As you may know maps are not shrinking in go This library gives you easy-to-use implementation of the map that is shrinking automatically once number of deleted elements reach the limit
package main
import (
"fmt"
"github.com/go-auxiliaries/shrinking-map/pkg/safe-map"
)
func main() {
testMap := safe_map.New[string, string](10000000)
testMap.Set("someKey1", "someVal1")
testMap.Set("someKey2", "someVal2")
// map[someKey1:someVal1 someKey2:someVal2]
fmt.Printf("%v\n", testMap.Values())
testMap.Delete("someKey1")
// map[someKey2:someVal2]
fmt.Printf("%v\n", testMap.Values())
// someVal3
fmt.Printf("%v\n", testMap.GetOrSet("someKey3", "someVal3"))
// someVal3
fmt.Printf("%v\n", testMap.GetOrSet("someKey3", "someVal4"))
}These are the benchmarks against sync.Map
goos: linux
goarch: amd64
pkg: github.com/go-auxiliaries/shrinking-map/pkg/safe-map
cpu: 12th Gen Intel(R) Core(TM) i9-12900HK
Benchmark_TestSuite/Sync_Get_Existing_Parallel_100-20 574680510 2.040 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Parallel_100-20 16876723 64.82 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Parallel_100-20 4579580 543.0 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Parallel_100-20 3505146 410.9 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Parallel_100-20 507411679 2.002 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Parallel_100-20 3937110 361.9 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Parallel_100-20 598342317 2.109 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Parallel_100-20 5360181 352.7 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Parallel_100-20 76702706 18.15 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Parallel_100-20 6074865 323.1 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Parallel_100-20 152064001 6.982 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Parallel_100-20 12711880 157.9 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Parallel_10000-20 359368326 3.193 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Parallel_10000-20 19517655 60.87 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Parallel_10000-20 2357757 513.7 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Parallel_10000-20 2529451 518.3 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Parallel_10000-20 346038777 3.271 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Parallel_10000-20 3070018 445.2 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Parallel_10000-20 344920372 3.223 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Parallel_10000-20 4241340 365.9 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Parallel_10000-20 51026160 22.38 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Parallel_10000-20 3777860 402.1 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Parallel_10000-20 82055820 12.32 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Parallel_10000-20 6319804 231.1 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Parallel_1000000-20 100291227 10.17 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Parallel_1000000-20 18184263 62.27 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Parallel_1000000-20 2596406 477.8 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Parallel_1000000-20 3475326 379.1 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Parallel_1000000-20 84168696 12.50 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Parallel_1000000-20 3314630 455.7 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Parallel_1000000-20 95083435 11.22 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Parallel_1000000-20 3912381 372.5 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Parallel_1000000-20 30091417 34.01 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Parallel_1000000-20 3856132 365.6 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Parallel_1000000-20 18821798 53.71 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Parallel_1000000-20 6336772 224.2 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Parallel_10000000-20 2987179 423.0 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Parallel_10000000-20 17702481 64.85 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Parallel_10000000-20 2595688 565.7 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Parallel_10000000-20 3251793 397.6 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Parallel_10000000-20 2948784 516.5 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Parallel_10000000-20 3789914 418.0 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Parallel_10000000-20 2654278 539.9 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Parallel_10000000-20 3575700 396.3 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Parallel_10000000-20 4139848 545.3 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Parallel_10000000-20 4274433 331.1 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Parallel_10000000-20 1876588 631.8 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Parallel_10000000-20 8878618 206.9 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Parallel_100-20 1000000000 0.9913 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Parallel_100-20 19557538 54.61 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Parallel_100-20 2437075 493.9 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Parallel_100-20 4256010 343.3 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Parallel_100-20 1000000000 1.025 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Parallel_100-20 9591711 179.6 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Parallel_100-20 1000000000 1.088 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Parallel_100-20 8058096 243.4 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Parallel_100-20 100000000 14.24 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Parallel_100-20 4491636 308.9 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Parallel_100-20 191599881 6.353 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Parallel_100-20 11156361 143.5 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Parallel_10000-20 1000000000 1.004 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Parallel_10000-20 18986616 54.76 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Parallel_10000-20 2453768 489.2 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Parallel_10000-20 2988786 463.1 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Parallel_10000-20 1000000000 1.002 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Parallel_10000-20 4908854 272.5 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Parallel_10000-20 1000000000 1.115 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Parallel_10000-20 4882572 282.3 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Parallel_10000-20 49729287 21.69 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Parallel_10000-20 4430449 346.5 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Parallel_10000-20 86142045 13.39 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Parallel_10000-20 10921442 201.8 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Parallel_1000000-20 1000000000 1.125 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Parallel_1000000-20 19023562 54.74 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Parallel_1000000-20 1939941 643.5 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Parallel_1000000-20 3007370 451.5 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Parallel_1000000-20 1000000000 1.057 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Parallel_1000000-20 4815855 292.3 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Parallel_1000000-20 1000000000 1.015 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Parallel_1000000-20 5013561 269.8 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Parallel_1000000-20 2955369 443.8 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Parallel_1000000-20 3351228 404.3 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Parallel_1000000-20 4925106 542.0 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Parallel_1000000-20 7892790 229.5 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Parallel_10000000-20 1000000000 1.013 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Parallel_10000000-20 19985877 54.51 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Parallel_10000000-20 2355073 535.4 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Parallel_10000000-20 3000261 433.3 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Parallel_10000000-20 1000000000 1.005 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Parallel_10000000-20 6978391 284.4 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Parallel_10000000-20 1000000000 1.035 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Parallel_10000000-20 5544055 246.2 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Parallel_10000000-20 2765965 418.7 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Parallel_10000000-20 3392496 458.0 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Parallel_10000000-20 3135346 613.0 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Parallel_10000000-20 6366879 233.6 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Linear_100-20 63669410 18.51 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Linear_100-20 64913563 18.40 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Linear_100-20 10951699 105.7 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Linear_100-20 38890647 30.86 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Linear_100-20 70088430 17.93 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Linear_100-20 36791875 33.38 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Linear_100-20 66952568 17.64 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Linear_100-20 36971284 32.07 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Linear_100-20 16298546 71.37 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Linear_100-20 39489004 30.43 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Linear_100-20 25721468 44.84 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Linear_100-20 41185646 29.27 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Linear_10000-20 31513636 37.38 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Linear_10000-20 32943967 36.55 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Linear_10000-20 10481876 114.0 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Linear_10000-20 29151861 38.63 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Linear_10000-20 31749602 36.20 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Linear_10000-20 21368912 47.43 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Linear_10000-20 32354337 36.58 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Linear_10000-20 26819620 44.48 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Linear_10000-20 16062680 76.43 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Linear_10000-20 28636717 41.72 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Linear_10000-20 17729290 61.54 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Linear_10000-20 22947308 44.87 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Linear_1000000-20 14247619 83.03 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Linear_1000000-20 15688119 77.00 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Linear_1000000-20 5849140 197.3 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Linear_1000000-20 11937541 84.86 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Linear_1000000-20 14981034 77.54 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Linear_1000000-20 10694175 97.42 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Linear_1000000-20 14996866 79.53 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Linear_1000000-20 12510092 95.59 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Linear_1000000-20 7006353 154.5 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Linear_1000000-20 13955450 86.87 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Linear_1000000-20 10743942 110.1 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Linear_1000000-20 12147165 91.64 ns/op
Benchmark_TestSuite/Sync_Get_Existing_Linear_10000000-20 9198398 154.3 ns/op
Benchmark_TestSuite/SafeMap_Get_Existing_Linear_10000000-20 14745873 85.11 ns/op
Benchmark_TestSuite/Sync_Set_Existing_Linear_10000000-20 5493913 211.5 ns/op
Benchmark_TestSuite/SafeMap_Set_Existing_Linear_10000000-20 13110157 95.38 ns/op
Benchmark_TestSuite/Sync_Delete_Existing_Linear_10000000-20 6869094 166.6 ns/op
Benchmark_TestSuite/SafeMap_Delete_Existing_Linear_10000000-20 12890013 110.6 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_Existing_Linear_10000000-20 7507372 151.1 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_Existing_Linear_10000000-20 8877446 156.3 ns/op
Benchmark_TestSuite/Sync_GetOrSet_Existing_Linear_10000000-20 6520016 191.4 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_Existing_Linear_10000000-20 14933388 95.09 ns/op
Benchmark_TestSuite/Sync_Mixed_Existing_Linear_10000000-20 6675783 190.3 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Linear_10000000-20 13785230 109.4 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Linear_100-20 100000000 10.07 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Linear_100-20 77151236 15.44 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Linear_100-20 10429992 110.2 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Linear_100-20 38925982 30.80 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Linear_100-20 131633998 9.116 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Linear_100-20 42306814 28.54 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Linear_100-20 129460143 9.652 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Linear_100-20 39100035 28.05 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Linear_100-20 17955370 67.31 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Linear_100-20 39377995 30.51 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Linear_100-20 30521538 40.46 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Linear_100-20 36812632 35.37 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Linear_10000-20 100000000 11.24 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Linear_10000-20 77718800 15.43 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Linear_10000-20 10738016 108.1 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Linear_10000-20 30988747 38.20 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Linear_10000-20 129764692 9.223 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Linear_10000-20 41361781 28.62 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Linear_10000-20 129433466 9.120 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Linear_10000-20 43091794 27.81 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Linear_10000-20 16638021 74.34 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Linear_10000-20 29615571 40.20 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Linear_10000-20 22718679 54.90 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Linear_10000-20 28340762 41.39 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Linear_1000000-20 131575062 9.219 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Linear_1000000-20 77042383 15.46 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Linear_1000000-20 4477153 237.4 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Linear_1000000-20 11701244 95.81 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Linear_1000000-20 137279714 8.774 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Linear_1000000-20 42228463 28.65 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Linear_1000000-20 129309384 9.037 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Linear_1000000-20 42561860 27.90 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Linear_1000000-20 5101731 201.4 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Linear_1000000-20 10424455 104.7 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Linear_1000000-20 10509524 107.5 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Linear_1000000-20 16981828 71.11 ns/op
Benchmark_TestSuite/Sync_Get_NonExisting_Linear_10000000-20 133417846 8.831 ns/op
Benchmark_TestSuite/SafeMap_Get_NonExisting_Linear_10000000-20 76370257 15.51 ns/op
Benchmark_TestSuite/Sync_Set_NonExisting_Linear_10000000-20 3098736 397.0 ns/op
Benchmark_TestSuite/SafeMap_Set_NonExisting_Linear_10000000-20 6665934 199.8 ns/op
Benchmark_TestSuite/Sync_Delete_NonExisting_Linear_10000000-20 138650385 8.696 ns/op
Benchmark_TestSuite/SafeMap_Delete_NonExisting_Linear_10000000-20 40610791 28.82 ns/op
Benchmark_TestSuite/Sync_GetAndDelete_NonExisting_Linear_10000000-20 132316108 9.026 ns/op
Benchmark_TestSuite/SafeMap_GetAndDelete_NonExisting_Linear_10000000-20 41460210 28.15 ns/op
Benchmark_TestSuite/Sync_GetOrSet_NonExisting_Linear_10000000-20 2938242 378.4 ns/op
Benchmark_TestSuite/SafeMap_GetOrSet_NonExisting_Linear_10000000-20 5678400 252.5 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Linear_10000000-20 4031577 370.9 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Linear_10000000-20 12334532 164.2 ns/op
PASS
ok github.com/go-auxiliaries/shrinking-map/pkg/safe-map 950.004sAs you can see it is slower than sync.Map in almost all cases when parallel access takes place.
But on huge dataset it is getting 300% faster:
Benchmark_TestSuite/Sync_Mixed_Existing_Parallel_10000000-20 1876588 631.8 ns/op
Benchmark_TestSuite/SafeMap_Mixed_Existing_Parallel_10000000-20 8878618 206.9 ns/op
Benchmark_TestSuite/Sync_Mixed_NonExisting_Parallel_10000000-20 3135346 613.0 ns/op
Benchmark_TestSuite/SafeMap_Mixed_NonExisting_Parallel_10000000-20 6366879 233.6 ns/opSo, if you are expecting >10000000 unique keys, rwMutex over map is your choice.
Otherwise, stick to sync.Map.