Mpiexec Mpiexec is a parallel execution tool for launching MPI applications across multiple machines, often secured via SSH. It supports distributed high-performance computing over public or private infrastructure, enabling parallel password cracking and simulations across cloud or hybrid clusters.

Enables the launch and management of parallel MPI (Message Passing Interface) applications across multiple machines, including remote HPC nodes.
When configured with SSH, MPI can provide secure, passwordless execution of distributed computing tasks across remote HPC nodes.
This allows workloads to run across multiple systems instead of being limited to a single machine.
It is particularly useful for cloud-based HPC, decentralized computing, and large-scale simulations.

For password cracking workloads, John the Ripper can be compiled with MPI support and then launched with mpiexec or mpirun to distribute cracking work across multiple nodes.

mpiexec john
mpirun john

Hashcat does not use MPI in the same way. Instead, it has its own distributed workload feature called --brain-server / --brain-client, commonly referred to as Hashcat Brain.

hashcat --brain-server
hashcat --brain-client

Using SSH as a tunnel is vital for security over the public internet,
and you would need to adjust your encryption cipher mode according to performance needs.

for example using aes128-ctr or aes128-gcm@openssh.com for faster speeds, while using less CPU resources
ideal in a situation with large data flows of none critical data and where you want to spare the CPU for the actuall HPC workload task.

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