Tracing And Profiling Production Code With Systemtap-Books Pdf

Tracing and profiling production code with SystemTap
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Who is Adrien Kunysz, I Senior Technical Support Engineer at Red Hat UK. I when your sysadmin calls support I pick up the phone. I co founder of FSUGAr Belgium, I Krunch or adk on Freenode. I I like to look at core files and to read code, I but sometimes you need something more dynamic. I I am just a happy SystemTap user not a developer. I I am more into systems and low level stuff not so much into. web applications, I so let me know when I stop making sense. What are we going to discuss, Explaining SystemTap.
Practical Examples, Requirements and safety, Conclusion. What is SystemTap, According to http sourceware org systemtap. SystemTap provides free software GPL infrastructure to. simplify the gathering of information about the running. Linux system This assists diagnosis of a performance or. functional problem SystemTap eliminates the need for. the developer to go through the tedious and disruptive. instrument recompile install and reboot sequence that. may be otherwise required to collect data, I allows you to observe about anything about a running system. I this includes your applications internals, I obviously designed for kernel and C people. I but recent developments makes it higher level friendly. I this talk doesn t cover kernel tracing at all, How does it work.
1 write or choose a script describing what you want to observe. 2 stap translates it into a kernel module, 3 stap loads the module and communicates with it. 4 just wait for your data, The five stap passes, s t a p v t e s t s t p. P a s s 1 p a r s e d u s e r s c r i p t and 38 l i b r a r y s c r i p t s i n. 150 u s r 20 s y s 183 r e a l ms, P a s s 2 a n a l y z e d s c r i p t 1 p r o b e s 5 f u n c t i o n s 14. embed s 0 g l o b a l s i n 110 u s r 110 s y s 242 r e a l ms. Pass 3 t r a n s l a t e d to C i n t o, tmp s t a p E j E d 0 T s t a p 6 4 5 5 0 1 1 c 4 7 7 a 1 9 e c 8 c 7 b b d 5 a c 1 2 a 9 c d 0 1 3. i n 0 u s r 0 s y s 0 r e a l ms, Pass 4 compiled C i n t o.
s t a p 6 4 5 5 0 1 1 c 4 7 7 a 1 9 e c 8 c 7 b b d 5 a c 1 2 a 9 c d 0 1 3 6 0 8 ko i n. 1250 u s r 240 s y s 1685 r e a l ms, Pass 5 s t a r t i n g run. s c r i p t output goes here, P a s s 5 r u n c o m p l e t e d i n 20 u s r 30 s y s 4204 r e a l ms. SystemTap probe points examples, SystemTap is all about executing certain actions when hitting. certain probe points, I process bin ls function, I when entering any function in bin ls not its libraries or. I process lib libc so 6 function malloc, I when entering any glibc function which has malloc in its.
I timer ms 200, I every 200 milliseconds, More probe points examples. I kernel function init, kernel function exit return. I when entering any kernel function which has init in its name. or returning from any kernel function which has exit in its. I process postgres mark query start, I when starting a PostgreSQL query. I hotspot method entry, I when entering any Java method. I python function return, I when returning from any Python function.
See man stapprobes and usr share systemtap tapset for. SystemTap programming language, I mostly C style syntax with a feeling of awk. I builtin associative arrays, I builtin aggregates of statistical data. I very easy to collect data and do statistics on it average min. I many helper functions builtin and in tapsets, RTFM SystemTap Language Reference shipped with SystemTap. langref pdf, Some helper functions examples, pid which process is this. execname what is the name of this process, tid which thread is this.
gettimeofday s epoch time in seconds, probefunc what function are we in. print backtrace figure out how we ended up here C only. print jstack same for Java, There are many many more RTFM man stapfuncs and explore. usr share systemtap tapset, Some cool stap options. x trace only specified PID, c run given command and only trace it and its children. L list probe points matching given pattern along with. available variables, e write your stap script on the command line.
g embed C code in stap script, I unsafe dangerous and fun. Explaining SystemTap, Practical Examples, Requirements and safety. Conclusion, Example 1 adding a printf in a C program. Listing 1 example1 c, 1 i n c l u d e s t d l i b h. 3 int plopify int n n o t s u r e we a r e r e a c h i n g t h i s. 4 r e t u r n n n, 7 i n t main i n t a r g c c h a r a r g v.
8 i n t n argc 1 a t o i argv 1 0, 9 i f n 2 0, 10 n plopify n. 11 return n, Listing 2 example1 stp, 1 p r o b e 1. 2 p r i n t f we h i t t h e p r o b e a t s n, ctime gettimeofday s. Example 1 continued adding a printf in a C program. 1 c c g o e x a m p l e 1 e x a m p l e 1 c, 2 s t a p L p r o c e s s e x a m p l e 1 f u n c t i o n. 3 p r o c e s s e x a m p l e 1 f u n c t i o n main example1 c 7 a r g c i n t. a r g v c h a r n i n t, 4 p r o c e s s e x a m p l e 1 f u n c t i o n p l o p i f y e x a m p l e 1 c 3 n i n t.
6 stap example1 s t p, p r o c e s s e x a m p l e 1 f u n c t i o n p l o p i f y c. example1 42, 7 we h i t t h e p r o b e a t Sun Oct 10 1 1 1 9 4 0 2010. Example 1 continued adding a printf in a C program. Want to add the printf when exiting the function instead. p r o c e s s example1 f u n c t i o n p l o p i f y r e t u r n. When hitting a specific line in the file, p r o c e s s e x a m p l e 1 s t a t e m e n t example1 c 1 0. When hitting the third line within the main function. p r o c e s s e x a m p l e 1 s t a t e m e n t main 3. When hitting every line between 9 and 11, p r o c e s s e x a m p l e 1 s t a t e m e n t example1 c 9 11. The ve stap passes stap v test stp Pass 1 parsed user script and 38 library script s in 150usr 20 sys 183 real ms Pass 2 analyzed script 1 probe s 5 function s 14

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