Red Hat Directory Server 7.1 for HP-UX11i v2 Integrity System Performance Tuning and Sizing Guideline

Red Hat Directory Server 7.1 Performance Tuning and Sizing Guidelines
Performance with different # of CPUs
0
2000
4000
6000
8000
10000
12000
14000
2468
number of cpus
operations / sec
6 threads
8 threads
Figure 1: Performance difference based on different number of CPUs. Measured on Montecito-based test
configuration @1.6GHz /CPUs.
Memory
The Red Hat Directory Server for HP-UX caches entry and indexing information in memory. It requires at least 256
MB of memory for a small deployment, but for large deployments, 512MB to 4GB or more RAM is needed for best
performance. To estimate how much RAM is needed for Directory Server on a HP-UX Integrity system, please use
the following formula:
Total_RHDS_RAM = 1.2 * (base_RAM_need_for_slapd_process + caches)
Where
base_RAM_needed_for_slapd_process = 27 MB + nsslapd-threadnumber * 0.25MB
caches = dbcache + SUM(all entry caches)* 2.3 + 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.
• 27MB: is the size of the slapd process.
• nsslapd-threadnumber *0.25 MB: each thread needs about 0.25 MB of memory.
• dbcache: specified as nsslapd-dbcachesize.
• All entry caches: specified as nsslapd-cachememsize. The 2.3 factor only needs to apply to the
nsslapd-cachememsize of the databases you are doing the work with.
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