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30 lines
907 B
Nim
30 lines
907 B
Nim
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import std/[strutils, math, cpuinfo]
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import taskpools
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# From https://github.com/nim-lang/Nim/blob/v1.6.2/tests/parallel/tpi.nim
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# Leibniz Formula https://en.wikipedia.org/wiki/Leibniz_formula_for_%CF%80
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proc term(k: openArray[float]): float =
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for n in k:
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result += n
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proc piApprox(tp: Taskpool, n: int): float =
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var args = newSeq[float]()
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for i in 0..n:
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args[i] = i.toFloat()
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result = tp.spawn term(args) # Schedule a task on the threadpool a return a handle to retrieve the result.
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proc main() =
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var n = 10_000
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var nthreads = countProcessors()
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var tp = Taskpool.new(num_threads = nthreads) # Default to the number of hardware threads.
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echo tp.piApprox(n)
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tp.syncAll() # Block until all pending tasks are processed (implied in tp.shutdown())
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tp.shutdown()
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# Compile with nim c -r -d:release --threads:on --outdir:build example.nim
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main() |