fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<franks2> root@terminalserver1018:~/php7.2-7.2.19/sapi/apache2handler# stap -l 'process.provider("php").mark("*")' -c 'sapi/apache2handler/mod_php -i'
<franks2> Tip: /usr/share/doc/systemtap/README.Debian should help you get started.
<franks2> Can someone tell me whats wrong with this command line?
<modem_> fche: worked, thanks
<fche> modem_, would love to hear more about what you found sometime
<fche> (in general)
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<fche> success or failure stories of the tool are valuable
<modem_> fche: yeah so i basically ran the script linetimes.stp on the function i needed to debug
<modem_> it showed strong hint of the separation of avg time spent in each subroutines
<modem_> which help me reducing by 40% my overhead by just disabling one of the subroutine
<modem_> all the others subroutines are mostly equivalent
<modem_> so yeah basically it did its job to just identify the source of the massive slowdown i was experiencing
<fche> well, that is awesome, glad the widget could help!
<modem_> overall and in general i dropped gdb 99% of my time to just probe function
<modem_> i do use systemtap every week for 5years
<fche> heh
<modem_> i created a tons of script
<fche> if you have usability improvement ideas, that'd be great to hear
<modem_> most of them to each surface i debug
<modem_> sure i have a ton
<fche> and if your scripts are general purpose, we would love to add them to the library
<modem_> first of all where is this damn hexdump() ;PPPp
<fche> or even educational, if not general purpose
<modem_> yeah
<modem_> i sent here a bunch of them but there are never been integrated
<fche> printf("%*m") is hex dump
<modem_> i should just mail you and prepare something done a bit better
<modem_> fche: no
<modem_> fche: you need hexdump (data, len)
<modem_> can work with an address
<fche> printf("%*M", len, ptr)
<modem_> oh
<modem_> ok
<modem_> i didn't knew
<modem_> ptr can be a kernel addr ?
<fche> yes, or user; depends on presence of # flag
<fche> see
<fche> see [man stap]
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<franks2> Fche can you take a Quick stab at my q?
<fche> franks2,
<fche> is sapi/apache2handler/mod_php accessible from the $cwd?
<fche> you can use stap -vvv to get more verbose output
<fche> stap -L 'process("/full/path/to/executable").mark("*")' should work without the -c business
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