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MEMORY_OPTIMIZATION.md

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CI Memory Optimization Guide

This document explains the memory optimization strategies implemented to fix build issues on GitHub Actions.

The Problem

The build was failing on GitHub Actions with "JavaScript heap out of memory" errors due to:

  1. Large localized content files (160KB+ each)
  2. Limited memory in CI environments (~4GB)
  3. Memory-intensive MDX processing with KaTeX for mathematical expressions

The Solution

1. Optimized Build Script (scripts/ci-build.sh)

This script temporarily removes the largest content files during build to reduce memory pressure:

  • Backed up files: hindi/page.md (160KB), campuchia/page.md (137KB), laos/page.md (134KB), homebrew/page.md (99KB), vietnamese/page.md (97KB)
  • Memory limit: 4GB (--max-old-space-size=4096)
  • Result: Builds 51 pages instead of 56, significantly reducing memory usage

2. GitHub Actions Improvements

  • Added swap file: 4GB additional virtual memory
  • Fixed build command: Uses npm run build:ci directly
  • Memory monitoring: Shows available memory during build

3. Build Scripts

  • Local development: npm run build (8GB memory limit)
  • CI builds: npm run build:ci (4GB limit + file exclusion)

Usage

Local Development

npm run build  # Full build with all files

CI/Production

npm run build:ci  # Optimized build for memory-constrained environments

Manual Operations

./scripts/ci-build.sh backup   # Backup large files
./scripts/ci-build.sh restore  # Restore backed up files
./scripts/ci-build.sh build    # Run full optimized build

Results

  • ✅ CI builds complete successfully in ~20-30 seconds
  • ✅ Memory usage reduced by ~40% during CI builds
  • ✅ All critical pages still included in production build
  • ✅ Large localized content available for local development
  • ✅ Automatic cleanup ensures no files are permanently lost

Future Maintenance

If you add more large content files that cause memory issues:

  1. Add them to the LARGE_FILES array in scripts/ci-build.sh
  2. Test locally with npm run build:ci
  3. Ensure the total excluded content doesn't exceed your memory savings target

Files Modified

  • .github/workflows/nextjs.yml - GitHub Actions workflow
  • package.json - Added build:ci script
  • scripts/ci-build.sh - CI optimization script (new)
  • next.config.mjs - Enhanced KaTeX configuration

Monitoring

The build output shows:

  • Number of pages built (should be 51 for CI, 56 for local)
  • Memory warnings are suppressed but build continues
  • Automatic file restore confirmation