HI, Yann Thank you for your reply and advices. I will try to tunning servers with your advices. It's my first time to vist this community and very glad to meet you who can bear my poor English. Thank you very much 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） ------------------------------------------------------------------------------------------- -----邮件原件----- 发件人: Yann Ylavic <ylavic.dev@xxxxxxxxx> 发送时间: 2022年4月15日 21:51 收件人: users@xxxxxxxxxxxxxxxx 主题: Re: 答复: [users@httpd] [apache]maxconnectionsperchild problem On Fri, Apr 15, 2022 at 2:16 PM 刘孟 <liumeng@xxxxxxxxxxxxxx> 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. > > 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 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-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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