From: "David Leimbach" <leimy2k@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] quantity vs. quality
Date: Sun, 11 Jun 2006 15:31:15 -0700 [thread overview]
Message-ID: <3e1162e60606111531g21d9acc6l9f0bf58e99cd9a08@mail.gmail.com> (raw)
In-Reply-To: <448B4F88.4090101@lanl.gov>
On 6/10/06, Ronald G Minnich <rminnich@lanl.gov> wrote:
> David Leimbach wrote:
> > On 6/9/06, Ronald G Minnich <rminnich@lanl.gov> wrote:
> >
> >> Latchesar Ionkov wrote:
> >> > Another example is using emalloc in libraries. I agree that it is much
> >> > simpler to just give up when there is not enough memory (which is also
> >> > not very likely case), but is that how the code is supposed to be
> >> > written if you are not doing research?
> >>
> >> yes, that is a problem with a lot of code. "Just bail on first error" --
> >> we've had to stop using emalloc here because that is very unrealistic
> >> for production support.
> >>
> >> ron
> >>
> >
> > Well I wonder what people typically do when they can't malloc anymore
> > memory but need more... A reasonable thing to do is to die I'd think.
>
> example.
>
> xcpu server is running a couple hundred processes for testing. It is
> asked to do one more. It can't allocate something.
>
> Just dying at that point is really a bad idea, and we did find that some
> of the libraries we were using would in fact do that, without coming
> back to xcpu server main code with an error. That's not good behaviour
> for xcpu server. It should gracefully return 'no more room' and keep
> managing things; in some few cases, the library did not give us that
> option.
I agree with you wholeheartedly. However there are times when you
*need* to malloc more memory but can't, based on how the program in
question is supposed to operate.
Having implemented parts of MPI's Dynamic Process Management
specification before, I totally understand where you're going.
I do find that, however, when I need to malloc more memory, not
getting what I ask for from malloc is not an acceptable run of the
program. This happens to me more often than the recoverable cases in
fact, so I often call "abort" when malloc comes back NULL (in testing
anyway... core dumps are handy).
>
> There are lots of cases like this, many of them in the kernel even;
> would we want the kernel to just toss chunks at these times?
Well in the kernel I agree it's a totally different ball game. There
are blocking and nonblocking memory allocators (in linux anyway).
next prev parent reply other threads:[~2006-06-11 22:31 UTC|newest]
Thread overview: 229+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-07 17:58 [9fans] gcc on plan9 Corey
2006-06-07 18:24 ` Roman Shaposhnick
2006-06-07 18:50 ` Ronald G Minnich
2006-06-07 18:55 ` William Josephson
2006-06-07 20:12 ` Ronald G Minnich
2006-06-07 20:20 ` Roman Shaposhnick
2006-06-07 20:42 ` Ronald G Minnich
2006-06-07 20:44 ` William Josephson
2006-06-07 21:00 ` Ronald G Minnich
2006-06-07 19:05 ` Roman Shaposhnick
2006-06-07 20:13 ` Ronald G Minnich
2006-06-07 20:48 ` Roman Shaposhnick
2006-06-07 21:04 ` Ronald G Minnich
2006-06-08 6:42 ` Roman Shaposhnik
2006-06-08 7:00 ` Iruatã Souza (muzgo)
2006-06-07 19:48 ` Corey
2006-06-07 20:16 ` Ronald G Minnich
2006-06-07 20:26 ` Roman Shaposhnick
2006-06-07 20:43 ` Ronald G Minnich
2006-06-08 5:49 ` lucio
2006-06-07 18:57 ` Francisco J Ballesteros
2006-06-07 19:55 ` Corey
2006-06-07 20:46 ` rog
2006-06-07 21:07 ` Corey
2006-06-07 21:16 ` Christoph Lohmann
2006-06-07 21:25 ` Rodolfo (kix)
2006-06-07 21:50 ` Corey
2006-06-07 21:54 ` David Leimbach
2006-06-07 21:56 ` Ronald G Minnich
2006-06-07 22:06 ` Lluís Batlle i Rossell
2006-06-07 22:16 ` David Leimbach
2006-06-07 22:31 ` Francisco J Ballesteros
2006-06-07 22:33 ` Ronald G Minnich
2006-06-08 9:44 ` Victor Nazarov
2006-06-09 21:13 ` Roman Shaposhnick
2006-06-08 1:28 ` quanstro
2006-06-09 13:12 ` Lluís Batlle
2006-06-09 13:21 ` quanstro
2006-06-09 13:47 ` Lluís Batlle
2006-06-07 23:04 ` geoff
2006-06-07 23:10 ` Steve Simon
2006-06-08 0:22 ` Bakul Shah
2006-06-08 0:27 ` geoff
2006-06-08 3:31 ` Ronald G Minnich
2006-06-08 15:04 ` David Leimbach
2006-06-08 15:20 ` Ronald G Minnich
2006-06-07 23:15 ` andrey mirtchovski
2006-06-08 0:17 ` geoff
2006-06-09 21:15 ` Roman Shaposhnick
2006-06-09 21:26 ` andrey mirtchovski
2006-06-09 21:27 ` andrey mirtchovski
2006-06-09 21:34 ` Roman Shaposhnick
2006-06-09 21:38 ` andrey mirtchovski
2006-06-09 21:44 ` andrey mirtchovski
2006-06-10 6:57 ` "Nils O. Selåsdal"
2006-06-08 1:58 ` Latchesar Ionkov
2006-06-08 0:53 ` geoff
2006-06-08 1:07 ` Latchesar Ionkov
2006-06-08 1:15 ` quanstro
2006-06-08 15:02 ` David Leimbach
2006-06-09 4:04 ` quanstro
2006-06-08 1:22 ` geoff
2006-06-08 1:25 ` Latchesar Ionkov
2006-06-09 21:21 ` Roman Shaposhnick
2006-06-09 21:27 ` Roman Shaposhnick
2006-06-08 14:59 ` David Leimbach
2006-06-09 4:05 ` quanstro
2006-06-08 1:39 ` [9fans] quantity vs. quality Lyndon Nerenberg
2006-06-08 3:05 ` Dan Cross
2006-06-08 3:44 ` Joel Salomon
2006-06-08 7:03 ` Roman Shaposhnik
2006-06-09 22:03 ` Roman Shaposhnick
2006-06-09 22:44 ` David Leimbach
2006-06-09 22:46 ` quanstro
2006-06-09 22:51 ` Latchesar Ionkov
2006-06-09 22:55 ` quanstro
2006-06-09 23:19 ` Latchesar Ionkov
2006-06-09 23:29 ` quanstro
2006-06-10 1:57 ` Latchesar Ionkov
2006-06-09 23:51 ` quanstro
2006-06-10 0:10 ` Roman Shaposhnick
2006-06-10 2:31 ` Latchesar Ionkov
2006-06-10 0:45 ` Roman Shaposhnick
2006-06-10 3:01 ` Latchesar Ionkov
2006-06-10 0:52 ` quanstro
2006-06-10 1:04 ` Roman Shaposhnick
2006-06-10 23:13 ` Ronald G Minnich
2006-06-11 0:44 ` quanstro
2006-06-11 5:08 ` lucio
2006-06-11 10:09 ` quanstro
2006-06-11 12:00 ` lucio
2006-06-11 22:59 ` quanstro
2006-06-11 23:26 ` geoff
2006-06-12 3:45 ` Paul Lalonde
2006-06-12 20:16 ` Ronald G Minnich
2006-06-12 20:23 ` Roman Shaposhnick
2006-06-12 20:56 ` Ronald G Minnich
2006-06-12 21:09 ` Victor Nazarov
2006-06-13 0:05 ` Roman Shaposhnik
2006-06-12 21:15 ` Francisco J Ballesteros
2006-06-13 12:08 ` rog
2006-06-13 16:34 ` Skip Tavakkolian
2006-06-13 21:35 ` "Nils O. Selåsdal"
2006-06-14 22:09 ` Roman Shaposhnick
2006-06-15 15:46 ` Victor Nazarov
2006-06-11 5:42 ` Russ Cox
2006-06-11 10:08 ` quanstro
2006-06-12 1:03 ` Roman Shaposhnik
2006-06-10 23:05 ` Ronald G Minnich
2006-06-11 0:00 ` quanstro
2006-06-10 0:24 ` andrey mirtchovski
2006-06-10 0:36 ` quanstro
2006-06-10 2:27 ` Latchesar Ionkov
2006-06-10 0:23 ` quanstro
2006-06-10 0:41 ` Paul Lalonde
2006-06-10 0:59 ` quanstro
2006-06-10 1:15 ` Paul Lalonde
2006-06-10 5:19 ` Bruce Ellis
2006-06-10 2:51 ` Latchesar Ionkov
2006-06-10 0:45 ` quanstro
2006-06-10 3:10 ` Latchesar Ionkov
2006-06-10 0:53 ` quanstro
2006-06-10 23:06 ` Ronald G Minnich
2006-06-10 23:15 ` geoff
2006-06-11 2:58 ` jmk
2006-06-10 23:04 ` Ronald G Minnich
2006-06-11 0:05 ` quanstro
2006-06-10 23:03 ` Ronald G Minnich
2006-06-09 23:25 ` Ronald G Minnich
2006-06-09 23:38 ` David Leimbach
2006-06-09 23:45 ` andrey mirtchovski
2006-06-09 23:46 ` Paul Lalonde
2006-06-10 23:03 ` Ronald G Minnich
2006-06-10 23:02 ` Ronald G Minnich
2006-06-11 0:12 ` quanstro
2006-06-11 2:20 ` Ronald G Minnich
2006-06-11 22:31 ` David Leimbach [this message]
2006-06-10 0:28 ` Roman Shaposhnick
2006-06-09 21:29 ` Roman Shaposhnick
2006-06-09 21:34 ` andrey mirtchovski
2006-06-08 1:49 ` [9fans] gcc on plan9 Ignacio Torres Masdeu
2006-06-08 14:10 ` David Leimbach
2006-06-09 4:09 ` quanstro
2006-06-09 5:25 ` David Leimbach
2006-06-07 22:39 ` Corey
2006-06-07 22:49 ` Paul Lalonde
2006-06-07 23:17 ` Corey
2006-06-07 23:37 ` Paul Lalonde
2006-06-08 0:50 ` quanstro
2006-06-08 1:16 ` John Barham
2006-06-08 14:51 ` David Leimbach
2006-06-09 4:49 ` ems
2006-06-09 12:07 ` quanstro
2006-06-09 19:17 ` Roman Shaposhnick
2006-06-09 21:27 ` Bakul Shah
2006-06-09 21:33 ` Francisco J Ballesteros
2006-06-09 21:39 ` quanstro
2006-06-09 21:56 ` Francisco J Ballesteros
2006-06-09 22:01 ` quanstro
2006-06-09 22:17 ` Francisco J Ballesteros
2006-06-09 22:35 ` quanstro
2006-06-09 22:22 ` Bakul Shah
2006-06-09 22:30 ` quanstro
2006-06-09 23:22 ` Bakul Shah
2006-06-10 13:51 ` Francisco J Ballesteros
2006-06-10 23:21 ` Ronald G Minnich
2006-06-11 0:07 ` LiteStar numnums
2006-06-10 0:00 ` Harri Haataja
2006-06-10 0:03 ` Bruce Ellis
2006-06-10 1:00 ` Roman Shaposhnick
2006-06-10 4:37 ` Iruatã Souza (muzgo)
2006-06-12 0:35 ` Roman Shaposhnik
2006-06-09 21:43 ` quanstro
2006-06-10 12:43 ` rog
2006-06-07 22:56 ` Christoph Lohmann
2006-06-07 23:08 ` Dan Cross
2006-06-07 23:32 ` Federico G. Benavento
2006-06-07 23:48 ` Dan Cross
2006-06-08 0:32 ` Corey
2006-06-08 1:04 ` jmk
2006-06-08 3:35 ` Ronald G Minnich
2006-06-08 3:51 ` Ronald G Minnich
2006-06-08 4:07 ` Roman Shaposhnik
2006-06-08 5:19 ` Ronald G Minnich
2006-06-08 6:07 ` Federico G. Benavento
2006-06-08 17:45 ` Micah Stetson
2006-06-08 18:54 ` Ronald G Minnich
2006-06-08 18:55 ` Iruatã Souza (muzgo)
2006-06-08 18:56 ` andrey mirtchovski
2006-06-08 19:01 ` Iruatã Souza (muzgo)
2006-06-09 19:56 ` Roman Shaposhnick
2006-06-09 22:19 ` quanstro
2006-06-09 23:19 ` Ronald G Minnich
2006-06-08 4:11 ` Paul Lalonde
2006-06-08 5:25 ` ems
2006-06-08 5:43 ` Simon Williams
2006-06-08 6:09 ` Bruce Ellis
2006-07-16 15:17 ` ASCII Glenda (was Re: [9fans] gcc on plan9) csant
2006-07-16 22:17 ` e.c.sharpe
2006-07-16 22:37 ` Jack Johnson
2006-07-17 8:35 ` Rodolfo (kix)
2006-06-08 1:06 ` [9fans] gcc on plan9 geoff
2006-06-08 1:21 ` quanstro
2006-06-08 10:15 ` Victor Nazarov
2006-06-08 9:40 ` Lluís Batlle
2006-06-08 15:55 ` Corey
2006-06-08 22:48 ` Fred Wade
2006-06-08 23:08 ` Roman Shaposhnick
2006-06-08 23:51 ` Corey
2006-06-07 20:46 ` Latchesar Ionkov
2006-06-07 19:07 ` Roman Shaposhnick
2006-06-07 19:17 ` Latchesar Ionkov
2006-06-07 19:26 ` Roman Shaposhnick
2006-06-07 19:35 ` Brantley Coile
2006-06-07 20:15 ` Ronald G Minnich
2006-06-07 20:32 ` Roman Shaposhnick
2006-06-07 19:47 ` Latchesar Ionkov
2006-06-07 20:00 ` Corey
2006-06-07 20:13 ` Roman Shaposhnick
2006-06-07 20:40 ` Ronald G Minnich
2006-06-08 6:49 ` Roman Shaposhnik
2006-06-07 21:21 ` Christoph Lohmann
2006-06-07 21:49 ` Ronald G Minnich
2006-06-07 22:50 ` Dan Cross
2006-06-08 7:30 [9fans] quantity vs. quality cej
2006-06-08 9:32 ` Lluís Batlle
2006-06-08 15:29 ` David Leimbach
2006-06-08 15:43 ` jmk
2006-06-09 6:01 cej
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