LinuxQuestions.org
Visit Jeremy's Blog.
Go Back   LinuxQuestions.org > Forums > Non-*NIX Forums > Programming
User Name
Password
Programming This forum is for all programming questions.
The question does not have to be directly related to Linux and any language is fair game.

Notices


Reply
  Search this Thread
Old 10-13-2005, 03:48 AM   #1
zen_buddha
LQ Newbie
 
Registered: Oct 2005
Posts: 3

Rep: Reputation: 0
CPU Usage goes to 100% when pthread_cond_wait is being used


Hi All,

The CPU Usage of my process goes to 100% when I am trying to use the
pthread_cond_wait() in my threads. The same is not occuring at my
SuSE Linux 9.1. But, I am getting this problem only at Redhat Enterprise 3.2

The Kernel I am using in Redhat is : 2.4.21-15.ELsmp
The compiler Version I am using is : gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-34)

The SuSE Linux Kernel Version is : 2.6.4-52-default
The compiler version in SuSE Linux is : gcc version 3.3.3 (SuSE Linux)

gdb capture for this application is
----------------------------------------------

(gdb) attach 14464
Attaching to process 14464
Reading symbols from /home/xchgusr/bin/xchadapter...done.
Using host libthread_db library "/lib/tls/libthread_db.so.1".
Reading symbols from /lib/tls/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread -1235520704 (LWP 14464)]
[New Thread -1383351376 (LWP 14480)]
[New Thread -1372861520 (LWP 14479)]
[New Thread -1351881808 (LWP 14477)]
[New Thread -1341391952 (LWP 14476)]
[New Thread -1330902096 (LWP 14475)]
[New Thread -1320412240 (LWP 14474)]
[New Thread -1309922384 (LWP 14473)]
[New Thread -1299432528 (LWP 14472)]
[New Thread -1288942672 (LWP 14471)]
[New Thread -1278452816 (LWP 14470)]
[New Thread -1267962960 (LWP 14469)]
[New Thread -1257473104 (LWP 14468)]
[New Thread -1246983248 (LWP 14467)]
[New Thread -1236493392 (LWP 14466)]
Loaded symbols for /lib/tls/libpthread.so.0
Reading symbols from /u01/app/oracle/OraHome_1/lib/libclntsh.so.10.1...done.
Loaded symbols for /u01/app/oracle/OraHome_1/lib/libclntsh.so.10.1
Reading symbols from /home/xchgusr/lib/libbse.so.1.0...done.
Loaded symbols for /home/xchgusr/lib/libbse.so.1.0
Reading symbols from /home/xchgusr/lib/libnse.so.1.0...done.
Loaded symbols for /home/xchgusr/lib/libnse.so.1.0
Reading symbols from /home/xchgusr/lib/libnsefno.so.1.0...done.
Loaded symbols for /home/xchgusr/lib/libnsefno.so.1.0
Reading symbols from /usr/lib/libstdc++.so.5...done.
Loaded symbols for /usr/lib/libstdc++.so.5
Reading symbols from /lib/tls/libm.so.6...done.
Loaded symbols for /lib/tls/libm.so.6
Reading symbols from /lib/libgcc_s.so.1...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /u01/app/oracle/OraHome_1/lib/libnnz10.so...done.
Loaded symbols for /u01/app/oracle/OraHome_1/lib/libnnz10.so
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libnsl.so.1...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libnss_files.so.2...done.
Loaded symbols for /lib/libnss_files.so.2
0xb75c9c18 in pthread_join () from /lib/tls/libpthread.so.0
(gdb) info threads
15 Thread -1236493392 (LWP 14466) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
14 Thread -1246983248 (LWP 14467) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
13 Thread -1257473104 (LWP 14468) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
12 Thread -1267962960 (LWP 14469) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
11 Thread -1278452816 (LWP 14470) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
10 Thread -1288942672 (LWP 14471) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
9 Thread -1299432528 (LWP 14472) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
8 Thread -1309922384 (LWP 14473) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
7 Thread -1320412240 (LWP 14474) 0xb75cb1fb in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
6 Thread -1330902096 (LWP 14475) 0xb75cd6b4 in __pthread_disable_asynccancel () from /lib/tls/libpthread.so.0
5 Thread -1341391952 (LWP 14476) 0xb75cd6b4 in __pthread_disable_asynccancel () from /lib/tls/libpthread.so.0
4 Thread -1351881808 (LWP 14477) 0xb75cd6b4 in __pthread_disable_asynccancel () from /lib/tls/libpthread.so.0
3 Thread -1372861520 (LWP 14479) 0xb75cdb3e in accept () from /lib/tls/libpthread.so.0
2 Thread -1383351376 (LWP 14480) 0xb68da337 in ___newselect_nocancel () from /lib/tls/libc.so.6
1 Thread -1235520704 (LWP 14464) 0xb75c9c18 in pthread_join () from /lib/tls/libpthread.so.0
(gdb)

Sample program using pthread_cond_wait() is not using CPU Usage.
Note: I measured CPU Usage through top utility.

If anybody overcome this kind of problem, please help me to solve
this problem.

Thank you....
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
CPU Usage goes to 100% when pthread_cond_wait is being used zen_buddha Linux - Software 4 10-19-2005 04:28 PM
Hotwayd - 100% CPU Usage Hoaxbe Linux - Software 2 10-03-2005 05:18 PM
CPU goes to (100% usage) without any task medo Linux - Hardware 4 04-19-2004 07:13 PM
CPU usage 100% ecsfan Red Hat 17 11-19-2003 03:06 PM
100 % CPU usage ???? rolandi Linux - Newbie 1 10-07-2003 11:52 PM

LinuxQuestions.org > Forums > Non-*NIX Forums > Programming

All times are GMT -5. The time now is 11:35 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration