OptionVsValueOption.fs

open BenchmarkDotNet.Attributes
open BenchmarkDotNet.Running

type Rec = {N: int}

[<MemoryDiagnoser>]
type Tests() =

    [<Benchmark(Baseline=true)>]
    member _.OptionSomeRec() = 
        seq {
            for i = 1 to 1000 do
                Some {N = 1}
        } |> Seq.toArray

    [<Benchmark>]
    member _.VoptionSomeRec() = 
        seq {
            for i = 1 to 1000 do
                ValueSome {N = 1}
        } |> Seq.toArray

    [<Benchmark>]
    member _.OptionNoneRec() = 
        seq {
            for i = 1 to 1000 do
                None
        } |> Seq.toArray<Option<Rec>>

    [<Benchmark>]
    member _.VoptionNoneRec() = 
        seq {
            for i = 1 to 1000 do
                ValueNone
        } |> Seq.toArray<ValueOption<Rec>>

    [<Benchmark>]
    member _.OptionSomeInt() = 
        seq {
            for i = 1 to 1000 do
                Some 1
        } |> Seq.toArray

    [<Benchmark>]
    member _.VoptionSomeInt() = 
        seq {
            for i = 1 to 1000 do
                ValueSome 1
        } |> Seq.toArray

    [<Benchmark>]
    member _.OptionNoneInt() = 
        seq {
            for i = 1 to 1000 do
                None
        } |> Seq.toArray<Option<Rec>>

    [<Benchmark>]
    member _.VoptionNoneInt() = 
        seq {
            for i = 1 to 1000 do
                ValueNone
        } |> Seq.toArray<ValueOption<Rec>>
        
[<EntryPoint>]
let main argv =
    BenchmarkRunner.Run<Tests>() |> ignore
    0

Result.md

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.18363.815 (1909/November2018Update/19H2)
Intel Core i7-4771 CPU 3.50GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=3.1.201
  [Host]     : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT DEBUG
  DefaultJob : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT

Method	Mean	Error	StdDev	Median	Ratio	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
OptionSomeRec	32.64 μs	0.395 μs	0.369 μs	32.57 μs	1.00	0.00	17.3340	0.0610	-	71.11 KB
VoptionSomeRec	31.85 μs	0.202 μs	0.179 μs	31.83 μs	0.98	0.02	17.3950	0.0610	-	71.47 KB
OptionNoneRec	20.00 μs	0.224 μs	0.210 μs	20.03 μs	0.61	0.01	5.9204	0.0305	-	24.23 KB
VoptionNoneRec	22.53 μs	0.155 μs	0.130 μs	22.48 μs	0.69	0.01	11.7188	-	-	48.03 KB
OptionSomeInt	22.52 μs	0.127 μs	0.125 μs	22.52 μs	0.69	0.01	11.6577	-	-	47.67 KB
VoptionSomeInt	18.51 μs	0.368 μs	0.937 μs	17.87 μs	0.59	0.03	5.9204	0.0305	-	24.23 KB
OptionNoneInt	18.04 μs	0.072 μs	0.060 μs	18.02 μs	0.55	0.01	5.9204	0.0305	-	24.23 KB
VoptionNoneInt	25.08 μs	0.499 μs	1.392 μs	26.01 μs	0.77	0.04	11.7188	-	-	48.03 KB