Hi Gerald,
HP has a tuning guide for their bundled Netscape DS, which may be
somewhat useful to you for this:
http://docs.hp.com/en/7152/nds621_tuning_sizing_13.pdf
Of course, Fedora DS and HP's DS are not the same product, but they have
common heritage.
Excerpt:
The Netscape Directory Server for HP-UX caches entry and indexing
information in memory. HP-UX requires at
least 256 MB of memory for a small deployment. But for large directory
servers, 512MB to 4GB RAM is needed for
best performance. To estimate how much RAM needed for Directory Server
on a system, please use the following
formula:
Total_NDS_RAM = 1.2 * (base_RAM_need_for_slapd_process + caches)
Where
base_RAM_needed_for_slapd_process = 32MB + nsslapd-threadnumber * 1MB
caches = dbcache + SUM(all entry caches) + import_cache
Explanation:
· 1.2: 20% additional RAM needed for slapd process to handle incoming
LDAP operations. 20% is an
estimated number, and it should be sufficient. However, testing is
needed to ensure that it is enough before
going into production.
· 32MB: is the size of the slapd process.
· nsslapd-threadnumber *1MB: each thread needs about 1MB of memory.
· dbcache: specified as nsslapd-dbcachesize.
· All entry caches: specified as nsslapd-cachememsize.
Gerald Richter wrote:
Hi,
I just made a test installation of FDS and saw that a ns-slapd without any
user data takes about 120MB of (virtual) memory on my system.
I would like to run it on a system which limited memory resources, so I am
looking for a way to use less memory.
I don't have high load on that system and never more than one or two quries in
parallel, so it would be quite ok to reduce the number of threads and things
like this, but beside reducing the cache size of the backend DB I didn't find
any hints what can be done in this direction.
Any ideas?
Thanks
Gerald
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