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tests/cgienv
author Arun Kulshreshtha <akulshreshtha@janestreet.com>
Tue, 30 Aug 2022 15:29:55 -0400
changeset 49491 c6a1beba27e9
parent 13269 aa3f726a2bdb
permissions -rw-r--r--
bisect: avoid copying ancestor list for non-merge commits During a bisection, hg needs to compute a list of all ancestors for every candidate commit. This is accomplished via a bottom-up traversal of the set of candidates, during which each revision's ancestor list is populated using the ancestor list of its parent(s). Previously, this involved copying the entire list, which could be very long in if the bisection range was large. To help improve this, we can observe that each candidate commit is visited exactly once, at which point its ancestor list is copied into its children's lists and then dropped. In the case of non-merge commits, a commit's ancestor list consists exactly of its parent's list plus itself. This means that we can trivially reuse the parent's existing list for one of its non-merge children, which avoids copying entirely if that commit is the parent's only child. This makes bisections over linear ranges of commits much faster. During some informal testing in the large publicly-available `mozilla-central` repository, this noticeably sped up bisections over large ranges of history: Setup: $ cd mozilla-central $ hg bisect --reset $ hg bisect --good 0 $ hg log -r tip -T '{rev}\n' 628417 Test: $ time hg bisect --bad tip --noupdate Before: real 3m35.927s user 3m35.553s sys 0m0.319s After: real 1m41.142s user 1m40.810s sys 0m0.285s
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DOCUMENT_ROOT="/var/www/hg"; export DOCUMENT_ROOT
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GATEWAY_INTERFACE="CGI/1.1"; export GATEWAY_INTERFACE
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HTTP_ACCEPT="text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"; export HTTP_ACCEPT
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HTTP_ACCEPT_CHARSET="ISO-8859-1,utf-8;q=0.7,*;q=0.7"; export HTTP_ACCEPT_CHARSET
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HTTP_ACCEPT_ENCODING="gzip,deflate"; export HTTP_ACCEPT_ENCODING
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HTTP_ACCEPT_LANGUAGE="en-us,en;q=0.5"; export HTTP_ACCEPT_LANGUAGE
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HTTP_CACHE_CONTROL="max-age=0"; export HTTP_CACHE_CONTROL
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HTTP_CONNECTION="keep-alive"; export HTTP_CONNECTION
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HTTP_HOST="hg.omnifarious.org"; export HTTP_HOST
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HTTP_KEEP_ALIVE="300"; export HTTP_KEEP_ALIVE
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HTTP_USER_AGENT="Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.0.4) Gecko/20060608 Ubuntu/dapper-security Firefox/1.5.0.4"; export HTTP_USER_AGENT
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PATH_INFO="/"; export PATH_INFO
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PATH_TRANSLATED="/var/www/hg/index.html"; export PATH_TRANSLATED
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QUERY_STRING=""; export QUERY_STRING
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REMOTE_ADDR="127.0.0.2"; export REMOTE_ADDR
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REMOTE_PORT="44703"; export REMOTE_PORT
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REQUEST_METHOD="GET"; export REQUEST_METHOD
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REQUEST_URI="/test/"; export REQUEST_URI
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SCRIPT_FILENAME="/home/hopper/hg_public/test.cgi"; export SCRIPT_FILENAME
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SCRIPT_NAME="/test"; export SCRIPT_NAME
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SCRIPT_URI="http://hg.omnifarious.org/test/"; export SCRIPT_URI
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SCRIPT_URL="/test/"; export SCRIPT_URL
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SERVER_ADDR="127.0.0.1"; export SERVER_ADDR
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SERVER_ADMIN="eric@localhost"; export SERVER_ADMIN
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SERVER_NAME="hg.omnifarious.org"; export SERVER_NAME
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SERVER_PORT="80"; export SERVER_PORT
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SERVER_PROTOCOL="HTTP/1.1"; export SERVER_PROTOCOL
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SERVER_SIGNATURE="<address>Apache/2.0.53 (Fedora) Server at hg.omnifarious.org Port 80</address>"; export SERVER_SIGNATURE
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SERVER_SOFTWARE="Apache/2.0.53 (Fedora)"; export SERVER_SOFTWARE
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