I bookmarked a fairly decent description of these parameters a while back: http://www.puschitz.com/TuningLinuxForOracle.shtml#SettingSharedMemory
Maybe you already know this, but you can also set these parameters in /etc/sysctl.conf. That way they persist between reboots, etc. -Ron- 2009-03-05_13:43:30-0500 Giacomo Mulas <[email protected]>: > Hello, I am trying to run a demanding quantum chemistry program on a cluster > of multiprocessor machines. Each machine has 2 dual-core opterons and 16Gb > of RAM, and is running a 64 bit kernel (currently 2.6.26) and userspace > (lenny) system. Interprocess communications among processes on the same > node go via shared memory (a lot of it), hence I need to set it to the > maximum possible. > > Can somebody tell me what are the maximum supported values for shmmax, > shmmni and shmall (I know I can set them via /proc/sys/kernel pseudofiles) > or (even better!) tell me how I can calculate them? Is it likely that a > too large value of shmmax or the other two can cause applications to > segfault? > > Thanks in advance, > Giacomo Mulas > > -- > _________________________________________________________________ > > Giacomo Mulas <[email protected]> > _________________________________________________________________ > > OSSERVATORIO ASTRONOMICO DI CAGLIARI > Str. 54, Loc. Poggio dei Pini * 09012 Capoterra (CA) > > Tel. (OAC): +39 070 71180 248 Fax : +39 070 71180 222 > Tel. (UNICA): +39 070 675 4916 > _________________________________________________________________ > > "When the storms are raging around you, stay right where you are" > (Freddy Mercury) > _________________________________________________________________ > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > > -- > To UNSUBSCRIBE, email to [email protected] > with a subject of "unsubscribe". Trouble? Contact > [email protected] -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
