Percentage of allocs less than 48 bytes: 92.0

All allocations
# A tibble: 22 × 4
   obj_len     n n_less_than percent
     <int> <int>       <int>   <dbl>
 1       9    39          39  0.0244
 2      10     2          41  0.0257
 3      11  2005        2046  1.28  
 4      12     1        2047  1.28  
 5      16 14763       16810 10.5   
 6      18   314       17124 10.7   
 7      19  2366       19490 12.2   
 8      20  3615       23105 14.5   
 9      21  4076       27181 17.0   
10      22  1036       28217 17.7   
11      23  1025       29242 18.3   
12      24 51158       80400 50.3   
13      25  1059       81459 51.0   
14      26  4045       85504 53.5   
15      27    32       85536 53.5   
16      28    26       85562 53.5   
17      29    29       85591 53.6   
18      30    26       85617 53.6   
19      31    17       85634 53.6   
20      32 14255       99889 62.5   
21      33    10       99899 62.5   
22      34     3       99902 62.5   
# A tibble: 5 × 4
  obj_len     n n_less_than percent
    <int> <int>       <int>   <dbl>
1    1024     8      159771    100.
2    1032     6      159777    100.
3    1041     1      159778    100.
4    4096     2      159780    100.
5    4113     2      159782    100 

Common Sizes
# A tibble: 8 × 2
  obj_len     n
    <int> <int>
1      24 51158
2      48 42988
3      16 14763
4      32 14255
5      64  4165
6      40  4108
7      21  4076
8      26  4045

    159,782 total allocations, total bytes = 6,304,689

Typed allocations
# A tibble: 20 × 3
   func_name                                                           n percent
   <chr>                                                           <int>   <dbl>
 1 List<BigStr*>* Alloc<List<BigStr*>>()                           10089   11.3 
 2 List<runtime_asdl::part_value_t*>* Alloc<List<runtime_asdl::pa…  8010    8.95
 3 runtime_asdl::CommandStatus* Alloc<runtime_asdl::CommandStatus…  5010    5.60
 4 runtime_asdl::Piece* Alloc<runtime_asdl::Piece, BigStr*, bool&…  5003    5.59
 5 List<syntax_asdl::CompoundWord*>* Alloc<List<syntax_asdl::Comp…  4043    4.52
 6 syntax_asdl::word__String* Alloc<syntax_asdl::word__String, in…  4004    4.48
 7 List<int>* Alloc<List<int>>()                                    3021    3.38
 8 mylib::BufWriter* Alloc<mylib::BufWriter>()                      3007    3.36
 9 List<List<runtime_asdl::Piece*>*>* Alloc<List<List<runtime_asd…  3004    3.36
10 List<runtime_asdl::Piece*>* Alloc<List<runtime_asdl::Piece*>>()  3004    3.36
11 List<Tuple2<runtime_asdl::span_e, int>*>* Alloc<List<Tuple2<ru…  3002    3.36
12 List<mylib::BufWriter*>* Alloc<List<mylib::BufWriter*>>()        3002    3.36
13 Tuple2<runtime_asdl::span_e, int>* Alloc<Tuple2<runtime_asdl::…  3002    3.36
14 value_asdl::value__Str* Alloc<value_asdl::value__Str, BigStr*&…  2046    2.29
15 runtime_asdl::VarSubState* Alloc<runtime_asdl::VarSubState, bo…  2005    2.24
16 runtime_asdl::cmd_value__Argv* Alloc<runtime_asdl::cmd_value__…  2004    2.24
17 value_asdl::value__Str* Alloc<value_asdl::value__Str, BigStr*>…  2004    2.24
18 runtime_asdl::Piece* Alloc<runtime_asdl::Piece, BigStr*&, bool…  2003    2.24
19 syntax_asdl::loc__Word* Alloc<syntax_asdl::loc__Word, syntax_a…  2002    2.24
20 syntax_asdl::loc__Arith* Alloc<syntax_asdl::loc__Arith, syntax…  2000    2.24
# A tibble: 5 × 3
  func_name                                                            n percent
  <chr>                                                            <int>   <dbl>
1 value_asdl::value__Proc* Alloc<value_asdl::value__Proc, BigStr*…     1 0.00112
2 word_eval::CompletionWordEvaluator* Alloc<word_eval::Completion…     1 0.00112
3 word_eval::NormalWordEvaluator* Alloc<word_eval::NormalWordEval…     1 0.00112
4 word_eval::TildeEvaluator* Alloc<word_eval::TildeEvaluator, sta…     1 0.00112
5 word_parse::WordParser* Alloc<word_parse::WordParser, parse_lib…     1 0.00112

89,466 typed allocs, including 41,733 List<T>
55.99% of allocs are typed

Str - NewStr() and OverAllocatedStr()
# A tibble: 16 × 4
   str_len     n n_less_than percent
     <int> <int>       <int>   <dbl>
 1       1   314         314    1.76
 2       2  2366        2680   15.1 
 3       3  3615        6295   35.4 
 4       4  4076       10371   58.3 
 5       5  1036       11407   64.1 
 6       6  1025       12432   69.8 
 7       7    53       12485   70.1 
 8       8  1059       13544   76.1 
 9       9  4045       17589   98.8 
10      10    32       17621   99.0 
11      11    17       17638   99.1 
12      12    29       17667   99.3 
13      13    26       17693   99.4 
14      14    17       17710   99.5 
15      15     7       17717   99.5 
16      16    10       17727   99.6 
# A tibble: 5 × 4
  str_len     n n_less_than percent
    <int> <int>       <int>   <dbl>
1     134     1       17794    100.
2     202     1       17795    100.
3     255     1       17796    100.
4    1024     1       17797    100.
5    4096     2       17799    100 

17,799 string allocations, total length = 102,508, total bytes = 405,091

11.14% of allocs are strings
6.43% of bytes are strings

NewSlab()
  Lengths
# A tibble: 6 × 4
  slab_len     n n_less_than percent
     <int> <int>       <int>   <dbl>
1        5 36662       36662    69.8
2        7  3076       39738    75.7
3        8  1044       40782    77.7
4       10  3153       43935    83.7
5       14    78       44013    83.8
6       15  2064       46077    87.7
# A tibble: 5 × 4
  slab_len     n n_less_than percent
     <int> <int>       <int>   <dbl>
1      127    11       52472    99.9
2      128    36       52508   100. 
3      254     1       52509   100. 
4      256     6       52515   100. 
5     1022     2       52517   100  

  Slab Types
# A tibble: 6 × 2
  func_name                                                                    n
  <chr>                                                                    <int>
1 Slab<BigStr*>* NewSlab<BigStr*>(int)                                     18191
2 Slab<runtime_asdl::part_value_t*>* NewSlab<runtime_asdl::part_value_t*>…  8010
3 Slab<int>* NewSlab<int>(int)                                              7695
4 Slab<syntax_asdl::CompoundWord*>* NewSlab<syntax_asdl::CompoundWord*>(i…  5033
5 Slab<List<runtime_asdl::Piece*>*>* NewSlab<List<runtime_asdl::Piece*>*>…  3004
6 Slab<runtime_asdl::Piece*>* NewSlab<runtime_asdl::Piece*>(int)            3003
# A tibble: 5 × 2
  func_name                                                                    n
  <chr>                                                                    <int>
1 Slab<syntax_asdl::loc_t*>* NewSlab<syntax_asdl::loc_t*>(int)                 1
2 Slab<value_asdl::regex_match_t*>* NewSlab<value_asdl::regex_match_t*>(i…     1
3 Slab<value_asdl::value__Dict*>* NewSlab<value_asdl::value__Dict*>(int)       1
4 Slab<value_asdl::value__Proc*>* NewSlab<value_asdl::value__Proc*>(int)       1
5 Slab<vm::_AssignBuiltin*>* NewSlab<vm::_AssignBuiltin*>(int)                 1

52,517 slabs, total items = 515,179
32.87% of allocs are slabs

::reserve(int n)

  Num Items
# A tibble: 15 × 4
   num_items     n n_less_than  percent
       <int> <int>       <int>    <dbl>
 1         0     9           9  0.00954
 2         1 46592       46601 49.4    
 3         2 13221       59822 63.4    
 4         3 10027       69849 74.1    
 5         4 11087       80936 85.8    
 6         5  5048       85984 91.2    
 7         6  3055       89039 94.4    
 8         7  1017       90056 95.5    
 9         8  2035       92091 97.7    
10         9  1013       93104 98.7    
11        10     8       93112 98.7    
12        11    46       93158 98.8    
13        12     7       93165 98.8    
14        13     5       93170 98.8    
15        14     6       93176 98.8    
# A tibble: 5 × 4
  num_items     n n_less_than percent
      <int> <int>       <int>   <dbl>
1        63     1       94285    100.
2        64     5       94290    100.
3       113     2       94292    100.
4       179     1       94293    100.
5      1022     2       94295    100 

94,295 reserve() calls, total items = 245,550

Untyped: 159,782
Typed + Str + Slab: 159,782