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Intro

For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.

Learn more...

Duplication Overall

8% duplication:

44,947 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
3,911 duplicated lines

316 duplicates

Duplication per Extension

Duplication per Component (primary)

Duplication Between Components (50+ lines)

Download: SVG DOT (open online Graphviz editor)

From Component --> To Component	Duplicated Lines	File Pairs	Details
build/fbcode_builder (3%) --> cmake (49%)	570	3 file pairs	details...
quic/client (8%) --> quic/server (3%)	392	8 file pairs	details...
quic/fizz (2%) --> quic/server (<1%)	50	1 file pair	details...

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Show more details on duplication between components...

Longest Duplicates

The list of 50 longest duplicates.

See data for all 316 duplicates...

Size	#	Folders	Files	Lines	Code
227	x 2	build/fbcode_builder/CMake cmake	cmake FindSodium.cmake FindSodium.cmake	1:256 (85%) 1:256 (86%)	view
35	x 2	build/fbcode_builder/CMake cmake	cmake FindSodium.cmake FindSodium.cmake	262:297 (13%) 259:294 (13%)	view
26	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	2087:2114 (1%) 2163:2190 (1%)	view
23	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	2091:2114 (<1%) 3521:3544 (<1%)	view
23	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	2167:2190 (<1%) 3521:3544 (<1%)	view
22	x 2	quic/client/state quic/server/state	ClientStateMachine.cpp ServerStateMachine.cpp	155:178 (10%) 207:230 (2%)	view
19	x 2	quic/client quic/server	QuicClientTransport.cpp QuicServerTransport.cpp	863:886 (1%) 230:252 (2%)	view
18	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	3548:3565 (<1%) 3602:3619 (<1%)	view
17	x 2	quic/codec quic/codec	QuicReadCodec.cpp QuicReadCodec.cpp	554:571 (4%) 576:593 (4%)	view
16	x 2	quic/server/state quic/server/state	ServerStateMachine.cpp ServerStateMachine.cpp	786:806 (1%) 1321:1341 (1%)	view
15	x 2	build/fbcode_builder/CMake build/fbcode_builder/CMake	cmake FBThriftCppLibrary.cmake FBThriftPyLibrary.cmake	171:185 (8%) 40:54 (15%)	view
15	x 2	quic/congestion_control quic/congestion_control	CongestionControllerFactory.cpp ServerCongestionControllerFactory.cpp	55:72 (30%) 64:81 (28%)	view
14	x 2	build/fbcode_builder/getdeps build/fbcode_builder/getdeps	builder.py builder.py	722:735 (1%) 1208:1221 (1%)	view
14	x 2	quic/api quic/api	QuicTransportFunctions.cpp QuicTransportFunctions.h	1319:1332 (1%) 273:286 (6%)	view
14	x 2	quic/congestion_control quic/congestion_control	Copa.cpp Copa2.cpp	290:305 (5%) 110:124 (8%)	view
14	x 2	quic/client quic/server	QuicClientTransport.cpp QuicServerTransport.cpp	907:922 (1%) 275:290 (2%)	view
13	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	2051:2068 (<1%) 2120:2137 (<1%)	view
13	x 2	build/fbcode_builder/getdeps build/fbcode_builder/getdeps	platform.py platform.py	78:92 (7%) 136:149 (7%)	view
13	x 2	build/fbcode_builder/CMake build/fbcode_builder/CMake	cmake FindLibUnwind.cmake FindZstd.cmake	1:13 (52%) 1:13 (38%)	view
13	x 2	quic/client/handshake quic/server/handshake	ClientHandshake.cpp ServerHandshake.cpp	68:80 (9%) 44:56 (4%)	view
13	x 2	quic/congestion_control quic/congestion_control	Copa.cpp Copa2.cpp	48:61 (5%) 38:51 (8%)	view
13	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	3577:3589 (<1%) 3604:3616 (<1%)	view
13	x 2	quic/client/handshake quic/server/handshake	ClientHandshake.cpp ServerHandshake.cpp	85:97 (9%) 233:247 (4%)	view
13	x 2	quic/api quic/api	QuicTransportFunctions.cpp QuicTransportFunctions.h	1444:1456 (<1%) 289:301 (6%)	view
13	x 2	quic/state quic/state	OutstandingPacket.h OutstandingPacket.h	209:221 (7%) 238:250 (7%)	view
13	x 2	build/fbcode_builder/CMake cmake	cmake FindGlog.cmake FindGlog.cmake	22:37 (44%) 14:29 (59%)	view
13	x 2	quic/api quic/api	QuicTransportBase.cpp QuicTransportBase.cpp	3550:3562 (<1%) 3577:3589 (<1%)	view
12	x 2	quic/client/handshake quic/server/handshake	ClientTransportParametersExtension.h ServerTransportParametersExtension.h	28:39 (25%) 32:43 (11%)	view
12	x 2	quic/server/state quic/server/state	ServerStateMachine.cpp ServerStateMachine.cpp	829:845 (1%) 1361:1377 (1%)	view
11	x 2	quic/server quic/server	QuicServer.cpp QuicServer.cpp	774:785 (1%) 798:809 (1%)	view
11	x 2	quic/dsr/backend quic/dsr/backend	DSRPacketizer.cpp DSRPacketizer.h	13:23 (10%) 136:146 (10%)	view
11	x 2	quic/congestion_control quic/congestion_control	Copa2.h QuicCCP.h	24:36 (20%) 60:72 (27%)	view
11	x 2	build/fbcode_builder/CMake build/fbcode_builder/CMake	cmake FBThriftCppLibrary.cmake FBThriftPyLibrary.cmake	86:97 (6%) 53:64 (11%)	view
11	x 2	quic/congestion_control quic/congestion_control	Copa.h NewReno.h	33:45 (16%) 22:34 (30%)	view
11	x 2	build/fbcode_builder/CMake build/fbcode_builder/CMake	cmake RustStaticLibrary.cmake RustStaticLibrary.cmake	115:127 (4%) 180:192 (4%)	view
11	x 2	quic/client quic/server	QuicClientTransport.cpp QuicServerTransport.cpp	850:861 (<1%) 217:228 (1%)	view
11	x 2	quic/state quic/state	OutstandingPacket.h OutstandingPacket.h	114:124 (6%) 233:243 (6%)	view
11	x 2	quic/fizz/client/handshake quic/server/handshake	FizzClientHandshake.cpp ServerHandshake.cpp	223:236 (4%) 288:301 (3%)	view
10	x 2	quic/api quic/api	QuicBatchWriter.h QuicBatchWriter.h	113:124 (5%) 178:189 (5%)	view
10	x 2	quic/fizz/handshake quic/fizz/handshake	QuicFizzFactory.cpp QuicFizzFactory.cpp	16:27 (13%) 36:47 (13%)	view
10	x 2	quic/client quic/server	QuicClientTransport.cpp QuicServerWorker.cpp	1163:1176 (<1%) 303:316 (1%)	view
10	x 2	quic/api quic/api	QuicTransportFunctions.cpp QuicTransportFunctions.cpp	189:198 (<1%) 292:301 (<1%)	view
10	x 2	quic/api quic/api	Observer.h Observer.h	136:145 (3%) 162:171 (3%)	view
10	x 2	build/fbcode_builder/getdeps build/fbcode_builder/getdeps	manifest.py manifest.py	489:498 (1%) 501:510 (1%)	view
10	x 2	quic/congestion_control quic/congestion_control	Bbr.h Copa.h	128:139 (6%) 35:46 (15%)	view
10	x 2	quic/congestion_control quic/congestion_control	Copa.cpp NewReno.cpp	301:312 (4%) 142:152 (8%)	view
10	x 2	quic/congestion_control quic/congestion_control	CongestionControllerFactory.cpp ServerCongestionControllerFactory.cpp	39:48 (20%) 45:55 (19%)	view
10	x 2	quic/server/state quic/server/state	ServerStateMachine.cpp ServerStateMachine.cpp	1287:1297 (<1%) 1302:1312 (<1%)	view
10	x 2	build/fbcode_builder/CMake cmake	cmake FindGMock.cmake FindGMock.cmake	2:12 (14%) 7:17 (18%)	view
10	x 2	quic/api quic/api	QuicTransportFunctions.cpp QuicTransportFunctions.h	964:973 (<1%) 108:117 (4%)	view

Duplicated Units

The list of top 2 duplicated units.

See data for all 2 unit duplicates...

Size	#	Folders	Files	Lines	Code
14	x 2	quic/congestion_control quic/congestion_control	Copa.cpp Copa2.cpp	47:63 37:53	view
8	x 3	quic/congestion_control quic/congestion_control quic/congestion_control	Copa.cpp Copa2.cpp NewReno.cpp	36:45 26:35 28:37	view