Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Htop explained

peteris.rocks

Post reply on HN
Print view View original

11–20 of 105 posts

Re: Htop explained

#11

Post by garblegarble »

guessmyname wrote: post #9

I switched to macOS from Linux two weeks ago and I am starting to regret that decision. Most — if not all — the commands that I thought I had mastered after years working on Linux environments stopped working because their BSD counterparts have slightly differences that completely break everything I try to do. It is even more frustrating when I realize that I have to deactivate security features built-in the new Appl…

For general dev use in macOS I find that installing the GNU userland (through MacPorts) keeps me sane, "sudo port install coreutils moreutils htop gnutar" and then put /opt/local/libexec/gnubin/:/opt/local/bin at the start of your PATH.

Doesn't help much with dtrace though!

Re: Htop explained

#12

Post by jzelinskie »

guessmyname wrote: post #9

I switched to macOS from Linux two weeks ago and I am starting to regret that decision. Most — if not all — the commands that I thought I had mastered after years working on Linux environments stopped working because their BSD counterparts have slightly differences that completely break everything I try to do. It is even more frustrating when I realize that I have to deactivate security features built-in the new Appl…

Homebrew has packages prefixed with `g`, standing for GNU, that you can install to avoid some of the BSDisms on macOS.

Example: `gsed` actually parses whitespace the way I think it will; the builtin `sed` does not.

Re: Htop explained

#13

Post by sirodoht »

guessmyname wrote: post #9

I switched to macOS from Linux two weeks ago and I am starting to regret that decision. Most — if not all — the commands that I thought I had mastered after years working on Linux environments stopped working because their BSD counterparts have slightly differences that completely break everything I try to do. It is even more frustrating when I realize that I have to deactivate security features built-in the new Appl…

You can install the GNU coreutils: http://apple.stackexchange.com/questions/69223/how-to-replac...

Re: Htop explained

#14

Post by camtarn »

"You'll probably want to keep cron. But if you don't, then you should stop and disable the service. Because otherwise when trying to remove it with apt remove cron it will try to install postfix!"

...wat?

Is that actually a thing?

Re: Htop explained

#15

Post by nrclark »

guessmyname wrote: post #9

I switched to macOS from Linux two weeks ago and I am starting to regret that decision. Most — if not all — the commands that I thought I had mastered after years working on Linux environments stopped working because their BSD counterparts have slightly differences that completely break everything I try to do. It is even more frustrating when I realize that I have to deactivate security features built-in the new Appl…

You should give Macports a try if you haven't already! I run it on my macbook, and it's made a world of difference. 99% of everything I use in Linux can be found in Macports, and it "just works" for the most part.

You can't get kernel-specific things like strace, but they do have just about everything else. The big sell for me was being able to install the GNU versions of everything.

Macports keeps everything in /opt, so you also never have to worry about it clobbering anything that MacOS expects to work in a certain way.

edit: some background on Macports vs Homebrew - it's basically a vi/emacs kind of a thing. Homebrew utilizes the MacOS system stuff a fair amount, and installs everything to /usr/local. Macports tries to keep everything fully separate, and installs into /opt.

My personal experiences with Homebrew weren't great, but others will probably have the opposite opinion.

Re: Htop explained

#16

Post by camtarn »

"[explanation of acpid] But I'm on a virtual server that I don't intend to suspend/resume. I am going to remove it for fun and see what happens. ... I was able to successfully reboot the droplet but after halt Digital Ocean thought it was still on so I had to Power Off using the web interface. So I should probably keep this."

Science! :D

I love the approach of systematically going through and prodding everything to see what things do and whether they're actually required. I remember doing this on my Windows 95 machine, stripping down running tasks using Task Manager. Of course, in Windows 95, if you killed the wrong task the system would just reboot... :P

Re: Htop explained

#18

Post by nrclark »

garblegarble wrote: post #11
guessmyname wrote: post #9

I switched to macOS from Linux two weeks ago and I am starting to regret that decision. Most — if not all — the commands that I thought I had mastered after years working on Linux environments stopped working because their BSD counterparts have slightly differences that completely break everything I try to do. It is even more frustrating when I realize that I have to deactivate security features built-in the new Appl…

For general dev use in macOS I find that installing the GNU userland (through MacPorts) keeps me sane, "sudo port install coreutils moreutils htop gnutar" and then put /opt/local/libexec/gnubin/:/opt/local/bin at the start of your PATH. Doesn't help much with dtrace though!

yep! Macports is awesome.

Re: Htop explained

#19

Post by Debonnys »

> If I had two cores, my CPU usage would be 50% since my computer can run two processes at the same time. The load average of a computer with 2 cores that has a 100% CPU usage would be 2.00.

If I recall correctly the CPU usage would still be 100% but could go up to 200% if both cores are fully used.

Re: Htop explained

#20

Post by Morpheus_ro »

TeMPOraL wrote: post #3

Thank you! Great writeup! I applaud the way you approached it - figuring out every single thing about a tool. Also, I didn't know about 'od' command. Thanks again!

please do explain in 2 words the od command. I was looking on the page and there is only one od command and it is not explained. thank you
Post reply on HN