This appears to be a setting in glibtop/cpu.h:
https://developer.gnome.org/libgtop/stable/libgtop-cpu.html#GLIBTOP-
NCPU:CAPS which becomes an array size and only GLIBTOP_NCPU are
gathered.
>From the source package: libgtop2:
cat -n
...
53 /* Nobody should really be using more than 4 processors.
54 Yes we are :)
55 Nobody should really be using more than 32 processors.
56 */
57 #define GLIBTOP_NCPU 32
58
59 typedef struct _glibtop_cpu glibtop_cpu;
60
61 struct _glibtop_cpu
62 {
63 guint64 flags;
64 guint64 total; /* GLIBTOP_CPU_TOTAL
*/
65 guint64 user; /* GLIBTOP_CPU_USER
*/
66 guint64 nice; /* GLIBTOP_CPU_NICE
*/
67 guint64 sys; /* GLIBTOP_CPU_SYS
*/
68 guint64 idle; /* GLIBTOP_CPU_IDLE
*/
69 guint64 iowait; /* GLIBTOP_CPU_IOWAIT
*/
70 guint64 irq; /* GLIBTOP_CPU_IRQ
*/
71 guint64 softirq; /* GLIBTOP_CPU_SOFTIRQ
*/
72 guint64 frequency; /*
GLIBTOP_CPU_FREQUENCY */
73 guint64 xcpu_total [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_TOTAL
*/
74 guint64 xcpu_user [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_USER
*/
75 guint64 xcpu_nice [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_NICE
*/
76 guint64 xcpu_sys [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_SYS
*/
77 guint64 xcpu_idle [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_IDLE
*/
78 guint64 xcpu_iowait [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_IOWAIT
*/
79 guint64 xcpu_irq [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_IRQ
*/
80 guint64 xcpu_softirq [GLIBTOP_NCPU]; /* GLIBTOP_XCPU_SOFTIRQ
*/
81 guint64 xcpu_flags; /* GLIBTOP_XCPU_IDLE
*/
82 };
83
...
So, in short, System Monitor is not designed to be the official reference for
CPU counts.
I've filed a bug against the Ubuntu/Debian package.
Running gnome on a 64 core machine is a bit odd--they are typically used as
headless servers.
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https://bugs.launchpad.net/bugs/1210280
Title:
System monitor reporting incorrect number of processors for Ubuntu
13.10 vms on Hyper-V
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