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Think about Loose Coupling

Re: robotic laser welder

by mattr (Curate)
on Jul 31, 2001 at 13:48 UTC ( #101107=note: print w/replies, xml ) Need Help??

in reply to robotic laser welder

Thank you very much (everyone) for all the interesting comments!

I guess I don't have the same problem with the customer building a new machine since they cost a quarter mil ($) each, but since it is very highly tweaked already and the only moving parts are the powder bucket and laser head, I think if Perl is used it will probably be mainly in developing data models which will get crunched by the preprocessor, and maybe in a web site that handles requests. It would be very cool though if we could have a more realistic 3D display on the terminal but not so sure it is needed right now.

Your links ginseng are very interesting, especially I noticed rtlinux has gotten more mature it seems, and the puffin page (Mat project on sourceforge) mentions that you can have different processes written in different languages.

I still am pretty interested though in seeing if a partly Perl system is fast enough to write to a rotating mirror. Not for the system mentioned above, for a simple rgb projector setup. Another friend (a DJ) has a powerful laser like that used in clubs but it is mainly powered by a dedicated PCI card and an already large library of (C,windows) programs but I'll have to keep thinking about what is possible.

Thanks again for a very interesting post.

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[davido]: yeah, umount -f isn't powerful enough.
[tye]: probably something in the init subsystem that does the mounting that you could disable and reboot.
davido needs to close laptop to board flight home from yapc.
[davido]: I'll look into it in a few hours probably.
[davido]: when i do get to that point I think I'll do it in a vm snapshot just in case. :)
[oiskuu]: tye, you were right: loginuid/sessionid are part of task struct if compiled with AUDITSYSCALL. I have some doubts if you should actually depend on that feature.
[Corion]: oiskuu: Depends on what you want to do with that information
[tye]: I'm not depending on that feature. But I could in this environment. I'm using getlogin(). shrug
[Corion]: For benign logging (which user started this DB instance), it's OK
[tye]: We use auditd for security monitoring. So we can rely on auditing being enabled. I'm not sure who would want to not be able to audit. Maybe some VM inside another system with audit?

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