java - Track performance issue -


i made piece of code takes file, analyze (xml parser), create data in database (jpa/hibernate/postgres) , ftp transfers (apache commons-net). piece of code works :)

my workmate responible forf testing. tells me when tests on thousands of files (for migration purposes), piece of code fast @ beginning progressively slows down.

i added code track time piece of code takes each file. here result ~4500 files :

enter image description here

as can see, takes 250ms/file @ beginning takes 1 min each file. program uses 100% cpu have no memory problem (i have 16go ram)

there 1 hibernate transaction per file (so no transaction accumulation).

do know if there common bug can progressively slow down program or know way drill down?


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