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| | # Run GC after every request, before attempting to accept more connections.
#
# You could customize this patch to read REQ["PATH_INFO"] and only
# call GC.start after expensive requests.
#
# We could have this wrap the response body.close as middleware, but the
# scannable stack is would still be bigger than it would be here.
#
# This shouldn't hurt overall performance as long as the server cluster
# is at <=50% CPU capacity, and improves the performance of most memory
# intensive requests. This serves to improve _client-visible_
# performance (possibly at the cost of overall performance).
#
# We'll call GC after each request is been written out to the socket, so
# the client never sees the extra GC hit it. It's ideal to call the GC
# inside the HTTP server (vs middleware or hooks) since the stack is
# smaller at this point, so the GC will both be faster and more
# effective at releasing unused memory.
#
# This monkey patch is _only_ effective for applications that use a lot
# of memory, and will hurt simpler apps/endpoints that can process
# multiple requests before incurring GC.
class Unicorn::HttpServer
REQ = Unicorn::HttpRequest::REQ
alias _process_client process_client
undef_method :process_client
def process_client(client)
_process_client(client)
REQ.clear
GC.start
end
end if defined?(Unicorn)
|