topic setting shmmax in Operating System - HP-UX

setting shmmax

Doug_3 — Thu, 23 Oct 2003 11:15:32 GMT

I have a new/used rp7400. It has 6 gig of mem ver 11.11. getconf KERNEL_BITS returns 64.

I tried to set shmmax to 1.6 gig with a value of 0x60000000 and SAM generated an error:
The value specified for tunable parameter "shmmax", "0x60000000", evaluates to "1610612736" which is more than the maximum allowed value of "1073741824".

I have an 11.00 set to 0x6000000 1.6 gig, so what needs to be done to increase the shared mem max value?

Thanks in advance,
Doug

Re: setting shmmax

A. Clay Stephenson — Thu, 23 Oct 2003 11:24:10 GMT

You need to apply patch PHKL_24032.

Re: setting shmmax

Steven E. Protter — Thu, 23 Oct 2003 11:26:23 GMT

Just a note on shmmax

Any setting higher than 25% of total memory will be ignored.

System memory is defined as memory plus swap.

Take a look at this doc:
http://www2.itrc.hp.com/service/cki/search.do?category=c0&docType=Security&docType=Patch&docType=EngineerNotes&docType=BugReports&docType=Hardware&docType=ReferenceMaterials&docType=ThirdParty&searchString=UPERFKBAN00000726&search.y=8&search.x=28&mode=id&admit=-1335382922+1066926347501+28353475&searchCrit=allwords

SEP

Re: setting shmmax

Bruno Ganino — Thu, 23 Oct 2003 11:46:07 GMT

Doug,
The following parameters control allocation of space for shared memory:
shmem
(Series 700 only). Enable or disable shared memory at system boot time.
shmmax
Maximum allowable shared memory segment size (in bytes).
shmmni
Maximum number of shared memory segments allowed on the system at any given time.
shmseg
Maximum number of shared memory segments that can be attached simultaneously to any given process.

Here documentation
http://docs.hp.com/hpux/onlinedocs/939/KCParms/KCparam.SharedMemParmsList.html

HTH
Bruno