debuginfod: Use auto-sized connection pool when -C is not given with arg

Since commit 4b42d9ad, libmicrohttpd's epoll event loop is used when
available in which case we must disable its setting for spawning a thread
per request.  This contradicts the debuginfod doc's description of '-C',
which indicates that if this command line option is not given then the
thread pool size is unbounded.

Fix this by using an auto-sized thread pool when '-C' is not given, just
as we do when it's given with no argument. Update the doc's description
of '-C'.

Also use a fixed-size pool even if epoll is not supported. The unbounded
pool config cannot be considered entirely reliable as it appears to cause
random fails in the run-debuginfod-webapi-concurrency test.

Signed-off-by: Aaron Merey <amerey@redhat.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/doc/debuginfod.8 b/doc/debuginfod.8
index 50fce7f5..7c1dc3dd 100644
--- a/doc/debuginfod.8
+++ b/doc/debuginfod.8
@@ -212,15 +212,13 @@ following table summarizes the interpretaton of this option and its
 optional NUM parameter.
 .TS
 l l.
-no option	clone new thread for every request, no fixed pool
-\-C	use a fixed thread pool sized automatically
+no option, \-C	use a fixed thread pool sized automatically
 \-C=NUM	use a fixed thread pool sized NUM, minimum 2
 .TE
 
-The first mode is useful for friendly bursty traffic.  The second mode
-is a simple and safe configuration based on the number of processors.
-The third mode is suitable for tuned load-limiting configurations
-facing unruly traffic.
+The first mode is a simple and safe configuration based on the number
+of processors. The second mode is suitable for tuned load-limiting
+configurations facing unruly traffic.
 
 .TP
 .B "\-L"