Awesome

oclkit, plain and stupid OpenCL helper

oclkit is a small set of C functions, to avoid writing the same OpenCL boiler plate over and over again, yet keeping full control over executing OpenCL. It also contains a set of binaries to check and test for the installed OpenCL runtime.

API

The API should be pretty self-explanatory by examining ocl.h.

Binaries

Run make in the top-level directory and change into build/examples. Most binaries are compiled with command-line flags to chose the OpenCL platform and device type.

check-infrastructure-times

Measures the time for typical boilerplate operations such as clCreateContext, clBuildProgram etc.

$ ./check-infrastructure-times

Create context: 0.150983 s
Build program : 0.002060 s
Create kernel : 0.000004 s
Create buffer : 0.000003 s
Cleanup       : 0.061502 s

check-launch-latencies

Runs a dummy kernel and measures the OpenCL profiling times and wall clock time for submission and execution.

$ ./check-launch-latencies

GeForce GTX TITAN Black
  wait for submission:  2.88220 us
  wait for execution :  7.48316 us
  wall clock         : 22.12242 us

GeForce GTX 580
  wait for submission:  2.38133 us
  wait for execution :  4.08007 us
  wall clock         : 16.33144 us

check-queue-impact

Uses a single blocking, an out-of-order, two or three queues to write data, execute a kernel and read back data. The total

test-profile-timer

Outputs the queue profiling timer resolution for each device.

$ ./test-profile-timer

GeForce GTX TITAN Black       : 1000 ns
GeForce GTX 580               : 1000 ns

test-double-flags

Outputs the double extension flags for each device.

$ ./test-double-flags


GeForce GTX TITAN Black
  cl_khr_fp64 = 1
  cl_amd_fp64 = 0

GeForce GTX 580
  cl_khr_fp64 = 1
  cl_amd_fp64 = 0

dump-opencl-binary

Outputs the compiled binary (which might be PTX assembly for NVIDIA GPUs) for each device by appending a counter, i.e.

$ ./dump-opencl-binary test.cl

Generates output files test.cl.0, .test.cl.1 etc.

License

The code is licensed under GPL v3.