Add `gdb` pretty-printers for rmm types #1088

upsj · 2022-08-17T16:18:48Z

Description

This PR adds a pretty-printer for device_uvector and pulls in Thrust pretty-printers that were added in NVIDIA/thrust#1631. CMake provides a convenience script to load all of the pretty-printers, to resolve the duplication concerns raised in rapidsai/cudf#11499.

Example output:

$ gdb -q gtests/DEVICE_UVECTOR_TEST
Reading symbols from gtests/DEVICE_UVECTOR_TEST...
(gdb) b cudaMalloc
Function "cudaMalloc" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (cudaMalloc) pending.
(gdb) run
Starting program: /home/nfs/tribizel/rapids/rmm/build/cuda-11.5.0/feature__pretty-printers/debug/gtests/DEVICE_UVECTOR_TEST 
warning: Error disabling address space randomization: Operation not permitted
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1".
Running main() from gmock_main.cc
[==========] Running 95 tests from 5 test suites.
[----------] Global test environment set-up.
[----------] 19 tests from TypedUVectorTest/0, where TypeParam = signed char
[ RUN      ] TypedUVectorTest/0.MemoryResource
[New Thread 0x7f741efc1000 (LWP 86147)]

Thread 1 "DEVICE_UVECTOR_" hit Breakpoint 1, 0x00007f7426dddc80 in cudaMalloc () from /home/nfs/tribizel/rapids/compose/etc/conda/cuda_11.5/envs/rapids/lib/libcudart.so.11.0
(gdb) c
Continuing.
[New Thread 0x7f741e7c0000 (LWP 86148)]
[       OK ] TypedUVectorTest/0.MemoryResource (999 ms)
[ RUN      ] TypedUVectorTest/0.ZeroSizeConstructor
[       OK ] TypedUVectorTest/0.ZeroSizeConstructor (0 ms)
[ RUN      ] TypedUVectorTest/0.NonZeroSizeConstructor

Thread 1 "DEVICE_UVECTOR_" hit Breakpoint 1, 0x00007f7426dddc80 in cudaMalloc () from /home/nfs/tribizel/rapids/compose/etc/conda/cuda_11.5/envs/rapids/lib/libcudart.so.11.0
(gdb) finish
Run till exit from #0  0x00007f7426dddc80 in cudaMalloc () from /home/nfs/tribizel/rapids/compose/etc/conda/cuda_11.5/envs/rapids/lib/libcudart.so.11.0
rmm::mr::cuda_memory_resource::do_allocate (bytes=<optimized out>, this=<optimized out>) at /home/nfs/tribizel/rapids/rmm/include/rmm/mr/device/cuda_memory_resource.hpp:70
70          RMM_CUDA_TRY_ALLOC(cudaMalloc(&ptr, bytes));
(gdb) finish
Run till exit from #0  rmm::mr::cuda_memory_resource::do_allocate (bytes=<optimized out>, this=<optimized out>) at /home/nfs/tribizel/rapids/rmm/include/rmm/mr/device/cuda_memory_resource.hpp:70
0x00005587874feef0 in rmm::device_buffer::allocate_async (bytes=12345, this=0x7ffefebb46b0) at /home/nfs/tribizel/rapids/rmm/include/rmm/device_buffer.hpp:418
418         _data     = (bytes > 0) ? memory_resource()->allocate(bytes, stream()) : nullptr;
Value returned is $1 = (void *) 0x7f73ff000000
(gdb) finish
Run till exit from #0  0x00005587874feef0 in rmm::device_buffer::allocate_async (bytes=12345, this=0x7ffefebb46b0) at /home/nfs/tribizel/rapids/rmm/include/rmm/device_buffer.hpp:418
TypedUVectorTest_NonZeroSizeConstructor_Test<signed char>::TestBody (this=<optimized out>) at /home/nfs/tribizel/rapids/rmm/tests/device_uvector_tests.cpp:55
55        EXPECT_EQ(vec.size(), size);
(gdb) print vec
$2 = {_storage = {_data = 0x7f73ff000000, _size = 12345, _capacity = 12345, _stream = {stream_ = 0x0}, _mr = 0x558787561008 <rmm::mr::detail::initial_resource()::mr>}}
(gdb) source load-pretty-printers 
(gdb) print vec
$3 = rmm::device_uvector<signed char> of length 12345, capacity 12345 = {0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 
  0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 
  0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 
  0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 
  0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 
  0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 
  0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000', 0 '\000'...}
(gdb)

Checklist

I am familiar with the Contributing Guidelines.
New or existing tests cover these changes.
The documentation is up to date with these changes.

bdice

Some thoughts on Python clarity -- I haven't used GDB pretty printers before so forgive me if I'm not aware of some limitations. Does GDB run the Python interpreter from the user environment, or a recent version like 3.8+?

scripts/gdb-pretty-printers.py

bdice · 2022-08-17T16:40:46Z

scripts/gdb-pretty-printers.py

+            if char == '>':
+                depth -= 1
+            if depth == 0:
+                return False


Trying to understand the logic here -- if you only care if the < brackets are balanced, you can just count those. What's the "not alias" part mean?

I guess an example is easiest: std::vector<std::optional<std::pair<int, std::optional<double>>>> should pass, but std::vector<std::optional<std::pair<int, std::optional<double>>>>::some_templated_type_alias<int> should fail. gdb sometimes doesn't resolve type aliases, so the pretty-printer might erroneously be called for such a some_templated_type_alias<int>, and would fail at accessing the expected members.

upsj · 2022-08-17T17:09:06Z

gdb runs in the user environment, so I wouldn't bet on recent Python being available unfortunately

harrism · 2022-08-17T22:34:16Z

scripts/load-pretty-printers.in

@@ -0,0 +1,2 @@
+source @Thrust_SOURCE_DIR@/scripts/gdb-pretty-printers.py


What is a .in file?

Not sure if this is a general convention, but in the projects I worked in, we use it for template files that will be expanded into an actual file by CMake - config headers, pkg-config files etc.

The CMake convention is <file>.suffix.in for the input to configure_file. ( .cpp.in => .cpp )

bdice

Needs a handful of Python improvements. The general approach is much clearer now, with load-pretty-printers.in and the like.

scripts/gdb-pretty-printers.py

bdice

Thanks @upsj!

bdice · 2022-08-26T22:49:12Z

@gpucibot merge

This applies rmm's configured pre-commit hooks to format the gdb pretty printer script that was recently added (#1088). I would like to move rmm to use pre-commit for all style checks (as was recently done for cudf) and this is a prerequisite step. Authors: - Bradley Dice (https://github.com/bdice) Approvers: - GALI PREM SAGAR (https://github.com/galipremsagar) - Mark Harris (https://github.com/harrism) URL: #1127

upsj added 3 commits August 16, 2022 14:23

add pretty-printers

46ef3dc

wip

15bedd1

pull in thrust pretty-printer sources

533774e

upsj requested a review from a team as a code owner August 17, 2022 16:18

github-actions bot added the CMake label Aug 17, 2022

bdice reviewed Aug 17, 2022

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upsj added 3 commits August 17, 2022 18:20

provide script to load pretty-printers

69eb5d2

review updates

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modernize python code

4171b2f

upsj requested a review from bdice August 17, 2022 18:41

consistent quotes

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harrism added feature request New feature or request non-breaking Non-breaking change labels Aug 17, 2022

harrism reviewed Aug 17, 2022

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harrism approved these changes Aug 22, 2022

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bdice reviewed Aug 23, 2022

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upsj added 2 commits August 23, 2022 10:46

review updates

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remove unnecessary error message

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bdice approved these changes Aug 23, 2022

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upsj mentioned this pull request Aug 26, 2022

Add gdb pretty-printers for simple types rapidsai/cudf#11499

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rapids-bot bot merged commit ed43650 into rapidsai:branch-22.10 Aug 26, 2022

bdice mentioned this pull request Oct 7, 2022

Format gdb script. #1127

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Add `gdb` pretty-printers for rmm types #1088

Add `gdb` pretty-printers for rmm types #1088

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bdice commented Aug 26, 2022

		@@ -0,0 +1,2 @@
		source @Thrust_SOURCE_DIR@/scripts/gdb-pretty-printers.py

Add gdb pretty-printers for rmm types #1088

Add gdb pretty-printers for rmm types #1088

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upsj commented Aug 17, 2022 • edited Loading

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bdice commented Aug 26, 2022

Add `gdb` pretty-printers for rmm types #1088

Add `gdb` pretty-printers for rmm types #1088

upsj commented Aug 17, 2022 •

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