loadmibs() makes query really slow

[teedu]

python3 -c "import pysnmp; print(pysnmp.__version__)"
4.4.12

script itself:

from pysnmp.hlapi import *

iterator = getCmd(
  SnmpEngine(),
  CommunityData('some_comm', mpModel=0),
  UdpTransportTarget(('host', 161)),
  ContextData(),
  ObjectType(ObjectIdentity('1.3.6.1.2.1.1.1.0')), 
  ObjectType(ObjectIdentity('.1.3.6.1.2.1.1.2.0').loadMibs('JUNIPER-CHASSIS-DEFINES-MIB','JUNIPER-SMI','CISCO-PRODUCTS-MIB'))
)
errorIndication, errorStatus, errorIndex, varBinds = next(iterator)

if errorIndication:
    print(errorIndication)

elif errorStatus:
    print('%s at %s' % (errorStatus.prettyPrint(),
                        errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))

else:
    for varBind in varBinds:
        print(' = '.join([x.prettyPrint() for x in varBind]))

And the outcome is ca 10 seconds. Without loadMibs everything works fine... Any suggetions?

[lextm]

In short, your specific test case does not require any of the Juniper or Cisco MIB documents to be loaded, since those OIDs are just the standard ones.

If you do need to load more MIB documents, loadMibs unfortunately has to run a complex algorithm to search/compile the modules, and that takes an undetermined period of time. 10-second shouldn't be surprising based on your machine/network setup.