Profiling..entry for a function in pthread

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Top Forums UNIX for Advanced & Expert Users Profiling..entry for a function in pthread_create Post 82068 by Vikky Panchal on Saturday 27th of August 2005 05:42:08 AM

08-27-2005

Registered User

Profiling..entry for a function in pthread_create

Hello,

i am try to write a profiler for a multithreaded applciation. When i creat e a thread for "function f2()" the profiling information for this function does not get captured in the struct profileManager. i;e i get the exit information for "function f2()" in that thread, but the entry information does not get captured. Is it because the profiling function "__cyg_profile_func_enter" does not get inserted fot that thread? Do i have to use pthread_once_t to initialize so that its entry gets profiled??

Thanks,
Vikky.

////**** This is my instrument.c file ****/////
static FILE *fp;

struct profileManager{
pid_t pth;
pthread_t th;
char Ch;
int addr;
struct timeval tp;
}pM[1000];

static int cnt=0;

void __cyg_profile_func_enter( void *this, void *callsite ) {
pthread_mutex_lock(&Lock);
pM[cnt].pth=getpid();
pM[cnt].th=pthread_self();
pM[cnt].Ch='E';
pM[cnt].addr=(int*)this;
gettimeofday(&pM[cnt].tp,NULL);
cnt++;
pthread_mutex_unlock(&Lock);
}

void __cyg_profile_func_exit( void *this, void *callsite ) {
pthread_mutex_lock(&Lock);
pM[cnt].pth=getpid();
pM[cnt].th=pthread_self();
pM[cnt].Ch='X';
pM[cnt].addr=(int*)this;
gettimeofday(&pM[cnt].tp,NULL);
cnt++;
pthread_mutex_unlock(&Lock);
}

////***** my sample code test.c ****/////
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>

int f1(int i){
sleep(1);
if(i==1)
return 0;
f1(i-1);
}

void f3(){
f1(5);
}

void* f2(void* arg){
f3();
}

void f4(){
sleep(1);
}

int main(){
int i;
pthread_t th;
int code;

code = pthread_create(&th,NULL,f2,NULL); ///Create Thread for F2
if(code==0)
printf("Thread created %d\n",th);
printf("Hello World\n");
(void)f2(NULL);
for(i=0;i<5;i++)
f4();
sleep(10);
return 0;
}

Vikky Panchal

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lm-profiler

LM-PROFILER(8)						      System Manager's Manual						    LM-PROFILER(8)

NAME

       /usr/sbin/lm-profiler - laptop mode profiler

SYNOPSIS

       /usr/sbin/lm-profiler

DESCRIPTION

       This  manual page documents briefly the /usr/sbin/lm-profiler command. lm-profiler is a tool for profiling disk operations. It is a part of
       laptop mode tools and is useful only in relation to rest of laptop mode tools. It helps you to detect programs and  services  that  use	up
       system resources and that cause disk activity, and it allows you to disable them when laptop mode is active.

       When  you start lm-profiler, it will execute a "profiling run", which can take some time. Start lm-profiler when you are working on batter-
       ies, preferably, because that will allow it to analyze the actual situation that it is supposed to optimize. During the profiling run,  you
       can  use  your system normally; however, any disk activity caused by your actions will end up in the profiler's results. When the profiling
       run is finished, you will be presented with a list of programs that deserve your attention, either because they listen on a network  (which
       is  not	usually  useful when you are working offline) or because they caused disk activity in a disk-spindown-unfriendly pattern. When lm-
       profiler can guess an init script that belongs to a program, it presents you with the opportunity to disable the program when you are work-
       ing  on battery. It does this by placing a link to the init script in /etc/laptop-mode/batt-stop. Any programs that lm-profiler cannot find
       an init script for is simply reported, so that you can stop the program manually if you want to.

       WARNING ABOUT DISABLING PROGRAMS: It may not be safe to disable some programs. They may be needed for proper operation of your system. Dis-
       able services only if you know what they do and why you don't need them.

FILES

       /etc/lm-profiler.conf
	      lm-profiler retrieves its profiling rules from this file.

SEE ALSO

       lm-profiler.conf(8).

       laptop-mode.conf(8).

       daemons.conf(8).

AUTHOR

       This manual page was written by Bart Samwel (bart@samwel.tk) and Jan Polacek (jerome@ucw.cz) for the Debian system (but may be used by oth-
       ers).  Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License,	Version  2
       any later version published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																    LM-PROFILER(8)