{"id":44301,"date":"2023-03-15T06:58:28","date_gmt":"2023-05-22T20:00:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/golang-%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98\/"},"modified":"2024-04-29T18:58:46","modified_gmt":"2024-04-29T10:58:46","slug":"golang-%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/golang-%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98\/","title":{"rendered":"Golang \u6027\u80fd\u8c03\u4f18"},"content":{"rendered":"

\u8fd9\u7bc7\u6587\u7ae0\u662f2014\u5e7412\u670817\u65e5\u7684Go\u5723\u8bde\u65e5\u5386\u7684\u6587\u7ae0\u3002<\/p>\n

\u6211\u4f1a\u8c08\u8bba\u5728Go\u4e2d\u8fdb\u884c\u6027\u80fd\u8c03\u4f18\u7684\u8bdd\u9898\u3002\u8fd9\u4e9b\u90fd\u662f\u4eceDenco\u548cKocha\u7b49\u6027\u80fd\u8c03\u4f18\u7ecf\u9a8c\u4e2d\u5f97\u6765\u7684\u89c1\u89e3\u3002\u8bf7\u6ce8\u610f\uff0c\u8fd9\u5e76\u4e0d\u6d89\u53ca\u5904\u7406\u7cfb\u7edf\u7684\u8ba8\u8bba\u3002<\/p>\n

\u524d\u63d0 (Qian ti)<\/h2>\n

\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u3092\u53d6\u3063\u305f\u5f8c\u3001\u3058\u3083\u3042\u3069\u3046\u3084\u3063\u3066\u6700\u9069\u5316\u3059\u308b\u304b\u3068\u3044\u3046\u3068\u3053\u308d\u306e\u8a71\u3067\u3059<\/p>\n

\u300c\u63a8\u6e2c\u3059\u308b\u306a\u3001\u8a08\u6e2c\u305b\u3088\u300d<\/p>\n

\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3084\u30c7\u30fc\u30bf\u69cb\u9020\u306f\u6700\u9069\u306a\u3082\u306e\u304c\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3059<\/p>\n

\u5c0f\u624b\u5148\u306e\u6700\u9069\u5316\u3092\u884c\u3046\u3088\u308a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u81ea\u4f53\u3092\u5909\u3048\u305f\u307b\u3046\u304c\u5727\u5012\u7684\u306b\u826f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u306e\u5404\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306f Go 1.4 \uff08go version go1.4 linux\/amd64\uff09\u3067\u4e0b\u8a18\u306e\u30b3\u30de\u30f3\u30c9\u306b\u3066\u53d6\u3063\u3066\u3044\u307e\u3059<\/p>\n

go test -run NONE -bench . -benchmem<\/p>\n

\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306e\u7d50\u679c\u306f\u74b0\u5883\u306b\u5de6\u53f3\u3055\u308c\u308b\u306e\u3067\u3001\u3042\u304f\u307e\u3067\u7b46\u8005\u306e\u74b0\u5883\u3067\u306e\u7d50\u679c\u3067\u3059<\/p>\n

\u51cf\u5c11\u5185\u5b58\u5206\u914d\u7684\u6b21\u6570<\/h2>\n

\u5728Go\u7684\u4ee3\u7801\u4e2d\uff0c\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u6700\u5927\u7684\u662f\u5185\u5b58\u5206\u914d\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u51cf\u5c11\u5185\u5b58\u5206\u914d\u6b21\u6570\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u6027\u80fd\u3002<\/p>\n

package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> \"testing\"<\/span>\r\n\r\nfunc<\/span> BenchmarkMemAllocOndemand<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 10<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        s<\/span> :=<\/span> make<\/span>([]<\/span>string<\/span>,<\/span> 0<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            s<\/span> =<\/span> append<\/span>(<\/span>s<\/span>,<\/span> \"alice\"<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkMemAllocAllBeforeUsing<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 10<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        s<\/span> :=<\/span> make<\/span>([]<\/span>string<\/span>,<\/span> 0<\/span>,<\/span> n<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            s<\/span> =<\/span> append<\/span>(<\/span>s<\/span>,<\/span> \"alice\"<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkMemAllocOndemand        1000000              1953 ns\/op             496 B\/op         5 allocs\/op\r\nBenchmarkMemAllocAllBeforeUsing  3000000               571 ns\/op             160 B\/op         1 allocs\/op\r\n<\/code><\/pre>\n
\u5982\u679c\u5df2\u7ecf\u4e8b\u5148\u77e5\u9053\u8981\u7d20\u6570\uff0c\u5c31\u4e0d\u8981\u4f7f\u7528 append\u3002<\/h2>\n
\u5728\u586b\u5145\u5207\u7247\u5143\u7d20\u65f6\uff0c\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u8d4b\u503c\u6bd4\u4f7f\u7528append\u65b9\u6cd5\u8ffd\u52a0\u5143\u7d20\u66f4\u5feb\u3002<\/p>\n
package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> \"testing\"<\/span>\r\n\r\nfunc<\/span> BenchmarkFillSliceByAppend<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 100<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        s<\/span> :=<\/span> make<\/span>([]<\/span>int<\/span>,<\/span> 0<\/span>,<\/span> n<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            s<\/span> =<\/span> append<\/span>(<\/span>s<\/span>,<\/span> j<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkFillSliceByIndex<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 100<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        s<\/span> :=<\/span> make<\/span>([]<\/span>int<\/span>,<\/span> n<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            s<\/span>[<\/span>j<\/span>]<\/span> =<\/span> j<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkFillSliceByAppend        500000              2694 ns\/op             896 B\/op         1 allocs\/op\r\nBenchmarkFillSliceByIndex         500000              2487 ns\/op             896 B\/op         1 allocs\/op\r\n<\/code><\/pre>\n
\u5047\u8bbe\u4e0d\u4f7f\u7528\u9891\u9053<\/h2>\n
\u4f7f\u7528sync.Mutex\u6216sync.RWMutex\u6bd4\u4f7f\u7528channel\u8fdb\u884c\u4e92\u65a5\u63a7\u5236\u66f4\u5feb\u3002<\/p>\n
package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"sync\"<\/span>\r\n    \"testing\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> BenchmarkExclusiveWithChannel<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    c<\/span> :=<\/span> make<\/span>(<\/span>chan<\/span> struct<\/span>{},<\/span> 1<\/span>)<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        c<\/span> <-<\/span> struct<\/span>{}{}<\/span>\r\n        \/\/ do something.<\/span>\r\n        <-<\/span>c<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkExclusiveWithMutex<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    mu<\/span> :=<\/span> new<\/span>(<\/span>sync<\/span>.<\/span>Mutex<\/span>)<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        mu<\/span>.<\/span>Lock<\/span>()<\/span>\r\n        \/\/ do something.<\/span>\r\n        mu<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkExclusiveWithChannel   20000000                70.2 ns\/op             0 B\/op         0 allocs\/op\r\nBenchmarkExclusiveWithMutex     100000000               21.1 ns\/op             0 B\/op         0 allocs\/op\r\n<\/code><\/pre>\n
\u540c\u6837\uff0c\u5bf9\u4e8e\u540c\u6b65\u5904\u7406\uff0c\u4f7f\u7528sync.WaitGroup\u4f1a\u66f4\u5feb\u901f\u3002<\/p>\n
package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"sync\"<\/span>\r\n    \"testing\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> BenchmarkSyncWithChannel<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 10<\/span>\r\n    c<\/span> :=<\/span> make<\/span>(<\/span>chan<\/span> struct<\/span>{},<\/span> n<\/span>)<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            go<\/span> func<\/span>()<\/span> {<\/span>\r\n                \/\/ do something.<\/span>\r\n                c<\/span> <-<\/span> struct<\/span>{}{}<\/span>\r\n            }()<\/span>\r\n        }<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            <-<\/span>c<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkSyncWithWaitGroup<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 10<\/span>\r\n    var<\/span> wg<\/span> sync<\/span>.<\/span>WaitGroup<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        wg<\/span>.<\/span>Add<\/span>(<\/span>n<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            go<\/span> func<\/span>()<\/span> {<\/span>\r\n                \/\/ do something.<\/span>\r\n                wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n            }()<\/span>\r\n        }<\/span>\r\n        wg<\/span>.<\/span>Wait<\/span>()<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkSyncWithChannel          500000              3511 ns\/op             160 B\/op        10 allocs\/op\r\nBenchmarkSyncWithWaitGroup        500000              3086 ns\/op             164 B\/op        11 allocs\/op\r\n<\/code><\/pre>\n
\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4e0d\u8c03\u7528\u51fd\u6570\uff08\u65b9\u6cd5\uff09<\/h2>\n
Go\u8bed\u8a00\u4e2d\u7684\u51fd\u6570\u548c\u65b9\u6cd5\u8c03\u7528\u901f\u5ea6\u8f83\u6162\u3002\u5982\u679c\u53ea\u6d89\u53ca\u6570\u884c\u4ee3\u7801\uff0c\u7f16\u8bd1\u5668\u4f1a\u8fdb\u884c\u5185\u8054\u5c55\u5f00\uff0c\u4f46\u4e0d\u6d89\u53ca\u5185\u8054\u5c55\u5f00\u7684\u4ee3\u7801\u4f1a\u6bd4\u8f83\u6162\u3002
\n\u4ee5Denco\u7684\u4ee3\u7801\u4e3a\u4f8b\uff0c\u6545\u610f\u4f7f\u7528GOTO\u8bed\u53e5\u6765\u63d0\u9ad8\u6027\u80fd\uff0c\u5728\u80fd\u5b9e\u73b0\u9012\u5f52\u8c03\u7528\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u7f16\u5199\u51fa\u66f4\u7b80\u6d01\u7684\u4ee3\u7801\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u4e0d\u662f\u745e\u58eb\u519b\u5200\u3002<\/h2>\n
Go\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u5305\u4e0eRuby\u548cPython\u7b49\u8bed\u8a00\u4e0d\u540c\uff0c\u5b83\u91c7\u7528\u4e86\u4e00\u79cd\u4fdd\u8bc1\u7ebf\u6027\u65f6\u95f4\u5b8c\u6210\u5904\u7406\u7684\u7b97\u6cd5\u3002<\/p>\n
\u7136\u800c\uff0c\u4ee3\u4ef7\u662f\u5b83\u975e\u5e38\u6162\uff0c\u6240\u4ee5\u5982\u679c\u50cf\u5176\u4ed6\u8bed\u8a00\u90a3\u6837\u968f\u610f\u4f7f\u7528\u5b83\uff0c\u6027\u80fd\u4f1a\u4e25\u91cd\u4e0b\u964d\u3002
\n\u56e0\u6b64\uff0c\u5728\u53ef\u8bfb\u6027\u7b49\u65b9\u9762\u5b58\u5728\u6743\u8861\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53\u771f\u6b63\u9700\u8981\u901f\u5ea6\u65f6\uff0c\u6700\u597d\u81ea\u5df1\u7f16\u5199\u5b57\u7b26\u4e32\u5339\u914d\u548c\u66ff\u6362\u7b49\u529f\u80fd\u3002<\/p>\n
package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"regexp\"<\/span>\r\n    \"testing\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> BenchmarkStringMatchWithRegexp<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    s<\/span> :=<\/span> \"0xDeadBeef\"<\/span>\r\n    re<\/span> :=<\/span> regexp<\/span>.<\/span>MustCompile<\/span>(<\/span>`^0[xX][0-9A-Fa-f]+$`<\/span>)<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        re<\/span>.<\/span>MatchString<\/span>(<\/span>s<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkStringMatchWithoutRegexp<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    s<\/span> :=<\/span> \"0xDeadBeef\"<\/span>\r\n    isHexString<\/span> :=<\/span> func<\/span>(<\/span>s<\/span> string<\/span>)<\/span> bool<\/span> {<\/span>\r\n        if<\/span> len<\/span>(<\/span>s<\/span>)<\/span> <<\/span> 3<\/span> ||<\/span> s<\/span>[<\/span>0<\/span>]<\/span> !=<\/span> '0'<\/span> ||<\/span> s<\/span>[<\/span>1<\/span>]<\/span> !=<\/span> 'x'<\/span> &&<\/span> s<\/span>[<\/span>1<\/span>]<\/span> !=<\/span> 'X'<\/span> {<\/span>\r\n            return<\/span> false<\/span>\r\n        }<\/span>\r\n        for<\/span> _<\/span>,<\/span> c<\/span> :=<\/span> range<\/span> s<\/span>[<\/span>2<\/span>:<\/span>]<\/span> {<\/span>\r\n            if<\/span> c<\/span> <<\/span> '0'<\/span> ||<\/span> '9'<\/span> <<\/span> c<\/span> &&<\/span> c<\/span> <<\/span> 'A'<\/span> ||<\/span> 'F'<\/span> <<\/span> c<\/span> &&<\/span> c<\/span> <<\/span> 'a'<\/span> ||<\/span> 'f'<\/span> <<\/span> c<\/span> {<\/span>\r\n                return<\/span> false<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        return<\/span> true<\/span>\r\n    }<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        isHexString<\/span>(<\/span>s<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkStringMatchWithRegexp      2000000               643 ns\/op             0 B\/op         0 allocs\/op\r\nBenchmarkStringMatchWithoutRegexp   30000000               55.0 ns\/op           0 B\/op         0 allocs\/op\r\n<\/code><\/pre>\n
\u7b2c\u4e00\u500b\u756a\u5916\u7de8<\/h2>\n
\u867d\u7136\u4e0e\u6027\u80fd\u8c03\u4f18\u4e0d\u540c\uff0c\u4f46\u542f\u52a8goroutine\u4e5f\u662f\u9700\u8981\u6210\u672c\u7684\uff0c\u56e0\u6b64\u4e0d\u662f\u4ec5\u4ec5\u52a0\u4e0a”go”\u5c31\u80fd\u8ba9\u7a0b\u5e8f\u53d8\u5f97\u66f4\u5feb\uff0c\u76f8\u53cd\uff0c\u5bf9\u4e8e\u8f7b\u91cf\u7ea7\u7684\u5904\u7406\u6765\u8bf4\uff0c\u987a\u5e8f\u5904\u7406\u53cd\u800c\u66f4\u5feb\u3002<\/p>\n
package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"sync\"<\/span>\r\n    \"testing\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> BenchmarkGoroutine<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 10<\/span>\r\n    var<\/span> wg<\/span> sync<\/span>.<\/span>WaitGroup<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        wg<\/span>.<\/span>Add<\/span>(<\/span>n<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            go<\/span> func<\/span>()<\/span> {<\/span>\r\n                wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n            }()<\/span>\r\n        }<\/span>\r\n        wg<\/span>.<\/span>Wait<\/span>()<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkSequential<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 10<\/span>\r\n    var<\/span> wg<\/span> sync<\/span>.<\/span>WaitGroup<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        wg<\/span>.<\/span>Add<\/span>(<\/span>n<\/span>)<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> n<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            func<\/span>()<\/span> {<\/span>\r\n                wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n            }()<\/span>\r\n        }<\/span>\r\n        wg<\/span>.<\/span>Wait<\/span>()<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkGoroutine        500000              3097 ns\/op             164 B\/op       11 allocs\/op\r\nBenchmarkSequential     10000000               224 ns\/op               0 B\/op        0 allocs\/op\r\n<\/code><\/pre>\n
\u6211\u5bf9\u8fd9\u4e2a\u53cd\u8f6c\u7684\u9608\u503c\u6709\u5174\u8da3\uff0c\u60f3\u77e5\u9053\u5b83\u4f1a\u5728\u591a\u5927\u7a0b\u5ea6\u4e0a\u53d1\u751f\u3002<\/p>\n
\u7b2c\u4e8c\u500b\u984d\u5916\u7ae0\u7bc0<\/h2>\n
\u65e0\u8bba\u662f\u76f4\u63a5\u5728\u5faa\u73af\u4e2d\u7684\u6761\u4ef6\u90e8\u5206\u5199\u5165len()\uff0c\u8fd8\u662f\u5148\u5c06\u5176\u8d4b\u7ed9\u53d8\u91cf\u518d\u4f7f\u7528\uff0c\u90fd\u4e0d\u4f1a\u6709\u660e\u663e\u7684\u5dee\u5f02\u3002<\/p>\n
package<\/span> bench_test<\/span>\r\n\r\nimport<\/span> \"testing\"<\/span>\r\n\r\nfunc<\/span> BenchmarkLenDirect<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 1000<\/span>\r\n    s<\/span> :=<\/span> make<\/span>([]<\/span>string<\/span>,<\/span> n<\/span>)<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        for<\/span> j<\/span> :=<\/span> 0<\/span>;<\/span> j<\/span> <<\/span> len<\/span>(<\/span>s<\/span>);<\/span> j<\/span>++<\/span> {<\/span>\r\n            _<\/span> =<\/span> s<\/span>[<\/span>j<\/span>]<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> BenchmarkLenCached<\/span>(<\/span>b<\/span> *<\/span>testing<\/span>.<\/span>B<\/span>)<\/span> {<\/span>\r\n    n<\/span> :=<\/span> 1000<\/span>\r\n    s<\/span> :=<\/span> make<\/span>([]<\/span>string<\/span>,<\/span> n<\/span>)<\/span>\r\n    b<\/span>.<\/span>ResetTimer<\/span>()<\/span>\r\n    for<\/span> i<\/span> :=<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> b<\/span>.<\/span>N<\/span>;<\/span> i<\/span>++<\/span> {<\/span>\r\n        for<\/span> j<\/span>,<\/span> length<\/span> :=<\/span> 0<\/span>,<\/span> len<\/span>(<\/span>s<\/span>);<\/span> j<\/span> <<\/span> length<\/span>;<\/span> j<\/span>++<\/span> {<\/span>\r\n            _<\/span> =<\/span> s<\/span>[<\/span>j<\/span>]<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
BenchmarkLenDirect       1000000              1221 ns\/op               0 B\/op        0 allocs\/op\r\nBenchmarkLenCached       1000000              1221 ns\/op               0 B\/op        0 allocs\/op\r\n<\/code><\/pre>\n
\u603b\u7ed3<\/h2>\n
\u4e0d\u8981\u76f2\u76ee\u5730\u76f8\u4fe1\u8fd9\u6837\u7684\u6587\u7ae0\uff0c\u4f60\u9700\u8981\u6839\u636e\u81ea\u5df1\u7684\u6807\u51c6\u6765\u505a\u8bc4\u4f30\uff01<\/p>\n
\u8fd9\u7bc7\u6587\u7ae0\u6240\u4f7f\u7528\u7684\u57fa\u51c6\u6d4b\u8bd5\u53ef\u4ee5\u5728 https:\/\/github.com\/naoina\/go-adventcalendar-2014-bench \u627e\u5230\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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