Hello! On Thu, Jul 12, 2018 at 05:48:55AM -0400, prajos wrote:
> Hi all, > I'm using nginx as a Revers proxy to a service (A). nginx receives a large > number of persistent connections from a single client service(B). > Service B sends a lot of requests (2K rps) over these persistent > connections. > > The amount of memory nginx uses seems to increase as a function of > 'keepalive_requests 2147483647' . The memory used keeps raising until the > machine runs out of memory (4GB, aws instance). While a smaller > ''keepalive_requests 8192' doesn't create the exact problem. > > Some additional observations: > When I reload nginx the memory usage comes down and then slowly starts > building up. > when I test nginx with a gatling test tool as a client, this behaviour is > not observed. > When I use the actual service(B), this behaviour seems to reappear. > > I curious to know what exactly is happening and how can I fix this issue of > high memory usage ? There may be allocations from a connection memory pool, and these allocations are freed only on connection close. Trying to use "keepalive_requests 2147483647" is expected to result in memory usage growth as long as connections are never closed. Tuning various settings might help to eliminate connection-related allocations. In particular, if you've already tuned some settings from their default values, switching back to defaults might be a good starting point. Though in general it is a bad idea to never close keepalive connections, the number of requests is limited for a reason. -- Maxim Dounin http://mdounin.ru/ _______________________________________________ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
