Re: [PATCH] OOM handling

Martin Dalecki
2001-03-25T15:20:34Z

Rik van Riel wrote:
>
> On Sun, 25 Mar 2001, Martin Dalecki wrote:
>
> > Ah... and of course I think this patch can already go directly
> > into the official kernel. The quality of code should permit
> > it. I would esp. request Rik van Riel to have a closer look
> > at it...
>
> - the algorithms are just as much black magic as the old ones
> - it hasn't been tested in any other workload than your Oracle
> server (at least, not that I've heard of)

No that's not true! Read the code please. The result is a simple
wighted sum without artificial unit.

> - the comments are just too rude ;)
> (though fun)

That's only a matter for the "smooth" anglosaxons. Different
cultures have different measures on this. I don't feel the need
to adjust myself to the american cultural obstructivity.
I esp. to the habit of don't saying clearly what one means if one
want's to criticize something.

> - the AGE_FACTOR calculation will overflow after the system has
> an uptime of just _3_ days
> - your code might be good for server loads, but for normal
> users it will kill what amounts to a random process ... this
> is horribly wrong for desktop systems

No that isn't true. I esp. the behaviour will be predictable.

> In short, I like some of your ideas, but I really fail to see why
> this version of the code would be any better than what we're having
> now. In fact, since there seem to be about 1000x more desktop boxes
> than Oracle boxes (probably even more), I'd say that the current
> algorithm in the kernel is better (since it's right for more systems).

You misunderstood me compleatly. I wasn't using an running oracle
db as a test case. I was using the INSTALLATION process.
Since you apparently don't know about oracle I will tell you:
It involves a lot of different applications. Infact TONS of:
Java, shell, compiler, linker, apache, perl and whatanot.

> Now if you can make something which preserves the heuristics which
> serve us so well on desktop boxes and add something that makes it
> also work on your Oracle servers, then I'd be interested.

I would like to state: The current heuristics DON'T serve us well
on desktop boxes...

> Alternatively, I also wouldn't mind a completely new algorithm, as
> long as it turns out to work well on desktop boxes too. But remember

I was testing on a NOTEBOOK.

> that we cannot tell this without first testing the thing on a few
> dozen (hundreds?) of machines with different workloads...

That's true for sure.