view auto/summary @ 7281:bd6563e81cea

Limit req: improved handling of negative times. Negative times can appear since workers only update time on an event loop iteration start. If a worker was blocked for a long time during an event loop iteration, it is possible that another worker already updated the time stored in the node. As such, time since last update of the node (ms) will be negative. Previous code used ngx_abs(ms) in the calculations. That is, negative times were effectively treated as positive ones. As a result, it was not possible to maintain high request rates, where the same node can be updated multiple times from during an event loop iteration. In particular, this affected setups with many SSL handshakes, see http://mailman.nginx.org/pipermail/nginx/2018-May/056291.html. Fix is to only update the last update time stored in the node if the new time is larger than previously stored one. If a future time is stored in the node, we preserve this time as is. To prevent breaking things on platforms without monotonic time available if system time is updated backwards, a safety limit of 60 seconds is used. If the time stored in the node is more than 60 seconds in the future, we assume that the time was changed backwards and update lr->last to the current time.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 30 May 2018 15:40:34 +0300
parents 9eefb38f0005
children 0b5f12d5c531
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo
echo "Configuration summary"


if [ $USE_THREADS = YES ]; then
    echo "  + using threads"
fi

if [ $USE_PCRE = DISABLED ]; then
    echo "  + PCRE library is disabled"

else
    case $PCRE in
        YES)   echo "  + using system PCRE library" ;;
        NONE)  echo "  + PCRE library is not used" ;;
        *)     echo "  + using PCRE library: $PCRE" ;;
    esac
fi

case $OPENSSL in
    YES)   echo "  + using system OpenSSL library" ;;
    NONE)  echo "  + OpenSSL library is not used" ;;
    *)     echo "  + using OpenSSL library: $OPENSSL" ;;
esac

case $ZLIB in
    YES)   echo "  + using system zlib library" ;;
    NONE)  echo "  + zlib library is not used" ;;
    *)     echo "  + using zlib library: $ZLIB" ;;
esac

case $NGX_LIBATOMIC in
    YES)   echo "  + using system libatomic_ops library" ;;
    NO)    ;; # not used
    *)     echo "  + using libatomic_ops library: $NGX_LIBATOMIC" ;;
esac

echo


cat << END
  nginx path prefix: "$NGX_PREFIX"
  nginx binary file: "$NGX_SBIN_PATH"
  nginx modules path: "$NGX_MODULES_PATH"
  nginx configuration prefix: "$NGX_CONF_PREFIX"
  nginx configuration file: "$NGX_CONF_PATH"
  nginx pid file: "$NGX_PID_PATH"
END

if test -n "$NGX_ERROR_LOG_PATH"; then
    echo "  nginx error log file: \"$NGX_ERROR_LOG_PATH\""
else
    echo "  nginx logs errors to stderr"
fi

cat << END
  nginx http access log file: "$NGX_HTTP_LOG_PATH"
  nginx http client request body temporary files: "$NGX_HTTP_CLIENT_TEMP_PATH"
END

if [ $HTTP_PROXY = YES ]; then
    echo "  nginx http proxy temporary files: \"$NGX_HTTP_PROXY_TEMP_PATH\""
fi

if [ $HTTP_FASTCGI = YES ]; then
    echo "  nginx http fastcgi temporary files: \"$NGX_HTTP_FASTCGI_TEMP_PATH\""
fi

if [ $HTTP_UWSGI = YES ]; then
    echo "  nginx http uwsgi temporary files: \"$NGX_HTTP_UWSGI_TEMP_PATH\""
fi

if [ $HTTP_SCGI = YES ]; then
    echo "  nginx http scgi temporary files: \"$NGX_HTTP_SCGI_TEMP_PATH\""
fi

echo "$NGX_POST_CONF_MSG"