Hi -
Planning to commit this shortly.
commit e646e363e72e06e0ed5574c929236d815ddcbbaf (HEAD -> master)
Author: Frank Ch. Eigler <f...@redhat.com>
Date: Sun Apr 3 12:47:17 2022 -0400
PR28708: debuginfod: use MHD_USE_EPOLL for microhttpd threads
Testing on s390x and other architectures indicates that this
configuration reduces thundering-herd wakeups and saturation of a
small number of threads. The run-debuginfod-webapi-concurrency.sh
test appears solid now.
Signed-off-by: Frank Ch. Eigler <f...@redhat.com>
diff --git a/debuginfod/ChangeLog b/debuginfod/ChangeLog
index dfb5d42ec8a5..38a389e7dfd3 100644
--- a/debuginfod/ChangeLog
+++ b/debuginfod/ChangeLog
@@ -1,3 +1,8 @@
+2022-04-03 Frank Ch. Eigler <f...@redhat.com>
+
+ * debuginfod.cxx (main): Use MHD_USE_EPOLL for libmicrohttpd, to
+ encourage more round-robin dispatch of incoming connections.
+
2021-12-09 Alexander Kanavin <a...@linutronix.de>
* debuginfod-client.c (cache_clean_default_interval_s): Change type to
diff --git a/debuginfod/debuginfod.cxx b/debuginfod/debuginfod.cxx
index bb8e8e102896..99924d36f260 100644
--- a/debuginfod/debuginfod.cxx
+++ b/debuginfod/debuginfod.cxx
@@ -3880,6 +3880,9 @@ main (int argc, char *argv[])
| MHD_USE_INTERNAL_POLLING_THREAD
#else
| MHD_USE_SELECT_INTERNALLY
+#endif
+#ifdef MHD_USE_EPOLL
+ | MHD_USE_EPOLL
#endif
| MHD_USE_DEBUG, /* report errors to
stderr */
http_port,
@@ -3894,6 +3897,9 @@ main (int argc, char *argv[])
| MHD_USE_INTERNAL_POLLING_THREAD
#else
| MHD_USE_SELECT_INTERNALLY
+#endif
+#ifdef MHD_USE_EPOLL
+ | MHD_USE_EPOLL
#endif
| MHD_USE_IPv6
| MHD_USE_DEBUG, /* report errors to
stderr */
