[MacPorts] #29356: atlas @3.9.37 build failure - hangs with xztfc using 100% CPU

[MacPorts]

#29356: atlas @3.9.37 build failure - hangs with xztfc using 100% CPU
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  Reporter:  alan@…              |       Owner:  jameskyle@…           
      Type:  defect              |      Status:  closed                
  Priority:  Normal              |   Milestone:                        
 Component:  ports               |     Version:  1.9.2                 
Resolution:  invalid             |    Keywords:                        
      Port:  atlas               |  
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Changes (by vince@…):

  * status:  new => closed
  * resolution:  => invalid


Comment:

 ATLAS compiles pretty fast in 64-bit mode. It takes something like 15 min
 on my 3-year old MacBook Core2Duo. But, you're right, if you build the
 32-bit version (in your case, that would mean universal), it can be very
 slow. That's because, in 32-bit mode, Atlas explores a lot of different
 parameters for each routine it compiles (eg. use of X87 vs SSE/SSE2/SSE3,
 spacing of data to optimize cache fetch/prefetch, and so on).
 Unfortunately, since about every routine is already written in assembler,
 there is little gain to be expected from one processor to the other. That
 explains why it takes, in 32-bit mode, about the same time with a basic
 Core processor than with a new Sandy bridge CPU.

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Ticket URL: <https://trac.macports.org/ticket/29356#comment:6>
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