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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 Wed, 28 Feb 2007 19:28:02 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12476684
] 

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

The launcher has dependancy on lybhythr.so in which all tls accesses are performed. So, "initial-exec"
will be working as libhythr is not loaded via dlopen.

But the launcher loads vm.so with dlopen. 
I see a potential problem if  HARMONY-3065 be applied. It spreads tls accesses among other
modules which are loaded with dlopen (fo example: vm.so). In this case "initial-exec" may
fail :(

So, we need to discuss both patches once again.



> [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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