[AVRO-1089] Avro-C - Penalty 30x to 50x for using resolved writer on arrays

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6.3, 1.7.0
• Fix Version/s: 1.7.3
• Component/s: c

Environment

Ubuntu Linux

• Assignee: Unassigned
• Reporter: Vivek Nadkarni
• Created: 14/May/12 08:28
• Updated: 10/Dec/12 17:57
• Resolved: 01/Dec/12 17:04

Description

The new performance tests created in AVRO-1088 show that using the
resolved writer takes 30 to 50 times longer than using no schema
resolution or using the resolved reader for simple and nested arrays.

For a simple array, using the resolved writer took ~30x longer than
using the memory reader that assumed a matching schema. For the nested
array, using the resolved writer took ~50x longer.

These results suggest that there is a bug in resolved writer. I do not
have a proposed fix at this time.

• • • • Running simple array matched schemas ****
        250000 tests per run
        Run 1
        Run 2
        Run 3
        Average time: 2.123s
        Tests/sec: 117739
      • Running simple array resolved writer ****
        10000 tests per run
        Run 1
        Run 2
        Run 3
        Average time: 2.747s
        Tests/sec: 3641

• • • • Running nested array matched schemas ****
        250000 tests per run
        Run 1
        Run 2
        Run 3
        Average time: 3.030s
        Tests/sec: 82508
      • Running nested array resolved writer ****
        10000 tests per run
        Run 1
        Run 2
        Run 3
        Average time: 6.650s
        Tests/sec: 1504