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Joey Hess 2022-11-18 16:23:20 -04:00
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doc/bugs/performance_regression__63___init_takes_times_more/comment_15_145e29b42c46f15efc21c6d1ef9dd82d._comment
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@ -13,11 +13,8 @@ something else. Weird!
However, I also dumped the database to a sql script. Running that script
with sqlite3 takes only 2.39 seconds. So, persistent-sqlite does have some
performance overhead. My suspicion from profiling is that it's due to
conversion between data types. First it builts up a Text containing a SQL
statement (and not using a Builder). Then it uses encodeUtf8 on it to get
a ByteString, and then it uses useAsCString. So there are 2 or 3 copies
of the input data, which takes time and increases the allocations.
performance overhead. Opened an issue:
<https://github.com/yesodweb/persistent/issues/1441>
The test program: