[Spread-users] high cpu load

Yair Amir yairamir at cnds.jhu.edu
Mon Aug 27 10:53:50 EDT 2001


Hi,

Something seems wrong with your network. I think Spread should use less than 10% cpu. 
You have way to many retransmissions. You have only about 30 packets/sec which is really
low. Usually in speeds below thousands of packets/sec, there should almost be no retransmissions.
I don't know why this happens on your network. 

	Cheers,

	:) Yair.

Dirk Vleugels wrote:
> 
> Hi,
> 
> we're using mod_log_spread to combine the access logs of a 4-node LVS
> cluster. The CPU usage of the spread daemons (on the apache
> real-servers) seems quite high (up to 60%), while the loghost is
> idle.
> 
> spmonitor shows the following numbers:
> 
> Status at cluster1 V 3.16. 0 (state 1, gstate 1) after 760918 seconds :
> Membership  :  5  procs in 1 segments, leader is cluster1
> rounds   : 617634183    tok_hurry : 2144198     memb change:       5
> sent pack: 5706975      recv pack : 17722855    retrans    : 5540933
> u retrans: 5386778      s retrans :  154155     b retrans  :       0
> My_aru   : 14529311     Aru       : 14529311    Highest seq: 14529311
> Sessions :     163      Groups    :       3     Window     :      60
> Deliver M: 24034352     Deliver Pk: 24133000    Pers Window:      15
> Delta Mes:  224840      Delta Pack:       0     Delta sec  :  129196
> ==================================
> 
> Monitor>
> ============================
> Status at cluster3 V 3.16. 0 (state 1, gstate 1) after 761407 seconds :
> Membership  :  5  procs in 1 segments, leader is cluster1
> rounds   : 617636072    tok_hurry : 2087959     memb change:       9
> sent pack: 5637323      recv pack : 23049662    retrans    : 5616992
> u retrans: 5557058      s retrans :   59934     b retrans  :       0
> My_aru   : 14529311     Aru       : 14529311    Highest seq: 14529311
> Sessions :     128      Groups    :       3     Window     :      60
> Deliver M: 24034364     Deliver Pk: 24133022    Pers Window:      15
> Delta Mes:      12      Delta Pack:       0     Delta sec  :     489
> ==================================
> 
> Monitor>
> ============================
> Status at cluster2 V 3.16. 0 (state 1, gstate 1) after 761172 seconds :
> Membership  :  5  procs in 1 segments, leader is cluster1
> rounds   : 617635235    tok_hurry : 2087845     memb change:       7
> sent pack: 5329799      recv pack : 23207452    retrans    :  603931
> u retrans:     416      s retrans :  603515     b retrans  :       0
> My_aru   : 14529311     Aru       : 14529311    Highest seq: 14529311
> Sessions :     148      Groups    :       3     Window     :      60
> Deliver M: 24034359     Deliver Pk: 24133012    Pers Window:      15
> Delta Mes:      -5      Delta Pack:       0     Delta sec  :    -235
> ==================================
> 
> Monitor>
> ============================
> Status at cluster4 V 3.16. 0 (state 1, gstate 1) after 761531 seconds :
> Membership  :  5  procs in 1 segments, leader is cluster1
> rounds   : 617637065    tok_hurry : 2088017     memb change:      11
> sent pack: 5715536      recv pack : 22496807    retrans    : 5397307
> u retrans: 5163263      s retrans :  234044     b retrans  :       0
> My_aru   : 14529311     Aru       : 14529311    Highest seq: 14529311
> Sessions :     148      Groups    :       3     Window     :      60
> Deliver M: 24034370     Deliver Pk: 24133048    Pers Window:      15
> Delta Mes:      11      Delta Pack:       0     Delta sec  :     359
> 
> Monitor>
> ============================
> Status at loghost V 3.16. 0 (state 1, gstate 1) after 631721 seconds :
> Membership  :  5  procs in 1 segments, leader is cluster1
> rounds   : 595498478    tok_hurry : 1867064     memb change:       3
> sent pack:       2      recv pack : 28541855    retrans    : 4951882
> u retrans: 4809775      s retrans :  142107     b retrans  :       0
> My_aru   : 14529246     Aru       : 14529246    Highest seq: 14529246
> Sessions :       1      Groups    :       3     Window     :      60
> Deliver M: 23809447     Deliver Pk: 23906883    Pers Window:      15
> Delta Mes: -224800      Delta Pack:      58     Delta sec  : -129808
> ==================================
> 
> Any hints to reduce the cpu load? Something misconfigured? What
> puzzles me are the membership changes. Afaik, only the first apache
> instance does the logging, so the start of more httpd's shouldn't
> affect this counter.
> 
> Regards,
> Dirk
> 
> --
> Dirk Vleugels                           E-Mail: dvl at 2scale.net
> 2scale GmbH                             Phone:  +49 231 28 661 52
> Am Rosenplätzchen 20                    Fax:    +49 231 28 661 59
> 44269 Dortmund, Germany                 Mobile: +49 173 28 106 61
> 
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