About Dr.jit printf_async

[lesphere]

Hi,

I'm trying to print some debug info with dr.printf_async(), but I wonder where the output goes.

This is the example code with no output:

a = mi.Uint(1)
dr.printf_async('test %d\n', a)

[merlinND]

Hello @lesphere,

Your example does not generate a kernel, so the the async print instruction never gets executed. The following example prints as expected:

a = mi.UInt32([1, 2, 3])
dr.printf_async('test %d\n', a)
b = dr.sqr(a)
dr.eval(b)

[wjakob]

Also, this will be printed on the console. It might not show up in a Jupyter notebook. We will fix this soon.

[merlinND]

Good point, I only tried it in a REPL in the console.

[lesphere]

It works. But if I run the code for the second time, there's no output unless I print(b).