Hatchet multi-process problem when handling large graphs about hatchet HOT 8 OPEN

Looks like we also have an issue reporting this #372. Thank you @Jokeren for reporting this, we'll look into this issue and keep you posted.

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cc: @cscully-allison

@Jokeren I am curious about the new database. Is the raw format json or are you converting the raw format to a json that hatchet's from_literal function can read?

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We are writing a calling context tree in memory directly to a json file. It could be read directly by hatchet's from_literal function.

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@cscully-allison Hi, just wonder if this problem has been resolved?

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@Jokeren Any idea where in the filter function this is hanging when num_procs>1? How long did the filter function take to process this file when num_procs=1?

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Any idea where in the filter function this is hanging when num_procs>1?

Haven't looked into that yet. I'll try and attach a call stack at where the process is hanging.

How long did the filter function take to process this file when num_procs=1?

A few minutes.

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Thanks @Jokeren! At my end, I'll also use hatchet's internal profiling tool that @cscully-allison added to debug where this is hanging.

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Hi @slabasan , this seems to the be call stack where hatchet is hanging.

File "test.py", line 4, in
g_range_filtered = g_range.filter(lambda x: x['GINS (I)'] > 0.0)
File "/home/kz21/GVProf/gvprof/spack/opt/spack/linux-rhel8-zen/gcc-8.3.1/miniconda3-4.9.2-mj647a4iulmnlilwwhwbdjkqqsm4ujyc/lib/python3.8/site-packages/hatchet/graphframe.py", line 379, in filter
returned_frames.append(queue.get())
File "/home/kz21/GVProf/gvprof/spack/opt/spack/linux-rhel8-zen/gcc-8.3.1/miniconda3-4.9.2-mj647a4iulmnlilwwhwbdjkqqsm4ujyc/lib/python3.8/site-packages/multiprocess/queues.py", line 100, in get
res = self._recv_bytes()
File "/home/kz21/GVProf/gvprof/spack/opt/spack/linux-rhel8-zen/gcc-8.3.1/miniconda3-4.9.2-mj647a4iulmnlilwwhwbdjkqqsm4ujyc/lib/python3.8/site-packages/multiprocess/connection.py", line 219, in recv_bytes
buf = self._recv_bytes(maxlength)
File "/home/kz21/GVProf/gvprof/spack/opt/spack/linux-rhel8-zen/gcc-8.3.1/miniconda3-4.9.2-mj647a4iulmnlilwwhwbdjkqqsm4ujyc/lib/python3.8/site-packages/multiprocess/connection.py", line 417, in _recv_bytes
buf = self._recv(4)
File "/home/kz21/GVProf/gvprof/spack/opt/spack/linux-rhel8-zen/gcc-8.3.1/miniconda3-4.9.2-mj647a4iulmnlilwwhwbdjkqqsm4ujyc/lib/python3.8/site-packages/multiprocess/connection.py", line 382, in _recv
chunk = read(handle, remaining)

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