On Fri, 30 Jan 2009 08:33:53 -0800 (PST), Alejandro
<alejandro.weinst...@gmail.com> wrote:
On Jan 30, 9:11 am, Jean-Paul Calderone <exar...@divmod.com> wrote:
[clarification about threads]
Thank you for the clarification. I will reformulate my question:
pstree and also ntop (but not top) show a number for each thread, like
for instance:
$pstree -p 9197
python(9197)€ˆ€{python}(9555)
†€{python}(9556)
†€{python}(9557)
†€{python}(9558)
†€{python}(9559)
†€{python}(9560)
†€{python}(9561)
†€{python}(9562)
†€{python}(9563)
„€{python}(9564)
Is is possible to get the number corresponding to each thread?
The reason I am interested is because one of my thread is hogging the
CPU, and want to find which one is the culprit.
I think someone mentioned calling gettid using ctypes earlier in this
thread. Unfortunately, this is somewhat convoluted:
exar...@charm:~$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import ctypes, os, threading, time
>>> os.system("pstree -p " + str(os.getpid()))
python(11427)───sh(11429)───pstree(11430)
0
>>> threading.Thread(target=time.sleep, args=(1000,)).start()
>>> os.system("pstree -p " + str(os.getpid()))
python(11427)─┬─sh(11436)───pstree(11437)
└─{python}(11431)
0
>>> ctypes.CDLL('libc.so.6').syscall(224)
11427
>>>
224 comes from grepping /usr/include for SYS_gettid. This is Linux
specific, and probably even architecture specific. For a quick
debug hack, perhaps this is good enough, though.
Jean-Paul
--
http://mail.python.org/mailman/listinfo/python-list
