JDK-6313320 : Performance regression of String.toUpperCase() and toLowerCase()
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.lang
  • Affected Version: 6
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris
  • CPU: x86
  • Submitted: 2005-08-19
  • Updated: 2013-11-01
  • Resolved: 2005-10-10
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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Other JDK 6
5.0u7Fixed 6 b56Fixed
Related Reports
Relates :  
JDK-4125644 - RFE: Improve locale handling in String.toLowerCase/toUpperCase
Relates :  
JDK-6265809 - Huge String.toLowerCase() performance regression
Description
Even after the fix for 6265809, String.toUpperCase() and toLowerCase() in Mustang workspace is slower than the same methods in 1.5.0_X and much slower than 1.4.2_X. This should be fixed.
Comments
EVALUATION Added a separate fast path for non-supplementary character case conversions. Here are the numbers which are in seconds to perform 1000000 case conversions, so lower is better. On Solaris 10 (Sunblade 2cpu): LC(NON-S) LC(SUPPL) UC(NON-S) UC(SUPPL) 1.4.2_08: 0.900 N/A 0.954 N/A 5.0u6: 1.513 2.667 1.427 2.601 Mustang w/fix: 0.445 0.856 0.500 1.028 On Windows XP (Pentium 4 2.5GHz, 1GB memory): LC(NON-S) LC(SUPPL) UC(NON-S) UC(SUPPL) 1.4.2_09: 0.401 N/A 0.440 N/A 5.0u4: 0.831 1.609 0.821 1.623 Mustang w/fix: 0.450 0.711 0.441 0.701 Test cases are attached to this bug.
22-09-2005