# CPU performance
top
htop
vmstat 1 10 # CPU, memory, I/O stats
sar -u 1 10 # CPU utilization
# Memory analysis
free -h
cat /proc/meminfo
vmstat -m # Memory slabs
# Disk I/O analysis
iostat -x 1 10 # Extended I/O statistics
iotop # I/O usage by process
# Network performance
iftop # Network usage by connection
nethogs # Network usage by process
# High CPU usage
top -o %CPU # Sort by CPU usage
ps aux --sort=-%cpu | head -10
# High memory usage
ps aux --sort=-%mem | head -10
smem -r # Shared memory analysis
# Disk space issues
df -h # Check filesystem usage
du -sh /* | sort -hr # Find large directories
lsof | grep deleted # Find deleted but open files
# Process troubleshooting
lsof -p PID # Files opened by process
strace -p PID # System calls made by process
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