Reduce number of sqlite transactions#41
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* calling `time run_test.sh -m` can be used to measure performance
Creating a new transaction for every sql operation causes performance issues. Instead, wait until multiple changes have been made before committing. Doing so speeds up the tracing of a sample program by a factor of 3-4. Still need to look into adding tests/docs, but want to get this commit out there first so that the general strategy being used here can be reviewed.
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Time to run Running with a buffer size of 50 wasn't appreciably different from 20. |
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It's much easier to view the diff by ignoring whitespace changes (adding Feel free to recommend style changes, no matter how minute. Some of the variable/function names could probably use improvement. |
| self.conn = self._open_db(name) | ||
| # Cursor used by _insert for all insert/update/delete segments. | ||
| self._cursor = self.conn.cursor() | ||
| # TODO force a flush on sys.atexit()? Is that too dirty? |
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Thoughts on this?
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fixes #34 |
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I still need to work on docs/tests, but wanted to get some initial feedback first.
All unit tests passed without any modification. Additionally, recording runs before/after the changes produced identical replays.