Thread safety option #7
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This slows operation a bit, if you not using thread safe feature,
but not dramatically
```
goos: linux
goarch: amd64
pkg: github.com/myxo/gofs/memory_test
cpu: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
│ old.txt │ new.txt │
│ sec/op │ sec/op vs base │
InMemory/write_to_start_32-8 10.37n ± 4% 11.86n ± 13% +14.42% (p=0.000 n=10)
InMemory/read_at_start_32-8 11.01n ± 9% 12.12n ± 4% +10.13% (p=0.002 n=10)
InMemory/write_cont_32-8 15.68n ± 4% 17.60n ± 4% +12.24% (p=0.000 n=10)
InMemory/read_cont_32-8 12.58n ± 8% 18.12n ± 8% +44.02% (p=0.000 n=10)
InMemory/write_to_start_4096-8 47.00n ± 3% 51.26n ± 8% +9.05% (p=0.003 n=10)
InMemory/read_at_start_4096-8 45.85n ± 3% 46.82n ± 3% ~ (p=0.247 n=10)
InMemory/write_cont_4096-8 49.68n ± 7% 55.20n ± 4% +11.12% (p=0.000 n=10)
InMemory/read_cont_4096-8 49.31n ± 20% 53.28n ± 5% +8.04% (p=0.043 n=10)
InMemory/write_to_start_65536-8 1.511µ ± 7% 1.455µ ± 4% ~ (p=0.225 n=10)
InMemory/read_at_start_65536-8 1.392µ ± 5% 1.435µ ± 8% +3.05% (p=0.030 n=10)
InMemory/write_cont_65536-8 1.482µ ± 7% 1.520µ ± 6% ~ (p=0.403 n=10)
InMemory/read_cont_65536-8 1.403µ ± 9% 1.465µ ± 4% ~ (p=0.101 n=10)
InMemory/readDir-8 325.2n ± 2% 354.9n ± 8% +9.12% (p=0.022 n=10)
InMemory/readDir_file-8 194.4n ± 10% 213.9n ± 3% +10.03% (p=0.029 n=10)
geomean 108.9n 119.0n +9.30%
│ old.txt │ new.txt │
│ B/s │ B/s vs base │
InMemory/write_to_start_32-8 2.875Gi ± 4% 2.513Gi ± 11% -12.61% (p=0.000 n=10)
InMemory/read_at_start_32-8 2.706Gi ± 9% 2.458Gi ± 4% -9.16% (p=0.002 n=10)
InMemory/write_cont_32-8 1.901Gi ± 4% 1.693Gi ± 4% -10.92% (p=0.000 n=10)
InMemory/read_cont_32-8 2.369Gi ± 9% 1.644Gi ± 9% -30.59% (p=0.000 n=10)
InMemory/write_to_start_4096-8 81.16Gi ± 3% 74.44Gi ± 8% -8.28% (p=0.003 n=10)
InMemory/read_at_start_4096-8 83.19Gi ± 3% 81.48Gi ± 3% ~ (p=0.247 n=10)
InMemory/write_cont_4096-8 76.79Gi ± 7% 69.10Gi ± 3% -10.01% (p=0.000 n=10)
InMemory/read_cont_4096-8 77.35Gi ± 17% 71.60Gi ± 5% -7.44% (p=0.043 n=10)
InMemory/write_to_start_65536-8 40.40Gi ± 7% 41.95Gi ± 4% ~ (p=0.218 n=10)
InMemory/read_at_start_65536-8 43.83Gi ± 4% 42.55Gi ± 7% -2.93% (p=0.035 n=10)
InMemory/write_cont_65536-8 41.20Gi ± 6% 40.15Gi ± 7% ~ (p=0.393 n=10)
InMemory/read_cont_65536-8 43.51Gi ± 8% 41.68Gi ± 4% ~ (p=0.105 n=10)
geomean 20.14Gi 18.44Gi -8.47%
│ old.txt │ new.txt │
│ B/op │ B/op vs base │
InMemory/write_to_start_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_at_start_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_cont_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_cont_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_to_start_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_at_start_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_cont_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_cont_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_to_start_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_at_start_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_cont_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_cont_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/readDir-8 200.0 ± 0% 216.0 ± 0% +8.00% (p=0.000 n=10)
InMemory/readDir_file-8 88.00 ± 0% 88.00 ± 0% ~ (p=1.000 n=10) ¹
geomean ² +0.55% ²
¹ all samples are equal
² summaries must be >0 to compute geomean
│ old.txt │ new.txt │
│ allocs/op │ allocs/op vs base │
InMemory/write_to_start_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_at_start_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_cont_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_cont_32-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_to_start_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_at_start_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_cont_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_cont_4096-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_to_start_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_at_start_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/write_cont_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/read_cont_65536-8 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/readDir-8 5.000 ± 0% 5.000 ± 0% ~ (p=1.000 n=10) ¹
InMemory/readDir_file-8 3.000 ± 0% 3.000 ± 0% ~ (p=1.000 n=10) ¹
geomean ² +0.00% ²
¹ all samples are equal
² summaries must be >0 to compute geomean
```
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