Okay, so today I messed around with something called “shadow wife.” Sounds kinda spooky, right? Well, it’s not a ghost story, but it did give me a bit of a headache at first.
First, I got this idea from a friend. He was talking about how to keep an eye on a program’s performance without messing with the main process. So I did a little digging and stumbled upon this “shadow” thing. Basically, it’s like running a copy of the program in the background to see how things are going.
I started by grabbing the code for the program I wanted to watch. It was a simple script that did some calculations. Nothing fancy. Then, I duplicated it and made a few changes. I added some code to make it log things like memory usage and CPU time to a separate file.
Here’s where things got a little tricky. I had to figure out how to run both versions of the program at the same time without them crashing into each other. I used a tool called “nohup” to run the shadow version in the background. It’s like telling the program, “Hey, keep running even if I close the terminal.”
- First, I ran the original program:
./original_program
- Then, I started the shadow version with:
nohup ./shadow_program &
- The ampersand (&) at the end is important. It tells the system to run it in the background.
With both programs running, I waited and watched. The original program did its thing, and the shadow version silently tracked everything and logged the information. I kept checking the log file to see what was happening. Memory usage, CPU time, everything was right there.
After a while, I stopped both programs. Then the fun part started, analyzing the data! I checked if the shadow version’s measurements matched what I expected. It was like comparing notes to see if they lined up. Most of the time, they did, which was cool.
What Did I Learn?
This little experiment taught me a few things:
- Running a “shadow” version of a program is a neat way to monitor its performance without interfering.
- Tools like “nohup” are super useful for background tasks.
- It is very important to check every step.
- Analyzing logs can be a bit of a pain, but it’s worth it to understand what’s going on under the hood.
Overall, it was a fun little project. It wasn’t perfect, and I’m sure there are better ways to do this, but it was a good learning experience. If you’re into this kind of stuff, give it a try! It is very helpful to learn something!