[cfe-users] Improve compile performance when using Clang 3.6

[Alexey Samsonov]

+Kuba, Anna

Sorry for the late response. Unfortunately, I don't have a Mac machine to
experiment on...
Do you have the numbers for plain -fsanitize=address, or plain
-fsanitize=undefined, or
subset of UBSan checks, such as -fsanitize=shift, -fsanitize=alignment, etc?

We haven't observe visible slowdown recently, however we usually run ASan
on Linux, and use at least -O1.
Maybe the situation improved in trunk after recent Anna's fixes.


On Wed, Apr 1, 2015 at 11:19 PM, Jeffrey Walton <noloader at gmail.com> wrote:

> Hi Alexey,
>
> >> Is there anything obvious I am missing that might affect the
> >> performance between 3.5 and 3.6? Like is something enabled that used
> >> to be disabled or missing?
> > ...
> > Interesting. Could you share the performance numbers, and try to figure
> out
> > which specific sanitizer
> > is causing a problem (i.e. try to compare just -fsanitize=address, and
> then
> > various flavors of -fsanitize=undefined
> > one by one: -fsanitize=shift, -fsanitize=null etc.). We are not aware of
> > known performance degradation under
> > sanitizers in 3.6 release.
>
> Here are the performance numbers that I am experiencing. All tests
> were run on the same machine (OS X 10.8.5, fully patched).
>
> 3.4.2:  ~5 minutes
> 3.5:      ~7 minutes, 30 seconds
> 3.6:      ~9 minutes
>
> I'm used to building with Clang 3.3 and 3.4, so I wanted to include
> one of those versions. With 3.6, the time has nearly doubled.
>
> Are the numbers above on par with what you would expect?
>
> Jeff
>
> ***** Crypto++ *****
>
> If interested, you can checkout Crypto++ with:
>
>     svn checkout https://svn.code.sf.net/p/cryptopp/code/trunk/c5 cryptopp
>
> Tweaks to the GNUmakefile include: -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined
>
> A full GNUmakefile diff is available at http://pastebin.com/3mqEBKzP.
>
> ***** Clang 3.4.2 *****
>
> Elapsed time: 01:17:06 - 01:12:05 ~= 5 minutes.
>
> $ export CXX=/usr/local/bin/clang++
> $ $CXX --version
> clang version 3.4.2 (tags/RELEASE_34/dot2-final)
> Target: x86_64-apple-darwin12.6.0
> Thread model: posix
> $ date && make static && date
> Thu Apr  2 01:12:05 EDT 2015
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -DCRYPTOPP_DISABLE_ASM -pipe -c 3way.cpp
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -DCRYPTOPP_DISABLE_ASM -pipe -c adler32.cpp
> ...
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -DCRYPTOPP_DISABLE_ASM -pipe -c zlib.cpp
> libtool -static -o libcryptopp.a 3way.o adler32.o algebra.o algparam.o
> arc4.o asn.o authenc.o base32.o base64.o ...
> ranlib libcryptopp.a
> Thu Apr  2 01:17:06 EDT 2015
>
> ***** Clang 3.5 *****
>
> Elapsed time: 00:31:53 - 00:24:36 ~= 7 minutes, 30 seconds.
>
> $ export CXX=/usr/local/bin/clang++
> $ $CXX --version
> clang version 3.5.0 (tags/RELEASE_350/final)
> Target: x86_64-apple-darwin12.6.0
> Thread model: posix
> $ date && make static && date
> Thu Apr  2 00:24:36 EDT 2015
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -DCRYPTOPP_DISABLE_ASM -pipe -c 3way.cpp
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -DCRYPTOPP_DISABLE_ASM -pipe -c adler32.cpp
> ...
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -DCRYPTOPP_DISABLE_ASM -pipe -c zlib.cpp
> libtool -static -o libcryptopp.a 3way.o adler32.o algebra.o algparam.o
> arc4.o asn.o authenc.o base32.o base64.o ...
> ranlib libcryptopp.a
> Thu Apr  2 00:31:53 EDT 2015
>
> ***** Clang 3.6 *****
>
> Elapsed time: 2:17:01 - 02:07:53 ~= 9 minutes.
>
> $ export CXX=/usr/local/bin/clang++
> $ $CXX --version
> clang version 3.6.0 (tags/RELEASE_360/final)
> Target: x86_64-apple-darwin12.6.0
> Thread model: posix
> $ date && make static && date
> Thu Apr  2 02:07:53 EDT 2015
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -I/usr/lib/c++/v1 -DCRYPTOPP_DISABLE_ASM -pipe -c 3way.cpp
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -I/usr/lib/c++/v1 -DCRYPTOPP_DISABLE_ASM -pipe -c adler32.cpp
> ...
> /usr/local/bin/clang++ -DNDEBUG -g3 -Os -fPIC -stdlib=libc++
> -fsanitize=address -fsanitize=undefined -Wall
> -Wno-tautological-compare -Wno-unused-value -Wno-unused-variable
> -Wno-unused-parameter -Wno-unused-function -I/usr/lib/c++/v1
> -I/usr/lib/c++/v1 -DCRYPTOPP_DISABLE_ASM -pipe -c zlib.cpp
> libtool -static -o libcryptopp.a 3way.o adler32.o algebra.o algparam.o
> arc4.o asn.o authenc.o base32.o base64.o ...
> ranlib libcryptopp.a
> Thu Apr  2 02:17:01 EDT 2015
>



-- 
Alexey Samsonov
vonosmas at gmail.com
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