[jira] Updated: (HARMONY-3231) [threading] There is a performance improvement if using "initial-exec" tls model on em64t linux.

["Rustem Rafikov (JIRA)" <ji...@apache.org>]

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

Rustem Rafikov updated HARMONY-3231:
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    Attachment: initial-exec-em64t.diff

> [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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