On 2011-08-16 00:29, Daniel Lezcano wrote: > On 08/12/2011 11:51 PM, Papp Tamas wrote: >> hi! >> >> I'm asking you about limiting memory. >> >> This is the test config: >> lxc.cgroup.memory.limit_in_bytes = 16M >> lxc.cgroup.memory.memsw.limit_in_bytes = 1G >> lxc.cgroup.cpuset.cpus = 0-1 >> lxc.cgroup.cpu.shares = 1024 >> >> I run apt-get upgrade and an openfire server (java) as memory harvester >> jobs. >> >> 23:42:37 up 1:54, 3 users, load average: 3.08, 2.47, 1.42 >> >> $ vmstat 5 >> procs -----------memory---------- ---swap-- -----io---- -system-- >> ----cpu---- >> r b swpd free buff cache si so bi bo in cs us sy >> id wa >> 5 3 94952 2356752 79004 1051784 52 60 132 110 104 170 2 >> 1 94 4 >> 0 4 97280 2358896 79012 1051772 2105 2254 2105 2396 940 1163 2 >> 3 40 56 >> 0 1 98544 2358276 79036 1051764 1374 1060 1374 1177 493 963 1 >> 2 48 50 >> 0 4 99384 2358880 79056 1052460 1538 1432 4286 1526 727 1207 0 >> 2 38 59 >> 0 3 100596 2355212 79064 1052476 666 645 3718 718 483 1067 1 >> 3 37 59 >> 0 3 104132 2350996 79064 1052588 1039 1106 4606 1224 540 961 1 >> 2 41 56 >> 0 3 104488 2350376 79088 1052172 938 641 3624 756 505 865 0 >> 1 42 57 >> 1 3 103964 2349552 79096 1052568 642 426 3598 477 591 886 16 >> 1 26 56 >> 0 3 103860 2350008 79112 1052360 491 357 4277 434 850 957 39 >> 1 10 50 >> 0 4 104652 2350908 79112 1052056 738 746 5207 813 804 1049 23 >> 2 18 57 >> 0 2 106320 2350016 79120 1052464 825 706 5439 789 941 983 33 >> 1 13 53 >> 0 8 105540 2347444 79136 1052264 1185 290 4692 379 484 890 1 >> 1 34 64 >> 0 7 107756 2347000 79144 1052448 948 950 2970 1002 555 900 1 >> 2 36 62 >> 0 2 106868 2346528 79152 1052428 674 316 4130 402 446 825 1 >> 2 43 55 >> 0 2 104556 2346372 79160 1052160 570 261 3872 343 492 865 1 >> 3 40 55 >> 0 2 104976 2345504 79176 1052560 606 506 4298 612 444 839 1 >> 2 43 54 >> 0 2 104004 2345256 79184 1052476 442 277 3633 362 401 765 2 >> 2 40 55 >> 0 3 104000 2345248 79192 1052156 555 406 3237 493 475 792 2 >> 3 37 58 >> 0 7 105044 2344728 79200 1052156 854 775 3691 867 498 902 0 >> 2 40 58 >> 0 4 105036 2344472 79208 1052396 790 586 3428 668 477 865 1 >> 2 33 65 >> 0 4 105956 2344248 79216 1052372 590 487 4104 578 562 833 1 >> 2 35 62 >> 0 4 105268 2343496 79224 1052296 681 317 3506 399 425 793 1 >> 0 41 58 >> 0 2 105736 2343216 79232 1052284 394 284 3578 373 441 773 0 >> 1 45 54 >> 0 2 105072 2343464 79248 1052252 773 538 5720 632 534 908 0 >> 1 44 55 >> 0 2 105572 2342968 79256 1052560 436 342 4547 428 419 806 0 >> 1 46 52 >> 0 2 106000 2345108 79264 1052444 591 867 4534 946 525 862 1 >> 1 44 54 >> 1 3 103092 2345076 79280 1052220 906 234 4302 329 470 885 0 >> 1 42 57 >> 0 2 104636 2345200 79288 1052448 747 870 3556 942 548 886 0 >> 1 37 61 >> 0 4 105296 2344992 79296 1052152 489 451 3738 550 439 780 0 >> 1 44 55 >> 0 2 103968 2346372 79304 1052268 858 674 4669 778 578 913 1 >> 1 37 61 >> 0 2 104052 2346612 79312 1052672 425 346 3766 444 424 786 0 >> 1 46 53 >> 0 2 104476 2347364 79320 1052164 310 224 3352 294 410 747 0 >> 1 42 56 >> 0 2 105428 2347356 79328 1052520 408 456 4321 547 471 918 1 >> 1 45 53 >> 1 4 104384 2349720 79336 1052164 586 320 4389 417 482 828 0 >> 1 44 55 >> 0 3 104672 2350200 79352 1052136 462 378 3098 502 508 898 0 >> 2 38 60 >> 0 2 105584 2349820 79368 1052168 544 490 4173 583 501 814 0 >> 2 45 54 >> 0 2 105344 2349572 79376 1052524 514 266 4138 366 481 822 0 >> 1 44 55 >> 0 2 105488 2348580 79384 1052424 727 410 4162 492 514 839 0 >> 2 41 57 >> 0 2 103904 2350068 79400 1052544 1058 781 5232 886 583 926 0 >> 2 42 56 >> >> >> Before starting the container the swap usage was zero. >> >> The problem is all of the container start working slower, for example >> the lag of ssh sessions is increased. >> >> >> Is this a normal behaviour? I think, this paging should not do this. > If you reduce the memory for a container at a point where it swaps, > automatically that will reduce the performances of the whole system by > adding a lot of disk IO. > > Using the cgroup memory is like reducing the RAM. I am not sure 16M is > sufficient to run an apt-upgrade command. What are you trying to achieve > with 16M on your container ? What application today runs with 16MB of RAM ?
I set up 16M RAM only for testing purposes. Check si/so columns, doyou think it's swapping so much that explains it? I'm not sure, but I'm not an expert on this subject, that's why I'm asking you:) Thanks, tamas ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. Learn more about uberSVN and get a free download at: http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ Lxc-users mailing list Lxc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-users
