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Uwsgi_response_write_body_do () TIMEOUT - but uwsgi_read_timeout does not help (x-post)

I keep getting this error when interacting with Nginx:

uwsgi_response_write_body_do() TIMEOUT !!! IOError: write error

It generally works fine. This only happens when I test 50+ concurrent connections striking by a method that sends 200 MB of data.

I searched everything, but everything I see advises increasing uwsgi_read_timeout: - (

(I asked on the uwsgi github page, but I think, since this is probably not a mistake, which is better to ask here)

This is how I run uwsgi:

 flask/bin/uwsgi -s 127.0.0.1:9001 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_01.log flask/bin/uwsgi -s 127.0.0.1:9002 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_02.log flask/bin/uwsgi -s 127.0.0.1:9003 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_03.log flask/bin/uwsgi -s 127.0.0.1:9004 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_04.log flask/bin/uwsgi -s 127.0.0.1:9005 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_05.log flask/bin/uwsgi -s 127.0.0.1:9006 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_06.log flask/bin/uwsgi -s 127.0.0.1:9007 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_07.log flask/bin/uwsgi -s 127.0.0.1:9008 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_08.log flask/bin/uwsgi -s 127.0.0.1:9009 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_09.log flask/bin/uwsgi -s 127.0.0.1:9010 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_10.log flask/bin/uwsgi -s 127.0.0.1:9011 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_11.log flask/bin/uwsgi -s 127.0.0.1:9012 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_12.log flask/bin/uwsgi -s 127.0.0.1:9013 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_13.log flask/bin/uwsgi -s 127.0.0.1:9014 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_14.log flask/bin/uwsgi -s 127.0.0.1:9015 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_15.log flask/bin/uwsgi -s 127.0.0.1:9016 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_16.log flask/bin/uwsgi -s 127.0.0.1:9017 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_17.log flask/bin/uwsgi -s 127.0.0.1:9018 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_18.log flask/bin/uwsgi -s 127.0.0.1:9019 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_19.log flask/bin/uwsgi -s 127.0.0.1:9020 --need-app --wsgi-file app.py --processes 1 --callable app --daemonize /opt/logs/KVAutobus-uwsgi_20.log

Here is / etc / nginx / nginx.conf:

 user nginx; worker_processes 10; error_log /var/log/nginx/error.log warn; pid /var/run/nginx.pid; events { worker_connections 2024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; sendfile on; #tcp_nopush on; keepalive_timeout 20; gzip on; include /etc/nginx/conf.d/*.conf; }

Here is / etc / nginx / conf.d / default.conf:

 upstream internal { least_conn; server 127.0.0.1:9001; server 127.0.0.1:9002; server 127.0.0.1:9003; server 127.0.0.1:9004; server 127.0.0.1:9005; server 127.0.0.1:9006; server 127.0.0.1:9007; server 127.0.0.1:9008; server 127.0.0.1:9009; server 127.0.0.1:9010; server 127.0.0.1:9011; server 127.0.0.1:9012; server 127.0.0.1:9013; server 127.0.0.1:9014; server 127.0.0.1:9015; server 127.0.0.1:9016; server 127.0.0.1:9017; server 127.0.0.1:9018; server 127.0.0.1:9019; server 127.0.0.1:9020; } server { listen 9000 default_server; server_name _; proxy_max_temp_file_size 4024m; #access_log logs/host.access.log main; location / { uwsgi_pass internal; uwsgi_param Host $host; uwsgi_param X-Real-IP $remote_addr; uwsgi_param X-Forwarded-For $proxy_add_x_forwarded_for; uwsgi_param X-Forwarded-Proto $http_x_forwarded_proto; #not sure which timeout parameter I need proxy_read_timeout 600; proxy_connect_timeout 1d; proxy_max_temp_file_size 5024m; proxy_send_timeout 600; uwsgi_read_timeout 600; uwsgi_send_timeout 600; include uwsgi_params; } }
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Just use the directive:

 uwsgi_max_temp_file_size 0;

or

 uwsgi_buffering off;

to disable the buffer in Nginx.

I think the transfer speed from nginx to the client is much slower to the speed from uwsgi to nginx. And the nginx buffer is full, so uwsgi waits a long time before there is room for nginx to receive new data, and this will make the request timeout for uwsgi.

You can read my analysis of this problem on your blog: http://kmiku7.imtqy.com/2018/02/02/Solve-the-problem-of-uwsgi-uwsgi-response-write-body-do-TIMEOUT-error /

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