Pidstat return CPU > 100% for a process even after -I switch is used

[couponinvent]

I am using pidstat (sysstat) to calculate %cpu on my amazon ec2 machine(Debian 8) for performance monitoring. There are 2 issues with it:

1. For most cpu consuming process pidstat -u results into more cpu(even more than the total %cpu consumed by the machine)
2. It also reports cpu more than 100% for a processor even after i have used -I switch.

10:56:51 AM   UID       PID    %usr %system  %guest    %CPU   CPU  Command  
10:56:52 AM     0       922   39.00   18.00    0.00    9.42     2  xxx   
10:56:52 AM     0       924    2.00    0.00    0.00    0.33     0  xxx    
10:56:52 AM     0       927  554.00   68.00    0.00  102.81     2  xxx  

[couponinvent]

@sysstat Can you please help me with this

[sysstat]

Please could you give more details (like the version of pidstat you are using)?

[couponinvent]

@sysstat It is the latest version, i installed sysstat using apt-get install sysstat.

[sysstat]

Please tell me the exact version (output of pidstat -V).

[delta160]

pidstat and multithreaded processes
I contend that the CPU usage for the process ought to be the sum of CPU usage for all threads
[omex_sys_hkex@pgencng106 ~]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)
[omex_sys_hkex@pgencng106 ~]$ rpm -qa | grep sysstat
sysstat-10.1.5-11.el7.x86_64
[omex_sys_hkex@pgencng106 ~]$ pidstat -V
sysstat version 10.1.5
(C) Sebastien Godard (sysstat orange.fr)
[omex_sys_hkex@pgencng106 ~]$ pidstat -h -u -t -p 8677 1 2
Linux 3.10.0-514.10.2.el7.x86_64 (pgencng106) 12/11/17 x86_64 (16 CPU)

Time UID TGID TID %usr %system %guest %CPU CPU Command

1512983762 20200 8677 0 100.00 36.00 0.00 100.00 13 dsf_processor
1512983762 20200 0 8677 83.00 18.00 0.00 100.00 13 |__dsf_processor
1512983762 20200 0 8682 1.00 0.00 0.00 1.00 8 |__dsf_processor
1512983762 20200 0 8683 0.00 0.00 0.00 0.00 0 |__dsf_processor
1512983762 20200 0 8684 82.00 17.00 0.00 99.00 12 |__dsf_processor

Time UID TGID TID %usr %system %guest %CPU CPU Command

1512983763 20200 8677 0 100.00 35.00 0.00 100.00 13 dsf_processor
1512983763 20200 0 8677 83.00 17.00 0.00 100.00 13 |__dsf_processor
1512983763 20200 0 8682 0.00 1.00 0.00 1.00 8 |__dsf_processor
1512983763 20200 0 8683 0.00 0.00 0.00 0.00 0 |__dsf_processor
1512983763 20200 0 8684 83.00 18.00 0.00 100.00 12 |__dsf_processor

Now it seems that the process is only "charged" for what the first thread is using ( this program has two threads intentionally spinning 100% ) I would like to se 201% as %CPU for the process, unless -I is specified , when it should be 201/16 % in this case

[sysstat]

Please also refer to #73.