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tillahoffmann/cython_line_profiler.ipynb

Created February 3, 2015 14:48
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Demonstration of line-by-line profiling for `cython` functions.
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cython_line_profiler.ipynb
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"cell_type": "markdown",
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"source": [
"This notebook demonstrates the use of Robert Kern's `line_profiler` (https://github.com/rkern/line_profiler) to profile `cython` functions line by line. Thanks to Robert Bradshaw for implementing this feature (https://groups.google.com/forum/#!topic/cython-users/FH3TYK8BkeA)."
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"input": [
"#Load Robert Kern's line profiler\n",
"%load_ext line_profiler\n",
"import line_profiler"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 1
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"cell_type": "code",
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"input": [
"#Set compiler directives (cf. http://docs.cython.org/src/reference/compilation.html)\n",
"from Cython.Compiler.Options import directive_defaults\n",
"\n",
"directive_defaults['linetrace'] = True\n",
"directive_defaults['binding'] = True"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 2
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"input": [
"%%cython -a -f --compile-args=-DCYTHON_TRACE=1\n",
"#We need to define the macro CYTHON_TRACE=1 (cf. http://docs.cython.org/src/reference/compilation.html)\n",
"\n",
"def cumulative_sum(int n):\n",
" cdef int s=0, i\n",
" for i in range(n):\n",
" s += i\n",
" \n",
" return s"
],
"language": "python",
"metadata": {},
"outputs": [
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"<!-- Generated by Cython 0.22.beta0 -->\n",
"<html>\n",
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"input": [
"#Print profiling statistics using the `line_profiler` API\n",
"profile = line_profiler.LineProfiler(cumulative_sum)\n",
"profile.runcall(cumulative_sum, 100)\n",
"profile.print_stats()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Timer unit: 1e-06 s\n",
"\n",
"Total time: 4.9e-05 s\n",
"File: /Users/tillhoffmann/.ipython/cython/_cython_magic_67a1c782057df134c860e5ee2814a620.pyx\n",
"Function: cumulative_sum at line 3\n",
"\n",
"Line # Hits Time Per Hit % Time Line Contents\n",
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" 3 def cumulative_sum(int n):\n",
" 4 1 9 9.0 18.4 cdef int s=0, i\n",
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{
"cell_type": "code",
"collapsed": false,
"input": [
"#Print profiling statistics using the `lprun` magic\n",
"%lprun -f cumulative_sum cumulative_sum(100)"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 5
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"metadata": {}
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