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Message-ID: <47580E5A.2040004@iki.fi>
Date: Thu, 06 Dec 2007 16:59:38 +0200
From: Andris Pavenis <andris DOT pavenis AT iki DOT fi>
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To: djgpp-workers AT delorie DOT com
Subject: Re: gcc-4.3. snapshots and DJGPP memory allocator efficiency
References: <47571B5D DOT 5090305 AT iki DOT fi>
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Andris Pavenis kirjoitti:
> There seem to be serious performance problems in GCC-4.3 for DJGPP due 
> to slowness of free() call especially for Ada compiler.
>
> Tried to bootstrap gcc-4.3-20071130 for DJGPP (after reverting some 
> earlier changes in libiberty/configure.ac present in snapshot). 
> Initially thought that compiler  (gnat1.exe) has went into some 
> infinite loop when compiling gcc/ada/ali.adb for stage2.
>
> Found that extremly long time is being spent in libibrty/hashtab.c in 
> procedure htab_delete() which in that case uses free() to release 
> several millions allocated memory block. htab_delete() took perhaps 
> about 30 minutes on Intel Core 2 Quad 2.4GHz processor (I did not 
> measure accuratelly). There is of course not much use of 4 processor 
> cores as DJGPP cannot use them all.
>
> Currently I see that perhaps the same thing happens (I haven't 
> verified with debugger) when compiling gcc/ada/g-catiio.adb (killed 
> after about 60 minutes, I don't know how much it will still would 
> require)
gcc/ada/catiio.ads is perhaps a different problem:

http://gcc.gnu.org/ml/gcc/2007-11/msg00791.html