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* [PATCH] http_server: save 450+ bytes of memory on x86-64
@ 2014-11-27 22:46 Eric Wong
  0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2014-11-27 22:46 UTC (permalink / raw)
  To: unicorn-public

Replacing the Regexp argument to a rarely-called String#split with a
literal String can save a little memory.  The removed Regexp memsize
is 469 bytes on Ruby 2.1:

	ObjectSpace.memsize_of(/,/) => 469

Is slightly smaller at 453 bytes on 2.2.0dev (r48474).
These numbers do not include the 40-byte object overhead.

Nevertheless, this is a waste for non-performance-critical code
during the socket inheritance phase.  A literal string has less
overhead at 88 bytes:

	* 48 bytes for table entry in the frozen string table
	* 40 bytes for the object itself

The downside of using a literal string for the String#split argument
is a 40-byte string object gets allocated on every call, but this
piece of code is only called once in a process lifetime.
 lib/unicorn/http_server.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index 819a0a8..69bf362 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -770,7 +770,7 @@ class Unicorn::HttpServer
   def inherit_listeners!
     # inherit sockets from parents, they need to be plain Socket objects
     # before they become Kgio::UNIXServer or Kgio::TCPServer
-    inherited = ENV['UNICORN_FD'].to_s.split(/,/).map do |fd|
+    inherited = ENV['UNICORN_FD'].to_s.split(',').map do |fd|
       io = Socket.for_fd(fd.to_i)
       set_server_sockopt(io, listener_opts[sock_name(io)])

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2014-11-27 22:46 [PATCH] http_server: save 450+ bytes of memory on x86-64 Eric Wong

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