by Ric » Sat, 10 Jul 2004 21:05:42
I have a e4500 with 14GB physical memory and 14GB swap. When my
database team performs a hot backup that uses the cp command the
system shows that 10GB of the swap area is consumed. I can totally
justify that (and explain it to them), since they write to /tmp. What
I have a hard time explaining is why PHYSICAL memory is also dropped
to 1GB free. Does anyone have an answer or a link to documentation
about this?
Cheers,
Rick
by Darren Dunha » Sun, 11 Jul 2004 00:34:15
/tmp will go to RAM first, right? Going to disk first would be
pointless, yes? Why shouldn't RAM be used?
--
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1. Is "shared memory" a way to reduce physical memory usage?
Hi, unix gurus:
Here's my situation, we have a server which, when runs, will consume a
large amount of memory(about 400M) by caching a lot of tables. We can
run multiple instances of the server on one machine, but each of them
will have its own copy of cached tables, which is of course a waste. To
get rid of this limitation, some folks here are talking about
using "shared memory" to handle the table caching, but I really doubt
about this:
1. I believe shared memory is just a mapping mechanism, so if one
process has ,say, 100M shared memory, other process will still need
100M physical memory to map it, am I right ?
2. shared memory itself has some limitation, I'm not sure whether it
can handle as much as 400-500M.(we're running HP-UX 10.20 now).
So my question is if shared memory is not an option, what is the
typical way to handle a situation like this? I'm thinking about to have
a separate data server which handles all database transaction/cacheing
and it talks with other processors through some kind of IPC or RPCs,
and multi-threading might be an option too. Are there any commercial
products which can help here?
BTW, we're using hp-ux 10.20 with sybase 11.xx.
Any opinion/suggestion is very much appreciated.
-Peter
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