[Openmp-commits] [PATCH] D106752: [OpenMP][Tool] Introducing the `llvm-deviceinfo` tool

[Jose Manuel Monsalve Diaz via Phabricator via Openmp-commits]

josemonsalve2 created this revision.
Herald added subscribers: guansong, yaxunl, mgorny.
josemonsalve2 requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added subscribers: openmp-commits, sstefan1.
Herald added a project: OpenMP.

This patch introduces the `llvm-deviceinfo` tool, which uses the
omptarget library and interface to query the device info from all the
available devices as seen by OpenMP. This is inspired by PGI's `pgaccelinfo`

Since omptarget usually requires a description structure with executable
kernels, I split the initialization of the RTLs and Devices to be able to
initialize all possible devices and query each of them.

This revision relies on the patch that introduces the print device info.

A limitation is that the order in which the devices are initialized, and the
corresponding device ID is not necesarily the one seen by OpenMP.

The changes are as follows:

1. Separate the RTL initialization that was performed in `RegisterLib` to its own `initRTLonce` function
2. Create an `initAllRTLs` method that initializes all available RTLs at runtime
3. Created the `llvm-deviceinfo.cpp` tool that uses `omptarget` to query each device and prints its information.

Example Output:

  Device (0):
      print_device_info not implemented
  
  Device (1):
      print_device_info not implemented
  
  Device (2):
      print_device_info not implemented
  
  Device (3):
      print_device_info not implemented
  
  Device (4):
      CUDA Driver Version:                11000
      CUDA Device Number:                 0
      Device Name:                        Quadro P1000
      Global Memory Size:                 4236312576 bytes
      Number of Multiprocessors:          5
      Concurrent Copy and Execution:      Yes
      Total Constant Memory:              65536 bytes
      Max Shared Memory per Block:        49152 bytes
      Registers per Block:                65536
      Warp Size:                          32 Threads
      Maximum Threads per Block:          1024
      Maximum Block Dimensions:           1024, 1024, 64
      Maximum Grid Dimensions:            2147483647 x 65535 x 65535
      Maximum Memory Pitch:               2147483647 bytes
      Texture Alignment:                  512 bytes
      Clock Rate:                         1480500 kHz
      Execution Timeout:                  Yes
      Integrated Device:                  No
      Can Map Host Memory:                Yes
      Compute Mode:                       DEFAULT
      Concurrent Kernels:                 Yes
      ECC Enabled:                        No
      Memory Clock Rate:                  2505000 kHz
      Memory Bus Width:                   128 bits
      L2 Cache Size:                      1048576 bytes
      Max Threads Per SMP:                2048
      Async Engines:                      Yes (2)
      Unified Addressing:                 Yes
      Managed Memory:                     Yes
      Concurrent Managed Memory:          Yes
      Preemption Supported:               Yes
      Cooperative Launch:                 Yes
      Multi-Device Boars:                 No
      Compute Capabilities:               61


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106752

Files:
  openmp/libomptarget/CMakeLists.txt
  openmp/libomptarget/include/omptarget.h
  openmp/libomptarget/plugins/cuda/CMakeLists.txt
  openmp/libomptarget/src/exports
  openmp/libomptarget/src/interface.cpp
  openmp/libomptarget/src/rtl.cpp
  openmp/libomptarget/src/rtl.h
  openmp/libomptarget/tools/CMakeLists.txt
  openmp/libomptarget/tools/deviceinfo/CMakeLists.txt
  openmp/libomptarget/tools/deviceinfo/llvm-deviceinfo.cpp

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