URL:
<http://savannah.gnu.org/bugs/?37494>
Summary: Performance issue with NSNumber when used as key in
an NSDictionary
Project: GNUstep
Submitted by: wolfgang
Submitted on: mer. 03 oct. 2012 09:34:58 EDT
Category: None
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
When using NSNumber as key in a NSDictionary, the performance is acceptable
with low values. With very high unsigned long long values, the performance
drop seriously.
Here is the output of the enclosed test program.
2012-10-03 09:27:28.338 nsnumberaskey[23007] populating dict (low NSNumber)
2012-10-03 09:27:28.368 nsnumberaskey[23007] end population of dict
2012-10-03 09:27:28.369 nsnumberaskey[23007] fetching values
2012-10-03 09:27:28.386 nsnumberaskey[23007] fetched values
2012-10-03 09:27:28.414 nsnumberaskey[23007] populating dict (high NSNumber)
2012-10-03 09:27:31.490 nsnumberaskey[23007] end population of dict
2012-10-03 09:27:31.490 nsnumberaskey[23007] fetching values
2012-10-03 09:27:34.594 nsnumberaskey[23007] fetched values
2012-10-03 09:27:34.649 nsnumberaskey[23007] populating dict (NSString)
2012-10-03 09:27:34.711 nsnumberaskey[23007] end population of dict
2012-10-03 09:27:34.713 nsnumberaskey[23007] fetching values
2012-10-03 09:27:34.737 nsnumberaskey[23007] fetched values
The "low NSNumber" and NSString tests use keys with a value from 0 to 100000.
The high NSNumber case use keys from (1<<63 - 0) to (1 << 63 - 100000).
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: mer. 03 oct. 2012 09:34:58 EDT Name: nsnumberaskey.m Size: 4 ko By:
wolfgang
test program illustrating the bug
<http://savannah.gnu.org/bugs/download.php?file_id=26688>
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