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Re: [RFC] Patch: RAM-based heuristics for ggc-min-heapsize and ggc-min-expand
- From: Richard Earnshaw <rearnsha at arm dot com>
- To: "Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>
- Cc: gcc-patches at gcc dot gnu dot org, Richard dot Earnshaw at arm dot com
- Date: Thu, 13 Feb 2003 11:39:15 +0000
- Subject: Re: [RFC] Patch: RAM-based heuristics for ggc-min-heapsize and ggc-min-expand
- Organization: ARM Ltd.
- Reply-to: Richard dot Earnshaw at arm dot com
> The recent discussion about ggc-min-heapsize and ggc-min-expand here:
> inspired me to write something to dynamically choose default values
> depending on the total physical memory size.
> I think this approach is better than simply raising the value, since
> it avoids hosing smaller boxes. It's also better IMHO than an
> adaptive algorithm based on available RAM or page faults in that this
> way it is deterministic. (At least it is for a given amount of RAM.)
> 2003-02-12 Kaveh R. Ghazi <email@example.com>
> * Makefile.in (ggc-common.o): Depend on $(PARAMS_H)
> * ggc-common.c: Include params.h
> (ggc_min_expand_heuristic, ggc_min_heapsize_heuristic,
> init_ggc_heuristics): New functions.
> * ggc.h (ggc_min_expand_heuristic, ggc_min_heapsize_heuristic,
> init_ggc_heuristics): Prototype.
> * toplev.c (parse_options_and_default_flags): Call
> * libiberty.h (physmem_total, physmem_available): Prototype.
> * Makefile.in (CFILES): Add physmem.c.
> (REQUIRED_OFILES): Add physmem.o.
> * configure.in: Check for sys/pstat.h.
> (checkfuncs): Add pstat_getstatic and pstat_getdynamic.
> * physmem.c: New file, copied from textutils.
> * config.in, configure: Regenerated.
Wouldn't it make sense for the "gcc" driver program to determine these
values and pass them in as parameters to cc1? Then compilations would be
repeatable across multiple machines since -v would show us what values
were in use.