[Fedora-directory-users] reducing memory footprint?

[George Holbert]

Ulf, thanks for the clarification.

Gerald, I should have mentioned, the HP tuning guide is not explicitly a 
guide for reducing memory usage.  But, some of the text (such as the 
excerpt I pasted) may be of use to you.

Good luck,
-- George

Ulf Weltman wrote:
> Hello George and Gerald.  I'm afraid the tuning guide wont help much 
> with reducing memory footprint, it focuses on increasing performance 
> which involves using more memory among other things! :)  There is a 
> document for the NSDS 7.0 which is not far from the FDS 1.0 codebase 
> if you're still interested, but the measurements and tuning 
> suggestions are meant for DS running on HP-UX.
>
> It does answer one of Gerald's questions:  worker threads can be 
> reduced with nsslapd-threadnumber, the default is 30.  I don't know 
> that this will save you significant memory on Linux.
>
> Ulf
>
> George Holbert wrote:
>
>> 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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>>>
>>>   
>>
>>
>>
>>
>>
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>
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