Python脚本由于CPU利用率达到99%而随机失败，内核杀死了我的脚本

我有一个python脚本，它在达到99%的CPU利用率后被内核杀死。python正在对postgresql数据库执行SQL查询，并将结果附加到单个JSON文件中。当我到达查询150，CPU利用率达到99%以上，然后内核终止脚本时，就会出现问题。如何改进我的代码以避免这种情况发生？我将非常感谢你的帮助

代码

from __future__ import print_function

try:
    import psycopg2
except ImportError:
    raise ImportError('\n\033[33mpsycopg2 library missing. pip install psycopg2\033[1;m\n')
    sys.exit(1)


import re
import sys
import json
import pprint
import time

outfilepath = "crtsh_output/crtsh_flat_file"

outfilepath = "crtsh2" + ".json"

DB_HOST = 'crt.sh'
DB_NAME = 'certwatch'
DB_USER = 'guest'

# DELAY = 0


def connect_to_db():
    start = 0
    offset = 10
    flag = True
    while flag:
        filepath = 'forager.txt'
        with open(filepath) as fp, open(outfilepath) as outfile:
            unique_domains = ''
            try:
                conn = psycopg2.connect("dbname={0} user={1} host={2}".format(DB_NAME, DB_USER, DB_HOST))
                cursor = conn.cursor()
                cursor.itersize = 10000
                for cnt, domain_name in enumerate(fp):
                    print("Line {}: {}".format(cnt, domain_name))
                    print(domain_name)
                    domain_name = domain_name.rstrip()

                    cursor.execute('''SELECT c.id, x509_commonName(c.certificate), x509_issuerName(c.certificate), x509_notBefore(c.certificate), x509_notAfter(c.certificate), x509_issuerName(c.certificate), x509_keyAlgorithm(c.certificate), x509_keySize(c.certificate), x509_publicKeyMD5(c.certificate), x509_publicKey(c.certificate), x509_rsaModulus(c.certificate), x509_serialNumber(c.certificate), x509_signatureHashAlgorithm(c.certificate), x509_signatureKeyAlgorithm(c.certificate), x509_subjectName(c.certificate), x509_name(c.certificate), x509_name_print(c.certificate), x509_commonName(c.certificate), x509_subjectKeyIdentifier(c.certificate), x509_extKeyUsages(c.certificate), x509_certPolicies(c.certificate), x509_canIssueCerts(c.certificate), x509_getPathLenConstraint(c.certificate), x509_altNames(c.certificate), x509_altNames_raw(c.certificate), x509_cRLDistributionPoints(c.certificate), x509_authorityInfoAccess(c.certificate), x509_print(c.certificate), x509_anyNamesWithNULs(c.certificate), x509_extensions(c.certificate), x509_tbscert_strip_ct_ext(c.certificate), x509_hasROCAFingerprint(c.certificate)
                    FROM certificate c, certificate_identity ci WHERE
                    c.id= ci.certificate_id AND ci.name_type = 'dNSName' AND lower(ci.name_value) =
                    lower(%s) AND x509_notAfter(c.certificate) > statement_timestamp()''', (domain_name,))


                # query db with start and offset
                    unique_domains = cursor.fetchall()
                    if not unique_domains:
                        flag = False
                    else:
                        # do processing with your data

                        pprint.pprint(unique_domains)


                        outfile.write(json.dumps(unique_domains, sort_keys=True, indent=4, default=str, ensure_ascii = False))
                        offset += limit


            except Exception as error:
                print(str(error))

if __name__ == "__main__":
    connect_to_db()

---

内核日志中的消息是什么？在查询150时，利用率总是达到99%吗？您是否尝试过限制该数字周围的查询数量，以查看是否有新的/有趣的事情发生？@Gigaflop如果我将结果数量限制为1000，则利用率不会达到99%。但是，我想返回所有结果，因此不能限制结果。@LaurenzAlbe感谢您的帮助。我在内核日志中找不到错误消息。我正在登录/etc/rsyslog.d/50-default.conf？是这个吗？如果没有，我应该去哪里找？@bedford取决于您的Linux发行版。询问系统管理员。如果没有日志条目，您如何知道内核杀死了后端？