{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Simple interactive bacgkround jobs with IPython\n",
"\n",
"We start by loading the `backgroundjobs` library and defining a few trivial functions to illustrate things with."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"from IPython.lib import backgroundjobs as bg\n",
"\n",
"import sys\n",
"import time\n",
"\n",
"def sleepfunc(interval=2, *a, **kw):\n",
" args = dict(interval=interval,\n",
" args=a,\n",
" kwargs=kw)\n",
" time.sleep(interval)\n",
" return args\n",
"\n",
"def diefunc(interval=2, *a, **kw):\n",
" time.sleep(interval)\n",
" raise Exception(\"Dead job with interval %s\" % interval)\n",
"\n",
"def printfunc(interval=1, reps=5):\n",
" for n in range(reps):\n",
" time.sleep(interval)\n",
" print('In the background... %i' % n)\n",
" sys.stdout.flush()\n",
" print('All done!')\n",
" sys.stdout.flush()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Now, we can create a job manager (called simply `jobs`) and use it to submit new jobs.\n",
"\n",
"Run the cell below, it will show when the jobs start. Wait a few seconds until you see the 'all done' completion message:"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Starting job # 0 in a separate thread.\n",
"Starting job # 2 in a separate thread.\n",
"Starting job # 3 in a separate thread.\n"
]
},
{
"data": {
"text/plain": [
"<BackgroundJob #3: printfunc(1,3)>"
]
},
"execution_count": 2,
"metadata": {},
"output_type": "execute_result"
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"In the background... 0\n",
"In the background... 1\n",
"In the background... 2\n",
"All done!\n"
]
}
],
"source": [
"jobs = bg.BackgroundJobManager()\n",
"\n",
"# Start a few jobs, the first one will have ID # 0\n",
"jobs.new(sleepfunc, 4)\n",
"jobs.new(sleepfunc, kw={'reps':2})\n",
"jobs.new('printfunc(1,3)')"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"You can check the status of your jobs at any time:"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Completed jobs:\n",
"0 : <function sleepfunc at 0x10521f2f0>\n",
"2 : <function sleepfunc at 0x10521f2f0>\n",
"3 : printfunc(1,3)\n",
"\n"
]
}
],
"source": [
"jobs.status()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"For any completed job, you can get its result easily:"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/plain": [
"{'args': (), 'interval': 4, 'kwargs': {}}"
]
},
"execution_count": 4,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"jobs[0].result"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Errors and tracebacks"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"The jobs manager tries to help you with debugging:"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Starting job # 4 in a separate thread.\n",
"Starting job # 5 in a separate thread.\n"
]
}
],
"source": [
"# This makes a couple of jobs which will die. Let's keep a reference to\n",
"# them for easier traceback reporting later\n",
"diejob1 = jobs.new(diefunc, 1)\n",
"diejob2 = jobs.new(diefunc, 2)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"You can get the traceback of any dead job. Run the line\n",
"below again interactively until it prints a traceback (check the status\n",
"of the job):\n"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Status of diejob1: Dead (Exception), call jobs.traceback() for details\n",
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n",
"\u001b[1;31mException\u001b[0m Traceback (most recent call last)\n",
"\u001b[1;32m/Users/minrk/dev/ip/mine/IPython/lib/backgroundjobs.py\u001b[0m in \u001b[0;36mcall\u001b[1;34m(self)\u001b[0m\n",
"\u001b[0;32m 489\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 490\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mcall\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m--> 491\u001b[1;33m \u001b[1;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mfunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m*\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0margs\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m**\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0m\n",
"\u001b[1;32m<ipython-input-1-169e49434ce0>\u001b[0m in \u001b[0;36mdiefunc\u001b[1;34m(interval, *a, **kw)\u001b[0m\n",
"\u001b[0;32m 13\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mdiefunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m*\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m**\u001b[0m\u001b[0mkw\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 14\u001b[0m \u001b[0mtime\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0msleep\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m---> 15\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mException\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Dead job with interval %s\"\u001b[0m \u001b[1;33m%\u001b[0m \u001b[0minterval\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0m\u001b[0;32m 16\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 17\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mprintfunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mreps\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m5\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\n",
"\u001b[1;31mException\u001b[0m: Dead job with interval 1\n"
]
}
],
"source": [
"print(\"Status of diejob1: %s\" % diejob1.status)\n",
"diejob1.traceback() # jobs.traceback(4) would also work here, with the job number"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"This will print all tracebacks for all dead jobs:"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Traceback for: <BackgroundJob #4: <function diefunc at 0x10521f7b8>>\n",
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n",
"\u001b[1;31mException\u001b[0m Traceback (most recent call last)\n",
"\u001b[1;32m/Users/minrk/dev/ip/mine/IPython/lib/backgroundjobs.py\u001b[0m in \u001b[0;36mcall\u001b[1;34m(self)\u001b[0m\n",
"\u001b[0;32m 489\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 490\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mcall\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m--> 491\u001b[1;33m \u001b[1;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mfunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m*\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0margs\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m**\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0m\n",
"\u001b[1;32m<ipython-input-1-169e49434ce0>\u001b[0m in \u001b[0;36mdiefunc\u001b[1;34m(interval, *a, **kw)\u001b[0m\n",
"\u001b[0;32m 13\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mdiefunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m*\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m**\u001b[0m\u001b[0mkw\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 14\u001b[0m \u001b[0mtime\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0msleep\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m---> 15\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mException\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Dead job with interval %s\"\u001b[0m \u001b[1;33m%\u001b[0m \u001b[0minterval\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0m\u001b[0;32m 16\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 17\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mprintfunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mreps\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m5\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\n",
"\u001b[1;31mException\u001b[0m: Dead job with interval 1\n",
"\n",
"Traceback for: <BackgroundJob #5: <function diefunc at 0x10521f7b8>>\n",
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n",
"\u001b[1;31mException\u001b[0m Traceback (most recent call last)\n",
"\u001b[1;32m/Users/minrk/dev/ip/mine/IPython/lib/backgroundjobs.py\u001b[0m in \u001b[0;36mcall\u001b[1;34m(self)\u001b[0m\n",
"\u001b[0;32m 489\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 490\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mcall\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m--> 491\u001b[1;33m \u001b[1;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mfunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m*\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0margs\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m**\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0m\n",
"\u001b[1;32m<ipython-input-1-169e49434ce0>\u001b[0m in \u001b[0;36mdiefunc\u001b[1;34m(interval, *a, **kw)\u001b[0m\n",
"\u001b[0;32m 13\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mdiefunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m*\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;33m**\u001b[0m\u001b[0mkw\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 14\u001b[0m \u001b[0mtime\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0msleep\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m---> 15\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mException\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Dead job with interval %s\"\u001b[0m \u001b[1;33m%\u001b[0m \u001b[0minterval\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0m\u001b[0;32m 16\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[0;32m 17\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mprintfunc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minterval\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mreps\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m5\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\n",
"\u001b[1;31mException\u001b[0m: Dead job with interval 2\n",
"\n"
]
}
],
"source": [
"jobs.traceback()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"The job manager can be flushed of all completed jobs at any time:"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Flushing 3 Completed jobs.\n",
"Flushing 2 Dead jobs.\n"
]
}
],
"source": [
"jobs.flush()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"After that, the status is simply empty:"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"jobs.status()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Jobs have a `.join` method that lets you wait on their thread for completion:"
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Starting job # 0 in a separate thread.\n"
]
}
],
"source": [
"j = jobs.new(sleepfunc, 2)\n",
"j.join?"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Exercise\n",
"\n",
"1. Start a new job that calls `sleepfunc` with a 5-second wait\n",
"2. Print a short message that indicates you are waiting (note: you'll need to flush stdout to see that print output appear).\n",
"3. Wait on the job and then print its result."
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.4.2"
}
},
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"nbformat_minor": 0
}
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
ecc026b61096e2959ba01e3826059e7c
>
files
>
12
