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From zentol <...@git.apache.org>
Subject [GitHub] incubator-flink pull request: Serialized String comparison, Unicod...
Date Fri, 13 Jun 2014 13:41:14 GMT
Github user zentol commented on the pull request:

    https://github.com/apache/incubator-flink/pull/4#issuecomment-46012075
  
    the new serialization seems to take longer, but broke even due to faster deserialization.
    
    some comparison benchmarks:
    
    strings of length 90
    1000 repetitions
    code for New measurement:
    ```
    long startTime = System.nanoTime();
    cmp = StringValue.compareUnicode(in1, in2);
    long endTime = System.nanoTime();
    ```
    code for Old measurement:
    ```
    long startTime = System.nanoTime();
    cmp = StringValue.readString(in1).compareTo(StringValue.readString(in2));
    long endTime = System.nanoTime();
    ```
    
    result = SUM(endTime - startTime) / 1000
    
    equality
    New 26627
    Old 25782
    
    affix (difference in the beginning of the sring)
    New 4259
    Old 23431
    
    infix (difference in the middle of the string)
    New 13560
    Old 30757
    
    suffix (difference at the end of the string)
    New 29385
    Old 28293
    
    not particularly surprising results. no progress on the prefix-issue :/
    
    adding some more tests now.


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