#24380: First locmem email sent in tests is absurdly slow.
-------------------------------------+-------------------------------------
Reporter: fletom | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Core (Mail) | Version: 1.7
Severity: Normal | Keywords: email fqdn performance
| tests
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 1 | UI/UX: 0
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Some of my application's tests send email. When running tests, Django sets
`EMAIL_BACKEND` to be `django.core.mail.backends.locmem.EmailBackend`.
This backend's `send_messages` calls `message.message()` on each email in
order to do header validation. However, this has the side effect of
generating a `Message-ID` email header, which calls `make_msgid()`, which
ends up calling `socket.getfqdn()`. On my machine, `socket.getfqdn()`
takes over 5 seconds to return. The `socket.getfqdn()` is cached,
fortunately, so the 5 second delay only happens once.
Five seconds may seem small but it is really significant when you're
rapidly alternating between writing code and running tests, and it's
totally unnecessary to set a `Message-ID` header on emails in
`django.core.mail.backends.locmem`. Right now my large test suite runs in
600 ms if I comment out that one pesky call that turns it into 5800 ms. So
while this isn't a bug, I think fixing it would be a really nice quality-
of-life change.
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Ticket URL: <https://code.djangoproject.com/ticket/24380>
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