bkill all jobs by Ciro Santilli 37 Updated 2025-07-16
By the current user:
bkill 0
User mode emulation by Ciro Santilli 37 Updated 2025-07-16
User mode emulation refers to the ability of certain emulators to emulate userland code running on top of a specific operating system, usually Linux.
For example, QEMU allows you to run a variety of userland ELF programs directly on it, without an underlying Linux kernel running.
User mode emulation is achieved by implementing system calls and special filesystems such as /dev manually on the emulator one by one.
The general tradeoff is that simulation is less acurate as it may lack certain highly advanced kernel functionality you haven't implemented yet. But it is much easier to run executables with it, and you don't have to wait for boot to finish before running, you just run executables directly from the command line.
bsub on foreground by Ciro Santilli 37 Updated 2025-07-16
Run bsub on foreground, show stdout on host stdout live with an interactive with the bsub -I option:
bsub -I 'echo a;sleep 1;echo b;sleep 1;echo c'; echo done
Ctrl + C kills the job on remote as well as locally.
Double-slit experiment by Ciro Santilli 37 Updated 2025-07-16
Amazingly confirms the wave particle duality of quantum mechanics.
The effect is even more remarkable when done with individual particles such individual photons or electrons.
Richard Feynman liked to stress how this experiment can illustrate the core ideas of quantum mechanics. Notably, he night have created the infinitely many slits thought experiment which illustrates the path integral formulation.
Quantum compilation by Ciro Santilli 37 Updated 2025-07-16
Software that maps higher level languages like Qiskit into actual quantum circuits.
Encryption algorithms that run on classical computers that are expected to be resistant to quantum computers.
This is notably not the case of the dominant 2020 algorithms, RSA and elliptic curve cryptography, which are provably broken by Grover's algorithm.
Post-quantum cryptography is the very first quantum computing thing at which people have to put money into.
The reason is that attackers would be able to store captured ciphertext, and then retroactively break them once and if quantum computing power becomes available in the future.
There isn't a shade of a doubt that intelligence agencies are actively doing this as of 2020. They must have a database of how interesting a given source is, and then store as much as they can given some ammount of storage budget they have available.
A good way to explain this to quantum computing skeptics is to ask them:
If I told you there is a 5% chance that I will be able to decrypt everything you write online starting today in 10 years. Would you give me a dollar to reduce that chance to 0.5%?
Post-quantum cryptography is simply not a choice. It must be done now. Even if the risk is low, the cost would be way too great.

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