X11::Protocol::Ext::X_Resource(3) server resource usage


use X11::Protocol;
my $X = X11::Protocol->new;
or print "X-Resource extension not available";
my @clients = $X->XResourceQueryClients();
my %resources = $X->XResourceQueryClientResources ($client_xid);
my $bytes = $X->XResourceQueryClientPixmapBytes ($client_xid);


The X-Resource extension gives some server resource utilization information, mainly for use as diagnostics.
  • Current client connections and their XID ranges.
  • How many windows, pixmaps, GCs, etc in use by a given client.
  • Total memory used by all the pixmaps of a given client.

``Resources'' here means memory, objects, etc, not to be confused with the resource database of user preferences and widget settings of ``RESOURCES'' in X(7).

See examples/xresource-print.pl in the "X11-Protocol-Other" sources for a simple dump of the resources reported.


The following requests are made available with an "init_extension()", as per ``EXTENSIONS'' in X11::Protocol.

    my $is_available = $X->init_extension('X-Resource');
"($server_major, $server_minor) = $X->XResourceQueryVersion ($client_major, $client_minor)"
Negotiate the extension version. $client_major and $client_minor is what the client would like, the returned $server_major and $server_minor is what the server will do, which might be lower than requested (but not higher).

The current code supports X-Resource 1.0. The intention is for this module to automatically negotiate in "$X->init_extension()" if/when needed.

"@clients = $X->XResourceQueryClients ()"
Return a list of client connections on the server. Each returned value is an arrayref pair

    [ $xid_base, $xid_mask ]

$xid_base (an integer) is the start of XIDs for the client.

$xid_mask (an integer) is a bit mask for the XIDs above that base which the client may use. For example $xid_base might be 0xA00000 and $xid_mask 0x1FFFFF, meaning 0xA00000 through 0xBFFFFF is this client.

    my @clients = $X->XResourceQueryClients;
    print "there are ",scalar(@clients)," clients\n";
    foreach my $aref (@clients) {
      my $xid_base = $aref->[0];
      my $xid_mask = $aref->[1];
      printf "client base %X mask %X\n", $xid_base, $xid_mask;

The given $X connection itself is included in the return. Its base and mask are per "$X->{'resource_id_base'}" and "$X->{'resource_id_mask'}".

"($atom,$count,...) = $X->XResourceQueryClientResources ($xid)"
Return a list of how many of various server things are used by a given client.

The client is identified by an $xid. It can be anything in the client's XID range and doesn't have to be currently allocated or created. For example to enquire about the current client use "$X->{'resource_id_base'}".

The return is a list of resource type (an atom integer) and count of those things,

    ($atom, $count, $atom, $count, ...)

So for example to print all resources,

    my @res = $X->XResourceQueryClientResources ($xid);
    while (@res) {
      my $type_atom = shift @res;
      my $count = shift @res;
      my $type_name = $X->atom_name($type_atom);
      printf "type $type_name count $count\n";

Or put the list into a hash to lookup a particular resource type,

    my %res = $X->XResourceQueryClientResources ($xid);
    my $window_atom = X11::AtomConstants::WINDOW();
    my $windows = $res{$window_atom} || 0;
    my $grab_atom = $X->atom('PASSIVE GRAB');
    my $grabs = $res{$grab_atom} || 'no';
    print "using $windows many windows, and $grabs passive grabs";

"List::Pairwise" has "mapp()" and other things to work with this sort of two-at-a-time list. See examples/xresource-pairwise.pl in the "X11-Protocol-Other" sources for a complete program.

Generally a count entry is only present when the client has 1 or more of the thing. So if no pixmaps then no "PIXMAP" entry at all.

Basics like "WINDOW", "PIXMAP", "GC" "COLORMAP", "FONT" and "CURSOR" are how many of those in use. The server might also report things like "PASSIVE GRAB" or "COLORMAP ENTRY" (atoms with spaces in their names). The X.org server (circa version 1.9) even sometimes reports things like ``Unregistered resource 30'' (an atom with that name), which is something or other.

If the given $xid is not a connected client then a "BadValue" error results. Be careful of that when querying resources of another client since the client might disconnect at any time. "$X->robust_req()" is good, or maybe "GrabServer" to hold connections between "XResourceQueryClients()" and "XResourceQueryClientResources()".

"$bytes = $X->XResourceQueryClientPixmapBytes ($xid)"
Return the total bytes of memory on the server used by all the pixmaps of a given client. Pixmaps which only exist as window backgrounds or GC tiles or stipples are included, or should be. If the client has no pixmaps at all the return is 0.

The client is identified by an $xid as per "XResourceQueryClientResources()" above. It can be anything in the client's XID range, allocated or not.

    my $pixmap = $X->new_rsrc;
    $X->CreatePixmap ($pixmap,
                      100, 100);  # width,height
    my $xid = $X->{'resource_id_base'};  # own usage
    my $bytes = $X->XResourceQueryClientPixmapBytes ($xid);
    print "total of all pixmaps is $bytes bytes of memory\n";

The return is a 64-bit value. On a 32-bit Perl a bigger than 32 bits is returned as floating point, or bigger than 53 bit float as "Math::BigInt". Most of the time 32 bits is enough, since that would be 4 Gbytes of pixmaps, and or 53-bit float should be plenty, that being about 8192 terabytes!

For reference, the X.org server circa version 1.11.4 had a bug where it didn't count space used by pixmaps of depth less than 8 (including depth 1 bitmaps) in the bytes returned.


Copyright 2011, 2012, 2013 Kevin Ryde

X11-Protocol-Other is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

X11-Protocol-Other is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with X11-Protocol-Other. If not, see <http://www.gnu.org/licenses/>.