Steel Bank Common Lisp

Marc Halbruegge <marc.halbruegge@...> writes:
> Hi!
> 
> A few weeks ago, I complained about a slow down in SBCL's performance by
> about 15% between versions 1.0.4 and 1.0.5.
> 
> In the mean time, I had some hours left and could track down the problem
> to changes in the file src/compiler/x86/parms.lisp on April 30. These
> changes are all concerning memory layout.

That's strange. I wouldn't have expected that to have any measurable
performance effect. Just to verify, does just reverting the
src/compiler/x86/parms.lisp changes fix the problem, or do you need to
revert the whole patch? 

If your benchmark program can be distributed, I'd be interested in
having a look at it.

> My question: Is there a vital reason for these parameter changes, or is
> it ok to mix the current SBCL code with the older - in my case faster -
> parameter set?

Using the old parameters is ok. The new parameters are there mainly to
decrease the chances of address space randomization causing problems,
and to make it more feasible to run sbcl on systems where the maximum
amount of memory / address space that a program may use has been
limited.

-- 
Juho Snellman

Hi!

>> A few weeks ago, I complained about a slow down in SBCL's performance =
by
>> about 15% between versions 1.0.4 and 1.0.5.
>>
>> In the mean time, I had some hours left and could track down the probl=
em
>> to changes in the file src/compiler/x86/parms.lisp on April 30. These
>> changes are all concerning memory layout.
>=20
> That's strange. I wouldn't have expected that to have any measurable
> performance effect. Just to verify, does just reverting the
> src/compiler/x86/parms.lisp changes fix the problem, or do you need to
> revert the whole patch?=20
cvs update -D "2007-04-30 14:48" src/compiler/x86/parms.lisp
does the whole magic.

before (todays cvs-version) 53,6s
after (old parms.lisp)      46,4s

>=20
> If your benchmark program can be distributed, I'd be interested in
> having a look at it.
Sure. I'm doing cognitive modeling research using ACT-R
(http://act-r.psy.cmu.edu/)
In order to run it using sbcl, you have to apply some patches that you
can find here: http://www.unibw.de/lrt11/halbruegge/ACT-R

The actual benchmark task is a cognitive model written in ACT-R. I can
put that one online if you're interested.

>> My question: Is there a vital reason for these parameter changes, or i=
s
>> it ok to mix the current SBCL code with the older - in my case faster =
-
>> parameter set?
>=20
> Using the old parameters is ok. The new parameters are there mainly to
> decrease the chances of address space randomization causing problems,
> and to make it more feasible to run sbcl on systems where the maximum
> amount of memory / address space that a program may use has been
> limited.
ok.

Thanks for your quick answer!

Greetings
Marc

Marc Halbruegge <marc.halbruegge@...> writes:
> > If your benchmark program can be distributed, I'd be interested in
> > having a look at it.
> Sure. I'm doing cognitive modeling research using ACT-R
> (http://act-r.psy.cmu.edu/)
> In order to run it using sbcl, you have to apply some patches that you
> can find here: http://www.unibw.de/lrt11/halbruegge/ACT-R
> 
> The actual benchmark task is a cognitive model written in ACT-R. I can
> put that one online if you're interested.

That'd be great. Thanks.

-- 
Juho Snellman

>>> If your benchmark program can be distributed, I'd be interested in
>>> having a look at it.
>> Sure. I'm doing cognitive modeling research using ACT-R
>> (http://act-r.psy.cmu.edu/)
>> In order to run it using sbcl, you have to apply some patches that you=

>> can find here: http://www.unibw.de/lrt11/halbruegge/ACT-R
>>
>> The actual benchmark task is a cognitive model written in ACT-R. I can=

>> put that one online if you're interested.
>=20
> That'd be great. Thanks.
>=20

It's here:
http://www.unibw.de/lrt11/team/mitarbeiter/halbruegge/ACT-R/act-r-benchma=
rk.lisp

Rudimentary instructions can be found here:
http://www.unibw.de/lrt11/halbruegge/ACT-R

E-Mail me if you need more info...

Greetings
Marc