python -mtrace --trace script.py

python -mtrace --trace script.py | egrep '^(mod1.py|mod2.py)'
- 

import pdb
pdb.set_trace() # opens up pdb prompt

try:
  code
  that
  fails
except:
  import pdb
  pdb.pm() # or pdb.post_mortem()

python -mpdb script.py

sudo apt-get install winpdb

import rpdb2
rpdb2.start_embedded_debugger("secretpassword")

import loggging
 
class Rdb(pdb.Pdb):
  """
  This will run pdb as a ephemeral telnet service. Once you connect no one
  else can connect. On construction this object will block execution till a
  client has connected.
 
  Based on https://github.com/tamentis/rpdb I think ...
 
  To use this::
 
    Rdb(4444).set_trace()
 
  Then run: telnet 127.0.0.1 4444
  """
  def __init__(self, port=0):
    self.old_stdout = sys.stdout
    self.old_stdin = sys.stdin
    self.listen_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    self.listen_socket.bind(('0.0.0.0', port))
    if not port:
      logging.critical("PDB remote session open on: %s", self.listen_socket.getsockname())
      print >> sys.__stderr__, "PDB remote session open on:", self.listen_socket.getsockname()
      sys.stderr.flush()
    self.listen_socket.listen(1)
    self.connected_socket, address = self.listen_socket.accept()
    self.handle = self.connected_socket.makefile('rw')
    pdb.Pdb.__init__(self, completekey='tab', stdin=self.handle, stdout=self.handle)
    sys.stdout = sys.stdin = self.handle
 
  def do_continue(self, arg):
    sys.stdout = self.old_stdout
    sys.stdin = self.old_stdin
    self.handle.close()
    self.connected_socket.close()
    self.listen_socket.close()
    self.set_continue()
    return 1
 
  do_c = do_cont = do_continue
 
def set_trace():
  """
  Opens a remote PDB on first available port.
  """
  rdb = Rdb()
  rdb.set_trace()

import IPython
IPython.embed()

sudo apt-get install htop
sudo htop

dstat --cpu --io --mem --net --load --fs --vm --disk-util --disk-tps --freespace --swap --top-io --top-bio-adv

sudo apt-get install gdb python-dbg
zcat /usr/share/doc/python2.7/gdbinit.gz > ~/.gdbinit
run app with python2.7-dbg
sudo gdb -p 12345

>>> import faulthandler
>>> faulthandler.enable()

>>> import objgraph
>>> objs = objgraph.by_type("Request")[:15]
>>> objgraph.show_backrefs(objs, max_depth=20, highlight=lambda v: v in objs, filename="/tmp/graph.png")
Graph written to /tmp/objgraph-zbdM4z.dot (107 nodes)
Image generated as /tmp/graph.png

apt-get source python2.7 cd python2.7-*
wget https://github.com/wyplay/pytracemalloc/raw/master/python2.7_track_free_list.patch
patch -p1 < python2.7_track_free_list.patch
debuild -us -uc cd ..
sudo dpkg -i python2.7-minimal_2.7*.deb python2.7-dev_*.deb

import tracemalloc, time
tracemalloc.enable()
top = tracemalloc.DisplayTop(
  5000, # log the top 5000 locations
  file=open('/tmp/memory-profile-%s' % time.time(), "w")
)
top.show_lineno = True
try:
  # code that needs to be traced
finally:
  top.display()

2013-05-31 18:05:07: Top 5000 allocations per file and line
#1: .../site-packages/billiard/_connection.py:198: size=1288 KiB, count=70 (+0), average=18 KiB
#2: .../site-packages/billiard/_connection.py:199: size=1288 KiB, count=70 (+0), average=18 KiB
#3: .../python2.7/importlib/__init__.py:37: size=459 KiB, count=5958 (+0), average=78 B
#4: .../site-packages/amqp/transport.py:232: size=217 KiB, count=6960 (+0), average=32 B
#5: .../site-packages/amqp/transport.py:231: size=206 KiB, count=8798 (+0), average=24 B
#6: .../site-packages/amqp/serialization.py:210: size=199 KiB, count=822 (+0), average=248 B
#7: .../lib/python2.7/socket.py:224: size=179 KiB, count=5947 (+0), average=30 B
#8: .../celery/utils/term.py:89: size=172 KiB, count=1953 (+0), average=90 B
#9: .../site-packages/kombu/connection.py:281: size=153 KiB, count=2400 (+0), average=65 B
#10: .../site-packages/amqp/serialization.py:462: size=147 KiB, count=4704 (+0), average=32 B
 
...