如何在服务器运行时通过 diff 请求访问只读数据（apache、mod_python）
我正在使用 Apache/2.2.8 (Ubuntu) mod_python/3.3.1 Python/2.5.2，我想预加载我使用的数据。
目前，每次收到请求时，我都会从磁盘上的文件中读取数据，然后解析它并将其存储在对象中。数据文件相对较大，我想提前解析/预加载它。
我想我可以1）在apache启动时将数据加载到内存中（服务器运行时大约100MB到500MB的数据将驻留在内存中）或者我可以2）在提交第一个数据请求时加载它并保留它在内存中，直到我关闭服务器。
下面是第二个想法的模型：
from mod_python import apache
from mod_python import Session
gvar = 0
def handler(req):
req.content_type = 'text/plain'
session = Session.Session(req)
if session.is_new():
global gvar
req.write('gvar was originally : '+str(gvar))
gvar = 314
session['addr'] = req.connection.remote_ip
session.save()
req.write('\ngvar was just set to: '+str(gvar))
else:
global gvar
req.write('gvar set to: '+str(gvar))
return apache.OK
输出（会话一）：
gvar 最初是：0
gvar 刚刚设置为：314
输出（会话 > 1）：
gvar 设置为：314
请分享您的意见和解决方案， 谢谢
I am using Apache/2.2.8 (Ubuntu) mod_python/3.3.1 Python/2.5.2 and I would like to preload the data I work with.
Currently I read the data from a file on disk every time I get a request, then parse it and store it in an object. The data file is relatively large and I would like to parse/preload it ahead of time.
I was thinking I could either 1) load the data in memory when apache starts (~100MB to 500MB of data would reside in memory while the server is running) or I could 2) load it when the first data request is submitted and keep it in memory until I shut the server down.
below is the mock up of the second idea:
from mod_python import apache
from mod_python import Session
gvar = 0
def handler(req):
req.content_type = 'text/plain'
session = Session.Session(req)
if session.is_new():
global gvar
req.write('gvar was originally : '+str(gvar))
gvar = 314
session['addr'] = req.connection.remote_ip
session.save()
req.write('\ngvar was just set to: '+str(gvar))
else:
global gvar
req.write('gvar set to: '+str(gvar))
return apache.OK
output (session one):
gvar was originally : 0
gvar was just set to: 314
output (session > 1):
gvar set to: 314
Please share your comments and solutions,
thx
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您可以使用数据设置 tmpfs（或 ramfs）挂载，它将保留在 RAM 中（tmpfs 可能会将数据发送到交换区）。
You could set a tmpfs (or ramfs) mount with the data and it will stay in RAM (tmpfs may send data to swap).
您没有说明数据的形式，但如果密钥库就足够了，那么您可以使用搁置和操作系统缓存来以预先解析的格式保存数据。
You don't say what form your data is in, but if a keystore will suffice then you can use shelve along with OS caching in order to hold the data in a preparsed format.
另一种选择是使用 posix_ipc 将数据保存在共享内存中，可供所有进程使用。
Another option is to use posix_ipc to hold the data in shared memory, available to all processes.