|
| 1 | +use { |
| 2 | + memapi2::{helpers::ptr_max_align, prelude::*}, |
| 3 | + std::{ |
| 4 | + env, |
| 5 | + error::Error, |
| 6 | + io::{BufRead, Write, stdin, stdout} |
| 7 | + } |
| 8 | +}; |
| 9 | + |
| 10 | +fn main() { |
| 11 | + let o = stdout(); |
| 12 | + let i = stdin(); |
| 13 | + |
| 14 | + let mut out = o.lock(); |
| 15 | + let mut inp = i.lock(); |
| 16 | + |
| 17 | + let auto = env::args().any(|a| a == "--auto" || a == "-a"); |
| 18 | + |
| 19 | + let a = DefaultAlloc; |
| 20 | + |
| 21 | + let mut total_sizes_tried: u128 = 0; |
| 22 | + let mut total_alloc_attempts: u128 = 0; |
| 23 | + let mut total_successes: u128 = 0; |
| 24 | + let mut total_failures: u128 = 0; |
| 25 | + let mut total_bytes_allocated: u128 = 0; |
| 26 | + let mut max_success_size: usize = 0; |
| 27 | + let mut max_success_align: usize = 0; |
| 28 | + let mut max_success_size_align: usize = 0; |
| 29 | + let mut max_align_attempted: usize = 0; |
| 30 | + |
| 31 | + let mut size = 1; |
| 32 | + let mut align = 1; |
| 33 | + loop { |
| 34 | + total_sizes_tried += 1; |
| 35 | + |
| 36 | + let err: Box<dyn Error> = loop { |
| 37 | + if !auto { |
| 38 | + inp.read_line(&mut String::new()).unwrap(); |
| 39 | + write!(out, "\x1b[1A\x1b[2K").unwrap(); |
| 40 | + out.flush().unwrap(); |
| 41 | + } |
| 42 | + |
| 43 | + // Track an allocation attempt for this size/align pair |
| 44 | + total_alloc_attempts += 1; |
| 45 | + if align > max_align_attempted { |
| 46 | + max_align_attempted = align; |
| 47 | + } |
| 48 | + |
| 49 | + let layout = match Layout::from_size_align(size, align) { |
| 50 | + Ok(layout) => layout, |
| 51 | + Err(e) => { |
| 52 | + total_failures += 1; |
| 53 | + break Box::new(e) |
| 54 | + } |
| 55 | + }; |
| 56 | + |
| 57 | + write!(out, "created Layout(size={}, align={})", layout.size(), layout.align()) |
| 58 | + .unwrap(); |
| 59 | + |
| 60 | + let ptr = a.alloc(layout); |
| 61 | + match ptr { |
| 62 | + Ok(ptr) => { |
| 63 | + total_successes += 1; |
| 64 | + total_bytes_allocated += layout.size() as u128; |
| 65 | + if layout.size() > max_success_size { |
| 66 | + max_success_size = layout.size(); |
| 67 | + max_success_size_align = layout.align(); |
| 68 | + } |
| 69 | + if layout.align() > max_success_align { |
| 70 | + max_success_align = layout.align(); |
| 71 | + } |
| 72 | + |
| 73 | + write!(out, "; allocated ptr={:p}", ptr).unwrap(); |
| 74 | + write!(out, "; aligned_to={}", ptr_max_align(ptr)).unwrap(); |
| 75 | + writeln!(out).unwrap(); |
| 76 | + out.flush().unwrap(); |
| 77 | + |
| 78 | + unsafe { |
| 79 | + a.dealloc(ptr, layout); |
| 80 | + } |
| 81 | + } |
| 82 | + Err(e) => { |
| 83 | + total_failures += 1; |
| 84 | + break Box::new(e) |
| 85 | + } |
| 86 | + } |
| 87 | + |
| 88 | + align *= 2 |
| 89 | + }; |
| 90 | + |
| 91 | + writeln!(out, "Layout({}, {}) failed with error: {}\n", size, align, err).unwrap(); |
| 92 | + if align == 1 { |
| 93 | + // we failed on the first attempt, size is too large. |
| 94 | + break; |
| 95 | + } |
| 96 | + align = 1; |
| 97 | + size += 1; |
| 98 | + } |
| 99 | + |
| 100 | + // Final summary |
| 101 | + let success_rate = if total_alloc_attempts == 0 { |
| 102 | + 0.0 |
| 103 | + } else { |
| 104 | + (total_successes as f64) / (total_alloc_attempts as f64) * 100.0 |
| 105 | + }; |
| 106 | + |
| 107 | + writeln!(out, "=== Final stats ===").unwrap(); |
| 108 | + writeln!(out, "sizes tried: {}", total_sizes_tried).unwrap(); |
| 109 | + writeln!(out, "allocation attempts: {}", total_alloc_attempts).unwrap(); |
| 110 | + writeln!(out, "successes: {}", total_successes).unwrap(); |
| 111 | + writeln!(out, "failures: {}", total_failures).unwrap(); |
| 112 | + writeln!(out, "success rate: {:.2}%", success_rate).unwrap(); |
| 113 | + writeln!(out, "total bytes allocated (sum of successful sizes): {}", total_bytes_allocated).unwrap(); |
| 114 | + writeln!(out, "largest successful size: {}", max_success_size).unwrap(); |
| 115 | + writeln!(out, "largest successful size's largest align: {}", max_success_size_align).unwrap(); |
| 116 | + writeln!(out, "largest successful alignment: {}", max_success_align).unwrap(); |
| 117 | + writeln!(out, "largest alignment attempted: {}", max_align_attempted).unwrap(); |
| 118 | + writeln!(out, "====================").unwrap(); |
| 119 | +} |
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