Add Operation Transformation approach

[dmonad]

More or less the expected results. OT dominates when no transformations are involved. Yjs performs better when operations need to be transformed ([B2]).

TODO

• There is a bug with unicode offsets. See otHelpters.js#OTDoc.transformOpsAndApply
• I added several @todo notes

Preliminary results

@josephg

N = 6000	Yjs	Automerge	delta-crdts	OT
Version	13.3.0	0.14.1	0.10.3	4.0.0
Bundle size	65923 bytes	259763 bytes	227573 bytes	10540 bytes
Bundle size (gzipped)	19377 bytes	61478 bytes	64388 bytes	3805 bytes
[B1.1] Append N characters (time)	325 ms			27 ms
[B1.1] Append N characters (avgUpdateSize)	27 bytes			11 bytes
[B1.1] Append N characters (docSize)	6031 bytes			6004 bytes
[B1.1] Append N characters (memUsed)	1.6 MB			10.3 MB
[B1.1] Append N characters (parseTime)	1 ms			0 ms
[B1.1] Append N characters		skipping	skipping
[B1.2] Insert string of length N (time)	2 ms			0 ms
[B1.2] Insert string of length N (avgUpdateSize)	6031 bytes			6006 bytes
[B1.2] Insert string of length N (docSize)	6031 bytes			6004 bytes
[B1.2] Insert string of length N (memUsed)	271.8 kB			110 kB
[B1.2] Insert string of length N (parseTime)	0 ms			0 ms
[B1.2] Insert string of length N		skipping	skipping
[B1.3] Prepend N characters (time)	264 ms			48 ms
[B1.3] Prepend N characters (avgUpdateSize)	27 bytes			6 bytes
[B1.3] Prepend N characters (docSize)	6041 bytes			6004 bytes
[B1.3] Prepend N characters (memUsed)	2.5 MB			1.3 MB
[B1.3] Prepend N characters (parseTime)	27 ms			0 ms
[B1.3] Prepend N characters		skipping	skipping
[B1.4] Insert N characters at random positions (time)	257 ms			28 ms
[B1.4] Insert N characters at random positions (avgUpdateSize)	29 bytes			10 bytes
[B1.4] Insert N characters at random positions (docSize)	29614 bytes			6004 bytes
[B1.4] Insert N characters at random positions (memUsed)	0 B			60.3 kB
[B1.4] Insert N characters at random positions (parseTime)	2 ms			0 ms
[B1.4] Insert N characters at random positions		skipping	skipping
[B1.5] Insert N words at random positions (time)	234 ms			22 ms
[B1.5] Insert N words at random positions (avgUpdateSize)	36 bytes			16 bytes
[B1.5] Insert N words at random positions (docSize)	87826 bytes			36198 bytes
[B1.5] Insert N words at random positions (memUsed)	1.4 MB			1.1 MB
[B1.5] Insert N words at random positions (parseTime)	7 ms			0 ms
[B1.5] Insert N words at random positions		skipping	skipping
[B1.6] Insert string, then delete it (time)	1 ms			0 ms
[B1.6] Insert string, then delete it (avgUpdateSize)	6053 bytes			6019 bytes
[B1.6] Insert string, then delete it (docSize)	38 bytes			2 bytes
[B1.6] Insert string, then delete it (memUsed)	204.4 kB			60.4 kB
[B1.6] Insert string, then delete it (parseTime)	0 ms			0 ms
[B1.6] Insert string, then delete it		skipping	skipping
[B1.7] Insert/Delete strings at random positions (time)	272 ms			24 ms
[B1.7] Insert/Delete strings at random positions (avgUpdateSize)	31 bytes			14 bytes
[B1.7] Insert/Delete strings at random positions (docSize)	28691 bytes			2512 bytes
[B1.7] Insert/Delete strings at random positions (memUsed)	15.4 MB			0 B
[B1.7] Insert/Delete strings at random positions (parseTime)	6 ms			0 ms
[B1.7] Insert/Delete strings at random positions		skipping	skipping
[B1.8] Append N numbers (time)	268 ms
[B1.8] Append N numbers (avgUpdateSize)	32 bytes
[B1.8] Append N numbers (docSize)	35634 bytes
[B1.8] Append N numbers (memUsed)	0 B
[B1.8] Append N numbers (parseTime)	0 ms
[B1.8] Append N numbers		skipping	skipping
[B1.9] Insert Array of N numbers (time)	2 ms
[B1.9] Insert Array of N numbers (avgUpdateSize)	35661 bytes
[B1.9] Insert Array of N numbers (docSize)	35661 bytes
[B1.9] Insert Array of N numbers (memUsed)	3 MB
[B1.9] Insert Array of N numbers (parseTime)	0 ms
[B1.9] Insert Array of N numbers		skipping	skipping
[B1.10] Prepend N numbers (time)	159 ms
[B1.10] Prepend N numbers (avgUpdateSize)	32 bytes
[B1.10] Prepend N numbers (docSize)	35669 bytes
[B1.10] Prepend N numbers (memUsed)	5.1 MB
[B1.10] Prepend N numbers (parseTime)	2 ms
[B1.10] Prepend N numbers		skipping	skipping
[B1.11] Insert N numbers at random positions (time)	172 ms
[B1.11] Insert N numbers at random positions (avgUpdateSize)	34 bytes
[B1.11] Insert N numbers at random positions (docSize)	59161 bytes
[B1.11] Insert N numbers at random positions (memUsed)	6.1 MB
[B1.11] Insert N numbers at random positions (parseTime)	2 ms
[B1.11] Insert N numbers at random positions		skipping	skipping
[B2.1] Concurrently insert string of length N at index 0 (time)	1 ms			1 ms
[B2.1] Concurrently insert string of length N at index 0 (updateSize)	12058 bytes			12012 bytes
[B2.1] Concurrently insert string of length N at index 0 (docSize)	12149 bytes			12104 bytes
[B2.1] Concurrently insert string of length N at index 0 (memUsed)	523.6 kB			171.5 kB
[B2.1] Concurrently insert string of length N at index 0 (parseTime)	0 ms			0 ms
[B2.1] Concurrently insert string of length N at index 0		skipping	skipping
[B2.2] Concurrently insert N characters at random positions (time)	76 ms			14190 ms
[B2.2] Concurrently insert N characters at random positions (updateSize)	66360 bytes			125734 bytes
[B2.2] Concurrently insert N characters at random positions (docSize)	66454 bytes			12104 bytes
[B2.2] Concurrently insert N characters at random positions (memUsed)	10 MB			13.7 MB
[B2.2] Concurrently insert N characters at random positions (parseTime)	6 ms			0 ms
[B2.2] Concurrently insert N characters at random positions		skipping	skipping
[B2.3] Concurrently insert N words at random positions (time)	80 ms			16041 ms
[B2.3] Concurrently insert N words at random positions (updateSize)	177753 bytes			194342 bytes
[B2.3] Concurrently insert N words at random positions (docSize)	177918 bytes			71752 bytes
[B2.3] Concurrently insert N words at random positions (memUsed)	7.7 MB			10.7 MB
[B2.3] Concurrently insert N words at random positions (parseTime)	30 ms			0 ms
[B2.3] Concurrently insert N words at random positions		skipping	skipping
[B2.4] Concurrently insert & delete (time)	156 ms			68234 ms
[B2.4] Concurrently insert & delete (updateSize)	278025 bytes			383898 bytes
[B2.4] Concurrently insert & delete (docSize)	278153 bytes			77765 bytes
[B2.4] Concurrently insert & delete (memUsed)	16.5 MB			14.4 MB
[B2.4] Concurrently insert & delete (parseTime)	33 ms			0 ms
[B2.4] Concurrently insert & delete		skipping	skipping
[B3.1] 20√N clients concurrently set number in Map (time)	490 ms
[B3.1] 20√N clients concurrently set number in Map (updateSize)	49174 bytes
[B3.1] 20√N clients concurrently set number in Map (docSize)	32232 bytes
[B3.1] 20√N clients concurrently set number in Map (memUsed)	17.1 MB
[B3.1] 20√N clients concurrently set number in Map (parseTime)	25 ms
[B3.1] 20√N clients concurrently set number in Map		skipping
[B3.2] 20√N clients concurrently set Object in Map (time)	526 ms
[B3.2] 20√N clients concurrently set Object in Map (updateSize)	95862 bytes
[B3.2] 20√N clients concurrently set Object in Map (docSize)	41484 bytes
[B3.2] 20√N clients concurrently set Object in Map (memUsed)	6.7 MB
[B3.2] 20√N clients concurrently set Object in Map (parseTime)	21 ms
[B3.2] 20√N clients concurrently set Object in Map		skipping
[B3.3] 20√N clients concurrently set String in Map (time)	618 ms
[B3.3] 20√N clients concurrently set String in Map (updateSize)	7826229 bytes
[B3.3] 20√N clients concurrently set String in Map (docSize)	36824 bytes
[B3.3] 20√N clients concurrently set String in Map (memUsed)	0 B
[B3.3] 20√N clients concurrently set String in Map (parseTime)	14 ms
[B3.3] 20√N clients concurrently set String in Map		skipping
[B3.4] 20√N clients concurrently insert text in Array (time)	534 ms
[B3.4] 20√N clients concurrently insert text in Array (updateSize)	52741 bytes
[B3.4] 20√N clients concurrently insert text in Array (docSize)	26586 bytes
[B3.4] 20√N clients concurrently insert text in Array (memUsed)	14.4 MB
[B3.4] 20√N clients concurrently insert text in Array (parseTime)	4 ms
[B3.4] 20√N clients concurrently insert text in Array		skipping	skipping
[B4] Apply real-world editing dataset (time)	6006 ms			129 ms
[B4] Apply real-world editing dataset (avgUpdateSize)	29 bytes			13 bytes
[B4] Apply real-world editing dataset (encodeTime)	6 ms			1 ms
[B4] Apply real-world editing dataset (docSize)	159929 bytes			108923 bytes
[B4] Apply real-world editing dataset (memUsed)	7 MB			262.8 kB
[B4] Apply real-world editing dataset (parseTime)	9 ms			0 ms
[B4] Apply real-world editing dataset		skipping	skipping
[B4 x 100] Apply real-world editing dataset 100 times (time)	139701 ms			31756 ms
[B4 x 100] Apply real-world editing dataset 100 times (encodeTime)	616 ms			1092 ms
[B4 x 100] Apply real-world editing dataset 100 times (docSize)	15989245 bytes			10891904 bytes
[B4 x 100] Apply real-world editing dataset 100 times (parseTime)	1825 ms			1071 ms
[B4 x 100] Apply real-world editing dataset 100 times (memUsed)	466.1 MB			0 B

[josephg]

Oooh fascinating! <3