Add faster implementation of _IonNature.ion_hash #22
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tgregg
approved these changes
Sep 2, 2021
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| return _bytes.replace(bytes([_ESCAPE_BYTE]), bytes([_ESCAPE_BYTE, _ESCAPE_BYTE])) \ | ||
| .replace(_BEGIN_MARKER, bytes([_ESCAPE_BYTE, _BEGIN_MARKER_BYTE])) \ | ||
| .replace(_END_MARKER, bytes([_ESCAPE_BYTE, _END_MARKER_BYTE])) |
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Should we avoid recomputing bytes([...]) on each call by storing the values?
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I don't know. I have also heard that looking up non-local values can be expensive in Python, and if we want to compute once and store the value, then it would need to be a non-local value. I'll create a followup issue to see if it would improve performance.
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That's fine with me, although it does seem like a simple enough thing to try given that you already have a basic perf testing setup.
cheqianh
approved these changes
Sep 2, 2021
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Issue #, if available:
Not necessarily a fix; at least an improvement for #21
Description of changes:
New implementation of
.ion_hash()that does away with the overhead of instantiatingion_writers. As part of this change, I improved the performance of the_escape()function, which has the side effect of also benefitting theion_hash_readerand theion_hash_writer.I did some very informal performance testing using this script.
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