scinim / nimcl

High level wrapper over OpenCL

Nim OpenCL utilities

This is an attempt at a high level wrapper over OpenCL.

For now, things are added when needed and as such, they may not be perfectly coherent. Still, they should be enough to cover the simplest cases and get started.

Some API changes can also be expected as the library becomes more comprehensive.

Vector add example

The "hello, world!" of OpenCL:

const
  body = staticRead("vadd.cl")
  size = 1_000_000
var
  a = newSeq[float32](size)
  b = newSeq[float32](size)
  c = newSeq[float32](size)

for i in 0 .. a.high:
  a[i] = i.float32
  b[i] = (i * i).float32

let
  (device, context, queue) = singleDeviceDefaults()
  program = context.createAndBuild(body, device)
  add = program.createKernel("add_vector")
  gpuA = context.bufferLike(a)
  gpuB = context.bufferLike(b)
  gpuC = context.bufferLike(c)

add.args(gpuA, gpuB, gpuC, size.int32)

queue.write(a, gpuA)
queue.write(b, gpuB)
queue.run(add, size)
queue.read(c, gpuC)

echo c[1 .. 100]

# Clean up
release(queue)
release(add)
release(program)
release(gpuA)
release(gpuB)
release(gpuC)
release(context)

The kernel is just

__kernel void add_vector(__global float* a, __global float* b, __global float* c, int num_els) {
  int idx = get_global_id(0);
  if (idx < num_els) {
    c[idx] = a[idx] + b[idx];
  }
}

nimcl's Issues

`nimble install nimcl` fails

Just tried installing arraymancer which tried to install this package. Doesn't work with Nim @ #head.

# Windows

Downloading https://github.com/unicredit/nimcl using git
Error: unhandled exception: The process cannot access the file because it is being used by another process.
 [OSError]

# Linux

Downloading https://github.com/unicredit/nimcl using git
       Tip: 63 messages have been suppressed, use --verbose to show them.
     Error: Could not read package info file in /tmp/nimble_25895/githubcom_unicreditnimcl_0.1.2/nimcl.nimble;
        ...   Reading as ini file failed with:
        ...     Invalid section: .
        ...   Evaluating as NimScript file failed with:
        ...     tmp/nimble_25895/githubcom_unicreditnimcl_0.1.2/nimcl.nimble(11, 37) Error: undeclared identifier: 'stmt'.