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* [TUHS] kernel debugging in analogue
@ 2022-07-01 23:38 Steve Simon
  2022-07-02  1:52 ` [TUHS] " Al Kossow
  0 siblings, 1 reply; 6+ messages in thread
From: Steve Simon @ 2022-07-01 23:38 UTC (permalink / raw)
  To: tuhs


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


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2022-07-02  6:22 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-07-01 23:38 [TUHS] kernel debugging in analogue Steve Simon
2022-07-02  1:52 ` [TUHS] " Al Kossow
2022-07-02  1:57   ` Al Kossow
2022-07-02  2:45   ` Grant Taylor via TUHS
2022-07-02  2:50     ` Al Kossow
2022-07-02  6:20       ` Grant Taylor via TUHS

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