[ 
> Improvment in the way DN are treated
> ------------------------------------
>
>          Key: DIR-182
>          URL: [url]http://issues.apache.org/jira/browse/DIR-182" target="_blank">http://issues.apache.org/jira/brows.../browse/DIR-182
>      Project: Directory
>         Type: Improvement
>     Reporter: Emmanuel Lecharny

>
> We have mesured that DN parsing is the hot spot in the server : we spend a
round 80 % of server time to parse DNs.
> After having studied the way BindRequest does handle DN, we can say that f
or a single bind for the user "uid=admin,ou=system", we have more than 40 pa
rsing done. Here is a list of all the parsing in the DnComparator.compare() 
method :
> (The '*' in front of each line shows where a parsing of both DN is done)
> * Compare 'ou=groups,ou=system' and 'uid=admin,ou=system'
> * Compare 'prefnodename=sysPrefRoot,ou=system' and 'uid=admin,ou=system'
> Compare 'uid=admin,ou=system' and 'uid=admin,ou=system'
> Compare 'uid=admin,ou=system' and 'uid=admin,ou=system'
> * Compare 'ou=groups,ou=system' and 'uid=admin,ou=system'
> * Compare 'prefnodename=sysPrefRoot,ou=system' and 'uid=admin,ou=system'
> Compare 'uid=admin,ou=system' and 'uid=admin,ou=system'
> Compare 'uid=admin,ou=system' and 'uid=admin,ou=system'
> * Compare 'ou=groups,ou=system' and 'ou=system'
> * Compare  'ou=interceptors,ou=configuration,ou=sys
tem' and 'ou=system'
> * Compare 'ou=configuration,ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> * Compare 'ou=groups,ou=system' and 'ou=system'
> * Compare  'ou=interceptors,ou=configuration,ou=sys
tem' and 'ou=system'
> * Compare 'ou=configuration,ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> * Compare 'ou=groups,ou=system' and 'ou=system'
> * Compare  'ou=interceptors,ou=configuration,ou=sys
tem' and 'ou=system'
> * Compare 'ou=configuration,ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> * Compare 'ou=groups,ou=system' and 'ou=system'
> * Compare  'ou=interceptors,ou=configuration,ou=sys
tem' and 'ou=system'
> * Compare 'ou=configuration,ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> * Compare 'ou=groups,ou=system' and 'ou=system'
> * Compare  'ou=interceptors,ou=configuration,ou=sys
tem' and 'ou=system'
> * Compare 'ou=configuration,ou=system' and 'ou=system'
> Compare 'ou=system' and 'ou=system'
> If we can change this compare function to work with Name instead of String
 we could have a huge improvment : more that 35x faster
> (I wrote a micro-bench to mesure the difference : around 36 times faster).
> As this is not the single place where we can gain time (we have a lot or String ->
 DN and DN -> String conversions during the Bind process), we would be able to handl
e Bind Request much much faster, too (being aware that we have a lot of other costly
 op
eraions that will nor allow a x40 improvment).
> My personnal guess is that we should be able to handle around 5000 binds per secon
d against the current 300, but this is just a guess 

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