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Add shenandoah-jdk28: generational vs SATB Shenandoah, G1 and ZGC on a Spring Boot service (JEP 535 status probe included)

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HmvoHH3ZnCEaPNXRpDxDZe
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Claude
2026-10-24 10:53:17 +00:00
parent df13a904d7
commit b25bd65d4b
14 changed files with 460 additions and 0 deletions
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shenandoah-jdk28/output/01-gc-mode-probe.txt
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== JDK 25: OpenJDK 64-Bit Server VM Temurin-25.0.5+8 (build 25.0.5+8-LTS, mixed mode, sharing)
-- java -XX:+UseShenandoahGC -Xlog:gc+init -version
[0.009s][info][gc,init] Mode: Snapshot-At-The-Beginning (SATB)
-- java -XX:+UseShenandoahGC -XX:+PrintFlagsFinal -version (ShenandoahGCMode)
ccstr ShenandoahGCMode = satb {product} {default}
-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xlog:gc+init -version
[0.009s][info][gc,init] Mode: Generational
-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=satb -Xlog:gc+init -version
[0.007s][info][gc,init] Mode: Snapshot-At-The-Beginning (SATB)
== JDK 28 EA: OpenJDK 64-Bit Server VM Temurin-28+21-202610221655 (build 28-beta+21-ea, mixed mode, sharing)
-- java -XX:+UseShenandoahGC -Xlog:gc+init -version
[0.006s][info][gc,init] Mode: Snapshot-At-The-Beginning (SATB)
-- java -XX:+UseShenandoahGC -XX:+PrintFlagsFinal -version (ShenandoahGCMode)
ccstr ShenandoahGCMode = satb {product} {default}
-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xlog:gc+init -version
[0.008s][info][gc,init] Mode: Generational
-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=satb -Xlog:gc+init -version
[0.007s][info][gc,init] Mode: Snapshot-At-The-Beginning (SATB)
shenandoah-jdk28/output/02-runs.txt
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label=g1 rep=1 target=3000 achieved=3000.0 requests=180000 p50_ms=0.61 p99_ms=28.69 p999_ms=95.48 max_ms=154.41 errors=0 peak_rps=8399.5 pauses=65 pause_p50_ms=23.459 pause_p99_ms=115.550 pause_max_ms=115.550 pause_total_ms=1349.5 rss_peak_mb=1205 heap_committed_mb=1024
label=zgc rep=1 target=3000 achieved=3000.0 requests=180000 p50_ms=0.60 p99_ms=7.32 p999_ms=65.10 max_ms=108.85 errors=0 peak_rps=7540.4 pauses=158 pause_p50_ms=0.014 pause_p99_ms=0.060 pause_max_ms=0.141 pause_total_ms=2.6 rss_peak_mb=1250 heap_committed_mb=1024
label=shenandoah-satb rep=1 target=3000 achieved=3000.0 requests=180000 p50_ms=0.80 p99_ms=14.94 p999_ms=29.12 max_ms=53.70 errors=0 peak_rps=5025.8 pauses=204 pause_p50_ms=0.165 pause_p99_ms=0.945 pause_max_ms=1.125 pause_total_ms=44.1 rss_peak_mb=1213 heap_committed_mb=1024
label=shenandoah-generational rep=1 target=3000 achieved=3000.0 requests=180000 p50_ms=0.89 p99_ms=1557.51 p999_ms=1866.05 max_ms=1906.45 errors=0 peak_rps=5484.3 pauses=319 pause_p50_ms=0.170 pause_p99_ms=1.236 pause_max_ms=1.418 pause_total_ms=76.5 rss_peak_mb=1227 heap_committed_mb=1024
label=g1 rep=2 target=3000 achieved=3000.0 requests=180000 p50_ms=0.66 p99_ms=29.17 p999_ms=128.06 max_ms=179.49 errors=0 peak_rps=8899.7 pauses=63 pause_p50_ms=24.557 pause_p99_ms=110.232 pause_max_ms=110.232 pause_total_ms=1366.7 rss_peak_mb=1207 heap_committed_mb=1024
label=zgc rep=2 target=3000 achieved=3000.0 requests=180000 p50_ms=0.60 p99_ms=6.98 p999_ms=15.80 max_ms=33.36 errors=0 peak_rps=7060.8 pauses=154 pause_p50_ms=0.014 pause_p99_ms=0.090 pause_max_ms=0.183 pause_total_ms=2.6 rss_peak_mb=1241 heap_committed_mb=1024
label=shenandoah-satb rep=2 target=3000 achieved=3000.0 requests=180000 p50_ms=0.78 p99_ms=14.58 p999_ms=27.28 max_ms=56.25 errors=0 peak_rps=4542.2 pauses=204 pause_p50_ms=0.160 pause_p99_ms=0.981 pause_max_ms=1.067 pause_total_ms=46.0 rss_peak_mb=1212 heap_committed_mb=1024
label=shenandoah-generational rep=2 target=3000 achieved=3000.0 requests=180000 p50_ms=0.93 p99_ms=3077.07 p999_ms=3222.87 max_ms=3284.93 errors=0 peak_rps=5497.7 pauses=328 pause_p50_ms=0.184 pause_p99_ms=1.544 pause_max_ms=209.368 pause_total_ms=292.7 rss_peak_mb=1219 heap_committed_mb=1024
label=g1 rep=3 target=3000 achieved=3000.0 requests=180000 p50_ms=0.65 p99_ms=29.18 p999_ms=137.90 max_ms=194.77 errors=0 peak_rps=9385.5 pauses=65 pause_p50_ms=24.353 pause_p99_ms=123.149 pause_max_ms=123.149 pause_total_ms=1383.9 rss_peak_mb=1203 heap_committed_mb=1024
label=zgc rep=3 target=3000 achieved=3000.0 requests=180000 p50_ms=0.62 p99_ms=7.37 p999_ms=15.73 max_ms=36.38 errors=0 peak_rps=7816.9 pauses=156 pause_p50_ms=0.014 pause_p99_ms=0.099 pause_max_ms=0.184 pause_total_ms=2.6 rss_peak_mb=1257 heap_committed_mb=1024
label=shenandoah-satb rep=3 target=3000 achieved=3000.0 requests=180000 p50_ms=0.69 p99_ms=811.54 p999_ms=1116.58 max_ms=1186.35 errors=0 peak_rps=5402.7 pauses=213 pause_p50_ms=0.144 pause_p99_ms=1.012 pause_max_ms=2.851 pause_total_ms=43.8 rss_peak_mb=1212 heap_committed_mb=1024
label=shenandoah-generational rep=3 target=3000 achieved=3000.0 requests=180000 p50_ms=0.82 p99_ms=24.49 p999_ms=103.01 max_ms=150.61 errors=0 peak_rps=5270.0 pauses=282 pause_p50_ms=0.172 pause_p99_ms=1.398 pause_max_ms=2.988 pause_total_ms=72.0 rss_peak_mb=1229 heap_committed_mb=1024
label=g1 rep=4 target=3000 achieved=3000.0 requests=180000 p50_ms=0.63 p99_ms=42.72 p999_ms=117.79 max_ms=146.07 errors=0 peak_rps=8847.7 pauses=55 pause_p50_ms=25.266 pause_p99_ms=111.576 pause_max_ms=111.576 pause_total_ms=1693.4 rss_peak_mb=1205 heap_committed_mb=1024
label=zgc rep=4 target=3000 achieved=3000.0 requests=180000 p50_ms=0.67 p99_ms=7.98 p999_ms=17.28 max_ms=31.52 errors=0 peak_rps=6923.5 pauses=155 pause_p50_ms=0.015 pause_p99_ms=0.097 pause_max_ms=0.168 pause_total_ms=3.0 rss_peak_mb=1250 heap_committed_mb=1024
label=shenandoah-satb rep=4 target=3000 achieved=3000.0 requests=180000 p50_ms=0.87 p99_ms=21.25 p999_ms=43.63 max_ms=86.39 errors=0 peak_rps=4639.2 pauses=210 pause_p50_ms=0.163 pause_p99_ms=0.743 pause_max_ms=1.475 pause_total_ms=44.1 rss_peak_mb=1209 heap_committed_mb=1024
label=shenandoah-generational rep=4 target=3000 achieved=3000.0 requests=180000 p50_ms=0.75 p99_ms=1657.87 p999_ms=1820.38 max_ms=1864.68 errors=0 peak_rps=5519.6 pauses=293 pause_p50_ms=0.177 pause_p99_ms=2.230 pause_max_ms=2.553 pause_total_ms=76.6 rss_peak_mb=1220 heap_committed_mb=1024
label=g1 rep=5 target=3000 achieved=3000.0 requests=180000 p50_ms=0.60 p99_ms=66.31 p999_ms=379.56 max_ms=423.34 errors=0 peak_rps=9775.1 pauses=70 pause_p50_ms=25.645 pause_p99_ms=101.489 pause_max_ms=101.489 pause_total_ms=1443.9 rss_peak_mb=1202 heap_committed_mb=1024
label=zgc rep=5 target=3000 achieved=3000.0 requests=180000 p50_ms=0.59 p99_ms=7.49 p999_ms=48.76 max_ms=83.78 errors=0 peak_rps=7117.4 pauses=147 pause_p50_ms=0.014 pause_p99_ms=0.080 pause_max_ms=0.112 pause_total_ms=2.4 rss_peak_mb=1243 heap_committed_mb=1024
label=shenandoah-satb rep=5 target=3000 achieved=3000.0 requests=180000 p50_ms=0.64 p99_ms=12.71 p999_ms=62.14 max_ms=101.88 errors=0 peak_rps=5448.0 pauses=191 pause_p50_ms=0.147 pause_p99_ms=1.192 pause_max_ms=1.512 pause_total_ms=36.9 rss_peak_mb=1214 heap_committed_mb=1024
label=shenandoah-generational rep=5 target=3000 achieved=3000.0 requests=180000 p50_ms=0.72 p99_ms=691.58 p999_ms=916.21 max_ms=959.93 errors=0 peak_rps=5745.0 pauses=277 pause_p50_ms=0.176 pause_p99_ms=1.283 pause_max_ms=1.359 pause_total_ms=67.2 rss_peak_mb=1231 heap_committed_mb=1024
shenandoah-jdk28/output/03-summary.txt
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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