Hi Joseph, thank you for your answer. While i was reading about clustering some weeks ago i read the openmosix FAQ claiming that openmosix would not work with apache, because apache was using shared memory to communicate with its threads, and i always thought mysql is designed the same way. Please someone correct me if i am wrong.
Regards, Philipp On Wed, 19 Mar 2003 10:41:21 +0100 Joseph Bueno <[EMAIL PROTECTED]> wrote: > Hi, > > Since shm (shared memory) in Unix/Linux is only used to share memory > between independent processes and mysql server is a single process > (multi-threaded), I am convinced that shmmax value has no consequence > on mysql. (OTOH Oracle has a multiprocess architecture and uses > shared memory). > > Hope this helps, > Joseph Bueno > > Philipp wrote: > > Dear Walt, dear List, > > > > > > thank you for your reply. Finally a suggestions at all. > > I checked both > > > > /proc/sys/kernel/threads-max > > /proc/sys/kernel/shmmax > > > > I dont think threads-max will be a problem, because the value is 14336, > > and i dont think my system will ever have to handle this number of threads. > > > > But researching shmmax at google i got several hits. Most are dealing with > > postgres but perhaps its the same with mysql. > > > > shmmax ist 32 MB. on one page the author suggest to raise this value to 128 > > MB. > > > > What are your suggestions for the values: > > > > shmall shmmax shmmni ? > > > > > > Thank you very much, > > Yours Philipp > > > > ----- Original Message ----- > > From: "walt" <[EMAIL PROTECTED]> > > To: "Philipp" <[EMAIL PROTECTED]> > > Cc: <[EMAIL PROTECTED]> > > Sent: Monday, March 17, 2003 6:48 PM > > Subject: Re: Process Limit on Linux ? > > > > > > > >>Philipp wrote: > >> > >>>Hi there, > >>> > >>>i wrote several times to the list asking for help with a problem > >>>regarding process limits on linux, but never got an answer. > >>>today i found this story: > >>> > >>>http://www.mysql.com/press/user_stories/handy.de.html > >>> > >>>here are the relevant sentences: > >>> > >>>"We had some process limit problems on our Linux Systems, > >>>but thanks to your support we where able to patch the linux boxes > >>>and move the limit to a size that meets our needs (we've got an average > > > > of > > > >>>about > >>>1600 concurrent threads per server)." > >>> > >>>These people use 2.2 Kernels so i dont know if the mentioned kernel and > >>>glibc > >>>patching is also relevant for me, as i am using 2.4 kernels only. > >>> > >>>Here is my problem in detail: > >>> > >>>i am using mysql-3.23.55 binary packages on linux 2.4.20 and i raised > > > > ulimit > > > >>>values and configuration in my.conf to allow more then 1500 threads. but > >>>when > >>>there are around 750 threads a new client connecting is told something > > > > like > > > >>>that (dont have the errno at the moment, i think its 11): > >>> > >>>"cant create new thread, perhaps you are out of memory or there is a > >>>os-depended bug". > >>> > >>>The machine only runs apache and mysql and is a Xeon 2x2 2.4 Gz with 2 > > > > GB of > > > >>>RAM. > >>>cat /proc/meminfo sais that more then 1 Gig is used for caching, so > > > > memory > > > >>>should be no > >>>problem . > >>> > >>>Please, if you have any ideas, let me know. If it is a kernel issue, > > > > tell me > > > >>>to go to linux mailing lists > >>>or if its some kind of "secret issue" only the support will be able to > >>>answer let me know that. > >>> > >>>Thanks in advance, > >>>Philipp > >>> > >>>--------------------------------------------------------------------- > >>>Before posting, please check: > >>> http://www.mysql.com/manual.php (the manual) > >>> http://lists.mysql.com/ (the list archive) > >>> > >>>To request this thread, e-mail <[EMAIL PROTECTED]> > >>>To unsubscribe, e-mail > > > > <[EMAIL PROTECTED]> > > > >>>Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php > >> > >>Philipp, > >>Did you check /proc/sys/kernel/threads-max? I know with oracle 8i, you > >>are supposed to increase /proc/sys/kernel/shmmax as well as some other > >>values. You might check into that and see if changing those values will > >>help. > >>Does your syslog say anything when these problems occur? > >> > >>walt > >> > >>walt > >> > > > > -- ----------------- Philipp Steinkrueger Oberberg Online Informationssysteme GmbH Technik http://www.oberberg.net PGPkeyID: 690A9504 Key Fingerprint: 35CE 467E C813 06B0 B8E3 0275 2B1E E84A 690A 9504 --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
