Re: 5.3-Beta1: So far, so goo. Day 5.

On Thu, Aug 26, 2004 at 11:33:13PM +0300, Giorgos Keramidas wrote:
> On 2004-08-25 17:07, Gary Kline <kline_at_tao.thought.org> wrote:
> >
> > 	But Q1:  how exactly, does one get rid of the debugging stuff?
> 
> You can disable most of the debugging stuff with:
> 
> 	# /bin/rm -fr /etc/malloc.conf
> 	# ln -s ajr /etc/malloc.conf
> 
> and then commenting our or deleting the following options from your
> kernel config file:
> 
> %%%
> makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols
> options 	KDB			# Enable kernel debugger support.
> options 	DDB			# Support DDB.
> options 	GDB			# Support remote GDB.
> options 	INVARIANTS		# Enable calls of extra sanity checking
> options 	INVARIANT_SUPPORT	# Extra sanity checks of internal structures, required by INVARIANTS
> options 	WITNESS			# Enable checks to detect deadlocks and cycles
> options 	WITNESS_SKIPSPIN	# Don't run witness on spinlocks for speed
> %%%


	I'll hack KERNCONF; thanks for the howto's and wherefor's:)
	But not until there is a 5.3-STABLE!  ...Catchind deadlocks
	and not checking on spinlocks is likely wise, though.

> 
> Disabling all of these is certainly going to yield a faster system.
> 
> > 	And Q2, now that we've got gcc-3.4, would it help to use a higher
> > 	opyimization? say, "-O3"?   ....
> 
> I'm not sure if the speed gain is significant and worth the risk.
> I still use the same make.conf settings, shown below:
> 
> 	NO_CPU_CFLAGS=  true    # Don't add -march=<cpu> to CFLAGS automatically
> 	NO_CPU_COPTFLAGS=true   # Don't add -march=<cpu> to COPTFLAGS automatically
> 
> and I have commented out the CFLAGS and COPTFLAGS, the same way I did a
> year ago and two years ago, etc.
> 

	I'l cn run my own test suites to see; you're probably
	right abut the speed gain,  but it'll be a worthy test of
	gcc/g++.

	gary


-- 
   Gary Kline     kline_at_thought.org   www.thought.org     Public service Unix