Re: [Exist-open] time a query to milliseconds

[Dannes W. <da...@ex...>]

Hi,

On 8 Sep 2014, at 20:47 , Chris Tomlinson <chr...@gm...> wrote:

> Is there a way to time a query or function execution to milliseconds (or finer)?
> 
> I try something like:
> 
>> let $start := current-time()
>> let $hits := run-query
>> let $stop := current-time()
> 
> but returning $stop - $start returns PT0S
> 
> eXide flashes up the execution time of a "Run" in milliseconds courtesy of jquery I think.

The xpath function has to return the same value for the whole duration of the xquery ; see the spec http://www.w3.org/TR/xpath-functions/#func-current-time  ;

instead use the functions from util:

util:system-date

util:system-date() as xs:date
Returns the current xs:date (with timezone) as reported by the Java method System.currentTimeMillis(). Contrary to fn:current-date, this function is not stable, i.e. the returned xs:date will change during the evaluation time of a query and can be used to measure time differences.

Returns:
xs:date : the current xs:date (with timezone)
util:system-dateTime

util:system-dateTime() as xs:dateTime
Returns the current xs:dateTime (with timezone) as reported by the Java method System.currentTimeMillis(). Contrary to fn:current-dateTime, this function is not stable, i.e. the returned xs:dateTime will change during the evaluation time of a query and can be used to measure time differences.

Returns:
xs:dateTime : the current xs:dateTime (with timezone)

regards

Dannes