Comment #10 on issue 27911 by [email protected]: TCMalloc needs to be forked  
in order to compile correctly
http://code.google.com/p/chromium/issues/detail?id=27911

@antonm

To the extent to which we can maintain our choice of a multitude of  
allocators
without that much work, I think it is a big win.  It will allow us to vary
allocators, which in turn may expose different bugs, as different  
heap-monitoring
tools are employed.  Also, different allocation strategies result in vastly  
different
memory layout which in turn may instigate different bugs.  IMO, it is  
interesting
(for example) to do some stability tests with different allocators.

At different times historically, folks have asked what the impact of using  
the
Windows Low Fragmentation Heap, or JEMalloc. Having the switchable  
infrastrucuter
helped us answer this in the past, and will help us again answer this in  
the future
as newer and/or improved-versions of allocators appear on the scene.

Is there a large cost that I'm not seeing?

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