What 100DaysOfJava changed in how I investigate systems
This challenge started as a way to learn more Java. Over time, it became a way to follow confusion down to memory, coordination, performance, and failure modes.
Mohibul Hassan Chowdhury · Software engineer & writer
I build backend systems and explain how they behave.
I work across Java, distributed systems, and production AI. My writing follows concrete questions through code, measurements, and the occasional wrong assumption.
From the notebook
Recent writing
Virtual threads and event loops solve different problems
A measured comparison of virtual threads and event loops, with a public benchmark suite and guidance for testing each model against a real workload.
Why parallel file processing left CPU cores idle
Why one parallel file-processing run left CPU cores idle, how a fixed-batch Spliterator changed the result, and why the finding is tied to its runtime and workload.
Day 98: I Thought Virtual Threads Were Just Green Threads They're Actually Continuations on the Heap
I thought virtual threads were just green threads—turns out they’re continuations on the heap with sophisticated scheduling. Here’s what I got wrong and what actually happens under the hood.
Day 97: Java Concurrency Toolkit Part 3 - Advanced Patterns & Production Readiness
Part 3: Advanced Patterns & Production Readiness - Deep dive into 3 advanced tools plus debugging, monitoring, and going to production