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Author SHA1 Message Date
KOBAYASHI Shuji f2d8db39be Reduce memory usage of Hash object 
## Implementation Summary

* Change entry list from segmented list to flat array.
* Change value of hash bucket from pointer to entry to index of entry list,
  and represent it by variable length bits according to capacity of hash
  buckets.
* Store management information about entry list and hash table to `struct
  RHash` as much as possible.

## Benchmark Summary

Only the results of typical situations on 64-bit Word-boxing are present
here. For more detailed information, including consideration, see below
(although most of the body is written in Japanese).

* https://shuujii.github.io/mruby-hash-benchmark

### Memory Usage

Lower value is better.

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 |          344B |          256B |   0.74419x |
|        40 |        1,464B |          840B |   0.57377x |
|       200 |        8,056B |        3,784B |   0.46971x |
|       500 |       17,169B |        9,944B |   0.57949x |

### Performance

Higher value is better.

#### `mrb_hash_set`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 |  1.41847M i/s |  1.36004M i/s |   0.95881x |
|        40 |  0.39224M i/s |  0.31888M i/s |   0.81296x |
|       200 |  0.03780M i/s |  0.04290M i/s |   1.13494x |
|       500 |  0.01225M i/s |  0.01314M i/s |   1.07275x |

#### `mrb_hash_get`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 | 26.05920M i/s | 30.19543M i/s |   1.15872x |
|        40 | 44.26420M i/s | 32.75781M i/s |   0.74005x |
|       200 | 44.55171M i/s | 31.56926M i/s |   0.70860x |
|       500 | 39.19250M i/s | 29.73806M i/s |   0.75877x |

#### `mrb_hash_each`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 | 25.11964M i/s | 30.34167M i/s |   1.20789x |
|        40 | 11.74253M i/s | 13.25539M i/s |   1.12884x |
|       200 |  2.01133M i/s |  2.97214M i/s |   1.47770x |
|       500 |  0.87411M i/s |  1.21178M i/s |   1.38631x |

#### `Hash#[]=`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 |  0.50095M i/s |  0.56490M i/s |   1.12764x |
|        40 |  0.19132M i/s |  0.18392M i/s |   0.96129x |
|       200 |  0.03624M i/s |  0.03256M i/s |   0.89860x |
|       500 |  0.01527M i/s |  0.01236M i/s |   0.80935x |
#### `Hash#[]`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 | 11.53211M i/s | 12.78806M i/s |   1.10891x |
|        40 | 15.26920M i/s | 13.37529M i/s |   0.87596x |
|       200 | 15.28550M i/s | 13.36410M i/s |   0.87430x |
|       500 | 14.57695M i/s | 12.75388M i/s |   0.87494x |

#### `Hash#each`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 |  0.30462M i/s |  0.27080M i/s |   0.88898x |
|        40 |  0.12912M i/s |  0.11704M i/s |   0.90642x |
|       200 |  0.02638M i/s |  0.02402M i/s |   0.91071x |
|       500 |  0.01066M i/s |  0.00959M i/s |   0.89953x |

#### `Hash#delete`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 |  7.84167M i/s |  6.96419M i/s |   0.88810x |
|        40 |  6.91292M i/s |  7.41427M i/s |   1.07252x |
|       200 |  3.75952M i/s |  7.32080M i/s |   1.94727x |
|       500 |  2.10754M i/s |  7.05963M i/s |   3.34970x |

#### `Hash#shift`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 | 14.66444M i/s | 13.18876M i/s |   0.89937x |
|        40 | 11.95124M i/s | 11.10420M i/s |   0.92913x |
|       200 |  5.53681M i/s |  7.88155M i/s |   1.42348x |
|       500 |  2.96728M i/s |  5.40405M i/s |   1.82121x |

#### `Hash#dup`

| Hash Size |   Baseline    |      New      |   Factor   |
|----------:|--------------:|--------------:|-----------:|
|        16 |  0.15063M i/s |  5.37889M i/s |  35.71024x |
|        40 |  0.06515M i/s |  3.38196M i/s |  51.91279x |
|       200 |  0.01359M i/s |  1.46538M i/s | 107.84056x |
|       500 |  0.00559M i/s |  0.75411M i/s | 134.88057x |

### Binary Size

Lower value is better.

|    File    |   Baseline    |      New      |  Factor   |
|:-----------|--------------:|--------------:|----------:|
| mruby      |      730,408B |      734,176B |  1.00519x |
| libmruby.a |    1,068,134B |    1,072,846B |  1.00441x |

## Other Fixes

The following issues have also been fixed in the parts where there was some
change this time.

* [Heap use-after-free in `Hash#value?`](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-heap-use-after-free-in-hash-value-md)
* [Heap use-after-free in `ht_hash_equal`](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-heap-use-after-free-in-ht_hash_equal-md)
* [Heap use-after-free in `ht_hash_func`](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-heap-use-after-free-in-ht_hash_func-md)
* [Heap use-after-free in `mrb_hash_merge`](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-heap-use-after-free-in-mrb_hash_merge-md)
* [Self-replacement does not work for `Hash#replace`](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-self-replacement-does-not-work-for-hash-replace-md)
* [Repeated deletes and inserts increase memory usage of `Hash`](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-repeated-deletes-and-inserts-increase-memory-usage-of-hash-md)
* [`Hash#rehash` does not reindex completely](https://gist.github.com/shuujii/30e4fcd5844a4112a0ecd4a5b3483101#file-hash-rehash-does-not-reindex-completely-md)
* `mrb_hash_delete_key` does not cause an error for frozen object
* `mrb_hash_new_capa` does not allocate required space first
* [`mrb_os_memsize_of_hash_table` result is incorrect](https://github.com/mruby/mruby/pull/5032#discussion_r457994075)
 2020-11-10 15:21:49 +09:00
Yukihiro "Matz" Matsumoto d605b72c1d Merge branch 'master' into i110/inspect-recursion 2019-07-17 10:35:41 +09:00
KOBAYASHI Shuji fbad7a1595 Use FrozenError instead of RuntimeError in frozen object modification test 2019-03-19 20:48:32 +09:00
Yukihiro "Matz" Matsumoto cca19532c5 Remove Kernel#class_defined? which is not available in CRuby; #3829 2019-01-03 11:34:35 +09:00
Yukihiro "Matz" Matsumoto 82e00ce60f Hash#delete should return the deleted value; fix #4133 2018-10-12 08:25:54 +09:00
Ichito Nagata 2af92d0ebc Let inspect recursion do the right thing 2018-06-04 11:25:10 +09:00
YAMAMOTO Masaya dcd5d0ffec Test for MRB_WITHOUT_FLOAT 2017-10-11 17:58:11 +09:00
Takashi Kokubun 10bb7ad693 Implement Object#freeze 2016-12-11 03:44:15 +09:00
Shugo Maeda 338e0ff52d Copy default_proc by Hash#dup. 2016-12-07 22:39:20 +09:00
Yutaka HARA 3f83ec64a8 Add test for recently fixed bugs 2016-12-01 14:55:26 +09:00
Sayed Abdelhaleem f5f48d9400 protect NoMethodError from calling to_hash in replace 2016-01-27 21:17:33 +02:00
Yukihiro "Matz" Matsumoto 698b3c925d add Hash#rehash to handle key modification; ref #2945 2015-09-10 23:03:53 +09:00
take_cheeze ec5b055694 Move direct superclass checking to test/t/superclass.rb. 2014-06-15 15:02:21 +09:00
Jun Hiroe ab2ce33859 Fix Hash test 2014-05-12 20:47:44 +09:00
yui-knk 658a00ba49 Change to raise TypeError (Hash#merge, #merge!) 2014-05-10 10:18:15 +09:00
Nobuyoshi Nakada ab67c57f65 remove trailing spaces 2014-04-30 09:50:14 +09:00
Yukihiro "Matz" Matsumoto 59cd24d41f Hash#replace should copy default as well; close #2004 2014-04-04 12:14:23 +09:00
Yukihiro "Matz" Matsumoto 8cfd5f17da merge test code from #2003 2014-04-04 11:06:11 +09:00
Yukihiro "Matz" Matsumoto b868ce8a77 Hash#shift may return any entries 2014-03-15 15:01:17 +09:00
ksss d7b179475b fix #1823 2014-03-08 17:51:21 +09:00
ksss cab1f734ef Fix behavior Hash#eql? 2014-03-07 11:08:24 +09:00
Li Yazhou 7ab0506795 add test for Hash#dup 2014-02-14 13:26:19 +08:00
Jun Hiroe 284dc1be09 I fix order of actual and expect test value in hash.rb. 2013-08-02 20:54:21 +09:00
Daniel Bovensiepen b1c309cc87 Improve Hash Tests 2013-06-15 00:54:58 +08:00
Masaki Muranaka 71cc4e13bf Add more test cases for test coverage. 2013-05-08 13:22:35 +09:00
Masaki Muranaka e129a4c8ef Add test cases. 2013-04-02 11:43:30 +09:00
Daniel Bovensiepen 0c2d74020a Add more superclass tests 2012-06-03 23:31:53 +08:00
Daniel Bovensiepen 2c58690df1 Add test cases for Hash 2012-06-02 23:39:00 +08:00
Yukihiro Matsumoto 1ac22054bc remove debug print 2012-05-30 16:25:51 +09:00
Yukihiro Matsumoto a4a48e3da1 specify allocating array size for Hash#values 2012-05-30 16:12:32 +09:00
Daniel Bovensiepen 31e9705022 Add Test cases for Literals, Enumeration, Exceptions and clean line endings 2012-05-29 01:20:46 +08:00
Yukihiro Matsumoto 52b2d092d3 test t/*.rb spacing fix 2012-05-23 12:00:49 +09:00
Daniel Bovensiepen e1e072b800 Fix Hash#shift return value from Hash to Array 2012-05-20 13:18:34 +08:00
Daniel Bovensiepen d45ecc3270 Complete ISO test cases for Hash, Range, String and Symbol 2012-05-19 23:18:42 +08:00