Add TasksMax=infinity option to .service files if systemd version >= 227

Bug 3526

etc/Makefile.am

@@ -8,7 +8,8 @@ edit = sed \
         -e 's|@libdir[@]|$(libdir)|g' \
         -e 's|@sbindir[@]|$(sbindir)|g' \
         -e 's|@sysconfdir[@]|$(sysconfdir)|g' \
-	-e 's|@BLUEGENE_LOADED_FALSE[@]|$(BLUEGENE_LOADED_FALSE)|g'
+	-e 's|@BLUEGENE_LOADED_FALSE[@]|$(BLUEGENE_LOADED_FALSE)|g' \
+	-e 's|@SYSTEMD_TASKSMAX_OPTION[@]|$(SYSTEMD_TASKSMAX_OPTION)|g'
 
 noinst_DATA = $(ETC_FILES)
 

etc/slurmctld.service.in

@@ -9,6 +9,7 @@ EnvironmentFile=-/etc/sysconfig/slurmctld
 ExecStart=@sbindir@/slurmctld $SLURMCTLD_OPTIONS
 ExecReload=/bin/kill -HUP $MAINPID
 PIDFile=/var/run/slurmctld.pid
+@SYSTEMD_TASKSMAX_OPTION@
 
 [Install]
 WantedBy=multi-user.target

etc/slurmd.service.in

@@ -13,6 +13,7 @@ KillMode=process
 LimitNOFILE=51200
 LimitMEMLOCK=infinity
 LimitSTACK=infinity
+@SYSTEMD_TASKSMAX_OPTION@
 
 [Install]
 WantedBy=multi-user.target

etc/slurmdbd.service.in

@@ -9,6 +9,7 @@ EnvironmentFile=-/etc/sysconfig/slurmdbd
 ExecStart=@sbindir@/slurmdbd $SLURMDBD_OPTIONS
 ExecReload=/bin/kill -HUP $MAINPID
 PIDFile=/var/run/slurmdbd.pid
+@SYSTEMD_TASKSMAX_OPTION@
 
 [Install]
 WantedBy=multi-user.target