On 7/21/15 7:32 AM, Paweł Piotr Przeradowski wrote:
Hi,
First of all thanks for alembic which is great asset to have in your
development toolbelt.
I am experiencing large slowdowns when generating offline or doing
online migrations or even generating history. One of the CPU cores
stays at 100% for a large number of seconds.
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I have 141migrations
32branchpoints and40merges
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The hardware is:
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Intel®Core™i7-4510UCPU @2.00GHz×4
with8GB of RAM
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Each time I do a merge the time seems to grows. It looks to me that
alembic spends a lot of time calculating some dependency tree. Some
timings on commands *minutes:seconds*:
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alembic history 1:31.57total
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|
|
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alembic downgrade head:325b273d61bd--sql 1:24.10total // |This just
targets one migration|
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Is this a known problem? Any way I can speed it up?
not known at all, and it is likely a bug in the algorithm, but it's very
weird that it comes up with an answer, rather than just going into a
recursion overflow. it comes up with the right answer? can you supply
your full migration script structure in a .tar.gz archive ? Just the
scripts with the headers in them, I don't need the "upgrade()" or
"downgrade()" methods to be filled in. thanks.
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