php - w3wp.exe memory usage remains high after making web service calls -

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i have set 1 server php application , .asmx web service application.

my php application makes frequent calls web service functions inside .asmx file. in turn retrieve data database used in php application. here php code:

public function callservice($file, $web_service, $parameters){     if(defined("web_services_path")){         try{             $wsdl = web_services_path.$file."?wsdl";             $client = new soapclient ($wsdl, array('cache_wsdl' => wsdl_cache_none) );                             $result = $client->{$web_service}($parameters)->{$web_service."result"};             return $result;         }         catch(exception $e){           //handle error         }     } }

i noticed in instances web service calls cause w3wp process chew lot of memory. in instances, process start of @ around 80,000kb grow around 800,000kb

furthermore, process seems linger @ around 800,000kb unless kill or restart iis.

i have 2 questions this. firstly, why memory not released after web service calls? , secondly, factors cause w3wp process chewing memory?


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