[gambit-list] Brad, just to get up to date about GCC memory consumption and other GCC bugs re Gambit

Bradley Lucier lucier at math.purdue.edu
Mon Feb 22 16:36:21 EST 2016


On 02/22/2016 04:31 PM, Adam wrote:
> 2016-02-23 4:23 GMT+07:00 Bradley Lucier <lucier at math.purdue.edu
> <mailto:lucier at math.purdue.edu>>:
>
>     On 02/20/2016 04:49 PM, Adam wrote:
>
>         Hi Brad,
>
>         About the GCC bug that sometimes GCC could take gigabytes of RAM
>         (20-75GB) for certain Gambit files,
>
>     ...
>
>         Are there any more gotchas to GCC use for various versions,
>         except for
>         that "-O2" produces broken code in some particular version?
>
>
>     Well, I don't know, I don't follow all gcc development, it seems
>     impossible to answer this question the way it's stated.
>
>     If you find a problem I'll look into it.
>
>     Brad
>
>
> Ok I'll narrow down my question:
>
>
> To make Gambit work well (with --enable-single-host) on 4.2.* and 4.3.*,
> is "-fno-move-loop-invariants" a complete solution?
>
> (The prob AFAIK was that it'd skyrocket to 20-75GB RAM consumption - and
> "-fno-move-loop-invariants" would bring it down to 1-2GB instead?)
>
>
Yes, I think so.

But why would one consider using 4.2.* and 4.3.* when much newer 
compilers are available.

Brad



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