[Date Prev][Date Next] [Chronological] [Thread] [Top]

Progressive service degradation

Hello,

I've been running some saturation tests against OpenLDAP 
and have not yet been satisfied that I have things 
configured correctly.  The level of service is 
acceptable for the first two hours, but during the third 
hour, performance drops.  It continues to plummet over 
the course of the next 9 hours (it was an 12-hour 
test).  Here are the specific technical details:

  Server
  Red Hat 7.1
  OpenLDAP 2.0.11 - compiled from source
  Berkeley db 3.1.17 - from Red Hat RPM
  Pentium III 733
  256mb RAM
  10mb Ethernet

  Client
  NT 4.0
  DirectoryMark 1.2
  Pentium II 450
  128mb RAM
  10mb Ethernet

Here's the performance stats:
Hour  Avg Time  Transactions  Fails  Timeouts  ops/sec
        (ms)
0100    289       123,961      37        4     34.4
0200    309       115,924      34        3     32.2
0300    486        73,837      18        2     20.5
0400    749        47,987      13        1     13.3
0500    957        37,595      20       13     10.4
0600  1,158        31,067      52       41      8.6
0700  1,325        27,173     106       93      7.5
0800  1,490        24,169     115      106      6.7
0900  1,613        22,315     149      137      6.2
1000  1,745        20,642     181      168      5.7
1100  1,865        19,305     217      181      5.4
1200  1,974        18,233     237      211      5.1

Here are the relevant configuration settings from 
slapd.conf:

LDAP_Version_3
loglevel 0
idletimeout 30
sizelimit 500
timeout 3600
defaultsearchbase "dc=company,dc=com"

index  objectClass   eq,pres
index  cn            eq,sub
index  sn            eq
index  description   eq
index  seeAlso       eq

dbnolocking
dbnosync
cachesize 1500
dbcachesize 15000000

DirectoryMark is configured to use the search base 
of "dc=company,dc=com".  All searches are using an 
anonymous bind.  There is no delay between searches.  
Each DirectoryMark test executes for 60 minutes, and 
then writes out it's results.

I would like to know what additional configuration can 
be performed in order to maintain an acceptable level of 
performance over a longer period of time than two hours.

Thanks in advance,


Kayne McGladrey
k.mcgladrey@worldnet.att.net