08-01-2013
I wouldn't consider 20% CPU usage high for a web server. I'd even say it's quite low.
Of course increasing the traffic will also increase resource consumption.
I'm not sure what exactly is the issue you're facing, but there are several tools that may help you get an overview of how system resources are being used: top, free, nmon, sar, vmstat, etc.
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LEARN ABOUT DEBIAN
xkbvirtualmodstoreal
XkbVirtualModsToReal(3) XKB FUNCTIONS XkbVirtualModsToReal(3)
NAME
XkbVirtualModsToReal - Determines the mapping of virtual modifiers to core X protocol modifiers
SYNOPSIS
Bool XkbVirtualModsToReal (XkbDescPtr xkb, unsigned int virtual_mask, unsigned int *mask_rtrn);
ARGUMENTS
- xkb keyboard description for input device
- virtual_mask
virtual modifier mask to translate
- mask_rtrn
backfilled with real modifiers
DESCRIPTION
Xkb maintains a virtual modifier mapping, which lists the virtual modifiers associated with, or bound to, each key. The real modifiers
bound to a virtual modifier always include all of the modifiers bound to any of the keys that specify that virtual modifier in their vir-
tual modifier mapping. The server.vmodmap array indicates which virtual modifiers are bound to each key; each entry is a bitmask for the
virtual modifier bits. The server.vmodmap array is indexed by keycode.
The vmodmap and vmods members of the server map are the "master" virtual modifier definitions. Xkb automatically propagates any changes to
these fields to all other fields that use virtual modifier mappings.
For example, if Mod3 is bound to the Num_Lock key by the core protocol modifier mapping, and the NumLock virtual modifier is bound to they
Num_Lock key by the virtual modifier mapping, Mod3 is added to the set of modifiers associated with NumLock.
The virtual modifier mapping is normally updated whenever actions are automatically applied to symbols and few applications should need to
change the virtual modifier mapping explicitly.
Use XkbGetMap to get the virtual modifiers from the server or use XkbGetVirtualMods to update a local copy of the virtual modifiers bind-
ings from the server. To set the binding of a virtual modifier to a real modifier, use XkbGetVirtualMods
If the keyboard description defined by xkb includes bindings for virtual modifiers, XkbVirtualModsToReal uses those bindings to determine
the set of real modifiers that correspond to the set of virtual modifiers specified in virtual_mask. The virtual_mask parameter is a mask
specifying the virtual modifiers to translate; the i-th bit (0 relative) of the mask represents the i-th virtual modifier. If mask_rtrn is
non-NULL, XkbVirtualModsToReal backfills it with the resulting real modifier mask. If the keyboard description in xkb does not include vir-
tual modifier bindings, XkbVirtualModsToReal returns False; otherwise, it returns True.
RETURN VALUES
True The XkbVirtualModsToReal function returns True if the keyboard description in xkb does include virtual modifier bindings.
False The XkbVirtualModsToReal function returns False if the keyboard description in xkb does not include virtual modifier bind-
ings.
SEE ALSO
XkbGetMap(3), XkbGetVirtualMods(3)
NOTES
It is possible for a local (client-side) keyboard description (the xkb parameter) to not contain any virtual modifier information (simply
because the client has not requested it) while the server's corresponding definition may contain virtual modifier information.
X Version 11 libX11 1.5.0 XkbVirtualModsToReal(3)