92 lines
2.6 KiB
Python
92 lines
2.6 KiB
Python
#!/usr/bin/env python3
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"""
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performance-log-deduce.py -- Deduce PIKA performance log thread state
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Copyright (C) 2018 Ell
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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Usage: performance-log-deduce.py < infile > outfile
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"""
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DEDUCE_MIN_N_OCCURRENCES = 10
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DEDUCE_MIN_PERCENTAGE = 0.75
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from xml.etree import ElementTree
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import sys
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empty_element = ElementTree.Element ("")
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# Read performance log from STDIN
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log = ElementTree.fromstring (sys.stdin.buffer.read ())
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# Construct state histogram
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address_states = {}
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for sample in (log.find ("samples") or empty_element).iterfind ("sample"):
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threads = (sample.find ("backtrace") or empty_element).iterfind ("thread")
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for thread in threads:
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running = int (thread.get ("running"))
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frame = thread.find ("frame")
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if frame is not None:
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address = frame.get ("address")
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states = address_states.setdefault (address, [0, 0])
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states[running] += 1
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# Find maximal states
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for address, states in list (address_states.items ()):
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n = sum (states)
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if n >= DEDUCE_MIN_N_OCCURRENCES:
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state = 0
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m = states[0]
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for i in range (1, len (states)):
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if states[i] > m:
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state = i
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m = states[i]
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percentage = m / n
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if percentage >= DEDUCE_MIN_PERCENTAGE:
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address_states[address] = state
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else:
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del address_states[address]
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else:
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del address_states[address]
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# Replace thread states
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for sample in (log.find ("samples") or empty_element).iterfind ("sample"):
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threads = (sample.find ("backtrace") or empty_element).iterfind ("thread")
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for thread in threads:
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frame = thread.find ("frame")
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if frame is not None:
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address = frame.get ("address")
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running = address_states.get (address, None)
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if running is not None:
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thread.set ("running", str (running))
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# Write performance log to STDOUT
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sys.stdout.buffer.write (ElementTree.tostring (log))
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