[jounathaen]

From https://man7.org/linux/man-pages/man2/dup.2.html:

If the file descriptor newfd was previously open, it is closed before being reused; the close is performed silently (i.e., any errors during the close are not reported by dup2()).

[github-actions]

Benchmark Results

Details

Benchmark	Current: add8c66	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	87.32 s	80.34 s	1.09 ❗
startup_benchmark File Size	0.81 MB	0.80 MB	1.01 ❗
Startup Time - 1 core	0.74 s (±0.03 s)	0.75 s (±0.02 s)	0.99
Startup Time - 2 cores	0.73 s (±0.02 s)	0.74 s (±0.02 s)	1.00
Startup Time - 4 cores	0.74 s (±0.02 s)	0.74 s (±0.02 s)	0.99
multithreaded_benchmark Build Time	89.67 s	82.11 s	1.09 ❗
multithreaded_benchmark File Size	0.94 MB	0.86 MB	1.09 ❗
Multithreaded Pi Efficiency - 2 Threads	89.13 % (±9.26 %)	85.89 % (±6.61 %)	1.04
Multithreaded Pi Efficiency - 4 Threads	44.11 % (±2.95 %)	43.43 % (±2.56 %)	1.02
Multithreaded Pi Efficiency - 8 Threads	25.36 % (±1.82 %)	25.76 % (±1.53 %)	0.98
micro_benchmarks Build Time	88.54 s	80.40 s	1.10 ❗
micro_benchmarks File Size	0.94 MB	0.86 MB	1.09 ❗
Scheduling time - 1 thread	67.22 ticks (±2.84 ticks)	62.65 ticks (±4.06 ticks)	1.07
Scheduling time - 2 threads	37.63 ticks (±4.81 ticks)	34.08 ticks (±4.10 ticks)	1.10
Micro - Time for syscall (getpid)	4.42 ticks (±0.84 ticks)	3.45 ticks (±0.58 ticks)	1.28
Memcpy speed - (built_in) block size 4096	79860.93 MByte/s (±55429.43 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.97
Memcpy speed - (built_in) block size 1048576	30192.20 MByte/s (±24322.69 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.99
Memcpy speed - (built_in) block size 16777216	26030.44 MByte/s (±21636.52 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	0.99
Memset speed - (built_in) block size 4096	80340.84 MByte/s (±55754.64 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.98
Memset speed - (built_in) block size 1048576	30868.04 MByte/s (±24733.41 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.99
Memset speed - (built_in) block size 16777216	26796.56 MByte/s (±22127.73 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	0.99
Memcpy speed - (rust) block size 4096	71125.77 MByte/s (±49685.31 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	0.96
Memcpy speed - (rust) block size 1048576	29974.39 MByte/s (±24354.30 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	0.99
Memcpy speed - (rust) block size 16777216	27280.05 MByte/s (±22567.62 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.99
Memset speed - (rust) block size 4096	71560.16 MByte/s (±50015.31 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	0.96
Memset speed - (rust) block size 1048576	30708.86 MByte/s (±24775.83 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	0.99
Memset speed - (rust) block size 16777216	28046.09 MByte/s (±23036.51 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.99
alloc_benchmarks Build Time	83.47 s	74.76 s	1.12 ❗
alloc_benchmarks File Size	0.89 MB	0.87 MB	1.01 ❗
Allocations - Allocation success	91.37 %	91.31 %	1.00 ❗
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.61 %	61.44 %	1.00 ❗
Allocations - Average Allocation time	6408.18 Ticks (±144.00 Ticks)	5860.58 Ticks (±98.43 Ticks)	1.09 ❗
Allocations - Average Allocation time (no fail)	6995.87 Ticks (±169.24 Ticks)	6554.81 Ticks (±92.86 Ticks)	1.07 ❗
Allocations - Average Deallocation time	1434.57 Ticks (±333.66 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.79
mutex_benchmark Build Time	84.27 s	79.82 s	1.06 ❗
mutex_benchmark File Size	0.94 MB	0.86 MB	1.09 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.24 ns (±0.47 ns)	12.10 ns (±0.41 ns)	1.01
Mutex Stress Test Average Time per Iteration - 2 Threads	69.68 ns (±3.44 ns)	40.26 ns (±1.68 ns)	1.73 ❗

This comment was automatically generated by workflow using github-action-benchmark.

[mkroening]

Introduced in 5bec244.

LGTM 👍