Ulrich Windl wrote:
>>>> Howard Chu <hyc(a)symas.com> schrieb am 07.02.2019 um 11:45 in Nachricht
>> A. Schulze wrote:
>>> Howard Chu:
>>>>> Any idea why the memory usage is so different?
>>>> If the only difference is that you set the open file limit to 1024, then it
>>>> like whatever your default file limit is is much larger.
>>> Hello Howard,
>>> yes, it's unlimited by default. Tons of other daemon also run without this
>> limits here.
>>> But in contrast: all other daemons don't let explode the memory usage.
>>> Maybe, it worth to find the difference?
>> That *is* the difference. slapd allocates an array of connection info, one
>> slot per
>> file descriptor. Running with "unlimited" files is clearly a bad idea here.
> OTOH slapd could also allocate the table in chunks of 100 or 1000 descriptors (if ever needed that much)
No. Such strategies invariably lead to failure under heavy load - precisely the time
when you want extra resources to be available for use. Preallocating means we always
have predictable and consistent runtime behavior.
>> In general, running with larger limits than you actually need is a bad idea.
> Yes, but allocating a huge table that is most likely never needed is also a bad idea IMHO.
It would not be a huge table if you set your resource limits appropriately.
>> is elementary system administration.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/