[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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