Having 12+ Years of Experience in Software Development
Diagnosing EventMachine Reactor Stalls Under Load When an EventMachine-based Ruby application experiences reactor stalls under peak traffic on a Linode instance, the root cause is almost invariably a synchronous I/O operation blocking the event loop. EventMachine, by design, relies on a single-threaded, non-blocking I/O model. Any operation that ties up the CPU or waits for […]
Identifying Slow LCP Due to Database Bottlenecks Largest Contentful Paint (LCP) is a critical user experience metric. When LCP is slow, especially on AWS-hosted applications, the database is often a prime suspect. This post details a systematic approach to diagnosing and resolving LCP degradation caused by unoptimized database queries, focusing on common AWS infrastructure components. […]
Understanding the Linux OOM Killer The Out-Of-Memory (OOM) Killer is a crucial component of the Linux kernel designed to prevent a system from crashing entirely when it runs out of available memory. When the kernel detects a severe memory shortage, it invokes the OOM Killer to select and terminate one or more processes. This action […]
Understanding PHP-FPM Memory Management PHP-FPM (FastCGI Process Manager) is a popular alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busy ones. A common challenge in production environments, particularly on resource-constrained cloud instances like those on Google Cloud Platform (GCP), is managing and diagnosing memory consumption. Uncontrolled memory usage […]
Identifying Slow Database Queries Impacting LCP The Largest Contentful Paint (LCP) metric is a critical indicator of perceived loading speed. When LCP is slow, it often points to bottlenecks in how quickly the main content element can be rendered. In modern Shopify applications, especially those with custom themes, complex apps, or heavy data retrieval, unoptimized […]
Diagnosing Socket Timeout and Protocol Parse Failures in Legacy Batch Scripts Under High Load When legacy batch scripts, often critical for data ingestion or processing, begin to fail with socket timeouts and protocol parse errors during peak event traffic on AWS, it’s a clear indicator of resource contention or network path degradation. These issues are […]
Root Cause Analysis: Redis Connection Exhaustion During Peak Load The recurring `Uncaught Redis ConnectionException` errors, particularly during high-traffic events on OVH infrastructure, point to a critical bottleneck: Redis connection pool exhaustion. This isn’t a transient network glitch; it’s a systemic failure to provision and manage Redis connections adequately under stress. When your API services, typically […]
Identifying the Root Cause: Synchronous I/O in EventMachine EventMachine is a popular Ruby library for building asynchronous, I/O-bound applications. Its core strength lies in its non-blocking event loop, which allows a single thread to manage thousands of concurrent connections efficiently. However, this efficiency is critically undermined when synchronous I/O operations are introduced into the event […]
Identifying the Bottleneck: CPU Throttling Under Load When a critical Perl script, responsible for processing high-volume event traffic on AWS, begins exhibiting high CPU utilization and subsequent throttling, the immediate concern is pinpointing the root cause. This isn’t a theoretical exercise; it’s a production emergency. The symptoms often manifest as increased latency, dropped events, and […]
Identifying Checkout Session Locking Bottlenecks on DigitalOcean Flash sales are a critical revenue driver for e-commerce platforms, but they also expose latent performance issues. A common bottleneck during high-traffic events is checkout session locking. This occurs when multiple requests to the same session resource contend for exclusive access, leading to timeouts, abandoned carts, and lost […]