Github user remkop commented on the issue:
https://github.com/apache/logging-log4j2/pull/87
As promised, here are the throughput results on enterprise hardware.
Hardware: total 64 cores (4x 16-core) Intel(R) Xeon(R) CPU E5-2697A v4 @
2.60GHz
Java Hotspot 64-bit server 1.8.0_112
Results look good: as soon as we introduce concurrency, the lock-free MMap
appender starts outperforming the other file appenders.
*1 thread*
```
{code}
-sh-4.2$ java -jar benchmarks.jar ".*Log4j2AppenderThroughput.*" -wi 5 -f 1
-i 10
Benchmark (loggerType)
(messageSizeBytes) Mode Samples Score Error Units
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender File
150 thrpt 10 1344494.961 ± 221110.545 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender RAF
150 thrpt 10 1563396.748 ± 12497.136 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender MMap
150 thrpt 10 1223215.440 ± 14661.487 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end File
150 thrpt 10 1008537.505 ± 9213.181 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end RAF
150 thrpt 10 998564.075 ± 12207.661 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end MMap
150 thrpt 10 785114.881 ± 8827.768 ops/s
{code}
```
*4 threads*
```
{code}
-sh-4.2$ java -jar benchmarks.jar ".*Log4j2AppenderThroughput.*" -wi 5 -f 1
-i 10 -t 4
Benchmark (loggerType)
(messageSizeBytes) Mode Samples Score Error Units
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender File
150 thrpt 10 1678485.793 ± 260632.925 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender RAF
150 thrpt 10 1412574.559 ± 447410.040 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender MMap
150 thrpt 10 1386414.915 ± 333117.992 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end File
150 thrpt 10 959662.994 ± 333541.548 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end RAF
150 thrpt 10 929405.390 ± 66673.436 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end MMap
150 thrpt 10 1013681.438 ± 155916.949 ops/s
{code}
```
*8 threads*
```
{code}
-sh-4.2$ java -jar benchmarks.jar ".*Log4j2AppenderThroughput.*" -wi 5 -f 1
-i 10 -t 8
Benchmark (loggerType)
(messageSizeBytes) Mode Samples Score Error Units
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender File
150 thrpt 10 1164538.492 ± 62482.965 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender RAF
150 thrpt 10 1194865.200 ± 72251.118 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender MMap
150 thrpt 10 1338960.644 ± 71104.991 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end File
150 thrpt 10 944670.900 ± 69190.255 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end RAF
150 thrpt 10 930248.735 ± 28523.086 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end MMap
150 thrpt 10 998676.286 ± 36327.805 ops/s
{code}
```
*16 threads*
```
{code}
-sh-4.2$ java -jar benchmarks.jar ".*Log4j2AppenderThroughput.*" -wi 5 -f 1
-i 10 -t 16
Benchmark (loggerType)
(messageSizeBytes) Mode Samples Score Error Units
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender File
150 thrpt 10 1214786.965 ± 7217.940 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender RAF
150 thrpt 10 1192036.036 ± 13696.830 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender MMap
150 thrpt 10 1548961.297 ± 27141.206 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end File
150 thrpt 10 1003235.059 ± 10365.921 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end RAF
150 thrpt 10 994834.287 ± 9057.470 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end MMap
150 thrpt 10 1323043.186 ± 19960.127 ops/s
{code}
```
*32 threads*
```
{code}
-sh-4.2$ java -jar benchmarks.jar ".*Log4j2AppenderThroughput.*" -wi 5 -f 1
-i 10 -t 32
Benchmark (loggerType)
(messageSizeBytes) Mode Samples Score Error Units
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender File
150 thrpt 10 1372729.015 ± 40762.524 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender RAF
150 thrpt 10 1185351.707 ± 16992.542 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender MMap
150 thrpt 10 1784377.615 ± 179359.793 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end File
150 thrpt 10 918029.971 ± 38434.750 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end RAF
150 thrpt 10 1122310.566 ± 152840.084 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end MMap
150 thrpt 10 1898762.678 ± 81312.274 ops/s
{code}
```
*64 threads*
```
{code}
-sh-4.2$ java -jar benchmarks.jar ".*Log4j2AppenderThroughput.*" -wi 5 -f 1
-i 10 -t 64
Benchmark (loggerType)
(messageSizeBytes) Mode Samples Score Error Units
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender File
150 thrpt 10 1193371.846 ± 32893.485 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender RAF
150 thrpt 10 1231136.529 ± 26895.411 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.appender MMap
150 thrpt 10 1409277.639 ± 91900.204 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end File
150 thrpt 10 881261.726 ± 35023.552 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end RAF
150 thrpt 10 929691.738 ± 22616.873 ops/s
o.a.l.l.p.j.Log4j2AppenderThroughputBenchmark.end2end MMap
150 thrpt 10 1216108.561 ± 41321.530 ops/s
{code}
```
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