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Re: Number of connections
On Mon, 15 Apr 2002, Adam Williams wrote:
> >Can anybody tell me how many simultaneous connections can be served
> >by the openldap server (2.0.23 with Red Hat Linux 7.1).
> >I have seen the code and it seems that there is a thread pool with 32
> >threads. Does it mean that server only can attend 32 connections at the
> >same time?
>
> Yes. But answering a request should be very quick, and the thread then
> processes the next request. I suppose you could try increasing the
> thread pool, but I don't know if that will work. In actuality (ever
> case I've seen) 32 is alot of concurrent queries.
>
Yes, increasing the thread pool does work fine.
You can set the number of threads and concurrent connections with:
threads <number of threads to run at max>
concurrency <number of concurrent connections to allow>
One other thing to note, slapd uses select, and is therefore limited to
1024 concurrent connections due to the limit of __FD_SETSIZE (I ran into
this in some scalability testing I was doing). If it were using poll then
the limit would be more scalable.
Of course, if you can run a read server with 1024 connections, I'm sure
you're doing fairly good...
We generally set concurrency slightly less then threads.
Regards
James Bourne
--
James Bourne, Supervisor Data Centre Operations
Mount Royal College, Calgary, AB, CA
www.mtroyal.ab.ca
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