Subject: Re: i386 1.4Q hangs nonrandomly?
To: None <firstname.lastname@example.org>
From: Michael C. Richardson <email@example.com>
Date: 01/28/2000 11:32:18
>>>>> "Simon" == Simon Burge <firstname.lastname@example.org> writes:
Simon> Matthew Orgass wrote:
>> Hmm, heavy memory load... sounds familiar: I've noticed that running
>> "grep foo /dev/zero &; grep foo /dev/zero &;" will lock up my system
>> within a minute 100% of the time when X is running. ... It looks
>> like it gets stuck in a loop and spends most or all of its time in
>> uvmpd_scan. I just sent in a pr (kern/9308). Sounds like this might
>> possibly be what is happening to you.
Simon> Initially I'd guess it was a different problem. Note that grep(1)
Simon> will allocate memory for the contents of a file until it hits a
Simon> \n, and obviously this doesn't occur for /dev/zero. With two
Simon> greps on /dev/zero, you'll very quickly get two processes trying
Simon> to allocate a large amount of memory (128MB each on my -current
Simon> i386). How much RAM and swap does your box have?
Simon> The maintainer of GNU grep says that you should have enough
Simon> virtual memory to allocate the longest line possible, and doesn't
Simon> want to change that behaviour...
Huh? That's silly.
I might be grepping from a network pipe, or as you tried a file of
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