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Fix RepeatedKernelRetrieval warning in cl_hash_iterations #718

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Fix RepeatedKernelRetrieval warning in cl_hash_iterations #718

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8f605da
Fix RepeatedKernelRetrieval warning in cl_hash_iterations
MasterGerhard May 12, 2026
fd6b551
Merge branch '3rdIteration:master' into fix-hash-iterations-kernel-cache
MasterGerhard Jun 6, 2026
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11 changes: 10 additions & 1 deletion lib/opencl_brute/opencl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1046,8 +1046,17 @@ def cl_hash_iterations(self, ctx, passwordlist, iters, hash_size):
prg = ctx[0]
bufStructs = ctx[1]

# `prg.hash_iterations` creates a new kernel instance every time it is
# accessed, which is expensive and triggers pyopencl's
# RepeatedKernelRetrieval warning. Cache the kernel on the compiled
# program so that subsequent calls reuse the same object.
hash_iterations_kernel = getattr(prg, "_hash_iterations_kernel", None)
if hash_iterations_kernel is None:
hash_iterations_kernel = cl.Kernel(prg, "hash_iterations")
setattr(prg, "_hash_iterations_kernel", hash_iterations_kernel)

def func(s, pwdim, pass_g, salt_g, result_g):
prg.hash_iterations(
hash_iterations_kernel(
s.queue,
pwdim,
None,
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