[pve-devel] [PATCH manager 2/2] partially fix #5392: pvedaemon: make number of workers configurable

[Friedrich Weber]

The number of pvedaemon worker processes is currently hardcoded to 3.
This may not be enough for automation-heavy workloads that trigger a
lot of API requests that are synchronously handled by pvedaemon.

Hence, read /etc/default/pvedaemon when starting pvedaemon and allow
overriding the number of workers by specifying MAX_WORKERS in this
file. All other values are only relevant for pveproxy/spiceproxy and
thus ignored.

Signed-off-by: Friedrich Weber <f.weber at proxmox.com>
---

Notes:
    I'm not sure if reading /etc/default/pvedaemon, which was not used
    until now, is a good solution here, but I decided to go for it because
    it seems relatively straightforward and analogous to pveproxy.
    
    Also here, I decided against setting max_workers directly directly in
    %daemon_options, to avoid having to call read_proxy_config already
    then. If I understand correctly, overriding $self->{max_workers} in
    init should be fine because it's only used in PVE::Daemon's
    $server_run after init was called.

 PVE/Service/pvedaemon.pm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/PVE/Service/pvedaemon.pm b/PVE/Service/pvedaemon.pm
index 9d7cbc0f..4493f234 100755
--- a/PVE/Service/pvedaemon.pm
+++ b/PVE/Service/pvedaemon.pm
@@ -15,7 +15,7 @@ use base qw(PVE::Daemon);
 my $cmdline = [$0, @ARGV];
 
 my %daemon_options = (
-    max_workers => 3,
+    max_workers => 3, # may be overridden in init
     restart_on_error => 5,
     stop_wait_time => 15,
     leave_children_open_on_reload => 1,
@@ -26,6 +26,10 @@ my $daemon = __PACKAGE__->new('pvedaemon', $cmdline, %daemon_options);
 sub init {
     my ($self) = @_;
 
+    # all options other than MAX_WORKERS are ignored
+    my $proxyconf = PVE::APIServer::Utils::read_proxy_config($self->{name});
+    $self->{max_workers} = $proxyconf->{MAX_WORKERS} if $proxyconf->{MAX_WORKERS};
+
     my $accept_lock_fn = "/var/lock/pvedaemon.lck";
 
     my $lockfh = IO::File->new(">>${accept_lock_fn}")
-- 
2.47.2