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Re: threads and concurrency
Omer Faruk SEN wrote:
I have and ldap server (openldap-2.4.23 ) in slapd.conf I set
but when I do top -b -H -d 2 -p 25560 I always see 8 threads ( show
9 slapd instances) not more even if I instruct to create 256 threads.
Is there anything that I miss?
Additionally what is the releation of threads and concurrency. Is
there any calculation method that I must obey?
concurrency generally does nothing on most platforms. I believe it might have
had an effect on old Solaris systems with their lwp library. You didn't
mention what OS you're using so it's impossible to tell you if this directive
has any relevance for you. Most likely not.
The threads setting tells the maximum number of threads slapd will spawn. It
creates them on demand, not all at once. If you want to see 256 threads then
you have to submit enough requests to make the server busy enough to actually
Keep in mind that each thread uses a thread stack of 4MB on 32 bit systems,
8MB on 64 bit systems. So you're looking at 1-2GB of RAM dedicated to the
threads with a setting like this. Make sure you don't configure more threads
than you have RAM for...
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/