Remove compilation optimization flag

Ruby Apps Redcloth
1

top output (compilation took about 10 minutes)

cc1 8.6% 5:13.31 1 13 365 730M+ 2.45M 519M-

1.13G

time to run all tests (3rd launch):
real 0m2.713s
user 0m1.321s
sys 0m0.306s

Without optimization flag (compilation takes 30 seconds):

cc1 84.0% 0:17.15 1 13 203 243M+ 4.42M 245M+

435M+

time to run all tests (3rd launch)
real 0m2.560s
user 0m1.323s
sys 0m0.319s

I think it would be a good change, especially when people compile this
on a server with limited memory and shared CPU resources…

PATCH:
Index: ext/superredcloth_scan/extconf.rb

— ext/superredcloth_scan/extconf.rb (revision 245)
+++ ext/superredcloth_scan/extconf.rb (working copy)
@@ -1,9 +1,6 @@
require ‘mkmf’

-if /darwin9/ =~ RUBY_PLATFORM

  • OSX 10.5 doesn’t like the default “-Os”

  • $CFLAGS << " -O1 "
    -end
    +$CFLAGS << " -O0 " # do not optimize (takes too much memory and
    performance gain is negligeable)

dir_config(“superredcloth_scan”)
have_library(“c”, “main”)

2

Gaspard:
Hey, wow! You’re my new favorite person. I’d been commenting out
nonessentials when I was working on something specific and just
waiting the 10 minutes when I wanted to see the whole thing work.

I’m committing this change. Johan, since you’re the one who
requested the -O1 flag, would you verify it still works for you in
Leopard?

If anyone knows a reason it’s bad to compile with -O0, now’s the time
to speak up.

Great work, Gaspard! Thanks!

Jason

3

On Wed, Feb 27, 2008 at 12:22:54PM -0500, Jason G. wrote:

I’m committing this change. Johan, since you’re the one who
requested the -O1 flag, would you verify it still works for you in
Leopard?

I agree, nice tweak! I’m playing with the Ragel flags and noticing
wildly different behaviors as well. (Using -G0, -T0, -T1, etc.
instead of -G2.) I’d really like to assemble a rake tasks that
would go through and try permutations of Ragel flags with GCC flags
and determine the most optimal settings.

For sure, though, compilation time was getting ridiculous.

_why

4

While trying ragel optimization settings, it would be good to record
the size of the output files, since I think it would be nice to
include these files in the gem in order to avoid ragel dependency for
those not modifying the gem.

Gaspard

2008/2/28, why the lucky stiff [email protected]: