Todd,
Yes I have an *idea* of how much latency it would create. Unfortunately I
don't think Red Hat does. Folks want to follow what company X says, and
not what I personally believe. So right now when I have to tell people
that "Yes I know what Red Hat is saying, but they're wrong" it takes a
little strategy. Anyhow, I appreciate the insight.
James S. Martin, RHCE
Contractor
Administrative Office of the United Sates Courts
Washington, DC
"Todd A. Jacobs" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
02/19/2003 09:01 PM
Please respond to redhat-list
To: [EMAIL PROTECTED]
cc:
Subject: Re: Swap Limits
On Wed, 19 Feb 2003 [EMAIL PROTECTED] wrote:
> It is my understanding that swap partitions are limited in size to 2GB,
Perhaps. File system limits go beyond that, now. Whether or not this still
applies to swap partitions is kind of murky, but it shouldn't apply to
swap *files*.
I'm not sure that this is a valid questions, though. Do you have any
*idea* how much latency you'd create with 4GB+ of swap? Even on a seperate
SCSI spindle, you'd spend huge amounts of time waiting for paging
operations if you were actively swapping that much RAM.
I usually allocate about 1GB at the beginning of the disk. Even that slows
things down a little, but provides plenty of elbow room without seriously
degrading performance.
A better question is why you think you'd need more than 3GB of RAM. You
could probably get away with a gig or less unless your apps are totally
out of control and building huge heap structures for silly reasons.
You should always use *some* swap, but the old multipliers aren't really
valid anymore. You need to balance memory requirements with paging
requirements, e.g. make sure you have enough RAM+SWAP to run your apps,
but remember that paging to disk will slow you down...maybe even kill your
server if you spend too much time disk-thrashing your swap.
--
"Of course I'm in shape! Round's a shape, isn't it?"
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