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nuriaion's comments

nuriaion | 4 months ago | on: Penpot: The Open-Source Figma

Penpot is also implemented in Clojure/ClojureScript. ClojureScript is a Clojure Dialect which compiles down to JavaScript. So there is no Java involved on the frontend :)

nuriaion | 3 years ago | on: HVDC transmission line to connect three ISO regions

I think that would actually be more expensive as you still have the all the hard problems. Like how do you isolate the power electronics. You can use air which is cheap but needs a lot of space. (i learned that you need 1mm per 1kV) You need a lot of space which has to be very secure. etc

Additionally you need to control 5000 converters without getting oscillations etc. (probably over glas) Also they will probably need a lot more space.

nuriaion | 4 years ago | on: Apple’s Universal Control

Good HiDPI scaling on my external Monitor is one of the reasons i switched back to os x. For me that works very good independent of the monitor manufacturer.

nuriaion | 5 years ago | on: It Is Never a Compiler Bug Until It Is

That's a nice way to get gdb!

In our case it would probably not have helped. We had a fixed old mcu board where the functionality grow over the years. We were fighting over bytes...

nuriaion | 5 years ago | on: It Is Never a Compiler Bug Until It Is

Some years ago i worked on a part of a specialized steering system for a car. This was done with certified everything (Certified Compiler, Processor, a lot of paper work etc.)

This was a 16-Bit processor and the C-compiler had a "funny" bug. If you had a struct with 3 8Bit Values in a row and a 16Bit Value afterwards it would overlap the 8Bit Value with the 16Bit value:

  struct {
    int8 a;
    int8 b;
    int8 c;
    int16 d;
  }
In this case the variable c and d would have the same address. This was on a cpu where we didn't had a debuger (not enough memory left for it), we only had a serial port for debuging.

nuriaion | 6 years ago | on: VW opens preorders for the ID.3, its first long-range electric car

Also i would assume that the non-Tesla offerings will be cheaper. What i saw about the automobile industry ist that they are very good in building factories/supply chain's where they can produce as cheap as possible. The setup of such a supply chain takes years but when it's there i assume that the prices will be lower than Tesla's. (Also so far i know Tesla need's still a relativ big amout of work hours per car, 60h compare to 30h industry standard)

nuriaion | 7 years ago | on: Modern Microprocessors – A 90-Minute Guide (2001-2016)

The space in an instruction is very limited. (If the representation of an instruction needs more bits you need more bandwidth, more cache space etc.) So it can be beneficial to only address 8 registers but then have a detection for spilling of spilling to RAM etc. (It can even be beneficial to specify only 2 registers (a = a + b instead of a = b + c) and replace a copy of registers with a rename.

nuriaion | 12 years ago | on: Are we shooting ourselves in the foot with stack overflows?

As far as i understood the slides the stack overflow part is only one critical problem.

The v850 has 1...256kBytes of RAM. Let's assume 256kBytes of RAM. Then lets assume they have a Stack of 16kByte. => There are only 983 Bytes of free stack. Then a function call with 5 Int parameters and 10 Int variables needs around 64Bytes. => Only 16 recursive calls are needed to have a stack overflow.

Further because the critical data structure in the os are not secured the os will have no idea that something is wrong.

(In several projects we had to have our critical data 2 times in RAM, once normal and once inverted. In a critical project we even had to do all computations two times, once with the normal data and once with the inverse data. This way you will also find some bit flipps of the ALU, RAM etc.)

edit: In the slides i found that the stacksize is 4kByte => only 245Bytes are free! So you can't make many recursive calls!

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