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authorLudovic Courtès <ludo@gnu.org>2016-12-01 22:53:37 +0100
committerLudovic Courtès <ludo@gnu.org>2016-12-01 23:35:10 +0100
commit9a8f9f84cc1672c45c2d204d9c234c932a8cb623 (patch)
treee900669630be57c9f5eac6081b3b903afd674db9 /nix/nix-daemon
parent0b72475301e20521e0dd9fc22881eaab4a7fe170 (diff)
daemon: Buffer data sent to clients by the 'export-path' RPC.
Before that we'd have STDERR_WRITE round trips for very small amounts of data, ranging from a few bytes for the metadata of nars to the size of one file being exported. With this change, something like: guix archive --export /gnu/store/5rrsbaghh5ix1vjcicsl60gsxilhjnf2-coreutils-8.25 | dd of=/dev/null reports a throughput of 35 MB/s instead of 25 MB/s before. * nix/nix-daemon/nix-daemon.cc (TunnelSink): Inherit from 'BufferedSink' rather than 'Sink'. Rename 'operator ()' to 'write'. (performOp) <wopExportPath>: Add 'sink.flush' call.
Diffstat (limited to 'nix/nix-daemon')
-rw-r--r--nix/nix-daemon/nix-daemon.cc7
1 files changed, 4 insertions, 3 deletions
diff --git a/nix/nix-daemon/nix-daemon.cc b/nix/nix-daemon/nix-daemon.cc
index 9b29b3e91d..682f9a2b5b 100644
--- a/nix/nix-daemon/nix-daemon.cc
+++ b/nix/nix-daemon/nix-daemon.cc
@@ -203,11 +203,11 @@ static void stopWork(bool success = true, const string & msg = "", unsigned int
}
-struct TunnelSink : Sink
+struct TunnelSink : BufferedSink
{
Sink & to;
- TunnelSink(Sink & to) : to(to) { }
- virtual void operator () (const unsigned char * data, size_t len)
+ TunnelSink(Sink & to) : BufferedSink(64 * 1024), to(to) { }
+ virtual void write(const unsigned char * data, size_t len)
{
writeInt(STDERR_WRITE, to);
writeString(data, len, to);
@@ -433,6 +433,7 @@ static void performOp(bool trusted, unsigned int clientVersion,
startWork();
TunnelSink sink(to);
store->exportPath(path, sign, sink);
+ sink.flush();
stopWork();
writeInt(1, to);
break;