Status: New
Owner: ----
New issue 2474 by [email protected]: Investigate use of __thread for
faster TLS on glibc
http://code.google.com/p/v8/issues/detail?id=2474
There are several projects (for example Node) who are working to minimize
the impact of V8's Isolate TLS performance (which apparently shows up
enough in profiling for them to worry about it).
Mac and Windows already have a "fast tls" implementation in V8, although I
imagine this wasn't implemented for Linux because of glibc's additional TLS
complexity (generations and multi-block storage). From the little I know
about it, it seems like on those platforms (gcc + glibc) it could be much
better to use a __thread variable (at least when static linking, in the
case of Chrome and Node, for example). Ian Lance Taylor has a good
highlevel description of the situation here:
http://www.airs.com/blog/archives/44
What would be involved in moving from
GetThreadLocal(per_isolate_thread_data_key_) to a __thread variable on
platforms where that is available?
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