Re: [PATCH] isar-bootstrap: Increase cache room

[Claudius Heine <claudius.heine.ext@siemens.com>]

Hi Alex,

On 2018-05-07 17:48, Alexander Smirnov wrote:
> According to the man page for 'apt.conf', there are three variables:
>   - Cache-Start: initial size of mmap cache room
>   - Cache-Grow: gap for dynamic mmap cache growth
>   - Cache-Limit: maximal cache size after growth
> 
> If dynamic resize of mmap region is not avaialbe, the apt uses
> pre-allocated Cache-Start room [1] for mmap file.
> 
> Building Isar on one of the Debian host with kernel 3.4, I got the
> following problem for 'qemuarm64-stretch' configuration:
> 
> 8<--
> Hit:1 http://security.debian.org stretch/updates InRelease
> Ign:2 http://ftp.de.debian.org/debian stretch InRelease
> Hit:3 http://ftp.de.debian.org/debian stretch-updates InRelease
> Hit:4 http://ftp.de.debian.org/debian stretch Release
> E: Dynamic MMap ran out of room. Please increase the size of APT::Cache-Start. Current value: 25165824. (man 5 apt.conf)
> qemu: uncaught target signal 11 (Segmentation fault) - core dumped
> Segmentation fault
> 8<--
> 
> I have no information, why exactly the room could not be re-sized on this
> system, but it would be better to increase the initial room size for apt.
> This patch increases the default apt cache twice.
> 
> Signed-off-by: Alexander Smirnov <asmirnov@ilbers.de>
> ---
>   meta/recipes-core/isar-bootstrap/isar-bootstrap.bb | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/meta/recipes-core/isar-bootstrap/isar-bootstrap.bb b/meta/recipes-core/isar-bootstrap/isar-bootstrap.bb
> index a38dd88..4cdefaa 100644
> --- a/meta/recipes-core/isar-bootstrap/isar-bootstrap.bb
> +++ b/meta/recipes-core/isar-bootstrap/isar-bootstrap.bb
> @@ -187,7 +187,9 @@ do_apt_update() {
>   
>       E="${@bb.utils.export_proxies(d)}"
>       export DEBIAN_FRONTEND=noninteractive
> -    sudo -E chroot "${ROOTFSDIR}" /usr/bin/apt-get update -y
> +    sudo -E chroot "${ROOTFSDIR}" /usr/bin/apt-get update -y \
> +                                      -o APT::Cache-Start=50331648
> +

If this is needed, then it might be better to set this option in a 
apt-preferences file with the "DISTRO_APT_PREFERENCES" variable.

Cheers,
Claudius

>       sudo -E chroot "${ROOTFSDIR}" /usr/bin/apt-get dist-upgrade -y \
>                                         -o Debug::pkgProblemResolver=yes
>   }
> 

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