Multi-Theading writes to the same 389 Master Server

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We have a customer that has been multi-threading behind multiple servers and writing to our Master server.   These writes come in the form of heavy spikes (1k over 5 second intervals) very much burst traffic and all the writes are adding new items to the same ou.  While we have plans to throttle them I had a few questions:

a) If they're writing to the same ou / updating the same indexes are they blocked on one items success before another succeeds?  So in this case multi threading behind multiple boxes does not give them any performance impact.  I would guess this is the case, but I want to be sure.  Because replication seems to be fine which goes through a single thread iirc.

b) are there any performance tweaks that can help?  I thought maybe looking at nsslapd-threadnumber.

-Jeff
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