perf(fs/mem): remove Arc around file positions

[mkroening]

Extracted from #2078.

[mkroening]

Thanks for this, @fogti! :)

[github-actions]

Benchmark Results

Details

Benchmark	Current: 98b7527	Previous: f250a72	Performance Ratio
startup_benchmark Build Time	117.93 s	114.41 s	1.03
startup_benchmark File Size	0.91 MB	0.91 MB	0.99
Startup Time - 1 core	1.01 s (±0.02 s)	0.98 s (±0.03 s)	1.03
Startup Time - 2 cores	1.02 s (±0.02 s)	0.97 s (±0.03 s)	1.05
Startup Time - 4 cores	1.03 s (±0.02 s)	0.98 s (±0.02 s)	1.05
multithreaded_benchmark Build Time	118.77 s	113.19 s	1.05
multithreaded_benchmark File Size	1.02 MB	1.02 MB	1.00
Multithreaded Pi Efficiency - 2 Threads	87.66 % (±7.76 %)	87.29 % (±8.93 %)	1.00
Multithreaded Pi Efficiency - 4 Threads	43.80 % (±3.01 %)	44.54 % (±3.35 %)	0.98
Multithreaded Pi Efficiency - 8 Threads	25.03 % (±1.48 %)	25.47 % (±2.04 %)	0.98
micro_benchmarks Build Time	324.16 s	309.36 s	1.05
micro_benchmarks File Size	1.02 MB	1.02 MB	1.00
Scheduling time - 1 thread	198.41 ticks (±38.50 ticks)	187.65 ticks (±29.91 ticks)	1.06
Scheduling time - 2 threads	109.12 ticks (±19.92 ticks)	104.76 ticks (±17.67 ticks)	1.04
Micro - Time for syscall (getpid)	11.78 ticks (±4.75 ticks)	10.70 ticks (±5.34 ticks)	1.10
Memcpy speed - (built_in) block size 4096	54925.67 MByte/s (±40202.94 MByte/s)	54842.67 MByte/s (±40303.19 MByte/s)	1.00
Memcpy speed - (built_in) block size 1048576	13933.17 MByte/s (±11582.93 MByte/s)	13435.52 MByte/s (±11081.00 MByte/s)	1.04
Memcpy speed - (built_in) block size 16777216	6641.45 MByte/s (±5314.56 MByte/s)	8827.85 MByte/s (±7024.29 MByte/s)	0.75
Memset speed - (built_in) block size 4096	55164.47 MByte/s (±40376.58 MByte/s)	55412.19 MByte/s (±40719.84 MByte/s)	1.00
Memset speed - (built_in) block size 1048576	14325.76 MByte/s (±11839.74 MByte/s)	13825.19 MByte/s (±11354.50 MByte/s)	1.04
Memset speed - (built_in) block size 16777216	6801.85 MByte/s (±5423.89 MByte/s)	9064.78 MByte/s (±7183.52 MByte/s)	0.75
Memcpy speed - (rust) block size 4096	47450.35 MByte/s (±35213.86 MByte/s)	46733.78 MByte/s (±35123.32 MByte/s)	1.02
Memcpy speed - (rust) block size 1048576	13239.71 MByte/s (±10934.73 MByte/s)	13310.91 MByte/s (±11037.27 MByte/s)	0.99
Memcpy speed - (rust) block size 16777216	6723.99 MByte/s (±5353.64 MByte/s)	8766.51 MByte/s (±6990.65 MByte/s)	0.77
Memset speed - (rust) block size 4096	48074.84 MByte/s (±35582.50 MByte/s)	47375.28 MByte/s (±35607.36 MByte/s)	1.01
Memset speed - (rust) block size 1048576	13631.44 MByte/s (±11171.75 MByte/s)	13688.04 MByte/s (±11281.91 MByte/s)	1.00
Memset speed - (rust) block size 16777216	6940.60 MByte/s (±5532.46 MByte/s)	8977.13 MByte/s (±7121.99 MByte/s)	0.77
alloc_benchmarks Build Time	326.74 s	306.61 s	1.07
alloc_benchmarks File Size	0.98 MB	0.98 MB	0.99
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	27319.69 Ticks (±1705.15 Ticks)	29955.30 Ticks (±1520.78 Ticks)	0.91
Allocations - Average Allocation time (no fail)	27319.69 Ticks (±1705.15 Ticks)	29955.30 Ticks (±1520.78 Ticks)	0.91
Allocations - Average Deallocation time	3073.96 Ticks (±972.52 Ticks)	3417.72 Ticks (±1315.22 Ticks)	0.90
mutex_benchmark Build Time	320.68 s	309.20 s	1.04
mutex_benchmark File Size	1.02 MB	1.02 MB	1.00
Mutex Stress Test Average Time per Iteration - 1 Threads	39.36 ns (±2.96 ns)	38.04 ns (±4.45 ns)	1.03
Mutex Stress Test Average Time per Iteration - 2 Threads	33.66 ns (±3.36 ns)	31.30 ns (±2.92 ns)	1.08

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