uwsgi.ini

# vim: set syntax=dosini ts=4 sw=4 et:

[uwsgi]
master = true
lazy-apps = true
thunder-lock = true
manage-script-name = true

# ** USER-PROVIDED **

# Graphite Stats Collection
# To collect statistics for an application the SERVICE and ENV
# variables below must be defined.
# Stats will be reported in the format:
#   uwsgi.<hostname>.<NYPR_UWSGI_SERVICE>-<ENV>.*
set-ph = graphite-host=graphite.nypr.digital:2003

if-env = ENV
carbon = %(graphite-host)
carbon-id = $(SERVICE).$(ENV)
carbon-hostname-dots = _
carbon-resolve-names = true
carbon-use-metrics = true
enable-metrics = true
memory-report = true
endif =

# Processes defines the maximum number of workers a single uWSGI application
# can spawn. A safe value can be estimated using the following formula:
#   ⌊(total_mem) / (avg_rss_per_worker)⌋
# Override this value by setting UWSGI_PROCESSES.
processes = 4

# The minimum number of workers is defined by <cheaper>.
# The number of starting workers is defined by <initial>.
# Scaling operations will increment the number of workers by <step>.
# Override these values by setting UWSGI_CHEAPER(|-initial|-step).
cheaper = 1
cheaper-initial = 2
cheaper-step = 1


# These are required for newrelic
# and to avoid issues with third party C libraries.
single-interpreter = true
enable-threads = true

# When clients disconnect early 'junk' exceptions
# are reported to sentry. These three directives will
# reduce the noise.
ignore-sigpipe = true
ignore-write-errors = true
disable-write-exception = true


if-env = VIRTUAL_ENV
home = %(_)
endif =

http = :8080
set-ph = socket-dir=/tmp
stats = %(socket-dir)/%N_stats.sock

chmod-socket = 664
vacuum = true

# Workers will be reloaded after 5000 requests served
# to avoid complications due to memory leaks.
max-requests = 5000

# Workers will be restarted if they do not respond within 5 minutes
# to avoid worker pool reduction due to unsafe IO (no timeout).
harakiri = 300

## uWSGI Auto Scaling
# The busyness algorithm requires the cheaper_busyness plugin.
# Busyness is a smoother scaling algorithm than the built-ins.
cheaper-algo = busyness
cheaper-busyness-verbose = false

## Scaling Based On Worker Busyness
# Busyness is calculated every 30 seconds.
# If a worker's busyness is under the <busyness-min> for <busyness-multiplier>
# consecutive checks <overload> seconds apart it will be retired.
# If a worker's busyness is over the <busyness-max> for <busyness-multiplier>
# consecutive checks <overload> seconds apart it will be retired.
cheaper-overload = 30
cheaper-busyness-multiplier = 10
cheaper-busyness-min = 20
cheaper-busyness-max = 65

# The <busyness-penalty> is an additional number of seconds to append to
# the <busyness-multiplier> value, increasing the time between scaling events
# to allow the new workers to try to balance the workload.
cheaper-busyness-penalty = 2


## Scaling Based On Backlog Length
# Scaling based on the queue "backlog" addresses spikes in traffic without
# the need to wait for the long cheaper-overload cycles to complete.

# When the backlog is greater than <busyness-backlog-alert> for
# <busyness-backlog-multiplier> consecutive checks <busyness-backlog-step>
# workers will be spawned. Checks occur every 1s.
# The <busyness-backlog-nonzero> directive handles cases where a single worker
# may be stuck handling a long request. If the worker is held-up for the
# specified duration an additional worker will be spawned.
cheaper-busyness-backlog-alert = 33
cheaper-busyness-backlog-multiplier = 3
cheaper-busyness-backlog-step = 1
cheaper-busyness-backlog-nonzero = 60


## Logging
threaded-logger = true
# The healthcheck logger discards healthcheck requests from Amazon ELBs
# and Varnish.
logger = healthcheck file:/dev/null
log-req-route = healthcheck ELB-HealthChecker/\d.\d
log-req-route = healthcheck varnish-probe
# Uses the real client ip, not the load balancer's.
log-x-forwarded-for = true
# The timestamp is written in a Logstash-consumable format to avoid further
# parsing.
log-format = timestamp:${strftime:%%Y-%%m-%%dT%%T%%z}|vhost:%(host)|clientip:%(addr)|user:%(user)|verb:%(method)|request:%(uri)|protocol:%(proto)|status:%(status)|size:%(size)|referrer:"%(referer)"|agent:"%(uagent)"|duration:%(micros)|rss:%(rssM)|worker:%(wid)|pid:%(pid)