Thomas Heller-7 wrote:
On Monday, March 28, 2011 05:25:13 AM Jeremy Maitin-Shepard wrote: > On 03/26/2011 03:19 PM, Lorenzo Caminiti wrote: > > Hello all, > > > > I am updating Boost.Local docs and I could use a some help in getting > > the Alternatives section right > > http://svn.boost.org/svn/boost/sandbox/local/libs/local/doc/html/boost_local... > > You might include compile time and run time benchmarks, information > about error message quality, and polymorphic capabilities. > Additionally, you might note that with C++0x local classes can be used > with templates.
Just did a quick test ... code is attached ...
$ time g++ -O3 -I. -Wall -Wextra add.cpp -o add
real 0m0.657s user 0m0.583s sys 0m0.067s
$ time ./add 1e+12
real 0m35.641s user 0m35.618s sys 0m0.017s
$ time g++ -O3 -I. -Wall -Wextra add_boost_phoenix.cpp -o add_phoenix
real 0m3.385s user 0m3.160s sys 0m0.217s thomas@sunshine ~/programming/local $ time ./add_phoenix 1e+12
real 0m6.648s user 0m6.643s sys 0m0.007s
This is not a fare comparison because add.cpp contains also local blocks and exits while add_boost_phoenix.cpp contains only local functions. The comparison should be made between add_boost_local.cpp and add_boost_phoenix.cpp (see below). The example names got a bit confusing and I will rename add.cpp to add_funciton_block_exit.cpp to avoid similar misunderstandings in the future. A quick compile and run time comparison using Cygwin. I have ran `time` 3 times and I am reporting the result with the middle `real` value. I will get more statistically meaningful results (avg and std-dev over 100 executions...) and on a real Linux system. Compile-Time ($ time g++ -O3 -Wall -Wextra -I... ) ------------- Boost.Local (add_boost_local.cpp) real = 6.188 s user = 0.885 s system = 1.495 s Local Classes (add_local_class.cpp) real = 3.828 s user = 0.525 s system = 0.464 s C++0x Lambas (add_cpp0x_lambda.cpp) Not available. Boost.Lambda (add_boost_lambda.cpp) real = 5.515 s user = 0.948 s system = 1.136 s Boost.Phoenix (add_boost_phoenix.cpp) real = 12.641 s user = 3.619 s system = 3.074 s Run-Time ($ time ) --------- Boost.Local (add_boost_local.cpp) real = 0.547 s user = 0.030 s system = 0.030 s Local Classes (add_local_class.cpp) real = 0.532 s user = 0.030 s system = 0.061 s C++0x Lambas (add_cpp0x_lambda.cpp) Not available. Boost.Lambda (add_boost_lambda.cpp) real = 0.438 s user = 0.030 s system = 0.046s Boost.Phoenix (add_boost_phoenix.cpp) real = 0.500 s user = 0.030 s system = 0.046 s These Boost.Local compile and run time performances look decent to me when compared with the other approaches (including the local class functor). --Lorenzo http://boost.2283326.n4.nabble.com/file/n3412415/add_boost_local.cpp add_boost_local.cpp http://boost.2283326.n4.nabble.com/file/n3412415/add_local_class.cpp add_local_class.cpp http://boost.2283326.n4.nabble.com/file/n3412415/add_cpp0x_lambda.cpp add_cpp0x_lambda.cpp http://boost.2283326.n4.nabble.com/file/n3412415/add_boost_lambda.cpp add_boost_lambda.cpp http://boost.2283326.n4.nabble.com/file/n3412415/add_boost_phoenix.cpp add_boost_phoenix.cpp -- View this message in context: http://boost.2283326.n4.nabble.com/local-Help-for-the-Alternatives-section-t... Sent from the Boost - Dev mailing list archive at Nabble.com.