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Re: [MANTA] Compiling ParticleCGT.cc on Intel Macs


Chronological Thread 
  • From: Carson Brownlee <brownlee@cs.utah.edu>
  • To: James Bigler <bigler@cs.utah.edu>
  • Cc: manta@sci.utah.edu
  • Subject: Re: [MANTA] Compiling ParticleCGT.cc on Intel Macs
  • Date: Thu, 26 Jul 2007 12:53:11 -0600
For now the templates can be reduced in TrvMajor since there is no implementation of the function for non common origin packets yet anyway if that might help. It seems to compile fine on my machine which is odd, and I still don't understand why it would be much worse than CGT.cc, as they are very similar files with the same templates. If what you say about GCC deciding to inline all the functions, if I broke it into two functions wouldn't it just be identical? Perhaps it would make it a little cleaner anyway though.
Carson


On Jul 26, 2007, at 7:53 AM, James Bigler wrote:

I've seen it on linux. That file consumes enormous amounts of memory and time to compile. This is usually due to templates inlining the world into a single function.

GCC seems to be able to handle large source file as long as individual functions don't get too large.

My guess is the use of the templated traverse and TrvMajor functions that are causing problems. TrvMajor is about 800 lines of code. It is included in traverse 8 times (6400 lines of code + plus other std template stuff).

I suspect if you broke traverse and or TrvMajor into smaller pieces the time and memory requirements to compile will go down.

I also seem to remember some time ago there was a GCC bug that caused exponential growth of memory based on the number of variables in a function, but I don't recall all the details.

James

Christiaan Paul Gribble wrote:
I've noticed the same thing on my Intel Mac, but I'm not sure why. I can't say that I've noticed it under Linux, but I haven't checked lately.
C
On Jul 26, 2007, at 1:13 AM, Austin Robison wrote:
So for some reason that I haven't been able to figure out in my cursory searches, compiling ParticleCGT.cc on an Intel mac (tested on both my laptop and Steve's machine) requires a huge (~2GB) amount of memory and takes much longer to compile than other .cc files, particularly on machines where this induces massive amounts of paging death... It seems to be just fine on the G5 I tested the compilation on, and I haven't heard of any problems from anyone else who I assume are using linux.

Any ideas?

~Austin




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