I'm currently testing MIMEDefang 2.42 on a PC running Red Hat 9
with just 128 MB of RAM (too little for a production server, obviously). I'm using SpamAssasin 2.63 and Razor 2.40. Only my mail is going
through the "server".
I ran into a situation where somebody comment-spammed my blog and I received about 20 notification emails at once. This forked off the max number of mimedefangl.pl slaves (10), causing my server to thrash. None of the slaves finished within the 10 minute busy timeout. So I brought the max slaves down to 4, and when the blog server tried to send the messages again, at least some of them got through, with the rest producing "451 4.7.1 Please try again later" errors. All the mail eventually got through.
QUESTIONS
Now I'm trying to figure out how much memory N slaves running simultaneously require.
I notice that the mimedefang.pl slaves are fairly big in terms of reported memory size:
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
3658 defang 16 0 30752 23M 2204 S 0.0 19.3 0:08 0 mimedefang.pl
3678 defang 17 0 28700 23M 1500 S 0.0 18.9 0:06 0 mimedefang.pl
3666 defang 15 0 28664 23M 1464 S 0.0 18.7 0:06 0 mimedefang.pl
The first thing I'm trying to understand is: what's using the memory?
Using the perl debugger, I noticed that just importing
Mail::SpamAssassin brings the total size up to 20+ MB. Of course, this entails importing quite a few other modules in the
process.
Is any of this memory shared between the slaves? Do N slaves
require N x 25 MB of RAM?
Thanks in advance.
-David
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D a v i d E i s n e r c r a d l e @ u m d . e d u CALCE EPSC University of Maryland
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