Why is iterating over a file twice faster than reading it into memory and computing twice?
I’m comparing the following
io
Why is I/O uninterruptible?
What is the rationale behind making I/O uninterruptible? What would be the negative consequences if a process handling I/O were allowed to handle a signal?
iotop showing 1.5 MB/s of disk write, but all programs have 0.00 B/s
I don’t understand iotop output: it shows ~1.5 MB/s of disk write (top right), but all programs have 0.00 B/s. Why?
What’s the progress regarding improving system performance/responsiveness during high disk I/O?
Whenever there is high disk I/O, the system tends to be much slower and less responsive than usual. What’s the progress on Linux kernel regarding this? Is this problem actively being worked on?
Special File that causes I/O error
I want to automatically test if a piece of software reacts as expected if an essential SQLite DB file fails to be read (causing an I/O error). Exactly that happened some days ago at a client. We manually fixed it but now I want to create automatic code to fix it and need access to a broken file to test that.
systemd connect to stdin/stdout after service has started
I have a systemd service that is a console application, meaning that it is controlled by sending commands to its stdin and it outputs information to sdout. How can I set up the systemd service so that I can connect to its stdin and give it commands at any point, then detach from this, and repeat when necessary?
Is setting a higher nice level for a process an effective way to reduce its impact on system load/CPU time?
I have an rsync cron job which is pushing the server load and triggering monitor alerts. If I set the job to be run with a high nice level, would that effectively reduce the impact it has on system load values?
Why do backgrounded processes sometimes stop spontaneously?
Sometimes, some time after I’ve backgrounded a process with bg in bash, when I press Enter in the same shell to redisplay the prompt (just to check that I’m still in bash when some output from the background process has been displayed), the background process seems to stop spontaneously.
What is the difference between > and >> (especially as it relates to use with the cat program)?
Suppose that I have a file called temp.txt. Using the cat program, I would like to add the contents of this file to the end of myfile.txt — creating myfile.txt if it does not exist and appending to it if it does. I am considering these possibilities: cat temp.txt > myfile.txt or cat temp.txt >> … Read more