RE: big performance gain

What makes me curious is the difference you see when you stop using CGI.pm. I realize this won't translate to the full-blown handler version of the script, but did you try loading CGI.pm via default in mod_perl, or did you have

use CGI;
[download]

in your script?

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Comment on RE: big performance gain Download Code

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RE: RE: big performance gain by KM (Priest) on Sep 08, 2000 at 20:11 UTC
Yeah, I would be interested in this too. Is CGI.pm being used from within a test script, or from startup.pl/httpd.conf? You could also try only importing things like use CGI qw/:standard/. I believe CGI.pm has some magic code inside to help with memory when you do so, although I haven't perused the source in quite some time now. Either way, if CGI.pm is being preloaded I wouldn't think you would see as much of a hit, since it stays resident in memory and isn't loaded each time the script is called. Cheers, KM	[reply]
RE: RE: big performance gain by le (Friar) on Sep 10, 2000 at 19:59 UTC
No, I didn't preload CGI.pm, I just said "use CGI qw(:standard);". I did this because I wanted to measure the performance of a CGI script that's handed over to Apache::Registry.	[reply]
RE: RE: RE: big performance gain by merlyn (Sage) on Sep 10, 2000 at 20:06 UTC
There's a huge performance difference between `use CGI` and `use CGI qw(:standard)` because the latter has to make 150 or so symbols through an import, where the former simply loads the "lincoln loader" selfloader and compiles subroutines as needed. -- Randal L. Schwartz, Perl hacker	[reply] [d/l] [select]
RE: RE: RE: RE: big performance gain by merlyn (Sage) on Sep 10, 2000 at 20:19 UTC
Following up to my own post, this invocation of the debugger shows just how many symbols were added by `CGI`: halfdome.holdit.com> perl -debug Loading DB routines from perl5db.pl version 1.0402 Emacs support available. Enter h or `h h' for help. main::(-e:1): bug DB<1> x scalar keys %main:: 0 73 DB<2> use CGI qw(:standard); DB<3> x scalar keys %main:: 0 227 DB<4> [download] Note that the `main` symbol table jumped from 73 stabs to 227 stabs. There's work behind this, and that's gonna slow you down a bit. It also takes a lot of space. -- Randal L. Schwartz, Perl hacker	[reply] [d/l]
Re: RE: RE: RE: RE: big performance gain by Anonymous Monk on Nov 13, 2001 at 20:24 UTC


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