[logback-dev] [JIRA] (LOGBACK-1279) Async appenders do not scale well across multiple threads

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Ceki Gülcü commented on LOGBACK-1279   Re: Async appenders do not scale well across multiple threads The AsyncFileAppender performance test is now in a separate file. Each benchmark, in addition to logging performs an additional operation taking a few microseconds, aka the baseline. The baseline duration is a benchmark parameter. When the baseline duration approaches 1 over the AsyncAppender logging throughput, the cost of AsyncAppender becomes invisible. Here is the command to run the benchmark test: java -jar target/benchmarks.jar ".*AsyncFileAppenderBenchmark.*" -f 1 -bm avgt -tu us -wi 5 -i 10 -t 16 Here are the results with 16 threads Benchmark (powerOf2) Mode Cnt Score Error Units AsyncFileAppenderBenchmark.baseline 8 avgt 10 4.116 ± 0.107 us/op AsyncFileAppenderBenchmark.baseline 10 avgt 10 16.356 ± 0.602 us/op AsyncFileAppenderBenchmark.baseline 12 avgt 10 66.020 ± 2.877 us/op AsyncFileAppenderBenchmark.baseline 14 avgt 10 274.693 ± 23.184 us/op AsyncFileAppenderBenchmark.log4j1File 8 avgt 10 18.592 ± 0.305 us/op AsyncFileAppenderBenchmark.log4j1File 10 avgt 10 29.431 ± 0.529 us/op AsyncFileAppenderBenchmark.log4j1File 12 avgt 10 70.657 ± 2.448 us/op AsyncFileAppenderBenchmark.log4j1File 14 avgt 10 272.282 ± 3.867 us/op AsyncFileAppenderBenchmark.log4j2RAF 8 avgt 10 14.797 ± 0.162 us/op AsyncFileAppenderBenchmark.log4j2RAF 10 avgt 10 23.318 ± 0.415 us/op AsyncFileAppenderBenchmark.log4j2RAF 12 avgt 10 64.871 ± 0.827 us/op AsyncFileAppenderBenchmark.log4j2RAF 14 avgt 10 257.394 ± 3.796 us/op AsyncFileAppenderBenchmark.logbackFile 8 avgt 10 54.249 ± 0.575 us/op AsyncFileAppenderBenchmark.logbackFile 10 avgt 10 50.049 ± 0.356 us/op AsyncFileAppenderBenchmark.logbackFile 12 avgt 10 73.832 ± 2.264 us/op AsyncFileAppenderBenchmark.logbackFile 14 avgt 10 268.423 ± 6.736 us/op Here are the results with 32 threads Benchmark                               (powerOf2)  Mode  Cnt    Score    Error  Units AsyncFileAppenderBenchmark.baseline              8  avgt   10    8.204 ±  0.136  us/op AsyncFileAppenderBenchmark.baseline             10  avgt   10   32.935 ±  0.913  us/op AsyncFileAppenderBenchmark.baseline             12  avgt   10  129.007 ±  2.421  us/op AsyncFileAppenderBenchmark.baseline             14  avgt   10  547.678 ± 26.003  us/op AsyncFileAppenderBenchmark.log4j1File            8  avgt   10   39.147 ±  6.186  us/op AsyncFileAppenderBenchmark.log4j1File           10  avgt   10   58.539 ±  1.001  us/op AsyncFileAppenderBenchmark.log4j1File           12  avgt   10  150.811 ±  8.552  us/op AsyncFileAppenderBenchmark.log4j1File           14  avgt   10  579.674 ± 25.329  us/op AsyncFileAppenderBenchmark.log4j2RAF             8  avgt   10   32.096 ±  2.859  us/op AsyncFileAppenderBenchmark.log4j2RAF            10  avgt   10   47.249 ±  0.910  us/op AsyncFileAppenderBenchmark.log4j2RAF            12  avgt   10  133.443 ±  2.474  us/op AsyncFileAppenderBenchmark.log4j2RAF            14  avgt   10  513.933 ± 15.221  us/op AsyncFileAppenderBenchmark.logbackFile           8  avgt   10  113.088 ±  1.204  us/op AsyncFileAppenderBenchmark.logbackFile          10  avgt   10  119.610 ±  3.122  us/op AsyncFileAppenderBenchmark.logbackFile          12  avgt   10  165.772 ±  2.294  us/op AsyncFileAppenderBenchmark.logbackFile          14  avgt   10  552.415 ± 15.728  us/op I don't understand why the base line cost increases with the number of threads but the gist should come across. Add Comment   This message was sent by Atlassian JIRA (v7.3.1#73012-sha1:68837e3)

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