Hi Mark, while I was trying to figure out and measure the performance of a amavisd+postfix+spamassassin system, to see whether the TimeElapsedSpamCheck was reliable, I was coming out with this patch (see attach) to know which plugin is effectively loaded by amavisd. In fact I haven't found such information in logs, and for testing purpose one have to put at least in the same conditions as of the amavisd user, and need to know all the plugins effectively loaded (often the ones from the amavis user are not the same as the system-wide SA). Can you include (or maybe a better one) it in the next release?
Apart this I found that on a typical Dual Quad Xeon 5420 2.5Ghz (indeed the extra 7 cores aren't used very much unless you increase the concurrency level), a typical run with: "spamassassin -t -D < mailspam.msg" takes around 10s, so the 7-8s shown for TimeElapsedSpamCheck by amavisd-agent should be reliable, considering also that it should run in daemon mode so the loading time shouldn't be counted. Of these 10s, 7-8 seconds are usually taken by DNSBL SA checking; disabling all the network checking (i.e. using spamassassin -t -D -L < mailspam.msg), and redoing the tests, this 10s usually drops around 3.9s, while further using the compile (Rule2XS) feature, these 3.9s drops to 2.6s (40% better). Now I'd like to do the same evaluation for amavisd, i.e. with all the network testing disabled. Is there a way to disable for instance the DNSBL and all the remote testing in one shot from within amavisd.conf (more or less like the -L option does for the spamassassin standalone command)? I tried to add sort of "skip_rbl_checks 1" to user_prefs but isn't effective. In this way should be possible to evaluate the theoretical peak limit (in msgs/day) that a server could sustain per CPU/core and tune up the performance accordingly under the best conditions. BTW, what other values people reach under latest spamassassin (3.2.5) and amavisd-new (2.6.1) in these subject? At this point I would like to ask you whether the following feature could be added and if it's worthwhile: it seems that most of the spam is sent during night and the weekend. Would be possible to add amavisd-new a feature to have it's behaviour selective according to the time: e.g. since 75% of SA time is spent over DNS|RBL checks, and often a server need to be much more responsive in sending and receiving mails during daylight, would be fine to have a sort of two profiles in amavisd-new: one for day (with maybe all network tests disabled) and one for night and weekends under which the network testing are disabled. In this way, when during daylight much server power and responsiveness is needed for delivering mails it won't spent much time in DNS|RBLs (ok, it will pass more spam), while during night it could use all the tests available. Such approach theoretically could be made with some sed|perl "search & replace" scripts for user_prefs, commenting or uncommenting on the fly some test, and then restarts the amavisd process, but this sound a sort of ugly and awkward, and would be much more elegant inside amavisd. Thanks Bye Giuseppe. ------------------------------------------------------------------------------ _______________________________________________ AMaViS-user mailing list AMaViS-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amavis-user AMaViS-FAQ:http://www.amavis.org/amavis-faq.php3 AMaViS-HowTos:http://www.amavis.org/howto/
