Increase load and How to Test load on a Linux system:

CPU Load Testing

1. stress: A tool that generates a specified amount of load on the CPU.
2. Example: stress -c 4 -t 60 (generates load on 4 CPUs for 60 seconds)
3. sysbench: A tool that generates a specified amount of load on the CPU.
4. Example: sysbench --test=cpu --cpu-max-prime=10000 run (generates load on the CPU)
5. cpuburn: A tool that generates a high load on the CPU.
6. Example: cpuburn -t 60 (generates high load on the CPU for 60 seconds)

Memory Load Testing

1. stress: Can also generate load on memory.
2. Example: stress -m 4 -t 60 (generates load on 4GB of memory for 60 seconds)
3. memtester: A tool that tests memory by generating a specified amount of load.
4. Example: memtester 1024M 10 (tests 1GB of memory for 10 iterations)

Disk I/O Load Testing

1. fio: A tool that generates a specified amount of load on disk I/O.
2. Example: fio -name=randwrite -ioengine=libaio -bs=4k -size=1G -numjobs=4 -runtime=60 (generates load on disk I/O)
3. dd: A tool that generates a specified amount of load on disk I/O.
4. Example: dd if=/dev/zero of=/dev/null bs=1M count=1000 (generates load on disk I/O)

Network Load Testing

1. iperf: A tool that generates a specified amount of load on network bandwidth.
2. Example: iperf -c <server_IP> -t 60 (generates load on network bandwidth)
3. netperf: A tool that generates a specified amount of load on network bandwidth.
4. Example: netperf -H <server_IP> -t TCP_STREAM -l 60 (generates load on network bandwidth)

Monitoring Load

1. top: A tool that displays real-time information about running processes and system load.
2. htop: A tool that displays real-time information about running processes and system load.
3. mpstat: A tool that displays CPU utilization statistics.
4. vmstat: A tool that displays virtual memory statistics.
5. iostat: A tool that displays disk I/O statistics.