This script simply increments a counter for each different request made, and when you exit the script (such as by hitting Control+C) prints the counts.

#!/usr/sbin/dtrace -s

Xserver*:::request-start
{
    @counts[copyinstr(arg0)] = count();
}
	

The output from a short run may appear as:

  QueryPointer                                                      1
  CreatePixmap                                                      2
  FreePixmap                                                        2
  PutImage                                                          2
  ChangeGC                                                         10
  CopyArea                                                         10
  CreateGC                                                         14
  FreeGC                                                           14
  RENDER                                                           28
  SetClipRectangles                                                40
	

This can be rewritten slightly to cache the string containing the name of the request since it will be reused many times, instead of copying it over and over from the kernel:

#!/usr/sbin/dtrace -s

string Xrequest[uintptr_t];

Xserver*:::request-start
/Xrequest[arg0] == ""/
{
    Xrequest[arg0] = copyinstr(arg0);
}

Xserver*:::request-start
{
    @counts[Xrequest[arg0]] = count();
}
	

This script records the CPU time used between the probes at the start and end of each request and aggregates it per request type.

#!/usr/sbin/dtrace -s

Xserver*:::request-start
{
    reqstart = vtimestamp;
}

Xserver*:::request-done
{
    @times[copyinstr(arg0)] = avg(vtimestamp - reqstart);
}
	

The output from a sample run might look like:

  ChangeGC                                                        889
  MapWindow                                                       907
  SetClipRectangles                                              1319
  PolyPoint                                                      1413
  PolySegment                                                    1434
  PolyRectangle                                                  1828
  FreeCursor                                                     1895
  FreeGC                                                         1950
  CreateGC                                                       2244
  FreePixmap                                                     2246
  GetInputFocus                                                  2249
  TranslateCoords                                                8508
  QueryTree                                                      8846
  GetGeometry                                                    9948
  CreatePixmap                                                  12111
  AllowEvents                                                   14090
  GrabServer                                                    14791
  MIT-SCREEN-SAVER                                              16747
  ConfigureWindow                                               22917
  SetInputFocus                                                 28521
  PutImage                                                     240841

	

This script simply prints information about each client that connects or disconnects from the server while it is running. Since the provider is specified as Xserver$1 instead of Xserver* like previous examples, it won't monitor all Xserver processes running on the machine, but instead expects the process id of the X server to monitor to be specified as the argument to the script.

#!/usr/sbin/dtrace -s

Xserver$1:::client-connect
{
	printf("** Client Connect: id %d\n", arg0);
}

Xserver$1:::client-auth
{
	printf("** Client auth'ed: id %d => %s pid %d\n",
		arg0, copyinstr(arg1), arg2);
}

Xserver$1:::client-disconnect
{
	printf("** Client Disconnect: id %d\n", arg0);
}
	

A sample run:

# ./foo.d 5790
dtrace: script './foo.d' matched 4 probes
CPU     ID                    FUNCTION:NAME
  0  15774 CloseDownClient:client-disconnect ** Client Disconnect: id 65

  2  15774 CloseDownClient:client-disconnect ** Client Disconnect: id 64

  0  15773 EstablishNewConnections:client-connect ** Client Connect: id 64

  0  15772            AuthAudit:client-auth ** Client auth'ed: id 64 => local host pid 2034

  0  15773 EstablishNewConnections:client-connect ** Client Connect: id 65

  0  15772            AuthAudit:client-auth ** Client auth'ed: id 65 => local host pid 2034

  0  15774 CloseDownClient:client-disconnect ** Client Disconnect: id 64
	  
	

This script can be used to determine which clients are creating pixmaps in the X server, printing information about each client as it connects to help trace it back to the program on the other end of the X connection.

#!/usr/sbin/dtrace -qs

string Xrequest[uintptr_t];
string Xrestype[uintptr_t];

Xserver$1:::request-start
/Xrequest[arg0] == ""/
{
	Xrequest[arg0] = copyinstr(arg0);
}

Xserver$1:::resource-alloc
/arg3 != 0 && Xrestype[arg3] == ""/
{
	Xrestype[arg3] = copyinstr(arg3);
}


Xserver$1:::request-start
/Xrequest[arg0] == "X_CreatePixmap"/
{
	printf("-> %s: client %d\n", Xrequest[arg0], arg3);
}

Xserver$1:::request-done
/Xrequest[arg0] == "X_CreatePixmap"/
{
	printf("<- %s: client %d\n", Xrequest[arg0], arg3);
}

Xserver$1:::resource-alloc
/Xrestype[arg3] == "PIXMAP"/
{
	printf("** Pixmap alloc: %08x\n", arg0);
}


Xserver$1:::resource-free
/Xrestype[arg3] == "PIXMAP"/
{
	printf("** Pixmap free:  %08x\n", arg0);
}

Xserver$1:::client-connect
{
	printf("** Client Connect: id %d\n", arg0);
}

Xserver$1:::client-auth
{
	printf("** Client auth'ed: id %d => %s pid %d\n",
		arg0, copyinstr(arg1), arg2);
}

Xserver$1:::client-disconnect
{
	printf("** Client Disconnect: id %d\n", arg0);
}
	

Sample output from a run of this script:

** Client Connect: id 17
** Client auth'ed: id 17 => local host pid 20273
-> X_CreatePixmap: client 17
** Pixmap alloc: 02200009
<- X_CreatePixmap: client 17
-> X_CreatePixmap: client 15
** Pixmap alloc: 01e00180
<- X_CreatePixmap: client 15
-> X_CreatePixmap: client 15
** Pixmap alloc: 01e00181
<- X_CreatePixmap: client 15
-> X_CreatePixmap: client 14
** Pixmap alloc: 01c004c8
<- X_CreatePixmap: client 14
** Pixmap free:  02200009
** Client Disconnect: id 17
** Pixmap free:  01e00180
** Pixmap free:  01e00181