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Bug 1763579 - 'pidstat -I' do not report %usr correctly with multithread program [rhel-7.9.z]
Summary: 'pidstat -I' do not report %usr correctly with multithread program [rhel-7.9.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: sysstat
Version: 7.7
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Lukáš Zaoral
QA Contact: Radka Brychtova
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-10-21 04:37 UTC by Kirby Zhou
Modified: 2022-12-13 11:19 UTC (History)
10 users (show)

Fixed In Version: sysstat-10.1.5-20.el7_9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-12-13 11:19:18 UTC
Target Upstream Version:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2022:8948 0 None None None 2022-12-13 11:19:19 UTC

Description Kirby Zhou 2019-10-21 04:37:50 UTC 
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 4 RHEL 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.
Comment 6 Michal Sekletar 2022-08-31 12:42:41 UTC 
Let's reopen the BZ as there is significant interest from the customer the get this BZ fixed.
Comment 20 errata-xmlrpc 2022-12-13 11:19:18 UTC 
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
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