teleren/devto huggingface dataset:
Understanding the JVM optimization (JIT)
Tags: java, jvm, code, spring
Published: 2024-05-27 23:14:33



![JVM scheme](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/bvc23oc15q9dx764g1qg.jpg)Java is widely regarded as an interpreted language, primarily relying on the Java Virtual Machine (JVM) to convert the code we write into machine code. This process allows Java to uphold its renowned principle of "write once, run anywhere," ensuring platform independence. However, the performance of interpreted languages can lag behind that of natively compiled machine code.

To bridge this performance gap, the JVM employs sophisticated techniques to optimize code execution, making Java applications run faster. One of the key mechanisms it uses is Just-In-Time (JIT) compilation. During execution, the JVM identifies frequently executed parts of the code, compiles them into native machine code, and optimizes them for better performance.

**JVM Compilers: C1 and C2**
The JVM uses two main compilers, each designed to handle different levels of optimization: C1 and C2.

**C1 Compiler**:
The C1 compiler, also known as the client compiler, handles initial stages of optimization with two primary levels:

**Level 1**: At this stage, the JVM simply interprets the bytecode. This is the least optimized level and is used for initial execution when the JVM doesn't yet have enough profiling information.

**Level 2**: The code is compiled into machine code without any further optimization. This level is quicker than the more advanced levels but provides a foundation for performance improvements as the application continues to run.

**C2 Compiler**:
The C2 compiler, or server compiler, takes optimization to a more advanced level:

**Level 3**: Here, the JVM compiles code into highly optimized native machine code. Although this process takes longer than Level 2, it significantly enhances execution speed. This level of optimization is typically applied to methods and loops that are executed very frequently, making it unlikely to be used in short-lived applications.
The Role of Caching in JVM Optimization
Once the code is compiled and optimized, it is stored in a cache to speed up future executions. This caching mechanism ensures that the JVM does not need to recompile code segments repeatedly. However, since the cache has limited capacity, it periodically needs to be cleared to accommodate new compilations. This process ensures efficient use of memory and maintains optimal performance.

**Beyond Compilation: Next Steps**
Understanding the JVM's compilation and optimization mechanisms provides a solid foundation for grasping Java's performance capabilities. In subsequent sections, we will delve into other crucial aspects of Java performance, such as the differences between the stack and heap memory, and the concept of passing values by reference versus passing by value. These topics are essential for mastering Java performance tuning and writing efficient Java code.

Stay tuned as we explore these advanced topics and continue to demystify the inner workings of the JVM.
help with apps script
Tags: beginners, javascript, googlecloud, explainlikeimfive
Published: 2024-05-27 22:45:08

I am trying to learn java script for google apps script to have a spreadsheet I can use for theater costume plots.  Basically, I want the spreadsheet to generate sheets for different sorts, but then keep them updated with edits to the parent. I have an on Edit script to make a new sheet when an actor's name is entered, but I can't get it to link to the new sheet. It also does not sync with changes.
Structural-Based Testing: A Simple Guide
Tags: java, tutorial, programming, softwaredevelopment
Published: 2024-05-27 22:44:06

When writing tests for your code, it's easy to miss some parts, which can lead to bugs. How can you ensure you've tested everything properly?

Use structural-based testing!

## What is Structural-based testing?

This technique is about considering your code when writing your tests.

It's a complementary technique and should be used as a support of other testing techniques.

The idea here is that you already have a test suite and you want to check if all branches and partitions of your code were already tested.

This can be achieved by looking at the line coverage report.

It will spot places that might be missing some test scenarios.

But do not use this to write tests right away. Use it to understand what’s going on first.

As I said it is a complementary technique that should be used to help you fill the gaps that your tests can be missing.

Use as a part of the process.

## So what process is this?

1. [**Specification-based testing**:](https://dev.to/tiuwill/specification-based-testing-a-developers-secret-weapont-3c5p) this will help you to create scenarios that match the specification expectations.
2. [**Use coverage as a guide, not a goal**:](https://dev.to/tiuwill/use-coverage-as-a-guide-not-a-goal-4925) Run your coverage tool to see if some branches or partitions are missing.
3. **Understand the results**: question yourself to get clarification, this will be a filter to write the missing tests later. Example:
    - Why this part was not covered by the test suite?
    - How this partition can be exercised?
    - Could this be missing from the specification?
    - Or just was an update?
    - Did someone just forget to write a test considering this branch?
    - Is the developer checking something that does not make sense at this moment?
4. **Create test scenarios**: Write tests for what makes sense to fill the gaps of what went missing. For what it doesn't maybe you should refactor.

## Additional tips:

[**Write meaningful assertions**](https://dev.to/tiuwill/how-to-write-meaningful-test-assertions-that-help-you-not-break-your-code-base-ohh): it’s tempting to write tests that just pass through the code without testing anything, this will help you avoid this mistake. Some tests can fool the coverage metric, so make sure that are testing something.

[**Run mutation tests**:](https://dev.to/tiuwill/from-bugs-to-brilliance-enhancing-code-reliability-through-mutation-testing-15gc) by writing tests and looking at the code is easy to fool yourself and think that everything is ok because it’s covering all parts of your code. Mutation tests will put that into proof and help you to see what tests need some rework to improve their strength to catch bugs.

So next time you are going to create tests by looking at your code, following this process, will help you a lot!

For more tips, follow me on social media!

[Willian Moya (@WillianFMoya) / X (twitter.com)](https://twitter.com/WillianFMoya)

[Willian Ferreira Moya | LinkedIn](https://www.linkedin.com/in/willianmoya/)

Also follow me here on dev.to!
Systemd
Published: 2024-05-27 22:43:12

Systemd, Linux işletim sistemleri için bir başlatma sistemi ve hizmet yöneticisidir. Geleneksel SysVinit sistemini değiştirmek üzere tasarlanmıştır ve paralel sistem hizmetlerinin başlatılması, gerektiğinde servislerin başlatılması ve bağımlılık tabanlı hizmet kontrolü gibi daha fazla özellik sunar. Systemd, sistem başlatma sürelerini iyileştirmeyi hedefler ve sistem süreçlerini ve hizmetlerini daha iyi yönetme imkanı sağlar.

Systemd'in önemli özelliklerinden biri, hizmetler, soketler, aygıtlar, bağlantılar ve diğer sistem kaynaklarını tanımlamak için birim dosyalarını kullanmasıdır. Bu birim dosyaları basit bir deklaratif dilde yazılmıştır ve her bir birimin yapılandırmasını ve bağımlılıklarını belirtmek için kullanılır.

Systemd ayrıca sistem hizmetlerini yönetmek için systemctl gibi yardımcı programlar içerir, servisleri kontrol etmek için journalctl gibi sistem günlüklerine erişmek için ve sistem başlatma sürelerini analiz etmek için systemd-analyze gibi yardımcı programlar bulunur.

Genel olarak, systemd birçok Linux dağıtımında varsayılan başlatma sistemi haline gelmiştir, bunlar arasında Debian, Ubuntu, Fedora, CentOS ve diğerleri bulunmaktadır. Ancak, systemd'in algılanan karmaşıklığı ve geleneksel Unix prensiplerinden sapması nedeniyle Linux topluluğu içinde tartışmalı bir kabul görmüştür.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/2170aumann6oi0prodcw.png)

**Systemd'in Özellikleri:**

- **Daha hızlı başlatma:** Systemd, paralel işleme ve soket ve D-Bus etkinleştirme gibi özellikler kullanarak işletim sisteminin daha hızlı başlatılmasını sağlar.

- **Gelişmiş servis yönetimi:** Systemd, servislerin bağımlılıklarını ve başlatma sırasını yönetmek için daha karmaşık bir sistem kullanır. Bu, sistemin daha kararlı ve güvenilir çalışmasını sağlar.Gelişmiş servis yönetimi: Systemd, servislerin bağımlılıklarını ve başlatma sırasını yönetmek için daha karmaşık bir sistem kullanır. Bu, sistemin daha kararlı ve güvenilir çalışmasını sağlar.

- **Daha iyi hata ayıklama:** Systemd, daha ayrıntılı hata ayıklama bilgileri sağlar. Bu, sorunları daha hızlı bulup çözmenizi kolaylaştırır.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/f8k45y7zj9z99227wqfm.jpg)

**Systemd Örneği**
Aşağıdaki örnek, systemd kullanarak bir servis nasıl başlatılır ve durdurulurunu gösterir:

**_Servisi başlat_**
sudo systemctl start my-service

**_Servisi durdur_**
sudo systemctl stop my-service

**_Servisin durumunu kontrol et_**
sudo systemctl status my-service
                   


      
                           **  SORULAR**

_**1. Systemd dosyaları nelerdir?**_





_**2. Systemd komutları nelerdir?**_



_**3. Systemd, Linux işletim sistemlerinde kullanılan ____'dir.**_



**_4. Systemd servis birimler ____ .service dosyaları olarak oluşturulur._**




 



                           **KAYNAKÇA**
_https://chatgpt.com/?oai-dm=1_
_https://gemini.google.com/app/0abc9ab5ad85e18f_
_https://gemini.google.com/app/0abc9ab5ad85e18f_
JOTAI(GLOBAL STATE MANGEMENT)
Tags: webdev, javascript, react, zustandjotai
Published: 2024-05-27 21:53:52

Hey? REACT developers, are you tired of managing the global states on the client side and bored with using the useContext hook to pass the state?
Here is an optimal alternative of this to manage the global state on the client side.
**Introduction:**
Jotai takes an atomic approach to global React state management.

Build state by combining atoms and renders are automatically optimized based on atom dependency. This solves the extra re-render issue of React context, eliminates the need for memoization, and provides a similar developer experience to signals while maintaining a declarative programming model.

**Example**
**First, create a primitive atom**
An atom represents a piece of state. All you need is to specify an initial value, which can be primitive values like strings and numbers, objects, and arrays. You can create as many primitive atoms as you want.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/sr6l0vr2vbs3q86egqwc.png)

**Use the atom in your components**
It can be used like React.useState:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/rkfzo4f0hxvgo5mtc1yz.png)

for more details: https://jotai.org/
¿Qué esta pasando con Gemini AI de Google?
Tags: ai, gemini, machinelearning, google
Published: 2024-05-27 21:38:39

Desde diciembre de 2023, hemos visto el cambio de Bard a Gemini, la nueva generación de inteligencia artificial de Google, ¡y ha sido un cambio para bien!

En el reciente Google I/O nos sorprendieron con una cantidad generosa de actualizaciones. Les presento:

**Gemini 1.5 Flash:** ¿Necesitas respuestas rápidas para tareas repetitivas? Este modelo optimiza el tiempo de procesamiento, además de ser más económico. No creas que por ser más rápido soporta menos tokens; tiene la increíble capacidad de manejar un contexto de ¡1 millón de tokens!

**Gemini 1.5 Pro:** El jefe de las tareas complejas.
Este modelo viene cargado de mejoras significativas en traducción, manejo de código y razonamiento. Su fuerte está en la capacidad de trabajar tareas más complejas. Su capacidad actual es de 1 millón de tokens, pero para Google eso no es suficiente: ahora podrá manejar ¡2 millones de tokens! Para que te hagas una idea de cuánto representa esto, se puede traducir a:
- 2 horas de video
- 22 horas de audio
- +60 mil líneas de código
- +1.4 millones de palabras

![Comparación de modelos y gemini con su procesamiento de 2 millones de tokens](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/j6jnrjia6mdvumv8q1fs.png)

**¿Cómo saber cuál utilizar?**
- Si necesitas procesar mucha información y respuestas más detalladas utiliza Gemini 1.5 Pro.
- Si necesitas velocidad y respuestas más rápidas utiliza Gemini 1.5 Flash.

**Google también anunció estas características:**

- Multimodalidad: Gemini ahora puede procesar información de múltiples fuentes simultáneamente: texto, imágenes, audio y video.
- Gemma se expande: ¡El nuevo modelo PaliGemma!
Gemma es una lista de modelos open source de Google, y se une PaliGemma, que se especializa en la identificación, descripción visual y comprensión de imágenes.

**¿Quieres probar Gemini?**

[¡Es gratis!](https://ai.google.dev/pricing)

Puedes intentarlo en Google AI Studio y experimentar con su API de Gemini de forma gratuita (sujeto a disponibilidad por región). Te aseguro que te impresionará la velocidad y capacidad de procesamiento de esta nueva generación de IA.

Déjame en los comentarios qué piensas sobre estas actualizaciones.
Pro Edge Services and Training, Inc.
Published: 2024-05-27 21:33:56



![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5x0otat38wfk1xz52h4l.png)


Pro Edge Services and Training, Inc. is your trusted local HVACR expert in Oakdale, CA, serving Modesto and the surrounding areas. For over ten years, we've been committed to providing top-quality HVAC repair, maintenance, and installation services at fair and reasonable prices. Whether you need residential or commercial HVAC solutions, our experienced team is dedicated to ensuring optimal comfort and efficiency in your home or business. At Pro Edge Services and Training, Inc., we value long-lasting customer relationships and look forward to welcoming new clients. Contact us today to experience exceptional service tailored to your needs.

Pro Edge Services and Training, Inc.
Address: [657 Armstrong Way Office Suite D, Oakdale, CA 95361](https://www.google.com/maps?cid=9152766348593560696)
Phone: 209-425-3880
Website: [https://www.proedge-services.com](https://www.proedge-services.com)
Contact email: chuck@proedge-services.com

Visit Us:
[Pro Edge Services and Training, Inc. Facebook](https://www.facebook.com/ProEdgeServicesAndTraining/)
`[Pro Edge Services and Training, Inc. Instagram](https://www.instagram.com/pro.edge.services_hvac/)
[Pro Edge Services and Training, Inc. Yelp](https://www.yelp.com/biz/pro-edge-services-and-training-waterford)

Our Services: 
Commercial / Industrial Refrigeration & HVAC Services
Residential HVAC and Appliance Services
Temp Alert Services
ABOUT ME
Published: 2024-05-27 21:33:22

I'm Subhasis Tripathy, a Pre Final Year Student of GIET University with 2 years of experience in creating dynamic and user-friendly websites. My passion lies in expanding my knowledge in Python web development and cloud hosting. I'm dedicated to honing my expertise in the cloud field and exploring innovative solutions. I have been an active part of GDSC under the domain of CLoud as cloud’s Co-Lead. I have profound knowledge in the fields of Cloud Technology, IOT and Web development. I have essential skills in the programming Languages like C,Java,Python.I have other fundamental skills like communicational skills,Public speaking skills and Leadership qualities.I have an aim to Become a DevOps Engineer.
The fastest local database ever!!!!
Tags: database, javascript, typescript, npm
Published: 2024-05-27 21:13:24

verse.db isn't just a database, it's your universal data bridge. Designed for unmatched flexibility, security, and performance, verse.db empowers you to manage your data with ease.

## Introduction to verse.db

**Welcome to verse.db!** Allow us to introduce you to the universe of verse.db, a powerful database solution. Whether you're building applications, conducting research, or organizing information, verse.db offers a versatile set of tools to streamline your data-related tasks.

Here are some key features of verse.db:

### Local and Online Database:
   - verse.db provides both local and online database options, allowing you to choose the setup that best suits your needs.
   - Use it as a local database for offline applications or connect to an online server for real-time data access.

### Adapter Flexibility:
   - We offer multiple adapters to cater to different use cases.
   - For example, you can use the JSON adapter to store data in JSON format or explore other adapters like YAML and SQL.

### Efficient Data Management:
   - verse.db optimizes data handling, ensuring efficient retrieval, storage, and manipulation.
   - Whether you're storing user profiles, game scores, or scientific data, verse.db has you covered.

> Note*: the online is still under development

{% embed https://versedb.jedi-studio.com %}
My Movie Website
Published: 2024-05-27 20:53:07

This app is about making movies, the reason why I made this app is because we all like
movies, We all have a favorite movie. The way way this app works is that the you type 
in the movie you like, in the search bar after you have typed in the name of the movie.You click on the add movie and the movie is on the list. My Favorite Movie is 21 Jump Street, this movie is about two guys that are under cover cops, dress as
teenagers and their job is to arrest kids that are selling this narcotic that is 
killing students. These two Cops were played by Jonah Hill and Channing Tatum.
When these two were kids in high school Channing tatum was popular and Jonah
Hill was not popular at all, So now that they are both adults they are going
to be under cover cops, but now the roles were reversed Jonah was popular and
Channing was not popular, they both saw each others perspective, however 
Jonah was having a really good time. As the movie was going on both of them
were not finding any breaks in the case so their supervisor was telling
them that if they don't close this case soon. They won't be able to be
undercover cops anymore, so they both learned that one of the popular kids
and one of the teachers were the one selling the drugs to the students. That
they bought from a moter cycle gang, they had a shoot out with the gang and they apprehended the gang and the student and teacher. Because they were able to close this
case.
Keml: Empowering UI Development, One Developer at a Time
Published: 2024-05-27 20:41:31

Hey Fellow Developers,

I'm thrilled to introduce you to Keml – a small yet mighty alternative to HTMX that's poised to change the game in UI development. And the best part? It's crafted and maintained by just one person (that's me!).

Here's why Keml deserves a spot in your toolkit:

### 1. Versatile Integration, Zero Hassle 🛠️

With Keml, you're not tied down to a specific server-side stack. Whether you're rocking Node.js, PHP, Java, Python, or C#, Keml plays nice with them all. And guess what? Your server doesn't even need to know it's rendering Keml syntax – it's just standard HTML with a dash of extra custom attributes. Seamless integration, zero headaches.

### 2. Simplify UI Building with HTML-Extended Syntax 🏗️

Say goodbye to cumbersome JavaScript coding! Keml's magic lies in its extended HTML syntax, designed to make UI development a breeze. Build highly interactive user interfaces directly within your HTML markup, no complicated scripts required.

### 3. Performance, Flexibility, Simplicity – All in One 🚀

Keml isn't just about features; it's about delivering lightning-fast user experiences without the complexity. Think of it as your trusty sidekick, prioritizing performance, flexibility, and above all, simplicity. And since it's a one-person endeavor, your feedback and contributions carry extra weight in shaping Keml's future.

### 4. Early Stage Development, Honest Disclaimer 🚧

Let's keep it real – Keml is still in its early stages of development. Bugs might pop up here and there, but with your help, we'll squash them in no time. Your input matters more than ever as we refine Keml and pave the way for smoother UI development.

### 5. Dive into Keml Today 🎨

Ready to experience Keml firsthand? It's as easy as:

```html
<!-- "install" the library -->
<script src="https://unpkg.com/keml"></script>

<!-- initiate an action -->
<button on:click="updateCounter">
  Click me!
</button>

<!-- send a post request on action -->
<div
  on="updateCounter"
  post="/increment"
  result="counterValue"
></div>

<!-- render responses -->
<p>
  Here we have the value of counter:
  <span render="counterValue"></span>.
  And here it is again, but smaller:
  <small render="counterValue"></small> ;)
</p>
```

Join me on this journey to simplify UI development, one line of code at a time. Have questions, feedback, or just want to say hi? Connect with me on GitHub. I'm all ears!

Embrace simplicity with Keml – your partner in effortless UI magic! ✨

This article was written with the help of ChatGPT. But, after reading and re-reading it a few dozen times, I realize that it perfectly and concisely formulates my own thoughts better than I, probably, ever could by myself without a great number of revisions and tweaks.

Cheers,
https://github.com/thealjey/keml
Recursos para Design com estilo "brasileiro" - de Cordel
Tags: braziliandevs, frontend, webdev, design
Published: 2024-05-27 20:34:50

Boa tarde, galera linda.

No momento, estou trabalhando no site de um projeto artístico que segue as gravuras de corde, então seria ótimo encontrar algo assim para usar no design do site (eu sou freelancer e solo).

Vim perguntar se existe algum tipo de icon pack ou ilustrações pra uso em website no estilo de literatura de cordel ou gravura, ou mesmo que represente um pouquinho mais as culturas brasileiras do que um ícone corporativo genérico, ou se esse tipo de coisa teria que ser comissionado. Também, qualquer tipo de icon pack que vá pra um lado mais artístico que vocês recomendem.

Obrigada!
Profylix
Tags: webdev, beginners, testing, demo
Published: 2024-05-27 20:25:18

Hey everyone,

I'm a 17-year-old developer and I've been working on something cool called Profylix. It's basically a platform where you can create your own awesome profiles to show off who you are, what you're into, and what you've achieved.

Why Profylix?
Customization: Make your profile totally you!
Connection: Share it with others and make new connections.
Visibility: Stand out from the crowd with a profile that's uniquely yours.
I'd love to hear what you think! If you're interested, you can sign up for early access and share your thoughts here: https://shadowgames.ca/profylix

Thanks a bunch for any support and feedback! 🙌