go/uuid
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6 Commits

Author SHA1 Message Date
Bryan Matsuo
7508f98c71 optimize internal parsing function -- avoid unsafe []byte parsing 
Making xtob take two byte arguments avoids a lot of slicing.  This makes
the Parse function faster.  In addition, because so much slicing is
avoiding, duplicating the parse logic to ParseBytes resulted in the
function being faster than Parse (<1ns).

The BenchmarkParseBytesNative function has been removed (parseBytes was
identical to ParseBytes).  And a new benchmark,
BenchmarkParseBytesUnsafe, has been added to benchmark the old way of
parsing []byte (which is slightly slower than Parse and thus the new
ParseBytes implementation).

    benchmark                         old ns/op     new ns/op     delta
    BenchmarkUUID_MarshalJSON-4       685           667           -2.63%
    BenchmarkUUID_UnmarshalJSON-4     1145          1162          +1.48%
    BenchmarkParse-4                  61.6          56.5          -8.28%
    BenchmarkParseBytes-4             65.7          55.9          -14.92%
    BenchmarkParseBytesCopy-4         121           115           -4.96%
    BenchmarkNew-4                    1665          1643          -1.32%
    BenchmarkUUID_String-4            112           113           +0.89%
    BenchmarkUUID_URN-4               117           119           +1.71%

    benchmark                         old allocs     new allocs     delta
    BenchmarkUUID_MarshalJSON-4       4              4              +0.00%
    BenchmarkUUID_UnmarshalJSON-4     2              2              +0.00%
    BenchmarkParse-4                  0              0              +0.00%
    BenchmarkParseBytes-4             0              0              +0.00%
    BenchmarkParseBytesCopy-4         1              1              +0.00%
    BenchmarkNew-4                    1              1              +0.00%
    BenchmarkUUID_String-4            1              1              +0.00%
    BenchmarkUUID_URN-4               1              1              +0.00%

    benchmark                         old bytes     new bytes     delta
    BenchmarkUUID_MarshalJSON-4       248           248           +0.00%
    BenchmarkUUID_UnmarshalJSON-4     248           248           +0.00%
    BenchmarkParse-4                  0             0             +0.00%
    BenchmarkParseBytes-4             0             0             +0.00%
    BenchmarkParseBytesCopy-4         48            48            +0.00%
    BenchmarkNew-4                    16            16            +0.00%
    BenchmarkUUID_String-4            48            48            +0.00%
    BenchmarkUUID_URN-4               48            48            +0.00%
 2016-02-25 21:48:37 -08:00
Paul Borman
9e951e1b07 Change a UUID from []byte to [16]byte along with other API changes. 2016-02-19 12:30:25 -08:00
Bryan Matsuo
4e1e17316e use arrays in Parse() for reduced allocation cost and bounds checks 
An array is also for hex digit value lookups which seemed to reliably
give a few ns reduction in time.
 2015-10-10 21:12:40 -07:00
Paul Borman
2a573a0b4d Move code up one directory 2015-06-03 14:39:07 -07:00
Paul Borman
808d470594 uuid: source re-organization 
Move source to uuid subdirectory.
Add in coderviewability.

R=rsc
CC=borman
http://codereview.appspot.com/4838053
 2011-08-08 14:34:29 -07:00
Paul Borman
e130d97558 Initial checking of the go-uuid code. 2011-08-08 11:45:10 -07:00