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#!/bin/bash
# Profile-Based Optimization (PBO) script for dgrep
# This script automates the complete PBO process including baseline testing,
# optimization application, and performance comparison
set -e
# Get the directory where this script is located
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# Get the project root directory (parent of scripts)
PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
# Change to project root to run commands
cd "$PROJECT_ROOT"
# Define paths for all PBO files in scripts directory
PBO_DIR="$SCRIPT_DIR"
TEST_FILE="$PBO_DIR/test_100mb.txt"
BASELINE_CPU_PROF="$PBO_DIR/pbo_baseline_cpu.prof"
BASELINE_MEM_PROF="$PBO_DIR/pbo_baseline_mem.prof"
OPTIMIZED_CPU_PROF="$PBO_DIR/pbo_optimized_cpu.prof"
OPTIMIZED_MEM_PROF="$PBO_DIR/pbo_optimized_mem.prof"
REPORT_FILE="$PBO_DIR/pbo_report.txt"
echo "=== Starting Profile-Based Optimization (PBO) for dgrep ==="
echo "Working directory: $PROJECT_ROOT"
echo "PBO files location: $PBO_DIR"
# 1. Create test file if needed
echo "1. Creating test file if needed..."
if [ ! -f "$TEST_FILE" ]; then
echo "Creating 100MB test file with 1M lines..."
for i in $(seq 1 1000000); do
echo "$i: This is a test line with INFO level logging and some extra content to make it realistic"
done > "$TEST_FILE"
fi
# 2. Run baseline performance test (assumes current state is baseline)
echo "2. Running baseline performance test..."
echo " - Generating CPU profile (baseline)..."
./dgrep --plain -regex "INFO" -files "$TEST_FILE" -cpuprofile "$BASELINE_CPU_PROF" -memprofile "$BASELINE_MEM_PROF" > /dev/null
echo " - Analyzing baseline profiles..."
echo " CPU Profile (baseline):" > "$REPORT_FILE"
go tool pprof -top "$BASELINE_CPU_PROF" | head -10 >> "$REPORT_FILE"
echo " Memory Profile (baseline):" >> "$REPORT_FILE"
go tool pprof -top "$BASELINE_MEM_PROF" | head -10 >> "$REPORT_FILE"
# 3. Run performance benchmark
echo "3. Running performance benchmark (3 iterations)..."
echo " Baseline timings:" >> "$REPORT_FILE"
for i in 1 2 3; do
echo " Iteration $i:"
(time ./dgrep --plain -regex "INFO" -files "$TEST_FILE" > /dev/null) 2>&1 | grep real >> "$REPORT_FILE"
done
# 4. Note optimizations (already implemented in code)
echo "4. PBO optimizations are already implemented in the code"
echo " - Timer allocation reduction (reusable timers)"
echo " - I/O operation optimization (bulk writes, pre-allocated buffers)"
echo " - Memory allocation improvements (buffer pooling)"
# 5. Run optimized performance test
echo "5. Running optimized performance test..."
echo " - Generating CPU profile (optimized)..."
./dgrep --plain -regex "INFO" -files "$TEST_FILE" -cpuprofile "$OPTIMIZED_CPU_PROF" -memprofile "$OPTIMIZED_MEM_PROF" > /dev/null
echo " - Analyzing optimized profiles..."
echo " CPU Profile (optimized):" >> "$REPORT_FILE"
go tool pprof -top "$OPTIMIZED_CPU_PROF" | head -10 >> "$REPORT_FILE"
echo " Memory Profile (optimized):" >> "$REPORT_FILE"
go tool pprof -top "$OPTIMIZED_MEM_PROF" | head -10 >> "$REPORT_FILE"
# 6. Run optimized benchmark
echo "6. Running optimized benchmark (3 iterations)..."
echo " Optimized timings:" >> "$REPORT_FILE"
for i in 1 2 3; do
echo " Iteration $i:"
(time ./dgrep --plain -regex "INFO" -files "$TEST_FILE" > /dev/null) 2>&1 | grep real >> "$REPORT_FILE"
done
# 7. Generate comparison report
echo "7. Generating comparison report..."
echo "=== PROFILE-BASED OPTIMIZATION REPORT ===" >> "$REPORT_FILE"
echo "Baseline memory usage:" >> "$REPORT_FILE"
go tool pprof -top "$BASELINE_MEM_PROF" | grep "Showing nodes" >> "$REPORT_FILE" || echo "N/A" >> "$REPORT_FILE"
echo "Optimized memory usage:" >> "$REPORT_FILE"
go tool pprof -top "$OPTIMIZED_MEM_PROF" | grep "Showing nodes" >> "$REPORT_FILE" || echo "N/A" >> "$REPORT_FILE"
echo "Baseline CPU samples:" >> "$REPORT_FILE"
go tool pprof -top "$BASELINE_CPU_PROF" | grep "Total samples" >> "$REPORT_FILE" || echo "N/A" >> "$REPORT_FILE"
echo "Optimized CPU samples:" >> "$REPORT_FILE"
go tool pprof -top "$OPTIMIZED_CPU_PROF" | grep "Total samples" >> "$REPORT_FILE" || echo "N/A" >> "$REPORT_FILE"
# 8. Summary
echo "=== PBO Complete! ==="
echo "Results saved to: $REPORT_FILE"
echo "Profile files generated:"
echo " - $BASELINE_CPU_PROF"
echo " - $BASELINE_MEM_PROF"
echo " - $OPTIMIZED_CPU_PROF"
echo " - $OPTIMIZED_MEM_PROF"
echo ""
echo "Test file location: $TEST_FILE"
echo ""
echo "Key improvements implemented:"
echo " ✓ Timer allocation reduction (eliminated time.After() calls)"
echo " ✓ I/O operation optimization (bulk writes vs byte-by-byte)"
echo " ✓ Memory allocation improvements (buffer pooling, pre-allocation)"
echo ""
# Show summary from report
tail -20 "$REPORT_FILE"
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