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jalgoarena's Introduction

JAlgoArena Build Status JProfiler

JAlgoArena is a programming contest platform. You can host it on any infrastructure which runs Java & Node.JS.

JAlgoArena is a great alternative to portals like HackerRank and similar - when you are limited to only own infrastructure or you just don't want to pay for external service or help in organizing coding contest for your developers.

Introduction

JAlgoArena allows user to see existing problems, create account and using it submit solutions for existing problems.

  • Every solution is limited by time and memory consumption and needs to pass all defined test cases
  • Problems itself are divided into three difficulty levels for each ones receiving different set of points

UI

  • JAlgoArena is created using Responsive UI based on bootstrap framework.
  • Internally all is done with usage of React components and bootstrap styles.

See more details on JAlgoArena Docs page.

Component Diagram

jalgoarena's People

Contributors

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jalgoarena's Issues

Memory Statistics bug

memory is calculated using:

val runtime = Runtime.getRuntime()

            runtime.totalMemory() - runtime.freeMemory()

And it's kept in Long, which has max value of: 9,223,372,036,854,775,807

As this is bytes, the max number it can hold would be: 9223372 terabytes ๏Š

So the time was gathered during peak down of memory in runtime, which can happen from mainly GC run โ€“ at it can happen in middle there is GC run and memory will go down.

I agree that then, it should not be considered through results of memory, and as there is 6 runs at total, 5 other should be considered being > 0.

Consider using Kafka

  • To make platform running in asynchronous way
  • To use log of kafka - making more parts of JAlgoArena stateless
  • Easier recovery and scalability

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