UNIX for Dummies Questions & Answers

That's the exact same as my linux system, which is happy to make a core from running your code. Argh.

Check for anything weird in dmesg, maybe it's telling you why it's not making a core.

Also try touch core to see if it's really possible to make a file named 'core' in your directory.

Also try changing core_pattern to something like "core.%p" or "core.%e".

What's the output from "ulimit -a"?

I am sorry, this is my fault. I forget to set "unlimit -c unlimited" because the command "ulimit" output "unlimited". After I use "unlimit -c unlimited", the coredump appears. Thx!

Wow! I never was a big fan of limits -- very old think, paranoid, weakness focused, from when resources were very limited and expensive, "we give login to maniacs" sort of thinking.

...and I've been a fan of limits ever since I swapdeathed instead of a stack overflow.

Tuning beats limits every day -- good scheduling, O/S that have ways of ensuring sharing without limiting. One site had that pg that likes to loop forever, and the Sys Admins refused to kill it, saying they do not take those calls, the smart scheduler ensures they do not take CPU from others and eventually a reboot clears them away. Another site went bonkers when I found a task to use 100 % of the cpu, nice -19. Nobody was complaining or experiencing any slowness. UNIX is not an IBM Mainframe, that it needs all sorts of safeguards to protect it. I am not even sure the Mainframe is like that any more, since I expect it runs on UNIX under the covers. They never wanted to see the last CPU used. Why buy it? Some were rather persistent about this desire for idle CPU's. I attribute it to childhood trauma.

There is a devil of a control freak in human nature that never wants anything unanticipated to happen. I have surprises and delights for them, like it or not!