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Description of problem:
' pidstat -I ' do not report %usr correctly with multithread program such as pigz.
It always output %usr=100% when cpu usage is more than 100%*1cpu.
Version-Release number of selected component (if applicable):
sysstat-10.1.5-18.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. yum install pigz
( need epel-7 enabled )
2. cat /dev/zero | pigz -p 4 > /dev/null &
3. pidstat -I -p $(pgrep pigz) 1
Actual results:
~]$ sysstat-10.1.5-18.el7.x86_64/usr/bin/pidstat -I -p $(pgrep pigz) 1
Linux 3.10.0-957.12.2.el7.x86_64 (bjzw_112_157) 10/21/2019 _x86_64_ (6 CPU)
12:34:40 PM UID PID %usr %system %guest %CPU CPU Command
12:34:41 PM 1003 20645 100.00 19.00 0.00 73.99 5 pigz
12:34:42 PM 1003 20645 100.00 18.00 0.00 75.04 5 pigz
12:34:43 PM 1003 20645 100.00 22.00 0.00 75.80 5 pigz
12:34:44 PM 1003 20645 100.00 16.00 0.00 74.87 5 pigz
12:34:45 PM 1003 20645 100.00 19.00 0.00 75.08 5 pigz
Expected results:
~]$ sysstat-10.1.5-7.el7.x86_64/usr/bin/pidstat -I -p $(pgrep pigz) 1
Linux 3.10.0-957.12.2.el7.x86_64 (bjzw_112_157) 10/21/2019 _x86_64_ (6 CPU)
12:35:35 PM UID PID %usr %system %guest %CPU CPU Command
12:35:36 PM 1003 21829 429.00 17.00 0.00 75.21 0 pigz
12:35:37 PM 1003 21829 429.00 17.00 0.00 74.96 0 pigz
12:35:38 PM 1003 21829 432.00 20.00 0.00 75.84 0 pigz
12:35:39 PM 1003 21829 424.00 19.00 0.00 74.58 0 pigz
Additional info:
sysstat-10.1.5-7.el7.x86_64 works correctly.
Comment 4RHEL Program Management
2021-04-21 07:31:17 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (sysstat bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2022:8948