A Task Based Parallelization Framework
Project description
Jug allows you to write code that is broken up into tasks and run different tasks on different processors.
It uses the filesystem to communicate between processes and works correctly over NFS, so you can coordinate processes on different machines.
Jug is a pure Python implementation and should work on any platform.
Python 2.6/2.7 and Python 3.3 are supported.
Website: http://luispedro.org/software/jug
Documentation: https://jug.readthedocs.org/
Mailing List: http://groups.google.com/group/jug-users
Short Example
Here is a one minute example. Save the following to a file called primes.py:
from jug import TaskGenerator
from time import sleep
@TaskGenerator
def is_prime(n):
sleep(1.)
for j in xrange(2,n-1):
if (n % j) == 0:
return False
return True
primes100 = map(is_prime, xrange(2,101))
Of course, this is only for didactical purposes, normally you would use a better method. Similarly, the sleep function is so that it does not run too fast.
Now type jug status primes.py to get:
Task name Waiting Ready Finished Running ---------------------------------------------------------------------- primes.is_prime 0 99 0 0 ...................................................................... Total: 0 99 0 0
This tells you that you have 99 tasks called primes.is_prime ready to run. So run jug execute primes.py &. You can even run multiple instances in the background (if you have multiple cores, for example). After starting 4 instances and waiting a few seconds, you can check the status again (with jug status primes.py):
Task name Waiting Ready Finished Running ---------------------------------------------------------------------- primes.is_prime 0 63 32 4 ...................................................................... Total: 0 63 32 4
Now you have 32 tasks finished, 4 running, and 63 still ready. Eventually, they will all finish and you can inspect the results with jug shell primes.py. This will give you an ipython shell. The primes100 variable is available, but it is an ugly list of jug.Task objects. To get the actual value, you call the value function:
In [1]: primes100 = value(primes100) In [2]: primes100[:10] Out[2]: [True, True, False, True, False, True, False, False, False, True]
Travis Build Status
What’s New
version 0.9.6 (Tue Aug 6 2013) - Faster decoding - Add jug-execute script - Add describe() function - Add write_task_out() function
version 0.9.5 (May 27 2013)
Added debug mode
Even better map.reduce.map using blocked access
Python 3 support
Documentation improvements
version 0.9.4 (Apr 15 2013)
Add CustomHash wrapper to set __jug_hash__
Print traceback on import error
Exit when no progress is made even with barrier
Use Tasklets for better jug.mapreduce.map
Use Ipython debugger if available (patch by Alex Ford)
Faster –aggressive-unload
Add currymap() function
version 0.9.3 (Dec 2 2012)
Fix parsing of ports on redis URL (patch by Alcides Viamontes)
Make hashing robust to different orders when using randomized hashing (patch by Alcides Viamontes)
Allow regex in invalidate command (patch by Alcides Viamontes)
Add --cache --clear suboption to status
Allow builtin functions for tasks
Fix status –cache`` (a general bug which seems to be triggered mainly by bvalue() usage).
Fix CompoundTask (broken by earlier __jug_hash__ hook introduction)
Make Tasklets more flexible by allowing slicing with Tasks (previously, slicing with tasks was not allowed)
version 0.9.2 (Nov 4 2012):
More flexible mapreduce()/map() functions
Make TaskGenerator pickle()able and hash()able
Add invalidate() method to Task
Add –keep-going option to execute
Better help messsage
version 0.9.1 (Jun 11 2012):
Add –locks-only option to cleanup subcommand
Make cache file (for status subcommand) configurable
Add webstatus subcommand
Add bvalue() function
Fix bug in shell subcommand (value was not in global namespace)
Improve identity()
Fix bug in using Tasklets and –aggressive-unload
Fix bug with Tasklets and sleep-until/check
version 0.9:
In the presence of a barrier(), rerun the jugfile. This makes barrier much easier to use.
Add set_jugdir to public API
Added CompoundTaskGenerator
Support subclassing of Task
Avoid creating directories in file backend unless it is necessary
Add jug.mapreduce.reduce (which mimicks the builtin reduce)
For older version see ChangeLog file.
Roadmap
Version 1.0
Version 1.0 is just around the corner. After 0.8 is done, there really are not that many features left. More flexible configuration, a bit more caching, and we are done.
After version 1.0
I want to start adding bells&whistles through extensions. Things like timing, more active monitoring, &c.
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