importin `ipdb` is much slower than importing `pdb`

I observe that importing ipdb takes much longer time than pdb almost 120 times on my end. During testing this will increase time to lose for each starting session.

What may be the reason for this (is it a normal case)? Is there any way to make it faster to import ipdb

• importing ipdb (ipdb==0.13.3)

0.60s user 0.09s system 90% cpu 0.754 total

• importing ipdb

0.05s user 0.01s system 97% cpu 0.062 total

[adamchainz]

This is fixed by #224 which instantiates IPython lazily.

I timed with hyperfine which does repeated runs and provides statistics.

On master:

$ hyperfine "python -c 'import ipdb'"
Benchmark #1: python -c 'import ipdb'
  Time (mean ± σ):     469.1 ms ±  63.6 ms    [User: 386.2 ms, System: 64.4 ms]
  Range (min … max):   436.5 ms … 647.6 ms    10 runs

With #224 applied:

$ hyperfine "python -c 'import ipdb'"
Benchmark #1: python -c 'import ipdb'
  Time (mean ± σ):     369.6 ms ±   7.5 ms    [User: 310.7 ms, System: 55.8 ms]
  Range (min … max):   360.3 ms … 383.6 ms    10 runs

For reference here’s the import time of just IPython:

$ hyperfine "python -c 'import IPython'"
Benchmark #1: python -c 'import IPython'
  Time (mean ± σ):     367.2 ms ±   5.9 ms    [User: 306.4 ms, System: 56.8 ms]
  Range (min … max):   360.5 ms … 381.2 ms    10 runs

[avatar-lavventura]

@gotcha Done. // @adamchainz Thanks for the fixed. I never heard hyperfine before, its a great tool