Solaris Clock Thread Performance On Systems with >= 256 VCPUs May Degrade Resulting In High %SYS Or System Hangs
(Doc ID 1377071.1)
Last updated on MARCH 14, 2021
Applies to:Solaris Operating System - Version 10 3/05 to 10 8/11 U10 [Release 10.0]
Solaris x64/x86 Operating System - Version 10 3/05 and later
Information in this document applies to any platform.
Systems with more than 256 Virtual CPUs (VCPUs) running Solaris 10 or Solaris 11 Express may hang or encounter performance issues due to the scalability and performance of the clock thread.
If this issue is encountered, one or more of the symptoms listed below may be observed:
- General performance of the entire system will be slow when running user commands, applications, etc.
- vmstat will show a consistently high, and potentially increasing, value for kthr:r (number of runnable threads)
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