dbg_trace timestamp milliseconds

Stream: general

[Samuel Chassot]

Hi everyone,
I am trying to improve performance of our program at runtime, and for that I would like to print in a dbg_trace (or elsewhere) the current time in milliseconds, to later perform analysis using them. Is there a proper way to do so?
I tried IO.monoMsNow, IO.Process.output { cmd := "date", args := #["+%s%3N"] } and other related things, but it is always printing 0, and I couldn't find why.

Thanks a lot :)

[Henrik Böving]

I would probably suggest to work with proper profiling tools instead

[Samuel Chassot]

I am, but with them I am loosing information like what are the arguments passed to a given function for a given call.

[Henrik Böving]

Well if your function is indeed in an IO compatible monad you should be able to use IO.monoMsNow and it should just print things, if it is then monoMsNow returning 0 is certainly a bug

[Samuel Chassot]

that's the thing, the function is already in an Except monad and I couldn't change the signature without introducing to much of a burden. I was using IO.monoMsNow with unsafe

[Henrik Böving]

If you do that the compiler can arbitrarily reorder the monoMsNow call, you will at least have to use the same continuation based trick that dbgTrace uses.

[Samuel Chassot]

Henrik Böving said:

If you do that the compiler can arbitrarily reorder the monoMsNow call, you will at least have to use the same continuation based trick that dbgTrace uses.

Alright, that's what I suspected. Thank you!