Questions[proc](ubuntu)

I've installed Ubuntu Bionic on an HP Probook 470 G5 with an i7-8550U CPU.

But in /proc/cpuinfo I see:

siblings: 1
cpu cores: 1

I believe I should see:

siblings: 8
cpu cores: 4

If I'm right, what can I do to change this?

EDIT:
Output of lscpu:

Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              1
On-line CPU(s) list: 0
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               142
Model name:          Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
Stepping:            10
CPU MHz:             799.999
CPU max MHz:         1800,0000
CPU min MHz:         400,0000
BogoMIPS:            3984.00
Virtualization:      VT-x
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            8192K
NUMA node0 CPU(s):   0
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves ibpb ibrs stibp dtherm arat pln pts hwp hwp_notify hwp_act_window hwp_epp

everyone

I need to know the exact meaning of every field in /proc/stat file. I read man proc and it only lists several common fields in various architecture and I find in Ubuntu, it includes several other fields in cpu row.

the below is output in my system and cpu rows contain up to 10 columns while the manual only gives 8 column definitions. Furthermore, I can't match the order of columns between my output and the manual.

cpu  606833 402 200307 3888129 69330 0 2702 0 18958 0
cpu0 305810 176 95771 1937157 42348 0 2581 0 9824 0
cpu1 301023 226 104535 1950972 26982 0 121 0 9134 0
intr 52047763 122 2 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1134857 0 0 444732 0 0 0 307878 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 52 8016227 602 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ctxt 91496615
btime 1334106197
processes 27829
procs_running 1
procs_blocked 0
softirq 8764373 0 5353481 964 133618 444766 0 560785 671622 2332 1596805

Thanks

I want a machine that loses power to automatically reboot when power is available. I've looked around and haven't found a solution that works for 11.04.

Purportedly at one point you could do:

echo 'server_mode=1' > /proc/pmu/options

However, my install doesn't have a /proc/pmu folder. I assume this is still possible, where is the setting available?

EDIT:

If this isn't possible from the OS, is there a way to script these sorts of changes to BIOS or is this something that requires physical access to the machine on boot to manually edit the settings?.

On a multi user system, I want to measure each user's CPU usage in seconds of cpu time. For the purpose of this measurement, I assume that if a PID belongs to a user, this user is causing the CPU time - that is I'm ignoring daemons and the kernel.

Currently I'm doing this, every five seconds:

1. Get each user and the PIDs they are running via ps aux
2. For each PID, get x, the sum of utime, cutime, stime and cstime from /proc/[pid]/stat
3. calculate t = x / interval (interval isn't always exactly 5 seconds when there's high load)

If I run this, I get sensible looking values. For instance: A user on this system was spinning in python (while True: pass), and the system was showing round about 750 milliseconds of CPU time per second. When the system hung for a bit, it reported 1600ms for one 1-second inverval. Which seems about right, but I undestand that these values can be deceiptful, especially given I don't really understand them.

So my question is this:

What is a fair and correct way to measure CPU load on a per-user basis?

The method has to be rather accurate. There might be many hundreds of users on this system, so extracting percentages from ps aux will not be accurate enough, especially for short-lived threads which many pieces of software like to spawn.

While this might be complicated, I absolutely know it's possible. This was my starting point:

The kernel keeps track of a processes creation time as well as the CPU time that it consumes during its lifetime. Each clock tick, the kernel updates the amount of time in jiffies that the current process has spent in system and in user mode. — (from the Linux Documentation Project)

The value I'm after is the amount of seconds (or jiffies) that a user has spend on the CPU, not a percentage of system load or cpu usage.

It's important that we measure CPU time while the processes are still running. Some processes will only last for half a second, some will last for many months - and we need to catch both sorts, so that we can account for users' CPU time with fine granularity.

I have noticed so keyboard/mouse hanging and other issues since I bought my new computer and installed Ubuntu 11.10.

I researched where increasing the /proc/sys/kernel/random/entropy_avail helps and it does.

Currently I do this by running $ ls -R / in a terminal. Of course this just reads the directory and files.

It does in fact raise it to 4000 plus. Then it drops back down to 300 and 400.

After looking and trying to find a solution, how can I increase the entrophy_avail without manually LSing the hard drives from the terminal?

I must confess that I have been using Ubuntu full time since 8.04 and Windows completely free since Natty. I don't really understand this entropy_avail but my computer seems to do better when it is high at peak usage.