[pkg-gnupg-maint] Bug#848951: gnupg: Utilize multiple cores on CPU for encryption and decryption (and compression)

[Witold Baryluk]

Package: gnupg
Version: 2.1.16-3
Severity: normal

Feature request.

When using gpg as invoked by duplicity, gpg is a main bottlneck. gpg is
using 100% of single CPU core, and not any more.

Utilizing more cores would speed up backups as done by duplicity, especially
full backups by a factor of 10 on modern machines.

Using cipher and compression algorithms that can utilize multiple cores
(possibly at the expense of using more memory for buffers) would help a
lot.

Thanks.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.8.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnupg depends on:
ii  gnupg-agent    2.1.16-3
ii  libassuan0     2.4.3-2
ii  libbz2-1.0     1.0.6-8
ii  libc6          2.24-8
ii  libgcrypt20    1.7.5-2
ii  libgpg-error0  1.25-2
ii  libksba8       1.3.5-2
ii  libreadline7   7.0-1
ii  libsqlite3-0   3.15.2-1
ii  zlib1g         1:1.2.8.dfsg-4

Versions of packages gnupg recommends:
ii  dirmngr     2.1.16-3
ii  gnupg-l10n  2.1.16-3

Versions of packages gnupg suggests:
pn  parcimonie  <none>
pn  xloadimage  <none>

-- no debconf information