From: ludo@gnu.org (Ludovic Courtès)
To: Christopher Baines <mail@cbaines.net>
Cc: 28198@debbugs.gnu.org
Subject: [bug#28198] [PATCH 1/4] vm: Add disk-image-size to <virtual-machine>.
Date: Tue, 26 Sep 2017 09:14:28 +0200 [thread overview]
Message-ID: <87y3p22ap7.fsf@gnu.org> (raw)
In-Reply-To: <20170925213648.25ef5dd1@cbaines.net> (Christopher Baines's message of "Mon, 25 Sep 2017 21:36:48 +0100")
Hi Chris!
Christopher Baines <mail@cbaines.net> skribis:
> On Thu, 31 Aug 2017 14:29:56 +0200
> ludo@gnu.org (Ludovic Courtès) wrote:
>
>> Hi Chris,
>
> Thanks for reviewing these patches Ludo, unfortunately its taken me
> nearly a month to get around to replying.
>
> Thankfully, I've made some progress in that time.
>
>> Christopher Baines <mail@cbaines.net> skribis:
>>
>> > * gnu/system/vm.scm (<virtual-machine>): Add
>> > disk-image-size.
>> > (port-forwardings->qemu-options): Use disk-image-size from
>> > <virtual-machine>.
>>
>> In which case is it useful? Perhaps if you want to create lots of
>> data on the root file system in the MongoDB test?
>>
>> Currently <virtual-machine> builds a shared-store VM (like ‘guix
>> system vm’) in which the root file system has a fixed size that’s
>> usually good enough.
>
> The best answer I have at the moment is that I think MongoDB creates a
> rather large file, even if it has no data to store in it. I'll do some
> more investigation to confirm this though.
OK, that’s a good reason anyway. :-)
>> > --- a/gnu/system/vm.scm
>> > +++ b/gnu/system/vm.scm
>> > @@ -653,6 +653,8 @@ it is mostly useful when FULL-BOOT? is true."
>> > (default #f))
>> > (memory-size virtual-machine-memory-size ;integer (MiB)
>> > (default 256))
>> > + (disk-image-size virtual-machine-disk-image-size ;integer
>> > (bytes)
>> > + (default (* 70 (expt 2 20))))
>>
>> I think we can use 'guess here as the default value (and we should do
>> the same in places where #:disk-image-size has an arbitrary default.)
>
> I've been looking at this in the last few days. Making 'guess the
> default value here does mean something, and I think it's a good idea.
>
> As far as I can tell, for this specific test, these are the 3 functions
> that are called on the way to using the actual size, and the defaults
> they have:
>
> system-qemu-image/shared-store-script default:
> (* (if full-boot? 500 70)
> (expt 2 20)))
>
> system-qemu-image/shared-store default:
> (* (if full-boot? 500 30)
> (expt 2 20)))
>
> qemu-image default:
> 'guess
>
> From my tests, if the default in the <virtual-machine> is set to
> 'guess, then for the mongodb test the guess seems to be 0 MiB at the
> moment, which doesn't work. I've started looking at setting a sensible
> default in qemu-image, so that the root filesystem size isn't 0 MiB.
Indeed. Maybe we can go with your patch as-is and investigate the
problem with 'guess separately. Thoughts?
(I’ll comment on the other issue separately.)
Thanks,
Ludo’.
next prev parent reply other threads:[~2017-09-26 7:15 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-23 9:18 [bug#28198] [PATCH] Add MongoDB package and service Christopher Baines
2017-08-23 9:25 ` [bug#28198] [PATCH 1/4] vm: Add disk-image-size to <virtual-machine> Christopher Baines
2017-08-23 9:25 ` [bug#28198] [PATCH 2/4] gnu: Add mongodb Christopher Baines
2017-08-31 12:32 ` Ludovic Courtès
2017-09-30 8:04 ` Christopher Baines
2017-08-23 9:25 ` [bug#28198] [PATCH 3/4] services: Add MongoDB Christopher Baines
2017-08-31 12:34 ` Ludovic Courtès
2017-09-30 8:05 ` Christopher Baines
2017-08-23 9:25 ` [bug#28198] [PATCH 4/4] tests: databases: Add MongoDB test Christopher Baines
2017-08-31 12:37 ` Ludovic Courtès
2017-09-30 8:09 ` Christopher Baines
2017-08-31 12:29 ` [bug#28198] [PATCH 1/4] vm: Add disk-image-size to <virtual-machine> Ludovic Courtès
2017-09-25 20:36 ` Christopher Baines
2017-09-26 7:14 ` Ludovic Courtès [this message]
2017-09-29 6:48 ` [bug#28635] " Christopher Baines
2017-08-26 22:33 ` [bug#28198] [PATCH] Add MongoDB package and service Roel Janssen
2017-08-27 22:30 ` Christopher Baines
2017-09-30 7:59 ` [bug#28198] [PATCH 1/3] vm: Add disk-image-size to <virtual-machine> Christopher Baines
2017-09-30 7:59 ` [bug#28198] [PATCH 2/3] gnu: Add mongodb Christopher Baines
2017-10-04 14:40 ` Ludovic Courtès
2017-09-30 7:59 ` [bug#28198] [PATCH 3/3] services: Add MongoDB Christopher Baines
2017-10-04 14:44 ` Ludovic Courtès
2017-10-06 20:29 ` bug#28198: " Christopher Baines
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