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Posted to commits@harmony.apache.org by "Xiao-Feng Li (JIRA)" <ji...@apache.org> on 2007/05/21 09:16:16 UTC
[jira] Commented: (HARMONY-3906) [drlvm][gc_gen]Significant
performance degradation after switch on GC v5
[ https://issues.apache.org/jira/browse/HARMONY-3906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12497367 ]
Xiao-Feng Li commented on HARMONY-3906:
---------------------------------------
Pavel, I tried your test case on my desktop, the result didn't show big time difference， as given below:
========================GCv4.1=============================
C:\temp>java.exe -XX:vm.dlls=gc_cc.dll -classpath . ExceptionsWeakRefBenchmark
threads quantity = 1
633 414 301 243 183
3559 2032 1218 826 440
707 471 348 290 230
3820 2230 1456 1068 681
threads quantity = 2
378 241 179 144 109
2186 1215 733 468 253
414 277 214 180 141
2258 1328 865 622 404
threads quantity = 4
385 247 182 151 117
2151 1219 732 472 255
423 291 219 198 143
2280 1347 855 617 397
threads quantity = 8
387 250 178 146 114
2080 1206 709 474 256
420 284 212 178 144
2242 1308 843 620 398
threads quantity = 16
405 247 186 149 115
2115 1215 753 500 269
418 284 220 181 146
2256 1367 850 609 404
PASSED
========================GCv5=============================
C:\temp>java.exe -classpath . ExceptionsWeakRefBenchmark
threads quantity = 1
639 415 298 242 182
3522 1997 1228 838 448
702 470 351 292 236
3782 2248 1467 1092 699
threads quantity = 2
387 263 189 147 117
2241 1214 703 501 275
419 280 212 178 147
2313 1379 853 663 407
threads quantity = 4
395 247 185 152 113
2074 1178 715 489 271
417 290 214 186 149
2283 1325 864 616 408
threads quantity = 8
382 253 187 154 118
2077 1193 716 500 268
417 281 215 183 148
2226 1307 844 611 425
threads quantity = 16
388 257 183 151 118
2062 1154 712 498 270
420 292 220 186 156
2217 1312 865 642 451
PASSED
==================================================================
I wonder if the data above are reasonable， and please advise how I can reproduce it. Thanks.
> [drlvm][gc_gen]Significant performance degradation after switch on GC v5
> ------------------------------------------------------------------------
>
> Key: HARMONY-3906
> URL: https://issues.apache.org/jira/browse/HARMONY-3906
> Project: Harmony
> Issue Type: Bug
> Components: DRLVM
> Reporter: Pavel Afremov
> Assigned To: Xiao-Feng Li
> Attachments: ExceptionsWeakRefBenchmark.java
>
>
> I found out significant performance degradation of class unloading support after switch on GC v5. On 1 processor machine performance degradation in micro benchmark from HARMONY-3845 can reach 10 times, on 4 HT processors degradation reaches up 80 times. It is 1000% and 8000% correspondently!
> I developed additional benchmark, which shows this problem without any changes in VM. You can find it in attachment.
> Of cause it's a synthetic benchmark. I didn't find any performance issues on specJVM and specJBB.
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