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How can I view threads for a running process that is creating threads?
How can i get the process with the biggest pid?How can I see i/o stats for a briefly running process?How I can identify that a process has multiple instancesCheck for process and kill if runningShow running processes only — *not* threadsHow to ensure exclusive CPU availability for a running process?What is a limit for number of threads?How to get the process that is runningGet list of processes that were forked off my currently running process?How to kill and rerun process in one command in Linux
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I made a very small program that creates two threads:
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void *start()
printf("Am a new thread!n");
printf("%dn",pthread_self());
void main()
pthread_t thread_id1;
pthread_t thread_id2;
pthread_create(&thread_id1,NULL,start,NULL);
pthread_create(&thread_id2,NULL,start,NULL);
//pthread_join(thread_id,NULL);
sleep(30);
When I compile and run the program with:
gcc create.c -lpthread
./a.out
And I open a new terminal and try to view the threads, this is what I get:
ps -efL | grep a.out
root 1943 20158 1943 0 1 15:25 pts/4 00:00:00 ./a.out
root 1985 1889 1985 0 1 15:25 pts/5 00:00:00 grep --color=auto a.out
So why can't I see two thread ids here?
linux-kernel ps process-management pthreads
asked Apr 4 at 21:27
alkabaryalkabary
61411124
add a comment |
I made a very small program that creates two threads:
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void *start()
printf("Am a new thread!n");
printf("%dn",pthread_self());
void main()
pthread_t thread_id1;
pthread_t thread_id2;
pthread_create(&thread_id1,NULL,start,NULL);
pthread_create(&thread_id2,NULL,start,NULL);
//pthread_join(thread_id,NULL);
sleep(30);
When I compile and run the program with:
gcc create.c -lpthread
./a.out
And I open a new terminal and try to view the threads, this is what I get:
ps -efL | grep a.out
root 1943 20158 1943 0 1 15:25 pts/4 00:00:00 ./a.out
root 1985 1889 1985 0 1 15:25 pts/5 00:00:00 grep --color=auto a.out
So why can't I see two thread ids here?
linux-kernel ps process-management pthreads
asked Apr 4 at 21:27
alkabaryalkabary
61411124
add a comment |
I made a very small program that creates two threads:
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void *start()
printf("Am a new thread!n");
printf("%dn",pthread_self());
void main()
pthread_t thread_id1;
pthread_t thread_id2;
pthread_create(&thread_id1,NULL,start,NULL);
pthread_create(&thread_id2,NULL,start,NULL);
//pthread_join(thread_id,NULL);
sleep(30);
When I compile and run the program with:
gcc create.c -lpthread
./a.out
And I open a new terminal and try to view the threads, this is what I get:
ps -efL | grep a.out
root 1943 20158 1943 0 1 15:25 pts/4 00:00:00 ./a.out
root 1985 1889 1985 0 1 15:25 pts/5 00:00:00 grep --color=auto a.out
So why can't I see two thread ids here?
linux-kernel ps process-management pthreads
asked Apr 4 at 21:27
alkabaryalkabary
61411124
I made a very small program that creates two threads:
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void *start()
printf("Am a new thread!n");
printf("%dn",pthread_self());
void main()
pthread_t thread_id1;
pthread_t thread_id2;
pthread_create(&thread_id1,NULL,start,NULL);
pthread_create(&thread_id2,NULL,start,NULL);
//pthread_join(thread_id,NULL);
sleep(30);
When I compile and run the program with:
gcc create.c -lpthread
./a.out
And I open a new terminal and try to view the threads, this is what I get:
ps -efL | grep a.out
root 1943 20158 1943 0 1 15:25 pts/4 00:00:00 ./a.out
root 1985 1889 1985 0 1 15:25 pts/5 00:00:00 grep --color=auto a.out
So why can't I see two thread ids here?
linux-kernel ps process-management pthreads
linux-kernel ps process-management pthreads
asked Apr 4 at 21:27
alkabaryalkabary
61411124
asked Apr 4 at 21:27
alkabaryalkabary
61411124
asked Apr 4 at 21:27
alkabaryalkabary
61411124
asked Apr 4 at 21:27
alkabaryalkabary
61411124
asked Apr 4 at 21:27
alkabaryalkabary
61411124
61411124
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The two additional threads write their message and terminate, so you don't have the time to see them with ps.
from man pthread_create:
The new thread terminates in one of the following ways:
*
It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same process that calls
pthread_join(3).
*
It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement.
[...]
You can follow what's going on for example with strace:
$ strace -f -e trace=clone,exit ./a.out
clone(strace: Process 409 attached
child_stack=0x7f7126930ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71269319d0, tls=0x7f7126931700, child_tidptr=0x7f71269319d0) = 409
[pid 408] clone(strace: Process 410 attached
child_stack=0x7f712612fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71261309d0, tls=0x7f7126130700, child_tidptr=0x7f71261309d0) = 410
Am a new thread!
Am a new thread!
647173888
638781184
[pid 409] exit(0 <unfinished ...>
[pid 410] exit(0 <unfinished ...>
[pid 409] <... exit resumed>) = ?
[pid 410] <... exit resumed>) = ?
[pid 410] +++ exited with 0 +++
[pid 409] +++ exited with 0 +++
answered 2 days ago
A.BA.B
5,94711030
add a comment |
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1 Answer
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oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The two additional threads write their message and terminate, so you don't have the time to see them with ps.
from man pthread_create:
The new thread terminates in one of the following ways:
*
It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same process that calls
pthread_join(3).
*
It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement.
[...]
You can follow what's going on for example with strace:
$ strace -f -e trace=clone,exit ./a.out
clone(strace: Process 409 attached
child_stack=0x7f7126930ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71269319d0, tls=0x7f7126931700, child_tidptr=0x7f71269319d0) = 409
[pid 408] clone(strace: Process 410 attached
child_stack=0x7f712612fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71261309d0, tls=0x7f7126130700, child_tidptr=0x7f71261309d0) = 410
Am a new thread!
Am a new thread!
647173888
638781184
[pid 409] exit(0 <unfinished ...>
[pid 410] exit(0 <unfinished ...>
[pid 409] <... exit resumed>) = ?
[pid 410] <... exit resumed>) = ?
[pid 410] +++ exited with 0 +++
[pid 409] +++ exited with 0 +++
answered 2 days ago
A.BA.B
5,94711030
add a comment |
The two additional threads write their message and terminate, so you don't have the time to see them with ps.
from man pthread_create:
The new thread terminates in one of the following ways:
*
It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same process that calls
pthread_join(3).
*
It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement.
[...]
You can follow what's going on for example with strace:
$ strace -f -e trace=clone,exit ./a.out
clone(strace: Process 409 attached
child_stack=0x7f7126930ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71269319d0, tls=0x7f7126931700, child_tidptr=0x7f71269319d0) = 409
[pid 408] clone(strace: Process 410 attached
child_stack=0x7f712612fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71261309d0, tls=0x7f7126130700, child_tidptr=0x7f71261309d0) = 410
Am a new thread!
Am a new thread!
647173888
638781184
[pid 409] exit(0 <unfinished ...>
[pid 410] exit(0 <unfinished ...>
[pid 409] <... exit resumed>) = ?
[pid 410] <... exit resumed>) = ?
[pid 410] +++ exited with 0 +++
[pid 409] +++ exited with 0 +++
answered 2 days ago
A.BA.B
5,94711030
add a comment |
The two additional threads write their message and terminate, so you don't have the time to see them with ps.
from man pthread_create:
The new thread terminates in one of the following ways:
*
It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same process that calls
pthread_join(3).
*
It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement.
[...]
You can follow what's going on for example with strace:
$ strace -f -e trace=clone,exit ./a.out
clone(strace: Process 409 attached
child_stack=0x7f7126930ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71269319d0, tls=0x7f7126931700, child_tidptr=0x7f71269319d0) = 409
[pid 408] clone(strace: Process 410 attached
child_stack=0x7f712612fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71261309d0, tls=0x7f7126130700, child_tidptr=0x7f71261309d0) = 410
Am a new thread!
Am a new thread!
647173888
638781184
[pid 409] exit(0 <unfinished ...>
[pid 410] exit(0 <unfinished ...>
[pid 409] <... exit resumed>) = ?
[pid 410] <... exit resumed>) = ?
[pid 410] +++ exited with 0 +++
[pid 409] +++ exited with 0 +++
answered 2 days ago
A.BA.B
5,94711030
The two additional threads write their message and terminate, so you don't have the time to see them with ps.
from man pthread_create:
The new thread terminates in one of the following ways:
*
It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same process that calls
pthread_join(3).
*
It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement.
[...]
You can follow what's going on for example with strace:
$ strace -f -e trace=clone,exit ./a.out
clone(strace: Process 409 attached
child_stack=0x7f7126930ff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71269319d0, tls=0x7f7126931700, child_tidptr=0x7f71269319d0) = 409
[pid 408] clone(strace: Process 410 attached
child_stack=0x7f712612fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f71261309d0, tls=0x7f7126130700, child_tidptr=0x7f71261309d0) = 410
Am a new thread!
Am a new thread!
647173888
638781184
[pid 409] exit(0 <unfinished ...>
[pid 410] exit(0 <unfinished ...>
[pid 409] <... exit resumed>) = ?
[pid 410] <... exit resumed>) = ?
[pid 410] +++ exited with 0 +++
[pid 409] +++ exited with 0 +++
answered 2 days ago
A.BA.B
5,94711030
answered 2 days ago
A.BA.B
5,94711030
answered 2 days ago
A.BA.B
5,94711030
answered 2 days ago
A.BA.B
5,94711030
5,94711030
add a comment |
add a comment |
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