Punchline: at 5,000,000 (5M) entries, OpenLDAP 2.4.6+ delivered 20,179 authentications a second, ADAM delivered 5,424 and AD did 216. The 1,000,000 (1M) entry runs were 23,273 for OpenLDAP, 5,738 for ADAM, and 4,662 for AD.
The result are open, so feel free to independently verify (you will need an AMD Celestica A8440 with four Opteron 875s (dual 2.2GHz cores) and 16GB DDR333 RAM though ).
What about LDAP[?], the Internet directory standard, I asked.
“We looked at lots of technologies, but first we listened to our enterprise customers. They want to leverage technology in place, and Active Directory has a powerful policy engine. LDAP doesn’t have that. We don’t take a stand. We just go where the customers are.”
That, however, is the other side of the coin here. Microsoft is allowing integration with Active Directory, but over time it hopes LDAP will wither due to a shortage of competitive enterprise features.
So,
[Microsoft] hopes LDAP will wither due to a shortage of competitive enterprise features.
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