Re: [PHP4BETA] ZTS mode sooo much slower?

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