view auto/cc/owc @ 4207:4fc91bae6f83

Better recheck of dead upstream servers. Previously nginx used to mark backend again as live as soon as fail_timeout passes (10s by default) since last failure. On the other hand, detecting dead backend takes up to 60s (proxy_connect_timeout) in typical situation "backend is down and doesn't respond to any packets". This resulted in suboptimal behaviour in the above situation (up to 23% of requests were directed to dead backend with default settings). More detailed description of the problem may be found here (in Russian): http://mailman.nginx.org/pipermail/nginx-ru/2011-August/042172.html Fix is to only allow one request after fail_timeout passes, and mark backend as "live" only if this request succeeds. Note that with new code backend will not be marked "live" unless "check" request is completed, and this may take a while in some specific workloads (e.g. streaming). This is believed to be acceptable.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 12 Oct 2011 14:22:48 +0000
parents cb7739c822c6
children d620f497c50f
line wrap: on
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# Copyright (C) Igor Sysoev


# Open Watcom C 1.0, 1.2, 1.3

# optimizations

# maximize speed
CFLAGS="$CFLAGS -ot"
# reorder instructions for best pipeline usage
CFLAGS="$CFLAGS -op"
# inline intrinsic functions
CFLAGS="$CFLAGS -oi"
# inline expansion
CFLAGS="$CFLAGS -oe"
# disable stack checking calls
CFLAGS="$CFLAGS -s"

case $CPU in
    pentium)
        # optimize for Pentium and Athlon
        # register-based arguments passing conventions
        CPU_OPT="-5r"
        # stack-based arguments passing conventions
        #CPU_OPT="-5s"
    ;;

    pentiumpro)
        # optimize for Pentium Pro, Pentium II and Pentium III
        # register-based arguments passing conventions
        CPU_OPT="-6r"
        # stack-based arguments passing conventions
        #CPU_OPT="-6s"
    ;;
esac

CFLAGS="$CFLAGS $CPU_OPT"


# warnings

# maximum level
CFLAGS="$CFLAGS -wx"
#CFLAGS="$CFLAGS -w3"

# stop on warning
CFLAGS="$CFLAGS -we"

# built target is NT
CFLAGS="$CFLAGS -bt=nt"

# multithreaded
CFLAGS="$CFLAGS -bm"

# debug
CFLAGS="$CFLAGS -d2"

# quiet
CFLAGS="$CFLAGS -zq"

# Open Watcom C 1.2
have=NGX_HAVE_C99_VARIADIC_MACROS . auto/have


# the precompiled headers
CORE_DEPS="$CORE_DEPS $NGX_OBJS/ngx_config.pch"
NGX_PCH="$NGX_OBJS/ngx_config.pch"
NGX_BUILD_PCH="-fhq=$NGX_OBJS/ngx_config.pch"
NGX_USE_PCH="-fh=$NGX_OBJS/ngx_config.pch"


# the link flags, built target is NT GUI mode application
#CORE_LINK="$CORE_LINK -l=nt_win"


# the resource file
NGX_RCC="wrc \$(CORE_INCS) -fo=$NGX_OBJS/nginx.res "
NGX_RCC="$NGX_RCC $NGX_WIN32_RC $NGX_OBJS/nginx.exe"


ngx_include_opt="-i="
ngx_objout="-fo"
ngx_binout="-fe="
ngx_objext="obj"
ngx_binext=".exe"

ngx_regex_dirsep='\\'
ngx_dirsep="\\"

ngx_long_start=' '
ngx_long_end=' '
ngx_long_regex_cont=' \&\
	'
ngx_long_cont=' &
	'

ngx_regex_cont=' \&\
	'
ngx_cont=' &
	'
ngx_tab=' &
		'