Hi Frank Gingras I am sorry I missed this mail.
I have got your advice and gone to study event mpm. I had study worker mpm before and very concerned about its instability in processing large volume servers and the interaction between threads. I don’t know if event mpm can avoid this problems but I will study it. Thank you for you advice again Best regards ------------------------------------------------------------------------------------------- 刘孟 Liu Meng Project Development Dept. Tel : 010 82306399-7526 /Phone : 18500386112 北京図迅豊達信息技術有限公司 北京市海淀区北清路永豊路交差点東南 四維図新ビルA－8F Address : 8Floor,A Block,NavInfo Building, Southeast Crossing of BeiQing Rd. and YongFeng Rd., HaiDian District, Beijing（100094） ------------------------------------------------------------------------------------------- 发件人: Frank Gingras <thu...@apache.org> 发送时间: 2022年4月16日 2:45 收件人: users@httpd.apache.org 主题: Re: [users@httpd] 答复: [users@httpd] [apache]maxconnectionsperchild problem Aside from the useful tuning tips, I would also caution against using prefork for high-volume servers. The event mpm would scale better. On Fri, 15 Apr 2022 at 09:55, Yann Ylavic <ylavic....@gmail.com<mailto:ylavic....@gmail.com>> wrote: On Fri, Apr 15, 2022 at 3:50 PM Yann Ylavic <ylavic....@gmail.com<mailto:ylavic....@gmail.com>> wrote: > > On Fri, Apr 15, 2022 at 2:16 PM 刘孟 > <lium...@telemap.com.cn<mailto:lium...@telemap.com.cn>> wrote: > > > > > > What I want to ask is, will these 1000 sub processes fail at the same time, > > causing my httpd serivce to stop responding.But I think you have given the > > answer > > >because the clients connections themselves will not have the same > > >lifetime (including keep-alive in between requests). In my opinion the > > >risk is negligible. > > > > I think setting MaxConnectionsPerChild will lead to a slight decrease in > > the processing capacity of my server, > > but the possibility that all processes failed at the same time can be > > ignored.. Is my understanding correct > > Yes, and I don't think there will be a noticeable capacity change if > you don't set MaxConnectionsPerChild too low (the right tuning depends > on the number of connections per second). > > > > > in this way, the restart action usually occurs in the busiest period of the > > server in daytime, > > so I think your advice of using cron is a good suggestion. Of course, in > > order to prevent all httped services from > > stopping at the same time, I think I should set cron for the servers at > > different times. Is that I am in the right way? > > Yes, and ideally your DNS switches do not happen at the load peak, so > there should be too much processes restarted when the cron executes. "there should *not* be" > > > > > I also thank you for your suggestions on max/minspareservers. The > > adjustment of them will also be in my plan. > > > you probably should raise it to something more close to MaxRequestWorkers > > > for efficiency. > > > > Do you mean I should adjust it to a daily peak of about 1000? > > Yes, that way at the load peak you have the full capacity of > processes, and after the peak they should be killed by > MaxConnectionsPerChild at some point (without being restarted) hence > move towards MinSpareservers, until the next peak.. > So you should find the MaxConnectionsPerChild setting that does kill "that does *not* kill" > processes too often at load peak but still kills enough processes > after the peak (during the ramp down). > > > Regards; > Yann. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org<mailto:users-unsubscr...@httpd.apache.org> For additional commands, e-mail: users-h...@httpd.apache.org<mailto:users-h...@httpd.apache.org>
