System Monitoring Commands
Load Average & Uptime uptime # 10:32:01 up 45 days, 2:14, 3 users, load average: 1.25, 0.98, 0.75 The three numbers are load average …
Jan 20, 2026
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Performance
11 articles
High Load Average
Overview Load average is one of the most misunderstood Linux metrics. It’s not a CPU percentage — it’s roughly the average …
Jan 20, 2026
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Slow Disk I/O
Overview Applications feel slow, but CPU and memory both look fine. The bottleneck is often the disk — either the physical/virtual storage …
Jan 20, 2026
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High CPU Usage
Overview CPU pegged at 100% (or a load average far above core count) usually has one of two shapes: a single runaway process, or many …
Jan 20, 2026
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Application Latency Spiked After Migrating EC2 to ECS Fargate
The Problem Latency regressions after migrating to Fargate are almost always caused by networking changes — not application code. Fargate …
Jan 20, 2025
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DynamoDB Hot Partition During a Flash Sale — Diagnose and Fix
The Problem DynamoDB partitions data based on the partition key. If all requests go to items with the same partition key value (like …
Jan 20, 2025
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Optimising a Slow Data Processing Pipeline
Context: A batch job that processes 10 million CSV rows runs for 4 hours. Each row is parsed, validated, transformed, and inserted into a …
Jan 20, 2025
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CPU-Bound Task Blocking the Async Event Loop
Context: Your FastAPI service processes image thumbnails on upload. When a user uploads a large image, the API becomes unresponsive for all …
Jan 20, 2025
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Application Latency Spiked After Migrating EC2 to ECS Fargate
The Problem Latency regressions after migrating to Fargate are almost always caused by networking changes — not application code. Fargate …
Jan 20, 2025
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Slow API Endpoint: N+1 Query Problem
Context: A Django REST API endpoint that lists all users and their order counts is responding in 8 seconds for 500 users. The database has …
Jan 20, 2025
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DynamoDB Hot Partition During a Flash Sale — Diagnose and Fix
The Problem DynamoDB partitions data based on the partition key. If all requests go to items with the same partition key value (like …
Jan 20, 2025
Read more