Date: Fri, 15 Mar 2002 10:35:16 +0200 From: Girnet Vladimir <VGirnet@megadat.com> To: "'questions@freebsd.org'" <questions@freebsd.org> Subject: explanation needed... Message-ID: <8E9035BABCA0514EB0E574B6A7082FC3053210@sln01.megadat.com>
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Hi
I tried to understand all of memory managment parameters from FreeBSD
kernel, but don't find a good explanation.
I alredy posted some messages here, also without succes.
What parameter in what cases must be modified? (Let say, a system with 1GB
of memory, 2GB of swap, what will let some processes to grow up to 1GB or
more)
So, where I can find more about this:
options MAXDSIZ="(256*1024*1024)"
options MAXSSIZ="(256*1024*1024)"
options DFLDSIZ="(256*1024*1024)"
# System V shared memory and tunable parameters
options SYSVSHM # include support for shared memory
options SHMMAXPGS=1025 # max amount of shared memory pages (4k on
i386)
options SHMALL=1025 # max amount of shared memory (bytes)
options SHMMAX="(SHMMAXPGS*PAGE_SIZE+1)"
# max shared memory segment size (bytes)
options SHMMIN=2 # min shared memory segment size (bytes)
options SHMMNI=33 # max number of shared memory identifiers
options SHMSEG=9 # max shared memory segments per process
# System V semaphores and tunable parameters
options SYSVSEM # include support for semaphores
options SEMMAP=31 # amount of entries in semaphore map
options SEMMNI=11 # number of semaphore identifiers in the
system
options SEMMNS=61 # number of semaphores in the system
options SEMMNU=31 # number of undo structures in the system
options SEMMSL=61 # max number of semaphores per id
options SEMOPM=101 # max number of operations per semop call
options SEMUME=11 # max number of undo entries per process
# System V message queues and tunable parameters
options SYSVMSG # include support for message queues
options MSGMNB=2049 # max characters per message queue
options MSGMNI=41 # max number of message queue identifiers
options MSGSEG=2049 # max number of message segments in the
system
options MSGSSZ=16 # size of a message segment MUST be power of
2
options MSGTQL=41 # max amount of messages in the system
> Looking forward to your reply,
> Vladimir Girnet
> "MEGADAT.COM" S.R.L.
> MOLDOVA, Chisinau
> www.megadat.com
>
>
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