Hi,
We are having igawk statement calling gawk function and processing a master file, each gawk function have rules and action. We are using associative array to keep the output of each rule and finally printing the associative array. We are seeing the memory is growing incrementally in TOP command (size, res). We are deleting the associatve arrays after each pass.

igawk --re-interval -F -v OFS= -f symc.import.awk.Utils -f symc.import.cb.3eye.DSConstants -f symc.import.cb.3eye.DSUtilities -f AR_State_Master_DS1.gawk -f AR_State_Master_DS2.gawk -f Sub_Expr_Master_DS1.gawk -f corrections_Generator.gawk -f metricsGenerator.gawk -f update_Master.gawk "master.txt"

1. What are the tools I can use to find the memory leak
2. What could cause memory leak in gawk with associative array

How about putting system("echo label; ps -o pid,ppid,sz,pcpu,pmem,args >> tmpfile") at intervals throughout your script, alternating the label, to identify when the process size is increasing? It may be there's a value in an associative array you've forgotten to delete, or it might be you have a bug in your version of gawk (not unheard of - I've found some versions of gawk leak memory when you use index(), but worked fine if I replaced that with a regular expression).