Numba runtime/driver calls when compiling to PTX

compile_to_ptx.py

from numba import cuda, types
import time

def add(r, x, y):
    i = cuda.grid(1)

    if i < len(r):
        r[i] = x[i] + y[i]


def sub(r, x, y):
    i = cuda.grid(1)

    if i < len(r):
        r[i] = x[i] - y[i]

arg_types = (types.float64[::1], types.float64[::1], types.float64[::1])
cc = (7, 5)

print("Compile to PTX")
cuda.compile_ptx(add, arg_types)

print("Compile to PTX for current device")
cuda.compile_ptx_for_current_device(sub, arg_types)

output.txt

$ NUMBA_CUDA_LOG_LEVEL=DEBUG python compile_to_ptx.py 
== CUDA [181] DEBUG -- call runtime api: cudaRuntimeGetVersion
Compile to PTX
Compile to PTX for current device
== CUDA [292]  INFO -- init
== CUDA [292] DEBUG -- call driver api: cuInit
== CUDA [292] DEBUG -- call driver api: cuCtxGetCurrent
== CUDA [292] DEBUG -- call driver api: cuDeviceGetCount
== CUDA [292] DEBUG -- call driver api: cuDeviceGet
== CUDA [292] DEBUG -- call driver api: cuDeviceComputeCapability
== CUDA [292] DEBUG -- call driver api: cuDeviceGetName
== CUDA [293] DEBUG -- call driver api: cuDevicePrimaryCtxRetain
== CUDA [398] DEBUG -- call driver api: cuCtxPushCurrent_v2
== CUDA [398] DEBUG -- call driver api: cuMemGetInfo_v2