I have a rails application (2.3.5) running on VPS with 4 cores with a frequency of 2 GHz and 4 GB. I am running nginx (0.7.61) and passenger phusion (2.2.14) on Ruby Enterprise (1.8.7-2010.01) with a maximum pool size set to 30. My problem is that it seems that every ruby process that is being executed is requested rails runs at a speed of about 100%. If I run TOP, they go away every time the display is updated so that they do not hang themselves, but they still work 100%.
Is there any way to reduce this? Or at least figure out how much of the code the processor is diving into? Is this normal behavior?
Here is the TOP conclusion:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2427 psadmin 25 0 91904 76m 2696 R 100 1.9 739:05.96 Rails: /var/www/apps/main_rails_app/current
3457 psadmin 25 0 98180 82m 2532 R 100 2.0 711:21.91 Rails: /var/www/apps/main_rails_app/current
2415 psadmin 25 0 93952 77m 2708 R 99 1.9 727:49.31 Rails: /var/www/apps/main_rails_app/current
3455 psadmin 25 0 99204 83m 2528 R 69 2.0 726:04.70 Rails: /var/www/apps/main_rails_app/current
2791 psadmin 16 0 98044 81m 2492 S 31 2.0 0:10.16 Rails: /var/www/apps/main_rails_app/current
8034 psadmin 15 0 8160 3656 1772 S 1 0.1 0:35.39 nginx: worker process
8035 psadmin 15 0 8324 3696 1732 S 0 0.1 0:31.34 nginx: worker process
2588 psadmin 15 0 197m 183m 2712 S 0 4.5 1:02.16 Rails: /var/www/apps/main_rails_app/current
Thank!
Edit: Tried strace using the following forks as below. This is the output, which is reset again and again:
sudo strace -f -p 3455
clock_gettime(CLOCK_MONOTONIC, {394577, 508326476}) = 0
select(0, [], [], [], {0, 0}) = 0 (Timeout)
--- SIGVTALRM (Virtual timer expired) @ 0 (0) ---
sigreturn()