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* [PATCH] reduce syscalls in recvmsg invocations
@ 2014-12-22  1:12  7% Eric Wong
  0 siblings, 0 replies; 2+ results
From: Eric Wong @ 2014-12-22  1:12 UTC (permalink / raw)
  To: dtas-all; +Cc: Eric Wong

Favor IO.select over IO#wait since the latter makes another
ioctl syscall (which we'll make anyways for IO#nread).

Having BasicSocket#recvmsg and recvmsg_nonblock detect the buffer
size requires extra syscalls, so pass explict maxmesglen, flags, and
maxcontrollen args to elide auto-detection since we already have the
buffered amount from IO#nread.

This cuts more syscalls from the "dtas-tl cat" invocation with
larger tracklists.
---
 lib/dtas/unix_accepted.rb | 2 +-
 lib/dtas/unix_client.rb   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/dtas/unix_accepted.rb b/lib/dtas/unix_accepted.rb
index 2c82d2a..3008afc 100644
--- a/lib/dtas/unix_accepted.rb
+++ b/lib/dtas/unix_accepted.rb
@@ -56,7 +56,7 @@ class DTAS::UNIXAccepted # :nodoc:
 
     begin
       begin
-        msg, _, _ = io.recvmsg_nonblock(nread)
+        msg, _, _ = io.recvmsg_nonblock(nread, 0, 0)
       rescue Errno::EAGAIN
         return :wait_readable
       rescue EOFError, SystemCallError
diff --git a/lib/dtas/unix_client.rb b/lib/dtas/unix_client.rb
index 40dedcc..7382ea6 100644
--- a/lib/dtas/unix_client.rb
+++ b/lib/dtas/unix_client.rb
@@ -38,9 +38,9 @@ class DTAS::UNIXClient # :nodoc:
   end
 
   def res_wait(timeout = nil)
-    @to_io.wait(timeout)
+    IO.select([@to_io], nil, nil, timeout)
     nr = @to_io.nread
     nr > 0 or raise EOFError, "unexpected EOF from server"
-    @to_io.recvmsg[0]
+    @to_io.recvmsg(nr, 0, 0)[0]
   end
 end
-- 
EW



^ permalink raw reply related	[relevance 7%]

* [ANN] dtas 0.9.0 - duct tape audio suite for *nix
@ 2014-12-22  9:26  5% Eric Wong
  0 siblings, 0 replies; 2+ results
From: Eric Wong @ 2014-12-22  9:26 UTC (permalink / raw)
  To: ruby-talk, dtas-all

Free Software command-line tools for audio playback, mastering, and
whatever else related to audio.  dtas follows the worse-is-better
philosophy and acts as duct tape to combine existing command-line tools
for flexibility and ease-of-development.  dtas is currently implemented
in Ruby (and some embedded shell), but may use other languages in the
future.

Changes:

   dtas 0.9.0 - minor features and speedups

   The major new feature is '>' and '<' keys are now supported
   in the dtas-console interface for dtas-player.
    dtas-tl cat" also received a minor speedup for big tracklists
   via syscall reductions

   shortlog of changes since 0.8.0:

         process: update comment for bug workaround
         process: update comment for bug workaround #2
         compat_onenine: simplify pipe wrapper
         tracklist: favor &:sym_to_proc style
         dtas-console: '>' and '<' keys for tracklist next/prev
         dtas-tl: halve write() syscalls when emitting tracklists
         reduce syscalls in recvmsg invocations
         doc: flesh out "tl" subcommand docs

   The best is yet to come!

* http://dtas.80x24.org/README
* http://dtas.80x24.org/INSTALL
* http://dtas.80x24.org/dtas-player.txt
* http://dtas.80x24.org/NEWS
* git clone git://80x24.org/dtas
* dtas-all@nongnu.org (plain-text only, no HTML mail, please)
* http://80x24.org/dtas-all/

* http://dtas.80x24.org/2014/dtas-0.9.0.tar.gz
  SHA-1 edbd256f4653eed70a52ee972e0e7b2e781fdfdf

* http://dtas.80x24.org/2014/dtas-0.9.0.gem
  SHA-1 41330a9374a2172482b85f27082a5624b72b30cd

-- 
EW


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