I was an "operator" on a Tandem NonStop. First was Pitney Bowes, I preferred the night shift. In the computer room, there was a Tandem, and a UNIVAC. My job was mostly swapping disk packs on the Tandem, and swapping tapes on the UNIVAC.
One of my jobs was to shutdown the dialup system (customers mailing machines would send data about the mailings they made overnight). I had to shutdown the dialup lines according to the time zones across Canada. I decided to write a script to automate it. My script would shutdown each phone line in order. The first time I ran it, I "broke" the Tandem. My script was a basic loop. It would check the time, and shutdown one of the timezones. First time I ran it the Tandem "mainframe" froze. I had to call "Doug" in the middle of the night, I was freaking out. Doug came in, looked at my script and quietly pointed out that the time command was a high priority system. My script didn't have any "waits" in it, the loop I wrote was constantly asking the system the time, taking up 100% of the processing. "Doug" had to reboot the Tandem, and after the "wait" was put into my script, all was good.
After I left Pitney Bowes I was an operator at the OPP (Ontario Provincial Police), that system had the OMPPAC system on it (Ontario Municipal Police Automated Cooperative), The criminal database for the Province of Ontario.
One of my jobs was to shutdown the dialup system (customers mailing machines would send data about the mailings they made overnight). I had to shutdown the dialup lines according to the time zones across Canada. I decided to write a script to automate it. My script would shutdown each phone line in order. The first time I ran it, I "broke" the Tandem. My script was a basic loop. It would check the time, and shutdown one of the timezones. First time I ran it the Tandem "mainframe" froze. I had to call "Doug" in the middle of the night, I was freaking out. Doug came in, looked at my script and quietly pointed out that the time command was a high priority system. My script didn't have any "waits" in it, the loop I wrote was constantly asking the system the time, taking up 100% of the processing. "Doug" had to reboot the Tandem, and after the "wait" was put into my script, all was good.
After I left Pitney Bowes I was an operator at the OPP (Ontario Provincial Police), that system had the OMPPAC system on it (Ontario Municipal Police Automated Cooperative), The criminal database for the Province of Ontario.