The cool thing is Linux can just discard the cached entries when a
application needs real RAM. Don't worry about your RAM usage until you
see swap climbing and/or the buffers and cache dropping down to near
zero.
Yes, yes, I knew about caches versus HD access, but I didn't realize what types of cache there were and what their uses were. It struck me when you mentioned "buffers and caches," as they are labeled in top, that a buffer shouldn't stay full, and why should my bloody system have 150M of unflushed buffers? But, of course the labels meant "buffer cache." I went looking for some more info on this and found this, if anyone's interested:
http://www.linux-tutorial.info/cgi-bin/display.pl?310&0&317&0&3
I _am_ curious how much overhead is involved in deciding what to dump, dumping the page, then allocation, and if that could have any effect on time critical applications with a recent linux kernel. I'm betting not much if at all, but I'll read up on it when I have the time.
[OT]:
Maybe if this subject hadn't been covered 3 times in less weeks. You
seem to first have missed the previous comments on this subject, and
second you could have overlooked a one line non personal vent when there
was a couple of paragraphs that explained clearly what you needed to
know.
[You know Critch, I have to apologize - my impression of you, beyond the time you bummed our floorspace at DragonCon, was of a self-important suffer-not-the-newb kind of guy. It was a lot of that kind of sniping that led me to blow off the NLUG list a while back, and my daily runs through the * list traffic---more skimming really...not enough time for this and work too--- seemed to confirm it. I just went looking through the archive, though, and noticed far fewer harping messages from you than I thought. I think I fixated on the "read more before you ask again" posts because you tend to <snip> more and top post less making them more quickly readable, and because I pay more attention to the general questions. My "sanctimonious bullshit" remark was meant to encompass _all_ the harp that I thought you enganged in, which turns out to be much less than I thought. Fancy that.
By the way, do you know where that mythical kiss-my-ass list is hosted, and how much they charge?]
Bob
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