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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

7% duplication:

141,245 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
10,274 duplicated lines

1,767 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
folly/container (3%) --> folly (<1%)	477	2 file pairs	details...
CMake (7%) --> build/fbcode_builder (1%)	270	34 file pairs	details...

Open 3D force graph...

Show more details on duplication between components...

Longest Duplicates

The list of 50 longest duplicates.

See data for all 1,767 duplicates...

Size	#	Folders	Files	Lines	Code
60	x 2	folly folly	sorted_vector_types.h sorted_vector_types.h	425:521 (8%) 906:1002 (8%)	view
53	x 2	folly/hash folly/hash	SpookyHashV1.cpp SpookyHashV2.cpp	100:154 (22%) 101:155 (22%)	view
44	x 2	folly/hash folly/hash	SpookyHashV1.cpp SpookyHashV2.cpp	238:300 (18%) 238:300 (18%)	view
38	x 2	folly/container folly/container	F14Map.h F14Set.h	730:810 (4%) 529:610 (6%)	view
36	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	123:196 (31%) 124:197 (30%)	view
36	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	201:278 (31%) 206:283 (30%)	view
35	x 2	folly/container folly/container/detail	F14Map.h F14MapFallback.h	244:302 (4%) 87:140 (8%)	view
33	x 2	CMake build/fbcode_builder/CMake	cmake FindZstd.cmake FindZstd.cmake	2:41 (97%) 2:41 (97%)	view
32	x 2	folly/container folly/container	F14Map.h F14Set.h	305:354 (3%) 261:310 (5%)	view
29	x 2	folly/experimental/crypto/detail folly/experimental/crypto/detail	MathOperation_Simple.cpp MathOperation_Simple.cpp	39:80 (23%) 104:145 (23%)	view
28	x 2	folly folly	Expected.h Expected.h	324:355 (3%) 586:617 (3%)	view
28	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	57:117 (24%) 58:118 (23%)	view
28	x 2	folly/container folly	heap_vector_types.h sorted_vector_types.h	1173:1221 (3%) 1021:1069 (3%)	view
26	x 2	folly/experimental/crypto/detail folly/experimental/crypto/detail	MathOperation_AVX2.cpp MathOperation_AVX2.cpp	47:78 (15%) 104:135 (15%)	view
26	x 2	folly/experimental/crypto/detail folly/experimental/crypto/detail	MathOperation_SSE2.cpp MathOperation_SSE2.cpp	46:77 (15%) 103:133 (15%)	view
24	x 2	folly/container folly	heap_vector_types.h sorted_vector_types.h	1289:1313 (2%) 1130:1154 (3%)	view
24	x 2	folly/net folly/net	TcpInfoTypes.h TcpInfoTypes.h	63:93 (20%) 149:179 (20%)	view
23	x 2	folly/container folly/container	heap_vector_types.h heap_vector_types.h	459:486 (2%) 469:496 (2%)	view
22	x 2	folly/hash folly/hash	SpookyHashV1.cpp SpookyHashV2.cpp	303:335 (9%) 303:335 (9%)	view
21	x 2	folly/hash folly/hash	SpookyHashV1.cpp SpookyHashV2.cpp	63:94 (9%) 64:95 (9%)	view
21	x 2	folly/hash folly/hash	SpookyHashV1.cpp SpookyHashV2.cpp	162:189 (9%) 163:190 (9%)	view
21	x 2	folly/container folly	heap_vector_types.h sorted_vector_types.h	615:640 (2%) 205:230 (2%)	view
20	x 2	folly/container folly	heap_vector_types.h sorted_vector_types.h	587:611 (2%) 178:202 (2%)	view
19	x 2	folly/concurrency/detail folly/concurrency/detail	ConcurrentHashMap-detail.h ConcurrentHashMap-detail.h	1215:1236 (1%) 1270:1291 (1%)	view
19	x 2	folly/hash folly/hash	SpookyHashV1.cpp SpookyHashV2.cpp	352:378 (8%) 354:380 (8%)	view
19	x 2	folly/container folly/container	F14Map.h F14Set.h	1057:1083 (2%) 823:849 (3%)	view
19	x 2	folly/experimental/coro folly/experimental/coro	Collect-inl.h Collect-inl.h	629:669 (2%) 899:941 (2%)	view
19	x 2	folly/fibers folly/fibers	Semaphore.cpp SemaphoreBase.cpp	146:182 (14%) 135:171 (15%)	view
18	x 2	folly/experimental/coro folly/experimental/coro	Collect-inl.h Collect-inl.h	639:672 (2%) 774:809 (2%)	view
18	x 2	folly/experimental/symbolizer folly/experimental/symbolizer	DwarfImpl.cpp DwarfImpl.cpp	509:528 (4%) 604:623 (4%)	view
18	x 2	folly/io/async folly/io/async	AsyncUDPSocket.cpp AsyncUDPSocket.cpp	493:513 (2%) 592:612 (2%)	view
18	x 2	folly/concurrency/detail folly/concurrency/detail	ConcurrentHashMap-detail.h ConcurrentHashMap-detail.h	284:308 (1%) 1190:1214 (1%)	view
18	x 2	folly/io/async folly/io/async	SSLOptions.h SSLOptions.h	52:81 (15%) 152:177 (15%)	view
17	x 2	folly/io/async folly/io/async	AsyncSocket.cpp AsyncUDPSocket.cpp	2536:2558 (<1%) 1005:1024 (1%)	view
17	x 2	folly/detail folly/detail	StaticSingletonManager.h StaticSingletonManager.h	61:84 (17%) 138:161 (17%)	view
17	x 2	folly/container folly	heap_vector_types.h sorted_vector_types.h	1159:1186 (1%) 510:537 (2%)	view
16	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	210:225 (3%) 273:288 (3%)	view
16	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	243:258 (3%) 273:288 (3%)	view
16	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	210:225 (3%) 243:258 (3%)	view
16	x 2	folly/experimental/coro folly/experimental/coro	Collect-inl.h Collect-inl.h	774:806 (2%) 909:941 (2%)	view
16	x 2	folly/container/detail folly/container/detail	F14MapFallback.h F14SetFallback.h	374:391 (4%) 188:205 (5%)	view
15	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	425:439 (3%) 481:495 (3%)	view
15	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	118:132 (3%) 331:345 (3%)	view
15	x 2	folly/experimental folly/experimental	RelaxedConcurrentPriorityQueue.h RelaxedConcurrentPriorityQueue.h	693:710 (2%) 742:759 (2%)	view
15	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	118:132 (3%) 282:296 (3%)	view
15	x 2	folly/container folly/container	heap_vector_types.h heap_vector_types.h	459:476 (1%) 479:496 (1%)	view
15	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	282:296 (3%) 331:345 (3%)	view
15	x 2	folly/experimental/coro folly/experimental/coro	BlockingWait.h RustAdaptors.h	337:356 (5%) 116:135 (14%)	view
15	x 2	folly/experimental/coro folly/experimental/coro	Task.h Task.h	237:261 (3%) 296:320 (3%)	view
15	x 2	folly folly	AtomicHashMap-inl.h AtomicHashMap-inl.h	323:337 (3%) 363:377 (3%)	view

Duplicated Units

The list of top 23 duplicated units.

See data for all 23 unit duplicates...

Size	#	Folders	Files	Lines	Code
17	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	141:159 142:160	view
16	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	177:194 178:195	view
14	x 2	folly/experimental/coro folly/experimental/coro	RustAdaptors.h BlockingWait.h	119:136 340:357	view
14	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	221:236 226:241	view
13	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	250:264 255:269	view
12	x 2	folly/container folly/container	F14Map.h F14Set.h	307:320 263:276	view
12	x 2	folly/logging folly/logging	CustomLogFormatter.cpp GlogStyleFormatter.cpp	30:43 28:41	view
10	x 2	folly folly/container	sorted_vector_types.h heap_vector_types.h	206:217 616:627	view
9	x 2	folly/experimental/crypto/detail folly/experimental/crypto/detail	MathOperation_SSE2.cpp MathOperation_AVX2.cpp	219:229 220:230	view
7	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	70:78 71:79	view
7	x 2	folly/hash folly/hash	SpookyHashV1.h SpookyHashV2.h	83:91 84:92	view
7	x 2	folly/container folly/container	F14Map.h F14Set.h	323:337 279:293	view
7	x 2	folly/container folly/container	F14Map.h F14Set.h	1072:1080 838:846	view
7	x 2	folly/container/detail folly/container/detail	F14SetFallback.h F14MapFallback.h	141:149 277:285	view
7	x 2	folly/container/detail folly/container/detail	F14SetFallback.h F14MapFallback.h	334:342 482:490	view
7	x 2	folly folly	IPAddressV4.cpp IPAddressV6.cpp	111:119 176:184	view
6	x 2	folly/experimental/crypto/detail folly/experimental/crypto/detail	MathOperation_SSE2.cpp MathOperation_AVX2.cpp	256:263 256:263	view
6	x 2	folly/experimental folly/experimental	StringKeyedSet.h StringKeyedMap.h	160:167 178:185	view
6	x 2	folly folly/container	sorted_vector_types.h heap_vector_types.h	792:799 894:901	view
6	x 2	folly/container folly/container	F14Map.h F14Set.h	341:351 297:307	view
6	x 4	folly/container folly/container/detail folly/container/detail folly/container	F14Map.h F14SetFallback.h F14MapFallback.h F14Set.h	855:862 267:274 421:428 645:652	view
6	x 2	folly/executors folly/executors	TimedDrivableExecutor.cpp ManualExecutor.cpp	67:74 80:87	view
6	x 3	folly/executors folly/executors folly/executors	ExecutorWithPriority-inl.h TimekeeperScheduledExecutor.cpp SerialExecutor.cpp	47:54 69:76 50:57	view