On Thu, 07 Apr 2005, Wolfgang Powisch wrote: > What should be the expected behaviour when reaching the maxchilds limit.
No more children are spawned, with a possible off-by-one error (i.e. you could end up with maxchilds+1 children, but that's it). > What's the reason for the negative worker number ? A bug somewhere. The current code is supposed to bitch very loudly if anything weird happens (which is what the UNKNOWN stuff is all about). But it might not be 100% correct, I need to have another look at it, I did find a few weirdnesses in the original 2.1 patch I submitted that bacame the roots of what is the child tracking code in 2.2. At the time, I looked in 2.2 and could not find the same bug in there so I didn't look much further. > Apr 5 15:23:19 imap01 master[4065]: service pop3 pid 17896: while > trying to process message 0x3: not registered yet This is bad. Is 2.2's master multithreaded now? If it is not, it really should be impossible for the code to receive messages from services before they are registered (because master should try to process all the pending messages *after* it finishes registering every child it just spawned). The other possible scenario for that to happen is when dead children are forgotten too early. The code usued to wait at least 2s AFTER receiving a sigchild before forgetting a dead child, but either this is not enough in your case, or there is a bug in it. You can change the hardwired default in master.c and recompile to test it. I should tweak that stuff to be auto-tuneable some of these days. I remember squashing a bug on Debian's 2.1 master code that caused it not to process *all* available messages at every interaction (instead, it processed only one). This caused messages to pile up in busy sites and triggered the above issues. As I said, I think 2.2 does not have this bug, but it is something that could be checked. The fact that master STOPPED processing more workers means the resilience code against such bugs isn't quite right yet. So we have two bugs, at the very least. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh --- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
