Years ago, with insufficient experience, I was trying to debug a device-driver problem. I used printfs. Stupid.
Eventually I created an in-memory array, updated that with integer data which corresponded to information I wanted, and that was "fast enough" to expose the issue.
Many years later, on a Connection Machine, we discovered that asking for the current day/date would bring all processors to a screeching halt while the system propagated the correct date/time to every processor. Also while trying to profile behavior and performance.
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
(no subject)
Date: 2015-01-09 02:26 pm (UTC)Eventually I created an in-memory array, updated that with integer data which corresponded to information I wanted, and that was "fast enough" to expose the issue.
Many years later, on a Connection Machine, we discovered that asking for the current day/date would bring all processors to a screeching halt while the system propagated the correct date/time to every processor. Also while trying to profile behavior and performance.
It's not easy.