Very Computer

Hello all!  I have a quick question:

Is a ram disk possible in Solaric 2.5.1 ?

thanks!

Morgan Henning

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/tmp has been a tmpfs file system in all Solaris 2 releases.
tmpfs also existed in Solaris 1.x. I used it for /tmp on
4.1.3 as well.

Just remember that it isn't locked into RAM, but rather lives in swap,
so if you save big files in a tmpfs they will get swapped out
to disk. And filling a tmpfs file system uses the swap area your
apps want as memory. So make shure you have enough swap set up!

tmpfs should only be used for file systems with small and short-lived
files. That's why apps should write small files to /tmp and
large temporary files to /var/tmp.

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Birger Wathne

: Hello all!  I have a quick question:
:
: Is a ram disk possible in Solaric 2.5.1 ?
:
yea- it's called /tmp
:)

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swap      -     /foobar         tmpfs   -       yes     -

See also:  vfstab(4)

It would, actually, be nice if there were an option to lock the space used
into physical memory.  This is a one-liner change to the BSD mount_mfs but
might be harder for Sun to implement; I have no way of knowing.

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=>
=> Hello all!  I have a quick question:
=>
=> Is a ram disk possible in Solaric 2.5.1 ?
=>
=> thanks!

        Yes, it's called tmpfs.  Try this:

        mount -F tmpfs swap /mnt

        You can also limit it's size with the "-o size=" option.  It's
most commonly used for the /tmp directory.  It's also not completely
like a PC ramdisk, since the operating system can swap out chunks of
it as needed.
--
Jason C. Austin

seems like a lot of bother compared to /tmpfs, but
you can "be a purist" about this if ya just wanna.
j.
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Jay Scott               512-835-3553

Applied Research Labs, Computer Science Div.
University of Texas at Austin

go to www.datram.com, they made a ramdisk for dec, sun etc. but how about
a bunch of 64mb simms instead. princeton univ built a sun with 2 gig of
main memory, if the memory manager is still available from sun
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-----------------------------------------------
2 + 2 = 5 for relatively large values of 2.

Tmpfs will offer you fast meta data as well and is as good as a RAMdisk
for most purposes.  If you use some data repeatedly, it will mostlikely
remain cached in main memory, if access speed is the concern.

For the most parts, RAMdisks are a waste of memory and tmpfs is really
the "in between" you want.

Casper
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Expressed in this posting are my opinions.  They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.

Quote:> For the most parts, RAMdisks are a waste of memory and tmpfs is really
> the "in between" you want.

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Regards,
Andrey

Besides, you can limit tmpfs swap usage and not run out of swap
by filling up tmpfs.

Casper
--
Expressed in this posting are my opinions.  They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.