[bug#48806] [PATCH 0/7] Generalized cache support and improved graft caching

[Ludovic Courtès]

Hi!

This patch series allows us to dynamically allocate per-store-connection
caches, such that subsequently created <store-connection> records
can have the newly allocated caches.

So far there were a couple of per-connection caches; for anything else,
we’d resort to global hash tables.  That’s not great because those caches
are usually valid only for one connection to a store, and only for the
duration of that session.  This new feature addresses that.

The last patch uses it to have session-wide caches mapping derivations
to applicable grafts, which partly addresses the performance problems
described in <https://issues.guix.gnu.org/41702>.

Feedback welcome, including performance reports!

Thanks,
Ludo’.

Ludovic Courtès (7):
  store: Support dynamic allocation of per-connection caches.
  store: Generalize cache lookup recording.
  grafts: Record cache lookups for profiling.
  grafts: Use SRFI-71 instead of SRFI-11.
  store: Remove 'references/substitutes'.
  store: 'references/cached' now uses a per-session cache.
  grafts: Cache the derivation/graft mapping for the whole session.

 guix/grafts.scm |  56 ++++++++-----
 guix/store.scm  | 205 ++++++++++++++++++++++++++----------------------
 tests/store.scm |  36 ---------
 3 files changed, 150 insertions(+), 147 deletions(-)

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2.31.1