to have a look into this, how it works and make a

Topics: address alu cpu mov t2

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CPU Utilization is Wrong (2017)

news.ycombinator.com Unknown 2025-09-28 03:06:39

The metric we all use for CPU utilization is deeply misleading, and getting worse every year. What is CPU utilization? How busy your processors are? No, that's not what it measures. Yes, I'm talking about the "%CPU" metric used everywhere, by everyone. In every performance monitoring product. In top(1). What you may think 90% CPU utilization means: What it might really mean: Stalled means the processor was not making forward progress with instructions, and usually happens because it is waitin

Topics: cpu cycles ipc memory utilization

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I am giving up on Intel and have bought an AMD Ryzen 9950X3D

news.ycombinator.com Michael Stapelberg 2025-10-05 14:54:29

The Intel 285K CPU in my high-end 2025 Linux PC died again! 😡 Notably, this was the replacement CPU for the original 285K that died in March, and after reading through the reviews of Intel CPUs on my electronics store of choice, many of which (!) mention CPU replacements, I am getting the impression that Intel’s current CPUs just are not stable 😞. Therefore, I am giving up on Intel for the coming years and have bought an AMD Ryzen 9950X3D CPU instead. What happened? Or: the batch job of death

Topics: amd cpu cpus intel power

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%CPU utilization is a lie

news.ycombinator.com Brendan Long 2025-10-13 05:01:02

I deal with a lot of servers at work, and one thing everyone wants to know about their servers is how close they are to being at max utilization. It should be easy, right? Just pull up top or another system monitor tool, look at network, memory and CPU utilization, and whichever one is the highest tells you how close you are to the limits. And yet, whenever people actually try to project these numbers, they find that CPU utilization doesn't quite increase linearly. But how bad could it possibly

Topics: 50 cpu utilization work workers

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The No-CPU Amiga Demo Challenge

news.ycombinator.com Unknown 2025-10-18 09:20:28

The No-CPU Amiga Demo Challenge This is an open challenge to create demos that run entirely on the Amiga custom chips without involving the CPU. This repository contains the rules of the challenge and a runner application for launching no-CPU demos. This is intended as a standard specification of the no-CPU platform for demo competitions. There will be a dedicated no-CPU Amiga demo competition at Gerp 2026, January 23-25, 2026. In addition, this is an ongoing challenge — an invitation to expl

Topics: amiga cpu demo memory ocs

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Like Intel before it, AMD blames motherboard makers for burnt-out CPUs

news.ycombinator.com Unknown 2025-10-19 05:54:42

AMD's X3D-series Ryzen chips have become popular with PC gamers because games in particular happen to benefit disproportionately from the chips' extra 64MB of L3 cache memory. But that extra memory occasionally comes with extra headaches. Not long after they were released earlier this year, some early adopters started having problems with their CPUs, ranging from failure to boot to actual physical scorching and burnout—the problems were particularly common for users of the 9800X3D processor in A

Topics: amd chips cpu motherboards problems

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GMP damaging Zen 5 CPUs?

news.ycombinator.com Unknown 2025-10-23 03:24:12

GMP damaging Zen 5 CPUs? Background We have fried two Ryzen 9950X CPUs in a few months by running GMP tests. This is not expected, of course. In this page, we provide as much information as possible to help analysing the problem. What causes these CPUs to die while running GMP is unknown to us. While similar, it is not the widely reported Asrock motherboard problem, as the motherboards we use are of a different make (see below). It might be that the Zen 5 CPUs pull more power than specified w

Topics: 2nd cpu cpus ddr5 mem

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Like Intel before it, AMD blames motherboard makers for burnt-out CPUs

arstechnica.com Unknown 2025-10-27 16:37:50

AMD's X3D-series Ryzen chips have become popular with PC gamers because games in particular happen to benefit disproportionately from the chips' extra 64MB of L3 cache memory. But that extra memory occasionally comes with extra headaches. Not long after they were released earlier this year, some early adopters started having problems with their CPUs, ranging from failure to boot to actual physical scorching and burnout—the problems were particularly common for users of the 9800X3D processor in A

Topics: amd chips cpu motherboards problems

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It is worth it to buy the fast CPU

news.ycombinator.com Unknown 2025-10-28 11:03:15

In the past few years, CPUs have gotten really fast. Shockingly fast! Yet most people are stuck on previous generation mobile chips (whether by choice, or by their companies choice), at a huge detriment to their productivity. Meanwhile, AI coding subscriptions like Cursor are all the rage these days. I'll skip the debate on exactly how useful these tools are, and focus on the pricing. Cursor is $480/year for the team plan (the cheapest corporate plan), and other providers are around the same, s

Topics: 3x buy cpu cpus end

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Acronis True Image costs performance when not used

news.ycombinator.com View All Posts Brucedawson 2025-10-25 07:00:14

Over two years ago I installed Acronis True Image for Crucial in order to migrate my data to a new SSD I had just purchased. It worked. I then left True Image installed “just in case”, and what harm could that possibly cause. Well, funny you should ask. I recently noticed that whenever I plugged or unplugged my external monitor Explorer.exe would consume a lot of CPU time – dozens of seconds of it. It was enough CPU time to make my computer noticeably sluggish until things calmed down which co

Topics: acronis cpu dll exe explorer

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Does MHz Still Matter?

news.ycombinator.com Unknown 2025-10-29 17:47:05

Does MHz still matter? Furkan Sahin Senior Software Engineer To provide VMs of any size, we slice bare metal into smaller VMs, sometimes even 1 vCPU. So, the performance of one fast core matters a lot. We evaluated new servers from Hetzner with AMD EPYC and Ryzen CPUs to add to our fleet. Ryzen is a CPU from AMD’s gaming line-up and it has better single core performance numbers compared to the EPYC which is a standard datacenter CPU. We weren’t sure if Ryzen’s single core edge would show up in

Topics: core cpu performance ryzen single

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Linux Address Space Isolation Revived After Lowering 70% Performance Hit to 13%

news.ycombinator.com Unknown 2025-11-15 08:14:21

Several years ago Google engineers began exploring address space isolation for the Linux kernel and ultimately proposing Linux ASI for better dealing with CPU speculative execution attacks . While the hope was it would better cope with the ever growing list of CPU speculative execution vulnerabilities, the effort was thwarted initially by I/O throughput seeing a 70% performance hit . That level of performance cost was unsustainable. But now that I/O overhead has been reduced to just 13%.Google e

Topics: asi better cpu google linux

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NeoLogic wants to build more energy-efficient CPUs for AI data centers

techcrunch.com Rebecca Szkutak 2025-11-18 03:00:00

When NeoLogic started building its more energy-efficient CPUs for AI servers, folks in the industry told its founders Avi Messica and Ziv Leshem that their idea wasn’t viable. “Most of the people that we have met say it’s impossible,” Messica told TechCrunch. “Some of them told us, at the time, that the innovation is impossible because you cannot innovate in logic synthesis. You can’t innovate in circuit design. It’s too mature.” Israel-based NeoLogic nevertheless set out to prove them wrong,

Topics: cpus disrupt messica neologic years

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Operation Costs in CPU Clock Cycles (2016)

news.ycombinator.com No Bugs 2025-11-23 11:55:30

Author: “No Bugs” Hare Follow: Job Title: Sarcastic Architect Hobbies: Thinking Aloud, Arguing with Managers, Annoying HRs, Calling a Spade a Spade, Keeping Tongue in Cheek UPDATED: TLB and CAS/atomics (including different NUMA node) added Click to enlarge NB: scale is logarithmic! Premature Pessimization Easy on yourself, easy on the code: All other things being equal, notably code complexity and readability, certain efficient design patterns and coding idioms should just flow naturally

Topics: cost costs cpu cycles memory

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7 Red Flags When Choosing Cheap PC Components

techspot.com Amir Shoam 2025-12-07 05:08:00

With rising graphics card prices, you may want to save on other components when building a gaming PC. If you've read our CPU reviews, which compare current processors using high-quality motherboards, memory and PSUs, you may come to the conclusion that only the graphics card matters when playing at appropriate resolutions, and that the best-value PC is one built with the cheapest modern components elsewhere. That couldn't be further from the truth. While the GPU is the most important component

Topics: core cpu games graphics psu

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7 Red Flags When Choosing Cheap PC Components

techspot.com Amir Shoam 2025-12-07 05:08:00

With rising graphics card prices, you may want to save on other components when building a gaming PC. If you've read our CPU reviews, which compare current processors using high-quality motherboards, memory and PSUs, you may come to the conclusion that only the graphics card matters when playing at appropriate resolutions, and that the best-value PC is one built with the cheapest modern components elsewhere. That couldn't be further from the truth. While the GPU is the most important component

Topics: core cpu games graphics psu

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This Old SGI: notes and memoirs on the Silicon Graphics 4D series (1996)

news.ycombinator.com Unknown 2025-12-07 06:04:05

This Old SGI Consisting of a collection of notes and memoirs on my experiences with the 4D series machines. Compiled and maintained by A. J. Corda (Email) copyright (c) 1996 Version 2.0 Visitor Number Introduction I am posting this assortment of notes and observations as a kind of "thank you" to the numerous people who have replied to my posts in the past. The free flow of information is the life-blood of the internet community, and this is my feeble attempt to maintain that flow, while at

Topics: 4d cpu graphics memory series

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Microsoft is revamping Windows 11’s Task Manager so its numbers make more sense

arstechnica.com Unknown 2025-12-17 08:18:03

Microsoft devotes most of its time and energy these days to promoting new AI- and Copilot-related features for Windows 11, but the company's Windows Insider builds are still full of small tweaks and changes aimed at improving longstanding Windows features for people who just want to use their PC the way they always have. New updates that began rolling out to testers in the Windows Insider program yesterday include a couple of small but meaningful changes for Windows power users. First, Microsof

Topics: cpu different microsoft usage windows

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Zalman's jet engine-inspired CPU cooler is now available

techspot.com Daniel Sims 2025-12-18 15:39:00

Serving tech enthusiasts for over 25 years.TechSpot means tech analysis and advice you can trust WTF?! Electronics with loud fans are often compared to jet engines, but Zalman deliberately designed its newest CPU cooler to resemble one. The Zet 5 is the latest in a series of flamboyant designs introduced this year. For some PC builders, fluorescent lighting is no longer enough. Zalman's Zet 5 CPU cooler, initially showcased at Computex, is now available with a jet engine-style design for users

Topics: available cooler cpu lga zet

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Nvidia N1X AI PC chip leaks with the same number of CUDA cores as an RTX 5070

techspot.com Kishalaya Kundu 2025-12-19 17:02:00

The big picture: Nvidia has long been developing an AI PC processor that combines Arm CPU cores with Blackwell GPU architecture. The chip has now appeared on the Geekbench database for at least the second time, revealing key hardware details and performance metrics. The Nvidia N1X AI PC processor achieved an impressive OpenCL score of 46,361, outperforming all integrated GPUs from Intel, AMD, Qualcomm, and other leading chipmakers. According to the Geekbench listing, it features 48 Streaming Mu

Topics: 5070 clock core cpu n1x

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NixOS on a Tuxedo InfinityBook Pro 14 Gen9 AMD Laptop

news.ycombinator.com Unknown 2025-12-15 12:35:04

I link to TUXEDO a lot in this blog post. These links are not affiliate links, and this post is not sponsored (duh). TUXEDO Computers is a laptop manufacturer based in Augsburg, Germany, who are special to Linux users because they’re one of the few manufacturers developing specifically for Linux. They ship with their own TUXEDO OS, which comes with KDE Plasma by default. For my new job, I actually wanted a Framework laptop with an AMD chip, but they were temporarily out of stock so I opted for

Topics: center control cpu plasma tuxedo

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Rust running on every GPU

news.ycombinator.com Christian Legnitto 2025-12-20 16:08:09

I've built a demo of a single shared Rust codebase that runs on every major GPU platform: CUDA for NVIDIA GPUs for NVIDIA GPUs SPIR-V for Vulkan-compatible GPUs from AMD, Intel, NVIDIA, and Android devices for Vulkan-compatible GPUs from AMD, Intel, NVIDIA, and Android devices Metal for Apple devices for Apple devices DirectX 12 for Windows for Windows WebGPU for browsers for browsers CPU fallback for non-GPU systems The same compute logic runs on all targets, written entirely in regular

Topics: code cpu gpu rust self

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Rust on Every GPU

news.ycombinator.com Christian Legnitto 2025-12-20 22:08:09

I've built a demo of a single shared Rust codebase that runs on every major GPU platform: CUDA for NVIDIA GPUs for NVIDIA GPUs SPIR-V for Vulkan-compatible GPUs from AMD, Intel, NVIDIA, and Android devices for Vulkan-compatible GPUs from AMD, Intel, NVIDIA, and Android devices Metal for Apple devices for Apple devices DirectX 12 for Windows for Windows WebGPU for browsers for browsers CPU fallback for non-GPU systems The same compute logic runs on all targets, written entirely in regular

Topics: code cpu gpu rust self

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Intel May Be Prepping a Massive Apology to Gamers

gizmodo.com Kyle Barr 2025-12-22 10:50:02

If the rumors are to be believed, Intel may be gearing up for a major apology to gamers in the form of a suite of gaming-specific CPUs. Intel has suffered through multiple crises, a CEO ouster, sweeping layoffs, and a dour outlook on the future of the once-massive chipmaker. To make its case to consumers, Intel needs goodwill, and who better to get it from than the outspoken gamer crowd? Multiple semi-reliable leakers have come out of the woodwork to talk about Intel’s plans to copy what makes

Topics: cache chips cpus gaming intel

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Intel May be Prepping a Massive Apology to Gamers

gizmodo.com Kyle Barr 2025-12-22 22:50:02

If the rumors are to be believed, Intel may be gearing up for a major apology to gamers in the form of a suite of gaming-specific CPUs. Intel has suffered through multiple crises, a CEO ouster, sweeping layoffs, and a dour outlook on the future of the once-massive chipmaker. To make its case to consumers, Intel needs goodwill, and who better to get it from than the outspoken gamer crowd? Multiple semi-reliable leakers have come out of the woodwork to talk about Intel’s plans to copy what makes

Topics: cache chips cpus gaming intel

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MIPS – The hyperactive history and legacy of the pioneering RISC architecture

news.ycombinator.com Unknown 2026-01-02 08:31:20

Readers may have noticed a famous and distinguished name in computer architecture in the news recently: GlobalFoundries to Acquire MIPS to Accelerate AI and Compute Capabilities July 8, 2025 GlobalFoundries (Nasdaq: GFS) (GF) today announced a definitive agreement to acquire MIPS, a leading supplier of AI and processor IP. “MIPS brings a strong heritage of delivering efficient, scalable compute IP tailored for performance-critical applications, which strategically aligns with the evolving deman

Topics: 64 architecture cpu mips nintendo

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Android is about to take another AI leap over Apple

androidauthority.com Unknown 2026-01-22 03:01:06

Rushil Agrawal / Android Authority TL;DR Future Android processors will support SME2 for faster machine learning running directly on the CPU. The improvements look set to appear with Arm’s upcoming mobile CPU core. Developers using Arm’s KleidiAI won’t have to change anything to benefit. Despite its naysayers, AI features remain the cornerstone of modern smartphone innovation. But powering the latest and greatest AI tools quickly and efficiently requires processors that are up to the task,

Topics: android arm cpu sme sme2

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Understand CPU Branch Instructions Better

news.ycombinator.com Chris Feilbach 2026-01-19 04:34:04

Branch instructions are the primary means by which a program running on a CPU makes a decision. This post is part of a series of posts on CPU performance, as part of the Pointer Wars: Linked List Edition challenge. This challenge is great for undergraduates, graduate students, and new engineers who want feedback about writing high performance C or C++ code. Much more info here. The Sequential Execution Model and Branch Instructions Programs written to execute on a CPU follow something called

Topics: branch branches cpu instruction instructions

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Latest Tech News

Java 25's new CPU-Time Profiler

Java 25's new CPU-Time Profiler (1)

Weird CPU architectures, the MOV only CPU (2020)

CPU Utilization is Wrong (2017)

I am giving up on Intel and have bought an AMD Ryzen 9950X3D

%CPU utilization is a lie

The No-CPU Amiga Demo Challenge

Like Intel before it, AMD blames motherboard makers for burnt-out CPUs

GMP damaging Zen 5 CPUs?

Like Intel before it, AMD blames motherboard makers for burnt-out CPUs

It is worth it to buy the fast CPU

Acronis True Image costs performance when not used

Does MHz Still Matter?

Linux Address Space Isolation Revived After Lowering 70% Performance Hit to 13%

NeoLogic wants to build more energy-efficient CPUs for AI data centers

Operation Costs in CPU Clock Cycles (2016)

7 Red Flags When Choosing Cheap PC Components

7 Red Flags When Choosing Cheap PC Components

This Old SGI: notes and memoirs on the Silicon Graphics 4D series (1996)

Microsoft is revamping Windows 11’s Task Manager so its numbers make more sense

Zalman's jet engine-inspired CPU cooler is now available

Nvidia N1X AI PC chip leaks with the same number of CUDA cores as an RTX 5070

NixOS on a Tuxedo InfinityBook Pro 14 Gen9 AMD Laptop

Rust running on every GPU

Rust on Every GPU

Intel May Be Prepping a Massive Apology to Gamers

Intel May be Prepping a Massive Apology to Gamers

MIPS – The hyperactive history and legacy of the pioneering RISC architecture

Android is about to take another AI leap over Apple

Understand CPU Branch Instructions Better

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