※ 引述《[email protected] (關公)》之銘言：
: 請教要同時提供80人使用openwebmail,硬體的配備等級大概要如何呢?
: 1.cpu ?
: 2.ram ?
: 又openwebmail比較吃cpu還是ram呢?謝謝!
轉一下 openwebmail 裡面的文件給你看 :)
文件有提到 Memory 要吃多少，CPU 的話因為是跑 perl，所以勢必沒辦法多快..
請自行測試效能後再評估吧 :X
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an rough estimation of the memory usage of Open WebMail
=======================================================
At first, the program itself takes at least 5.5 MB...:(
folder view
===========
The memory usage in the folder view is proportional to the message count
in the mail folder, but it grows very little as message counts increases.
It is about
5.5MB(main) + message_count * 0.2k
read a message
==============
There are 2 stages here:
a. To get the message showed on your browser, Open WebMail CGI needs
to parse the whole message to determine how to display the message
header, body and all attachments. Then it returns the html page and
the CGI process terminates. Memory usage at this stage is
5.5MB(main) + message_size
b. When the browser gets the html page, it will request all inline
images embedded in this page. Each images will cause one CGI process.
Memory usage for each CGI process will be
5.5MB(main) + message_size + 2 * attachment_size
When the image transferring is starting, the memory usage will down to
5.5MB(main) + message_size + attachment_size
ps: Most browser will request at most 4 images simultaneously.
example:
We have a message with 5 attachments and each attachment is 1MB in size,
3 of them are graphics and 2 of them are Ms-word docs.
At stage (a), the memory usage is
5.5(main) + 5 = 10.5 MB
At stage (b), each image takes
5.5(main) + 5 + 2*1 = 12.5 MB
Since there are 3 images in the message,
so the total memory usage for stage (b) will be
12.5 * 3 = 37.5 MB
If we consider the shared library and code page sharing support on
most unix, some of the 5.5MB part of each CGI process may shared with
others. So the total memory usage will be somewhat less than the above.
And if user clicks the link of word docs for download,
the memory usage will be
12.5 MB
send a message
==============
There are also 2 stages in the sending of message
a. the user attaches an attachment to the message
b. the user presses the [send] button to send the whole message.
The memory usage for these 2 stages has no relation with the
message or attachment size. It is about 5.5 MB.
Conclusion
==========
Amazing? Yes, this program is a memory hog.....
You'd better install more ram on your webmail server to make it faster...
04/26/2001
[email protected]
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-- G.Chaucer --
And if that at myn owene lust I brenne,
Fro whennes cometh my wailing and my pleynte？
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