median of 5 runs per configuration (latency from a fixed-rate open loop; throughput from a closed loop)

configuration                      p50 ms         p99 ms       p99.9 ms         max ms     peak req/s         pauses   pause p99 ms   pause max ms pause total ms         RSS MB
g1                                   0.63           29.2          128.1          179.5           8900             65        111.576        111.576           1384           1205
zgc                                  0.60            7.4           17.3           36.4           7117            155          0.090          0.168              3           1250
shenandoah-satb                      0.78           14.9           43.6           86.4           5026            204          0.981          1.475             44           1212
shenandoah-generational              0.82         1557.5         1820.4         1864.7           5498            293          1.398          2.553             76           1227