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Speed up BlendFileBlock instantiation with __slots__

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Due to the huge number of BlendFileBlock objects created for packing a
production-size blend file, using slots here actually makes the
dependency tracer significantly (p<0.001) faster. In my test case the
speed improvement was 16% for a 'bam list' command.
This commit is contained in:
Sybren A. Stüvel 2018-03-08 13:59:28 +01:00
parent 88f23a4097
commit f2f824ad85
1 changed files with 10 additions and 1 deletions
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11
blender_asset_tracer/blendfile/__init__.py
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@ -38,7 +38,6 @@ from blender_asset_tracer import bpathlib
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
FILE_BUFFER_SIZE = 1024 * 1024 FILE_BUFFER_SIZE = 1024 * 1024
BLENDFILE_MAGIC = b'BLENDER' BLENDFILE_MAGIC = b'BLENDER'
GZIP_MAGIC = b'\x1f\x8b' GZIP_MAGIC = b'\x1f\x8b'
@ -378,6 +377,16 @@ class BlendFileBlock:
""" """
Instance of a struct. Instance of a struct.
""" """
# Due to the huge number of BlendFileBlock objects created for packing a
# production-size blend file, using slots here actually makes the
# dependency tracer significantly (p<0.001) faster. In my test case the
# speed improvement was 16% for a 'bam list' command.
__slots__ = (
'bfile', 'code', 'size', 'addr_old', 'sdna_index',
'count', 'file_offset', 'endian', '_id_name',
)
log = log.getChild('BlendFileBlock') log = log.getChild('BlendFileBlock')
old_structure = struct.Struct(b'4sI') old_structure = struct.Struct(b'4sI')
"""old blend files ENDB block structure""" """old blend files ENDB block structure"""