3 ms·

If you fired a bullet at 450m/s at a FreeBSD machine sitting 50 feet away, it would have enough time to boot up and perform operations before being struck and d

by xwdv 3y ago

If you fired a bullet at 450m/s at a FreeBSD machine sitting 50 feet away, it would have enough time to boot up and perform operations before being struck and destroyed by the bullet.

abwizz 3y ago
now that's a relief
tutfbhuf 3y ago
50 feet is about 15 meter 450 m/s is 1620 km/h
- deleted 3y ago
  [deleted]
joahua 3y ago
With an optical muzzle flash companion to wake it / circumvent the speed of sound, it could even complain about being shot at! https://ieeexplore.ieee.org/document/6685317 https://ieeexplore.ieee.org/document/6685317
- vancroft 3y ago
  Or fire back if mounted on an autonomous drone
the8472 3y ago
For ICBM test warheads they have a system that replaces the nuclear pit with a sensor package that measures the incoming shockfront, does signal processing and gets out a radio signal before the entire thing is crushed.
- whalesalad 3y ago
  it’s giving UDP energy
- sdfghswe 3y ago
  Does this have a name? A keyword I could search for? A wikipedia page?
  - the8472 3y ago
    High Explosive Radio Telemetry
  - barryp 3y ago
    Try "The Computer Designed To Die In Microseconds" https://www.youtube.com/watch?v=FYdAT0v4DHs https://www.youtube.com/watch?v=FYdAT0v4DHs (Scott Manley) https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf
- MichaelZuo 3y ago
  So if folks truly cared, it's possible to design a computer system to boot up, in a barebones fashion, and then do meaningful work and then transmit it, in under a millisecond?
  - sudobash1 3y ago
    Certainly, and I imagine that there are plenty that we interact with on a regular basis. For example, door security sensors (like for Ring) will be off nearly all the time. When someone opens the door, they will power up, send a notification, and go dormant again. I don't know if this will happen within a single millisecond, but it certainly could if there was a design need. For many simple embedded systems that plug into the wall, the "boot" process will happen in under a millisecond. But it will take considerably longer than that for the voltage levels to stabilize. The real thing which differentiates these from a PC or phone is that they are not running what we would typically call an OS. They may be running an RTOS (a very simplified OS), but for many of them, as soon as they have stable power, they are off to the races (Just like the home-computers of the 80s. Just plug in and go.)
  - dehrmann 3y ago
    I see you've never worked with microcontrollers.
    - MichaelZuo 3y ago
      Okay then link a microcontroller that can do that in under 1 milisecond?
      - 6502guy 3y ago
        A 6502 takes 7 cycles to execute the reset vector and run user code. Of course the definition of "usable" work can be argued over but even a C64 released in the 80s will run your code in less then 10us 1ms is an enormous amount of time. I'm really curious why you would think otherwise
        3y ago

by xwdv 3y ago

If you fired a bullet at 450m/s at a FreeBSD machine sitting 50 feet away, it would have enough time to boot up and perform operations before being struck and destroyed by the bullet.

abwizz 3y ago

now that's a relief

tutfbhuf 3y ago

50 feet is about 15 meter 450 m/s is 1620 km/h

deleted 3y ago
[deleted]

joahua 3y ago

With an optical muzzle flash companion to wake it / circumvent the speed of sound, it could even complain about being shot at! https://ieeexplore.ieee.org/document/6685317 https://ieeexplore.ieee.org/document/6685317

vancroft 3y ago
Or fire back if mounted on an autonomous drone

the8472 3y ago

For ICBM test warheads they have a system that replaces the nuclear pit with a sensor package that measures the incoming shockfront, does signal processing and gets out a radio signal before the entire thing is crushed.

whalesalad 3y ago
it’s giving UDP energy
sdfghswe 3y ago
Does this have a name? A keyword I could search for? A wikipedia page?
- the8472 3y ago
  High Explosive Radio Telemetry
- barryp 3y ago
  Try "The Computer Designed To Die In Microseconds" https://www.youtube.com/watch?v=FYdAT0v4DHs https://www.youtube.com/watch?v=FYdAT0v4DHs (Scott Manley) https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf
MichaelZuo 3y ago
So if folks truly cared, it's possible to design a computer system to boot up, in a barebones fashion, and then do meaningful work and then transmit it, in under a millisecond?
- sudobash1 3y ago
  Certainly, and I imagine that there are plenty that we interact with on a regular basis. For example, door security sensors (like for Ring) will be off nearly all the time. When someone opens the door, they will power up, send a notification, and go dormant again. I don't know if this will happen within a single millisecond, but it certainly could if there was a design need. For many simple embedded systems that plug into the wall, the "boot" process will happen in under a millisecond. But it will take considerably longer than that for the voltage levels to stabilize. The real thing which differentiates these from a PC or phone is that they are not running what we would typically call an OS. They may be running an RTOS (a very simplified OS), but for many of them, as soon as they have stable power, they are off to the races (Just like the home-computers of the 80s. Just plug in and go.)
- dehrmann 3y ago
  I see you've never worked with microcontrollers.
  - MichaelZuo 3y ago
    Okay then link a microcontroller that can do that in under 1 milisecond?
    - 6502guy 3y ago
      A 6502 takes 7 cycles to execute the reset vector and run user code. Of course the definition of "usable" work can be argued over but even a C64 released in the 80s will run your code in less then 10us 1ms is an enormous amount of time. I'm really curious why you would think otherwise
      - 3y ago