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From "Rustem Rafikov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3231) [threading] There is a performance improvement if using "initial-exec" tls model on em64t linux.
Date Thu, 22 Feb 2007 12:05:05 GMT
[threading] There is a performance improvement if using "initial-exec" tls model on em64t linux.
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                 Key: HARMONY-3231
                 URL: https://issues.apache.org/jira/browse/HARMONY-3231
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
         Environment: linux-em64t
            Reporter: Rustem Rafikov
         Attachments: initial-exec-em64t.diff

Hi All, 

The attached patch changes tls model to initial-exec for linux-em64t (instead of general-dynamic
by default). This allows avoiding of __tls_addr_get calls to obtain the address of a thread-local
variable. Initial-exec can be used when all modules are loaded before a program starts working
but may not be loaded at runtime with dlopen(). 
The attached patch gives us up to 10% boost on specjbb2005 @ lnx64(and more on thread intensive
benchmarks).

--bwR



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