使用postgresql（psycopg2）在python中的内存不断增加

Question

from bottle import route, request, run, response, hook, HTTPResponse
from memory_profiler import profile
import psycopg2
from psycopg2.pool import ThreadedConnectionPool,AbstractConnectionPool
from contextlib import contextmanager

dbConnection = "dbname='test-db' user='dbuser' host='localhost' password='dbpass'"
connectionpool = ThreadedConnectionPool(1,1,dsn=dbConnection)

@contextmanager
def getcursor():
    con = connectionpool.getconn()
    try:
        yield con.cursor()
    finally:
        connectionpool.putconn(con)

count=0
@profile
def process(fileOriginalName):
    try:
        print("process")
        fileObj = None
        with getcursor() as cur:
            cur.execute('SELECT document_object FROM public."Files" WHERE file_original_name=%s', (fileOriginalName,))
            fileObj = cur.fetchone()
    finally:
        return fileObj
#----------------------------------------------------------------------------
@route("/test/", method="GET")
@profile
def root():
    global count
    try:
        data = None
        if count == 0:
            data = process("file1")
            count=1
            return data
        else:
            data = process("file2")
            count=0
            return data
    finally:
        return "<h4>Testing file  : " + str(count)
run( server='paste', host='0.0.0.0', port=9000, reloader=True)

我正在尝试从Postgres DB中获取一个二进制对象。加载python代码后，它会占用更多内存，而不会将其释放回OS。请检查代码并帮助我修复它