[Lang] print fails on a simple test case with windows' ipython & jupyter notebook

[mrbulb]

Describe the bug
When I run the print code with ipython in Win10 platform and jupyter notebook in Win10/Ubuntu platform, it fails to print the ouput

Log/Screenshots
IPython in Win10 platform
NOTE：it will print all output until the quit

Jupyter notebook

To Reproduce

import taichi as ti

# initialization
ti.init(arch=ti.gpu)

@ti.kernel
def hello(i: ti.i32):
    a = 40
    print('Hello world!', a + i)
    
hello(2)

If you have local commits (e.g. compile fixes before you reproduce the bug), please make sure you first make a PR to fix the build errors and then report the bug.

[archibate]

GPU kernels won't really be executed until ti.sync() or host access, for performance reasons.
So if you:

import taichi as ti

# initialization
ti.init(arch=ti.gpu)

@ti.kernel
def hello(i: ti.i32):
    a = 40
    print('Hello world!', a + i)

hello(2)
ti.sync()

It will print things in time.

Or ti.init(arch=ti.cpu) solves the issue too, since CPU kernels don't have this mechanism.

Sorry about not mentioning this in documentation, I'll doc this behavior about ti.sync() later.

[mrbulb]

GPU kernels won't really be executed until ti.sync() or host access, for performance reasons.
So if you:

import taichi as ti

# initialization
ti.init(arch=ti.gpu)

@ti.kernel
def hello(i: ti.i32):
    a = 40
    print('Hello world!', a + i)

hello(2)
ti.sync()

It will print things in time.

Or ti.init(arch=ti.cpu) solves the issue too, since CPU kernels don't have this mechanism.

Sorry about not mentioning this in documentation, I'll doc this behavior about ti.sync() later.

thank you for your quick reply, ti.init(arch=ti.cpu) or ti.sync() is now work for me when using IPython in windows platform
However it still doesn't work for jupyter notebok, may be it is the same problem like @liaopeiyuan mentions in #1136 (comment)