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Implement RemoteStore::queryMissing()

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This provides a significant speedup, e.g. 64 s -> 12 s for

  nix-build --dry-run -I nixpkgs=channel:nixos-16.03 '<nixpkgs/nixos/tests/misc.nix>' -A test

on a cold local and CloudFront cache.

The alternative is to use lots of concurrent daemon connections but
that seems wasteful.
This commit is contained in:
Eelco Dolstra 2017-04-06 18:40:19 +02:00
parent 963f2bf12b
commit ba20730b3f
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5 changed files with 44 additions and 3 deletions
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5
src/libstore/worker-protocol.hh
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@ -6,7 +6,7 @@ namespace nix {
#define WORKER_MAGIC_1 0x6e697863
#define WORKER_MAGIC_2 0x6478696f
#define PROTOCOL_VERSION 0x112
#define PROTOCOL_VERSION 0x113
#define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
#define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)
@ -47,7 +47,8 @@ typedef enum {
wopBuildDerivation = 36,
wopAddSignatures = 37,
wopNarFromPath = 38,
wopAddToStoreNar = 39
wopAddToStoreNar = 39,
wopQueryMissing = 40,
} WorkerOp;