Login or Register to Ask a Question and Join Our Community

Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

wdmd(8) [debian man page]

WDMD(8) 						      System Manager's Manual							   WDMD(8)

NAME

       wdmd - watchdog multiplexing daemon

SYNOPSIS

       wdmd [OPTIONS]

DESCRIPTION

       This  daemon opens /dev/watchdog and allows multiple independent sources to detmermine whether each KEEPALIVE is done.  Every test interval
       (10 seconds), the daemon tests each source.  If any test fails, the KEEPALIVE is not done.  In a standard configuration, the watchdog timer
       will  reset the system if no KEEPALIVE is done for 60 seconds ("fire timeout").	This means that if single test fails 5-6 times in row, the
       watchdog will fire and reset the system.  With multiple test sources, fewer separate failures back to back can also cause a reset, e.g.

       T seconds, P pass, F fail
       T00: test1 P, test2 P, test3 P: KEEPALIVE done
       T10: test1 F, test2 F, test3 P: KEEPALIVE skipped
       T20: test1 F, test2 P, test3 P: KEEPALIVE skipped
       T30: test1 P, test2 F, test3 P: KEEPALIVE skipped
       T40: test1 P, test2 P, test3 F: KEEPALIVE skipped
       T50: test1 F, test2 F, test3 P: KEEPALIVE skipped
       T60: test1 P, test2 F, test3 P: KEEPALIVE skipped
       T60: watchdog fires, system resets

       (Depending on timings, the system may be reset sometime shortly before T60, and the tests at T60 would not be run.)

       A crucial aspect to the design and function of wdmd is that if any single source does not pass tests for the fire timeout, the watchdog	is
       guaranteed  to fire, regardless of whether other sources on the system have passed or failed.  A spurious reset due to the combined effects
       of multiple failing tests as shown above, is an accepted side effect.

       wdmd will exit if a watchdog driver is not loaded.

       wdmd cannot be used on the system with any other program that needs to open /dev/watchdog, e.g. watchdog(8).

   Test Source: clients
       Using libwdmd, programs connect to wdmd via a unix socket, and send regular messages to wdmd to update an expiry time for their connection.
       Every test interval, wdmd will check if the expiry time for a connection has been reached.  If so, the test for that client fails.

       (Other test sources such as scripts executed each test interval may be added in the future.)

OPTIONS

       -D     Enable debugging to stderr and don't fork.

       -H num Enable (1) or disable (0) high priority features such as realtime scheduling priority and mlockall.
	      Default 1.

								    2011-08-01								   WDMD(8)

Check Out this Related Man Page

rendercheck(1)						      General Commands Manual						    rendercheck(1)

NAME

       rendercheck - simple tests of the X Render extension.

SYNOPSIS

       rendercheck [-d|--display display] [-i|--iter] [--sync] [-t|--tests test1,test2,test3,...] [-o|--ops op1,op2,op3,...]
       [-v|--verbose] [--minimalrendering]

DESCRIPTION

       rendercheck is a set of simple tests of the X Render extension.	It is designed for authors of Render implementations in X Servers.

OPTIONS

       -d|--display display
	      Specifies the display to test against.

       -i|--iter iterations
	      Specifies  the number of times to repeat each operation before sampling results.	Some X Servers may behave differently (hardware vs
	      software rendering paths) depending on the previous operations done, so this may be used to influence the server's choices.

       --sync Enables synchronous xlib operation, for debugging.

       -t|--tests test1,test2,test3...
	      Enables only a specific subset of the possible tests.  Test names include  fill,	dcoords,  scoords,  mcoords,  tscoords,  tmcoords,
	      blend, composite, cacomposite, gradients, repeat, triangles, and bug7366.  Names must be separated by commas and have no spaces.

       -f|--formats format1,format2,format3...
	      Enables  only  a	specific  subset  of the possible formats.  Only formats listed in the server-supported format list are available.
	      Names must be separated by commas and have no spaces.

       -o|--ops
	      Enables only a specific subset of the Render operators.

       -v|--verbose
	      Enables verbose printing of information on tests run, and successes and failures.

       --minimalrendering
	      Disables copying of offscreen destinations to the window, which is on by default to provide the user with visual feedback.

BUGS

       Several	limitations  are  documented  in  the  TODO  file  accompanying  the  source.	Please	report	any  further  bugs  you  find	to
       http://bugs.freedesktop.org/.

AUTHORS

       Eric Anholt, with help from Keith Packard.

																    rendercheck(1)
Man Page