> Intuitively, I would have never thought that it was > /possible/ to run 160 or so instances of Tomcat on > anything but some type of very expensive hardware.
I assure you that it works admirably! And each of the instances runs a sophisticated medical application with hundreds of JSPs and class files. > The data above, and your comments, seem to make unlikely > the OOM hypothesis, unless you have one application suddenly > acting up. Also, we run a script that checks the logs for OOM errors and those are not showing up. > On which of those servers is the one Tomcat instance dying ? > on both ? Both occasionally. But now that we're digging into it, it has not happened for several days on either one. :-/ > Is that Tomcat instance running an application > which the other ones don't ? They all run copies of the same application, albeit slightly different versions. But the one that is shutting down is running the same version as other instances that are not shutting down. > What kind of memory usage do the Tomcat instances have > (in total, including the Heap) ? Depends on which server and when you check. Right now on app03: [r...@app03 ~]# ps axo rss,vsz,comm,pid|grep java|sort -g 44984 251104 java 9151 47972 251876 java 10753 50816 253200 java 19077 59540 253160 java 17079 61780 254840 java 12740 73196 244908 java 26675 76580 252984 java 29065 78224 262196 java 981 89080 255308 java 17223 93968 255196 java 13046 98272 256228 java 17481 99440 256012 java 25020 101744 264704 java 9529 106160 258664 java 19425 108476 257452 java 26549 109712 266980 java 8853 113688 261296 java 14086 117596 270040 java 26159 118356 269264 java 8912 121316 270460 java 10800 123248 263196 java 5202 125764 257728 java 28540 126544 258128 java 7774 128084 267096 java 25420 128448 267420 java 13290 128508 259092 java 29286 129588 258800 java 21942 130068 265700 java 12465 130924 260472 java 29974 131484 268980 java 8812 132208 261088 java 7585 132560 268264 java 17343 133632 264320 java 16501 134232 261116 java 29183 135548 269132 java 10609 136932 273096 java 28742 140224 273052 java 12246 140624 274484 java 15351 141780 263020 java 12765 144948 264512 java 9292 148512 276672 java 9300 148900 267820 java 9547 150448 724588 java 12883 152224 270336 java 13083 153040 271260 java 9236 153300 293472 java 9634 153648 276708 java 31556 154324 272836 java 9041 154520 265512 java 9894 155176 272788 java 11453 155940 271532 java 10843 155940 274996 java 15897 156920 273980 java 8772 157240 271088 java 28906 157596 273128 java 16910 158852 275100 java 16096 160516 267404 java 8813 161060 279840 java 11403 161840 277244 java 11150 162176 274532 java 11876 162508 271484 java 9341 162672 274292 java 13402 162960 274220 java 10226 163460 279256 java 25700 163840 282796 java 9988 164248 277304 java 18237 164800 277576 java 26965 164928 278300 java 32556 164992 274972 java 11334 165284 282936 java 9587 165608 275548 java 6217 165992 277956 java 24426 166180 271832 java 18542 166548 274660 java 10662 167004 277668 java 10179 167064 284676 java 9386 167656 278904 java 12672 167712 278332 java 6112 167716 278484 java 715 168052 278188 java 3376 168224 274312 java 2910 168720 277072 java 32519 170104 274900 java 7194 170864 278304 java 16399 171036 275596 java 10375 171392 279968 java 12195 171884 281372 java 11207 172716 276524 java 23927 173192 279232 java 2755 173636 279772 java 11569 173688 278308 java 18800 174560 277796 java 10721 174660 279300 java 31576 175448 278176 java 12907 175784 287360 java 9198 176632 281812 java 15212 177588 293016 java 11750 178272 282860 java 19846 178704 280868 java 12023 179476 283092 java 28283 182580 283768 java 18964 183496 284244 java 15746 184928 282928 java 9942 185100 287952 java 30676 186124 288888 java 16051 186312 294096 java 9100 187360 305840 java 29874 190032 303316 java 11266 190616 292284 java 15054 191056 291612 java 10280 192256 291188 java 10098 192900 292848 java 10935 193132 287036 java 1986 196076 300276 java 10042 196460 302416 java 9967 197840 308108 java 14775 197912 291812 java 9854 198336 306508 java 1688 199552 311776 java 19234 200184 306876 java 14413 201132 309984 java 17799 204824 313368 java 13146 205136 310404 java 11031 206208 312032 java 18016 207116 310244 java 32263 207632 297772 java 15668 208404 305860 java 8734 208668 316744 java 9813 209960 311528 java 19346 210196 312944 java 14085 210248 310976 java 30073 212204 317592 java 30448 212256 316912 java 13032 212492 317780 java 10984 213128 309752 java 11801 214236 314068 java 12344 215596 320272 java 18188 216080 317312 java 17917 217160 311804 java 7073 217360 313656 java 20060 217856 320292 java 15051 218236 317512 java 14922 221620 317980 java 5873 221848 320096 java 12812 224772 323984 java 16675 227464 334344 java 16750 230412 322308 java 16218 235400 352016 java 1127 235516 339468 java 31681 238000 341372 java 2794 243416 361304 java 13202 252400 352100 java 19814 252836 350860 java 13547 261732 356168 java 12613 304756 393312 java 7747 364600 491072 java 5101 <--Here's the occasional bad boy 396240 503424 java 15556 399472 739912 java 30979 412684 522140 java 15828 601184 740096 java 6090 614564 733536 java 19163 622328 773108 java 21707 629036 750472 java 5503 And on app04... [r...@app04 ~]# ps axo rss,vsz,comm,pid|grep java|sort -g 57724 254164 java 20550 58552 254648 java 20477 68976 704456 java 8949 69044 704520 java 8877 69368 704880 java 9357 70592 705560 java 8761 71428 704560 java 12263 71832 704604 java 16067 72832 705500 java 15760 73100 705500 java 15846 73116 706156 java 12142 73280 707036 java 11594 74484 704904 java 19899 75144 705796 java 8573 75148 705900 java 16335 76588 707580 java 18092 76612 707564 java 19510 76624 707560 java 19422 76828 707784 java 17730 76972 712048 java 10581 80896 710204 java 19822 88420 248424 java 20294 90164 715000 java 13688 90904 249056 java 31472 92492 247816 java 20225 95012 713452 java 9241 99796 254544 java 19955 100392 254008 java 27814 104668 722816 java 11063 110360 718232 java 11996 114592 724312 java 9296 116844 715536 java 8721 118700 712580 java 12803 119436 715904 java 10440 121788 254272 java 19272 125160 717432 java 11394 126572 719056 java 10959 128220 716864 java 19345 130120 736520 java 9457 130632 721272 java 9109 132704 716616 java 14898 132724 721124 java 12498 132928 721304 java 11155 134844 718220 java 8687 134976 718860 java 11834 136908 718156 java 13089 137764 718056 java 16815 137984 719912 java 18675 141164 725420 java 10019 141776 723256 java 11703 143368 722312 java 10628 143468 723848 java 12936 143708 723344 java 10912 144340 719792 java 9151 144892 714784 java 19712 146540 729248 java 11651 147972 717152 java 9733 148340 725520 java 11445 148564 723112 java 10201 150920 721160 java 9196 151932 729708 java 30865 153476 725488 java 10485 153872 727864 java 15905 153984 723652 java 17409 155172 717676 java 15167 155316 725368 java 11108 156276 715884 java 14742 159352 723208 java 10675 161060 727472 java 9968 162728 725000 java 10355 163572 726664 java 11010 163584 725524 java 10812 164540 728712 java 11349 166196 723012 java 8649 166336 724284 java 9780 167164 725612 java 10393 170228 740788 java 10156 172012 720144 java 10064 174304 716784 java 17273 174532 732936 java 11253 175540 725636 java 11501 180384 731224 java 11198 182580 739276 java 9641 182664 725020 java 15477 188560 722140 java 13359 191072 725832 java 16182 191644 723472 java 9419 192040 725712 java 18245 192296 729044 java 9867 192312 721156 java 13568 193108 722264 java 10859 195128 728516 java 15115 196988 728348 java 17919 197176 728348 java 9021 198208 732976 java 10760 200680 730128 java 8915 202100 727268 java 17611 203736 729252 java 13433 204516 727428 java 17157 210064 726256 java 8835 210200 720956 java 16539 212644 728452 java 15251 215072 729040 java 18326 215308 731744 java 18384 215824 729712 java 13303 215956 737092 java 9688 216944 734224 java 9825 217508 728696 java 9554 217640 723284 java 8611 223764 726140 java 12580 227700 734256 java 10111 228372 333316 java 13733 228704 728684 java 15309 230384 739248 java 11543 234760 730616 java 17809 234944 737760 java 31312 235964 734200 java 17488 236220 730264 java 13211 236920 729784 java 12496 237044 727368 java 15593 237088 725664 java 19162 238108 738512 java 9923 238968 729736 java 16923 239792 733860 java 16761 240952 749396 java 14819 242188 719332 java 19605 245164 726040 java 18429 246656 724124 java 12351 255040 726388 java 16451 255472 730544 java 18606 260656 736716 java 18187 261236 724660 java 14605 262044 725720 java 19556 263172 729056 java 486 270464 728988 java 18523 273688 732928 java 19121 277432 729352 java 18470 283376 763044 java 17050 285500 727892 java 18867 291040 732404 java 12670 294008 731052 java 12882 301480 735372 java 13628 304224 725820 java 12760 309376 726396 java 18933 311780 735440 java 9502 313860 742148 java 10297 319984 731772 java 18731 344632 734584 java 14528 353688 730104 java 13483 374108 733288 java 17265 390840 729440 java 12978 404984 727700 java 11883 432752 766520 java 10537 497380 743672 java 14219 531704 744664 java 14656 534164 729548 java 18014 539992 736864 java 9597 542228 733612 java 19211 575672 734008 java 15038 604780 746120 java 31131 <--Here's the occasional bad boy. 604892 751856 java 10243 605168 751156 java 15380 605736 737988 java 16616 609016 731540 java 19261 > Do you start them with any kind of other memory-related > parameter for the JVM apart from -Xms and -Xmx ? 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