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authorLudovic Courtès <ludo@gnu.org>2013-01-29 23:53:09 +0100
committerLudovic Courtès <ludo@gnu.org>2013-01-30 00:09:32 +0100
commitbdcf35a6b294c1db7ce78a5550ba51e067863069 (patch)
treef34dd05a0007348f2371a495398620b274f86b46 /guix/store.scm
parent2c3f47ee3a621f20d24ae5c78b1abc0eb00ba445 (diff)
store: Cache `add-text-to-store' results.
* guix/store.scm (<nix-server>)[atts-cache]: New field. (add-text-to-store/cached): New procedure. Use it as a wrapper around `add-text-to-store'. When running "guix-build gdb", this reduces the number of RPCs from 3048 to 289, and execution time from 4.7s to 2.6s.
Diffstat (limited to 'guix/store.scm')
-rw-r--r--guix/store.scm24
1 files changed, 21 insertions, 3 deletions
diff --git a/guix/store.scm b/guix/store.scm
index aa762b667c..f36ebea390 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -293,7 +293,7 @@
(define-record-type <nix-server>
(%make-nix-server socket major minor
- ats-cache)
+ ats-cache atts-cache)
nix-server?
(socket nix-server-socket)
(major nix-server-major-version)
@@ -302,7 +302,8 @@
;; Caches. We keep them per-connection, because store paths build
;; during the session are temporary GC roots kept for the duration of
;; the session.
- (ats-cache nix-server-add-to-store-cache))
+ (ats-cache nix-server-add-to-store-cache)
+ (atts-cache nix-server-add-text-to-store-cache))
(define-condition-type &nix-error &error
nix-error?)
@@ -340,6 +341,7 @@ operate, should the disk become full. Return a server object."
(let ((s (%make-nix-server s
(protocol-major v)
(protocol-minor v)
+ (make-hash-table)
(make-hash-table))))
(let loop ((done? (process-stderr s)))
(or done? (process-stderr s)))
@@ -462,6 +464,22 @@ REFERENCES is the list of store paths referred to by the resulting store
path."
store-path)
+(define add-text-to-store/cached
+ (let ((add-text-to-store add-text-to-store))
+ (lambda (server name text references)
+ "Add TEXT under file NAME in the store, and return its store path.
+REFERENCES is the list of store paths referred to by the resulting store
+path."
+ (let ((args `(,name ,text ,references))
+ (cache (nix-server-add-text-to-store-cache server)))
+ (or (hash-ref cache args)
+ (let ((path (add-text-to-store server name text
+ references)))
+ (hash-set! cache args path)
+ path))))))
+
+(set! add-text-to-store add-text-to-store/cached)
+
(define-operation (add-to-store (string basename)
(boolean fixed?) ; obsolete, must be #t
(boolean recursive?)
@@ -488,7 +506,7 @@ FIXED? is for backward compatibility with old Nix versions and must be #t."
(hash-set! cache args path)
path))))))
-(define add-to-store add-to-store/cached)
+(set! add-to-store add-to-store/cached)
(define-operation (build-derivations (string-list derivations))
"Build DERIVATIONS, and return when the worker is done building them.