防止 Gunicorn 在闲置一段时间后加载缓慢？

Question

我的 Django 项目正在运行gunicorn。有时加载页面（以及相关的 oracle 过程调用）需要很长时间。这种情况在服务器保持不活跃对于一些分钟。

我该如何解决这个问题？

wsgi.py

import os
import site
import sys

from whitenoise.django import DjangoWhiteNoise

# Add the site-packages of the chosen virtualenv to work with
site.addsitedir('/new_esmart/esmart_env/lib/python2.7/site-packages')

# Add the app's directory to the PYTHONPATH
sys.path.append('/new_esmart/esmart2')
sys.path.append('/new_esmart/esmart2/esmart2')
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "esmart2.settings")

# Activate your virtual env
activate_env = os.path.expanduser("/new_esmart/esmart_env/bin/activate_this.py")
execfile(activate_env, dict(__file__=activate_env))

from django.core.wsgi import get_wsgi_application
application = get_wsgi_application()
application = DjangoWhiteNoise(application)

统计数据

             total       used       free     shared    buffers     cached
Mem:          3962       3727        234          0        394       2268
-/+ buffers/cache:       1064       2897
Swap:         4095          0       4095

机器

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    1
Core(s) per socket:    2
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Stepping:              7
CPU MHz:               1995.000
BogoMIPS:              3990.00
Hypervisor vendor:     VMware
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0,1