2 Jul
2022
2 Jul
'22
1:38 a.m.
i remember a fellow student debugging an lsi11 kernel using a form of analogue
vectorscope.
i think it had a pair of DACs attached to the upper bits of the address bus. it generated
a 2d pattern which you could recognise as particular code - interrupts are here, userspace
is there, etc.
the brightness of the spot indicated the time spent, so you got a bit of profiling too -
and deadlocks became obvious.
anyone remember these, what where they called? i think it was an HP or Tek product.
-Steve