Output:

perl generate_nsn_sgsn_report.pl 20141226
Memory Usage :  77.70%                      #at the starting stage the usage of RAM
120
120
120
120
120
120
120
120
120
120
Rac Val :120
120
120
120
Memory Usage :  77.70%  #Checking the ram usage after opening every file 
Memory Usage :  77.71%
Memory Usage :  77.71%
Memory Usage :  77.72%
Memory Usage :  77.75%

%val :120
%seen_cdr :212
%seen_var :4152
%pap_data :1858
%mcc_data :629
%mnc_data :1085
%sgsn_val :102895
%sgsn_name :102893
%pap_val :699127
%mcc_val :231276
%rac_val :4465260
%nsei_data :120
%nsvci_data :120
%nsvc_val :120
the code took:49 wallclock secs (48.76 usr  0.06 sys +  0.01 cusr  0.02 csys = 48.85 CPU)