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From "Rustem Rafikov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3231) [threading] There is a performance improvement if using "initial-exec" tls model on em64t linux.
Date Tue, 27 Feb 2007 17:59:05 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12476247
] 

Rustem Rafikov commented on HARMONY-3231:
-----------------------------------------

There is no need to compile the launcher with "initial-exec" as it does not  use "thread local"
vars itself. Moreover all thread local accesses are in the only module (hythr) for now. So,
IMHO, we can switch to "initial-exec" w/o expecting drawbacks.


> [threading] There is a performance improvement if using "initial-exec" tls model on em64t
linux.
> ------------------------------------------------------------------------------------------------
>
>                 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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