Changeset 8a58afd

Timestamp:

12/07/18 16:46:53 (2 years ago)

Author:

Shane Alcock <salcock@…>

Branches:

develop

Children:

c337c9f9

Parents:

1dc033a

Message:

format_ndag: only call FD_ZERO if we're going to use the fd set

A surprising amount of our "receive" workload is calling FD_ZERO
when, most of the time, our buffers contain enough packets that we
never need to call select() anyway.

File:

• lib/format_ndag.c (modified) (2 diffs)

lib/format_ndag.c

@@ -1050 +1050 @@
         gottime = 0;
 
-        FD_ZERO(&fds);
-
         if (rt->maxfd == -1) {
                 return 0;
@@ -1076 +1074 @@
                 }
 #endif
+                if (maxfd == 0) {
+                        FD_ZERO(&fds);
+                }
                 FD_SET(rt->sources[i].sock, &fds);
                 if (maxfd < rt->sources[i].sock) {