As a little review of the last days things have kept going smooth except about half an hour this afternoon. Haven’t been at the server myself at that time but we had Timeouts from the Backend reported in nginx log. sar shows a slightly higher sys utliization but no general high cpu load. Not sure what that was but it seemingly kept unicorn/redis/postgres from working smoothly.
03:55:01 PM all 34.99 1.87 6.67 0.12 0.00 56.35
04:05:01 PM all 33.99 0.35 6.52 0.31 0.00 58.82
04:15:01 PM all 35.24 1.17 7.14 0.13 0.00 56.31
04:25:02 PM all 36.45 0.63 7.15 0.13 0.00 55.65
> 04:35:01 PM all 39.09 0.71 16.78 0.11 0.00 43.32
> 04:45:01 PM all 35.53 0.95 20.16 0.08 0.00 43.27
> 04:55:01 PM all 41.64 4.29 15.44 0.24 0.00 38.39
05:05:01 PM all 36.75 2.47 7.78 0.13 0.00 52.87
05:15:01 PM all 35.96 1.29 7.81 0.10 0.00 54.85
05:25:01 PM all 38.69 1.35 8.00 0.09 0.00 51.87
05:35:01 PM all 37.01 4.53 7.92 0.07 0.00 50.46
It’s the > marked lines.
Can’t see any high traffic at that time so I’m kind of clueless what it was but it really was only happening in that half hour.
Overall when looking at cpu time, Redis has taken the lead and generally uses a good part of the CPU. Not sure if there’s anything that can be done about it. It’s usually at around 20-25% peaking to 35% here and there.
1721566 uuidd 20 0 2035M 1458M 1952 S 16.1 4.6 16h22:37 /usr/bin/redis-server *:6379
1721578 www-data 20 0 108M 69100 12516 S 6.7 0.2 6h32:27 nginx: worker process
2853756 1000 20 0 1355M 444M 19356 R 63.7 1.4 2h38:10 unicorn worker[0] -E production -c config/unicorn.conf.rb
2854380 1000 20 0 1267M 409M 18768 S 41.6 1.3 2h19:45 unicorn worker[4] -E production -c config/unicorn.conf.rb
1721598 1000 20 0 592M 285M 5192 S 1.3 0.9 2h08:53 unicorn master -E production -c config/unicorn.conf.rb
575 root 20 0 1747M 20468 5040 S 0.7 0.1 2h01:02 /usr/bin/containerd
2854731 1000 20 0 1280M 399M 17880 S 36.9 1.3 1h57:52 unicorn worker[7] -E production -c config/unicorn.conf.rb
1721841 1000 20 0 592M 285M 5192 S 0.7 0.9 1h49:49 unicorn master -E production -c config/unicorn.conf.rb
2855284 1000 20 0 1287M 425M 18396 S 18.8 1.4 1h35:02 unicorn worker[3] -E production -c config/unicorn.conf.rb
2856414 1000 20 0 1223M 391M 19268 S 13.4 1.2 1h14:50 unicorn worker[2] -E production -c config/unicorn.conf.rb
2856478 1000 20 0 1207M 401M 21120 S 5.4 1.3 58:42.50 unicorn worker[5] -E production -c config/unicorn.conf.rb
2856503 1000 20 0 1215M 389M 18980 S 4.7 1.2 47:22.95 unicorn worker[1] -E production -c config/unicorn.conf.rb
1721581 www-data 20 0 69888 28636 13368 S 0.0 0.1 44:49.50 nginx: worker process
2857467 1000 20 0 1199M 385M 18112 S 4.0 1.2 39:23.87 unicorn worker[6] -E production -c config/unicorn.conf.rb
1721594 _apt 20 0 8479M 20036 18128 S 1.3 0.1 32:55.29 postgres: 13/main: walwriter
580 root 20 0 1747M 20468 5040 S 0.0 0.1 32:15.27 /usr/bin/containerd
Load overall averaging at 5 long term now but I still see it going up to 8 or 9 from time to time.