A fix is available
APAR status
Closed as program error.
Error description
On ICO Central Server 2, vmstat reports show 100% CPU utilization over time. There are also CPU starvation related messages in BPM system out log: [1/10/16 6:05:42:732 UTC] 0000004b CoordinatorCo W HMGR0152W: CPU Starvation detected. Current thread scheduling delay is 20 seconds. TOP results showed approximately 100% system CPU. As this was consistently the case, the problem is related to how Linux OS is trying to resolve memory requests in certain circumstances. It is trying to reclaim local memory because in old chip architecture local memory was faster. Not the case any more and this code can get what is effectively an infinite loop. Two changes to fix this issue. One for a running system and the other to insure the fix is in place when the system is rebooted. 1) Run the following to change the running system: sysctlvm.zone_reclaim_mode=0 (Note: turning zone_reclaim_mode off) 2) Add the following at the end of /etc/sysctl.conf so the setting will be in place during the next reboot: vm.zone_reclaim_mode = 0 (Note: turning zone_reclaim_mode off) You may only seen this problem on CS2, but it would make sense to make this change on all servers.
Local fix
1) Run the following to change the running system: sysctlvm.zone_reclaim_mode=0 (Note: turning zone_reclaim_mode off) 2) Add the following at the end of /etc/sysctl.conf so the setting will be in place during the next reboot: vm.zone_reclaim_mode = 0 (Note: turning zone_reclaim_mode off)
Problem summary
On ICO Central Server 2, vmstat reports show 100% CPU utilization over time. There are also CPU starvation related messages in BPM system out log
Problem conclusion
Based on the platforms / virtualization experts the system setting recommended for vm.zone_reclaim_mode should be 0
Temporary fix
Comments
APAR Information
APAR number
ZZ00525
Reported component name
SMRTCLOUD ORCHS
Reported component ID
5725H2800
Reported release
240
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-01-28
Closed date
2016-02-12
Last modified date
2016-02-12
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
SMRTCLOUD ORCHS
Fixed component ID
5725H2800
Applicable component levels
R240 PSY
UP
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Document Information
Modified date:
03 November 2021