[tor-dev] building from source in a 64-bit windows environment..

Zack Weinberg zackw at panix.com
Sat May 18 03:56:44 UTC 2013

On 2013-05-17 11:04 PM, Blibbet wrote:

> On the positive side, it seems like many Win32 projects get about 15%
> faster (when run on NT64 systems, removing the overhead of the Win32
> subsystem)

Just one point of information: this is almost certainly due to the 
larger register set and newer, more efficient calling conventions used 
on x86-64.  I would expect OS overhead (whether or not from a 
"subsystem", which AIUI is a vestigial concept in modern Windows anyway) 
to be more or less the same in both modes.

If I am mistaken about this -- if Windows actually does offer 
substantially reduced OS overhead for 64-bit processes -- then, with my 
Firefox hat on rather than my Tor hat, I would really appreciate 
pointers to details.


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