Qiskit/qiskit-ibmq-provider

`qiskit.IBMQ.load_account()` is very slow

singular-value opened this issue · 2 comments

singular-value commented

Information

  • Qiskit IBMQ Provider version: 0.17.4
  • Python version: 3.8
  • Operating system: macOS Big Sur

What is the current behavior?

qiskit.IBMQ.load_account() is very slow, taking 7-12 seconds typically.
First few lines of profiling output below:

         105441 function calls (105130 primitive calls) in 10.533 seconds

   Ordered by: internal time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
       94    9.968    0.106    9.968    0.106 {method 'read' of '_ssl._SSLSocket' objects}
        8    0.122    0.015    0.122    0.015 {method 'do_handshake' of '_ssl._SSLSocket' objects}
        8    0.110    0.014    0.110    0.014 {method 'load_verify_locations' of '_ssl._SSLContext' objects}
        8    0.088    0.011    0.088    0.011 {method 'connect' of '_socket.socket' objects}
        9    0.051    0.006    0.051    0.006 decoder.py:343(raw_decode)
        9    0.011    0.001    0.011    0.001 {built-in method _scproxy._get_proxy_settings}
        8    0.010    0.001    0.010    0.001 {built-in method _socket.getaddrinfo}
       23    0.009    0.000    0.034    0.001 backendconfiguration.py:856(_parse_channels)
        3    0.007    0.002    0.008    0.003 connectionpool.py:479(close)

Steps to reproduce the problem

Run qiskit.IBMQ.load_account() locally.

What is the expected behavior?

Although the function requires Network I/O, I can't see why it should take 10 seconds.

Suggested solutions

No suggestions unfortunately.

jyu00 commented

Reopen because #969 doesn't actually lazy load the providers:

IBMQ.load_account() calls _initialize_providers(), and each AccountProvider.__init__() creates an IBMQBackendService, which calls _discover_backends() that initializes all backends.