[Spread-users] high cpu load

[Dirk Vleugels]

Hi,

On Fri, Aug 31, 2001 at 01:11:30PM -0400, George Schlossnagle wrote:
> Yair,
> 
> I believe if he has his ring set up as he does, it will always fail to
> successfully muticast it's packet to it's neighbor and then have to unicast
> it.  This would completely explain his retransmisions being the same as his
> multicasts.

Yes, doing unicast over the first and multicast over the second
interface was the problem. Now both use the same interface, and the
retransmissions disappeared.

But, even through non-peak hours, the spread cpu-load (on the apache
servers) is still high. I assume select() is the culprit, nearly
all the load is system load:

  2:35pm  up 15 days, 17:57,  3 users,  load average: 0.44, 0.64, 0.61
224 processes: 222 sleeping, 1 running, 1 zombie, 0 stopped
CPU states: 11.1% user, 44.4% system,  0.0% nice, 44.4% idle
Mem:  1028856K av,  994240K used,   34616K free,       0K shrd,   15972K
buff
Swap: 1052248K av,  299812K used,  752436K free                  689604K
cached

  PID USER     PRI  SIZE  RSS WCHAN     STAT %CPU %MEM COMMAND
26823 spread    14  1352 1332 do_select S    25.9  0.1 spread

Would poll() do much better?

Cheers,
Dirk

[cluster-sip 3&4 not active right now]

Monitor> Monitor: send status query

============================
Status at loghost-sip V 3.16. 0 (state 1, gstate 1) after 620 seconds :
Membership  :  5  procs in 1 segments, leader is cluster1-sip
rounds   :  626035      tok_hurry :    1195     memb change:       5
sent pack:       6      recv pack :   22810     retrans    :       0
u retrans:       0      s retrans :       0     b retrans  :       0
My_aru   :   25040      Aru       :   25040     Highest seq:   25040
Sessions :       1      Groups    :       3     Window     :      60
Deliver M:   26506      Deliver Pk:   26549     Pers Window:      15
Delta Mes:    1576      Delta Pack:      83     Delta sec  :     218
==================================

Monitor>
============================
Status at cluster3-sip V 3.16. 0 (state 1, gstate 1) after 403 seconds :
Membership  :  5  procs in 1 segments, leader is cluster1-sip
rounds   :  547884      tok_hurry :     724     memb change:       1
sent pack:      36      recv pack :   21368     retrans    :       1
u retrans:       1      s retrans :       0     b retrans  :       0
My_aru   :   25040      Aru       :   25040     Highest seq:   25040
Sessions :     116      Groups    :       3     Window     :      60
Deliver M:   25012      Deliver Pk:   25040     Pers Window:      15
Delta Mes:   -1494      Delta Pack:       0     Delta sec  :    -217
==================================

Monitor>
============================
Status at cluster4-sip V 3.16. 0 (state 1, gstate 1) after 509 seconds :
Membership  :  5  procs in 1 segments, leader is cluster1-sip
rounds   :  625773      tok_hurry :    1139     memb change:       4
sent pack:     418      recv pack :   22396     retrans    :       0
u retrans:       0      s retrans :       0     b retrans  :       0
My_aru   :   25040      Aru       :   25040     Highest seq:   25040
Sessions :     129      Groups    :       3     Window     :      60
Deliver M:   26506      Deliver Pk:   26546     Pers Window:      15
Delta Mes:    1494      Delta Pack:       0     Delta sec  :     106
==================================

Monitor>
============================
Status at cluster2-sip V 3.16. 0 (state 1, gstate 1) after 423 seconds :
Membership  :  5  procs in 1 segments, leader is cluster1-sip
rounds   :  587570      tok_hurry :     859     memb change:       2
sent pack:   10519      recv pack :   11758     retrans    :       0
u retrans:       0      s retrans :       0     b retrans  :       0
My_aru   :   25040      Aru       :   25040     Highest seq:   25040
Sessions :     185      Groups    :       3     Window     :      60
Deliver M:   25945      Deliver Pk:   25977     Pers Window:      15
Delta Mes:    -561      Delta Pack:       0     Delta sec  :     -86
==================================

Monitor>
============================
Status at cluster1-sip V 3.16. 0 (state 1, gstate 1) after 443 seconds :
Membership  :  5  procs in 1 segments, leader is cluster1-sip
rounds   :  624402      tok_hurry :    1174     memb change:       3
sent pack:   11837      recv pack :   10963     retrans    :       0
u retrans:       0      s retrans :       0     b retrans  :       0
My_aru   :   25040      Aru       :   25040     Highest seq:   25040
Sessions :     186      Groups    :       3     Window     :      60
Deliver M:   26495      Deliver Pk:   26530     Pers Window:      15
Delta Mes:     550      Delta Pack:       0     Delta sec  :      20
==================================