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[Gcl-devel] Re: more random noise on timing
From: |
Camm Maguire |
Subject: |
[Gcl-devel] Re: more random noise on timing |
Date: |
02 Mar 2006 18:59:48 -0500 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
Robert Boyer <address@hidden> writes:
> Using Camm's cvs suggestion to get a Dec 14 2.7.0 GCL, things seem unchanged
> between then and now in terms of the Nqthm proofs. These are both with
> default MAXPAGES, ANSI.
>
> cvs -z9 -q co -d gcl -D 20051214 gcl
> run-gbc time : 1975.380 secs
> child run time : 147.250 secs
> gbc time : 59.520 secs
>
> Tuesday 2.7.0
> run-gbc time : 2000.970 secs
> child run time : 147.340 secs
> gbc time : 62.230 secs
>
> This is good news, suggesting that rumors of a slowdown since December are
> entirely false. Apologies for rumor mongering. But it creates a real
> mystery for me.
>
> Running in 2.7.0 just a few days ago, but in a huge (170 mb) saved image with
> very large ihs and vs stacks, I got 10% worse:
>
> run-gbc time : 2181.560 secs
> child run time : 141.280 secs
> gbc time : 94.930 secs
>
> So this supports Matt's position that size does matter, which I "disproved"
> yesterday, at least for a big MAXPAGE. I'm a bit lost. How could simply
> running in a saved image configured with with
>
> --enable-ihssize=2097152 \
> --enable-vssize=2097152 \
> --enable-maxpage=524288 \
> --enable-holediv=100 \
>
My guess is holediv, though if so the timing output should be
improved. Try holediv=16. The default is 4, and you are using 4x the
default maxpages.
The gc time is up by 50%, supporting this hypothesis. However, to be
material, this would have to mean that a substantial fraction of the
actual gc overhead is being accumulated in the run-gbc time statistic,
which at this point is just "idle speculation" :-).
Take care,
> cause a 10% slowdown? Or is this all some sort of "operator error" on my
> part? Sorry for wasting your time.
>
> Bob
>
>
>
>
>
--
Camm Maguire address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
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