(ITS#6674) OpenLDAP 2.4.16 has very high CPU load on Solaris 10, x86

[donal.duane@ericsson.com]

Full_Name: Donal Duane
Version: 2.4.16
OS: Solaris 10
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (95.45.199.134)


Hi,

I would like to know if this is a known issue, and if so, if a fix has been
issued.

We have only recently started using OpenLDAP 2.4.16 on Solaris 10, x86 HW.
(Because of this, we have no previous benchmark for CPU usage for OpenDLAP for
comparison - we also have sparc systems, but have not stress tested OpenLDAP on
sparc yet).

We have noticed that the slapd process is using a huge amount of CPU.

There are massive CPU time spikes obvious over a period of time which we
monitored, reaching 520 CPU seconds and even 700 CPU seconds at one stage. there
are also some completely flat periods.

The activities seem to be purely LDAP searches.


Processor info:

# psrinfo -pv
The physical processor has 4 virtual processors (0 4 8 12)
  x86 (chipid 0x0 GenuineIntel family 6 model 29 step 1 clock 2400 MHz)
        Intel(r) Xeon(r) CPU           E7440  @ 2.40GHz
The physical processor has 4 virtual processors (1 5 9 13)
  x86 (chipid 0x1 GenuineIntel family 6 model 29 step 1 clock 2400 MHz)
        Intel(r) Xeon(r) CPU           E7440  @ 2.40GHz
The physical processor has 4 virtual processors (2 6 10 14)
  x86 (chipid 0x2 GenuineIntel family 6 model 29 step 1 clock 2400 MHz)
        Intel(r) Xeon(r) CPU           E7440  @ 2.40GHz
The physical processor has 4 virtual processors (3 7 11 15)
  x86 (chipid 0x3 GenuineIntel family 6 model 29 step 1 clock 2400 MHz)
        Intel(r) Xeon(r) CPU           E7440  @ 2.40GHz



# isainfo -b
64

=> (64 bit)

# uname -a
SunOS atrcxb1226 5.10 Generic_142901-13 i86pc i386 i86pc


Any help appreciated.

Regards,
Dónal