[export] [cc] Support ti.RecordGroupHint to group launched kernels

[archibate]

Related issue = [数据删除]

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I need this for exporting mpm_lagrangian_forces.

[codecov]

Codecov Report

Merging #1880 into master will increase coverage by 0.54%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1880      +/-   ##
==========================================
+ Coverage   43.25%   43.80%   +0.54%     
==========================================
  Files          44       45       +1     
  Lines        6320     6168     -152     
  Branches     1092     1097       +5     
==========================================
- Hits         2734     2702      -32     
+ Misses       3416     3297     -119     
+ Partials      170      169       -1     

Impacted Files	Coverage Δ
python/taichi/cc_compose.py	0.00% <0.00%> (ø)
python/taichi/core/__init__.py	0.00% <0.00%> (ø)
python/taichi/core/record.py	0.00% <0.00%> (ø)
python/taichi/core/util.py	0.38% <ø> (+<0.01%)	⬆️
python/taichi/lang/__init__.py	42.46% <ø> (+0.01%)	⬆️
python/taichi/lang/ast_checker.py	70.58% <0.00%> (-1.64%)	⬇️
python/taichi/testing.py	75.00% <0.00%> (-0.72%)	⬇️
python/taichi/lang/linalg.py	89.33% <0.00%> (-0.67%)	⬇️
python/taichi/lang/meta.py	62.31% <0.00%> (-0.54%)	⬇️
... and 15 more

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[archibate]

@yuanming-hu I will merge this in 24 hours if you don't reject me, otherwise our work in TaichiActor will be blocked, thank for understanding.

[Hanke98]

@yuanming-hu I will merge this in 24 hours if you don't reject me, otherwise our work in TaichiActor will be blocked, thank for understanding.

I am so sorry that I didn't see your request until today, I will review your code asap.

[Hanke98]

Cool! I reviewed your code and I thought it is very very useful to record the launch order in group.

However, when I tried to run demo_record_group_hint.py I got:

[I 09/21/20 19:45:31.023] [action_recorder.cpp:start_recording@27] ActionRecorder: start recording to [record.yml]
[W 09/21/20 19:45:31.023] [init.py:adaptive_arch_select@552] Arch=[Arch.cc] is not supported, falling back to CPU
[Taichi] Starting on arch=x64
Traceback (most recent call last):
File "demo_record_group_hint.py", line 22, in
with ti.RecordGroupHint('my_substep'):
File "/Users/liujiafeng/playground/projects/taichi/python/taichi/core/record.py", line 33, in init
if name in recorded:
NameError: name 'recorded' is not defined

I think the variable recorded in RecordGroupHint class may be the reason. Could you please help me to run this file correctly? Thanks a lot!

[Hanke98]

I am not sure if this is correct. Maybe you should use RecordGroupHint.record or self.record here.

[Hanke98]

Great! LGTM! Thanks for writing such useful tool! By the way, can we record kernels in group for other backends, such as metal?