I was performance test last week. 
I want to migrate from SunONE 5.2 to centos-ds or 389 ds.

but SunONE 5.2 performance is GoooooD!!~~~~~.

why?

OS: redhat linux 5.9 or centos linnux 5.9
HW : Specifications are the same.

target Directory Server: 
                                 SunONE 5.2 SP4 vs (centos-ds 8.1 or 389 ds 1.2.11)

tool : ldclt 4.3 : thread 1000, not each bind

rootdn: dc=example,dc=com 
sub suffix : ou=user in 100,000 user entry

first test.

search base : dc=example,dc=com
           filter : (&(objectclass=posixaccount)(cn=XXXXXX)) xxxxx Generated random.
           scope: sub

result :  SunONE 5.2 sp4
            access nentries=0 etime=0 ~ 2
            ldclt : 500 ~600 per thread


           centos-ds 8.1 or 389 ds
           access nentries=0 etime=0 ~ 7
           ldclt: 60 ~ 70 per thread

why? cause?