Re: [PHP4BETA] ZTS mode sooo much slower? (see attachment)

hi - the attached files are "annotated sources" created by quantify! the intresting thing seems to be that yy_get_previous_state gets called 156077 times in C++ mode but only 28 times in c-more... quantify tells me that system-calls have little/no impact in this test-case. i also want to mention that the test-script does *NOT* execute a lot of code but it defines a *LOT* of functions. i believe something MUST be rotten in c++ mode (maybe contact the flex guys?) tc On Tue, 7 Sep 1999, Stig Bakken wrote: > On Mon, 6 Sep 1999, Zeev Suraski wrote: > > > At 16:31 06/09/1999 , Thies C. Arntzen wrote: > > >hi, > > > > > >just did soem "benchmarking" of zts mode agains "plain" mode on > > >unix > > >(solaris gcc 2.8.1) - > > > > > >this test-case just has no real code running - just included > 20 php files. > > > > > > ZTS non-ZTS > > >real 4.20 0.57 > > >user 3.98 0.45 > > >sys 0.05 0.10 > > > > > >quantify tells me that the c++ parser eats most of the time. > > > > > >(% of .root.) > > > > > >63% zendFlexLexer::yy_get_previous_state() > > >12% ZendFlexLexer::lex_scan(...) > > >7% zendFlexLexer::yy_get_next_buffer(...) > > >2% zendparse() > > > > > >in "not-ZTS-mode" zendparse is the "busiest" function... > > > > > >are flex-generated c++ lexers known to be *SLOW* or am i doing something > > >wrong? > > > > It could be that the C++ compiler is much less efficient and doesn't know > > how to optimize very well. On a busy site, this can become negligible with > > the persistent registry. > > Nothing is ever negligible on busy sites. :-) > > The C++ compiler adds some execution overhead, but that is (normally) in > the range 5-10%, not hundreds of them. > > Zeev, have you done any testing of the same on Windows? I assume MSVC > produces much faster C++ code than gcc. > > - Stig > > > -- > PHP 4 Beta > > Thies C. Arntzen "One Big-Mac, Small Fries and a Coke!" Digital Collections Phone +49 40 235350 Fax +49 40 23535180 Hammerbrookstr. 93 20097 Hamburg / Germany