> On Wed, 8 Nov 2006, Dennis Clarke wrote:
>
>> resources at hand. They do a very fine job of totally protecting me from
>> such obscenities as :
>>
>> :(){ :|:& }; :
>>
>> When presented to the bash shell that seems to really upset the system.
>> IT
>> will completely crash a Red Hat Enterprise 4 server but my Solaris server
>> here, left with stock bland /etc/system merely gets busy for a while.
>> With
>
> Heh. I should remember that one the next time some Linux weenie boasts of
> how stable his Linux system is... :-)
>
The bigger they are .. the harder they fall. I have been in that situation
in which I simply smile and ask "can I type 15 characters and hit return?"
and boom, that machine is toast. You will not even be able to ping it. Any
user can do this. Any user.
>> Possibly. I also wondered if the issue was that unzip is an IO bound
>> process and not really limited to CPU and RAM. If these were IO bound
>
> Could be...
[ insert chin scratching ]
>> processes then I would think that there was some logical point at which
>> the
>> kernel would say "oops, I can't drive any more IO, so let's stop
>> serviceing
>> new processes".
>
> I don't think that would happen; instead, you'd see the "b" kthr column
> in vmstat increase.
yep .. blocked processes go into that second bucket. I agree.
>> Precisely what I was thinking. Except that third column is "swapped out
>> processes" and how does one pull them back from the brink of never never
>> land? What ladel reaches into that bucket and when?
>>
>> I don't rightly know.
>
> IIRC, everything will eventually get a chance to run, depending on what's
> on the system at any one instant, and the priority and runnablity of the
> processes. Even swpped out processes evntually get to run.
You would think that eh ?
Except that I have had occasions in which I check a server activity level
with vmstat and I see large numbers in that third column that never go away
until I reboot.
I'll have to go get data on that.
>
>> This is the sort of theory that begs to be tested a bit eh ?
>
> Sounds liek a fun idea. I once ran a fork bomb on my SB1000 for a few
> minutes. As you say, Solaris didn't bat an eyelid, although the load
> average was in the thousands.
Its an easy test. Be careful with the above abusive 15 char attack.
It will really make for a busy box real quick.
Dennis
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