Re: too much migrations?

To take advantage of process load-balancing you want to start n+1
parallel processes.

Roger


On 4/14/06, Maurice Libes <[email protected]> wrote:
>
> hi to all
>
> i ask again an old question because i don't know if such an amount of
> migration (here below)  between nodes is normal? (on oSSI 1.2 on FC2)
>
> i have loadlevelled a process with the
> loadlevel  -p <pid>   command
>
> to my opinion, i am astonished to see that this process is migrating too
> frequently
> i am afraid that this process spends too much computing time in
> migrating from node to nodes..
>
> according to you is that a normal situation?
>
> example here below :
> the process 181870(symphonie) leaves node 2 at
> 1145007809 and come back on the same node immediately 54seconds later at
> 1145007863, then restart at 1145007872 and come back at 1145007918
>
> do i miss something or something goes wrong?  thanks for your advice
>
> [root@comclust2 root]# cat /proc/cluster/loadlog | grep 181870
> 1145007809 loadbl:pid 181870(symphonie) -> node 1 mem 49780 my load 30
> node1 load 25
> 1145007863 loadlb:pid 181870(symphonie) <- node 1 mem 115296 my load 15
> node1 load 52
> 1145007872 loadbl:pid 181870(symphonie) -> node 1 mem 98228 my load 31
> node1 load 27
> 1145007918 loadlb:pid 181870(symphonie) <- node 1 mem 84680 my load 16
> node1 load 30
> 1145007920 loadbl:pid 181870(symphonie) -> node 1 mem 84248 my load 31
> node1 load 22
> 1145007935 loadlb:pid 181870(symphonie) <- node 1 mem 80048 my load 16
> node1 load 39
> 1145007938 loadbl:pid 181870(symphonie) -> node 1 mem 79448 my load 31
> node1 load 23
> 1145008011 loadlb:pid 181870(symphonie) <- node 1 mem 57536 my load 15
> node1 load 35
> 1145008060 loadbl:pid 181870(symphonie) -> node 1 mem 50284 my load 30
> node1 load 25
> 1145008110 loadlb:pid 181870(symphonie) <- node 1 mem 49488 my load 15
> node1 load 55
> 1145008153 loadbl:pid 181870(symphonie) -> node 1 mem 49688 my load 31
> node1 load 24
> 1145008177 loadlb:pid 181870(symphonie) <- node 1 mem 123756 my load 15
> node1 load 83
> 1145008188 loadbl:pid 181870(symphonie) -> node 1 mem 117192 my load 30
> node1 load 27
> 1145008219 loadlb:pid 181870(symphonie) <- node 1 mem 71652 my load 15
> node1 load 34
> 1145008221 loadbl:pid 181870(symphonie) -> node 1 mem 71256 my load 32
> node1 load 24
> 1145008323 loadlb:pid 181870(symphonie) <- node 1 mem 153988 my load 14
> node1 load 70
> 1145008339 loadbl:pid 181870(symphonie) -> node 1 mem 56220 my load 23
> node1 load 25
> 1145008374 loadlb:pid 181870(symphonie) <- node 1 mem 56296 my load 14
> node1 load 69
> 1145008416 loadbl:pid 181870(symphonie) -> node 1 mem 55296 my load 23
> node1 load 24
> 1145008445 loadlb:pid 181870(symphonie) <- node 1 mem 55636 my load 14
> node1 load 37
> 1145008652 loadbl:pid 181870(symphonie) -> node 1 mem 50864 my load 23
> node1 load 25
> 1145008689 loadlb:pid 181870(symphonie) <- node 1 mem 52524 my load 14
> node1 load 81
> 1145008844 loadbl:pid 181870(symphonie) -> node 1 mem 49280 my load 23
> node1 load 24
> 1145008864 loadlb:pid 181870(symphonie) <- node 1 mem 50552 my load 14
> node1 load 46
> 1145015003 loadbl:pid 181870(symphonie) -> node 3 mem 50064 my load 43
> node3 load 30
> 1145015189 loadlb:pid 181870(symphonie) <- node 3 mem 238076 my load 15
> node3 load 41
> 1145015330 loadbl:pid 181870(symphonie) -> node 3 mem 49732 my load 41
> node3 load 30
> 1145016442 loadlb:pid 181870(symphonie) <- node 3 mem 48652 my load 35
> node3 load 28
> 1145016515 loadbl:pid 181870(symphonie) -> node 3 mem 47164 my load 53
> node3 load 35
> 1145017288 loadlb:pid 181870(symphonie) <- node 3 mem 47132 my load 38
> node3 load 28
> 1145017301 loadbl:pid 181870(symphonie) -> node 3 mem 47536 my load 61
> node3 load 35
> 1145017435 loadlb:pid 181870(symphonie) <- node 3 mem 58580 my load 16
> node3 load 39
> 1145017491 loadbl:pid 181870(symphonie) -> node 3 mem 47760 my load 50
> node3 load 32
> 1145017711 loadlb:pid 181870(symphonie) <- node 3 mem 47148 my load 41
> node3 load 31
> 1145017714 loadbl:pid 181870(symphonie) -> node 3 mem 48420 my load 51
> node3 load 38
> 1145018049 loadlb:pid 181870(symphonie) <- node 3 mem 47100 my load 37
> node3 load 28
> 1145018051 loadbl:pid 181870(symphonie) -> node 3 mem 48484 my load 45
> node3 load 37
> 1145018331 loadlb:pid 181870(symphonie) <- node 3 mem 46836 my load 32
> node3 load 28
> 1145018370 loadbl:pid 181870(symphonie) -> node 3 mem 48336 my load 69
> node3 load 35
> 1145018945 loadlb:pid 181870(symphonie) <- node 3 mem 70116 my load 18
> node3 load 71
> 1145019030 loadbl:pid 181870(symphonie) -> node 3 mem 48880 my load 43
> node3 load 37
> 1145019126 loadlb:pid 181870(symphonie) <- node 3 mem 48940 my load 21
> node3 load 41
> 1145019176 loadbl:pid 181870(symphonie) -> node 3 mem 49200 my load 46
> node3 load 35
> 1145019455 loadlb:pid 181870(symphonie) <- node 3 mem 362708 my load 14
> node3 load 42
> 1145019572 loadbl:pid 181870(symphonie) -> node 3 mem 172132 my load 36
> node3 load 30
> 1145019738 loadlb:pid 181870(symphonie) <- node 3 mem 351956 my load 15
> node3 load 39
> 1145019868 loadbl:pid 181870(symphonie) -> node 3 mem 187400 my load 40
> node3 load 30
> 1145020041 loadlb:pid 181870(symphonie) <- node 3 mem 304048 my load 16
> node3 load 58
> 1145020173 loadbl:pid 181870(symphonie) -> node 3 mem 108976 my load 36
> node3 load 30
> 1145020344 loadlb:pid 181870(symphonie) <- node 3 mem 337896 my load 17
> node3 load 62
> 1145020475 loadbl:pid 181870(symphonie) -> node 3 mem 159416 my load 41
> node3 load 30
> 1145020639 loadlb:pid 181870(symphonie) <- node 3 mem 286468 my load 14
> node3 load 73
> 1145020653 loadbl:pid 181870(symphonie) -> node 3 mem 143900 my load 48
> node3 load 35
> 1145020813 loadlb:pid 181870(symphonie) <- node 3 mem 242244 my load 14
> node3 load 71
> 1145020947 loadbl:pid 181870(symphonie) -> node 3 mem 49452 my load 37
> node3 load 30
> 1145021116 loadlb:pid 181870(symphonie) <- node 3 mem 228888 my load 16
> node3 load 52
> 1145021264 loadbl:pid 181870(symphonie) -> node 3 mem 48624 my load 57
> node3 load 35
> 1145021378 loadlb:pid 181870(symphonie) <- node 3 mem 230680 my load 14
> node3 load 53
>
>
>
> --
>       Maurice Libes
> Tel : +33 (04) 91 82 93 25            Centre d'Oceanologie de Marseille
> Fax : +33 (04) 91 82 65 48            UMS2196 CNRS- Campus de Luminy,
> Case 901
> mailto:[email protected]  F-13288 Marseille cedex 9
> Annuaire : http://annuaire.univmed.fr/showuser.php?uid=libes
>
>
>


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