Mercurial > hg
annotate contrib/debugcmdserver.py @ 30706:2e4862646f02
repair: speed up stripping of many roots
repair.strip() expects a set of root revisions to strip. It then
builds the full set of descedants by walking the descandants of
each. It is rare that more than a few roots get passed in, but if that
happens, it will wastefully walk the changelog for each root. So let's
just walk it once.
I noticed this because the narrowhg extension was passing not only
roots, but all the commits to strip. When there were tens of thousands
of commits to strip, this resulted in quadratic behavior with that
extension.
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 04 Jan 2017 10:07:12 -0800 |
parents | cd03fbd5ab57 |
children | 2372284d9457 |
rev | line source |
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1 #!/usr/bin/env python |
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2 # |
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3 # Dumps output generated by Mercurial's command server in a formatted style to a |
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4 # given file or stderr if '-' is specified. Output is also written in its raw |
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5 # format to stdout. |
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6 # |
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7 # $ ./hg serve --cmds pipe | ./contrib/debugcmdserver.py - |
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8 # o, 52 -> 'capabilities: getencoding runcommand\nencoding: UTF-8' |
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9 |
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10 from __future__ import absolute_import, print_function |
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11 import struct |
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12 import sys |
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13 |
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14 if len(sys.argv) != 2: |
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15 print('usage: debugcmdserver.py FILE') |
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16 sys.exit(1) |
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17 |
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18 outputfmt = '>cI' |
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19 outputfmtsize = struct.calcsize(outputfmt) |
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20 |
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21 if sys.argv[1] == '-': |
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22 log = sys.stderr |
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23 else: |
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24 log = open(sys.argv[1], 'a') |
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25 |
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26 def read(size): |
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27 data = sys.stdin.read(size) |
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28 if not data: |
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29 raise EOFError |
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30 sys.stdout.write(data) |
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31 sys.stdout.flush() |
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32 return data |
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33 |
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34 try: |
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35 while True: |
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36 header = read(outputfmtsize) |
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37 channel, length = struct.unpack(outputfmt, header) |
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38 log.write('%s, %-4d' % (channel, length)) |
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39 if channel in 'IL': |
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40 log.write(' -> waiting for input\n') |
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41 else: |
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42 data = read(length) |
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43 log.write(' -> %r\n' % data) |
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44 log.flush() |
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45 except EOFError: |
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46 pass |
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47 finally: |
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48 if log != sys.stderr: |
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49 log.close() |