Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1412149

Summary:	time does not show really consumed time
Product:	Red Hat Enterprise Linux 7	Reporter:	Petr Pisar <ppisar>
Component:	time	Assignee:	Petr Pisar <ppisar>
Status:	CLOSED WONTFIX	QA Contact:	BaseOS QE - Apps <qe-baseos-apps>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.3	CC:	bnater, jscotka, psabata, qe-baseos-apps
Target Milestone:	rc	Keywords:	FastFix, Patch
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
URL:	http://lists.gnu.org/archive/html/bug-gnu-utils/2013-09/msg00003.html
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:	undefined	Story Points:	---
Clone Of:	1004416	Environment:
Last Closed:	2018-03-02 14:54:36 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Petr Pisar 2017-01-11 12:00:48 UTC

+++ This bug was initially created as a clone of Bug #1004416 +++

Description of problem:
Hi, then problem is based on
https://bugzilla.redhat.com/show_bug.cgi?id=960570
I've tried to use time to measure problem, but time itself is not able to deal with time shift and show incorrent result



How reproducible:
100%

Steps to Reproduce:
# CONST=70
# W=3
# time sleep $CONST& 
# BPID=$!
# sleep $W
# DOLD=`date`
# date -s "now - 1 minute"
# wait $BPID
# date -s "now + 1 minute"
# DNEW=`date`
# let DIFF=(`date +%s -d "$DNEW"` - `date +%s -d "$DOLD"`)
# echo $(($DIFF+$W)) == $CONST

Actual results:
time difference is 70 sec 
but time show:
real	0m10.001s
user	0m0.000s
sys	0m0.001s


Expected results:
real	1m10.001s

   Thanks&Regards
   Honza


--- Additional comment from Petr Pisar on 2013-09-09 12:24:20 GMT ---

Despite you use built-in `time', there is the same problem with GNU time.

I also think that time should measure monotonic (-alike) time not to get influenced by shifts in system clock.

clock_gettime(2) offers:

CLOCK_MONOTONIC -- suffers from NTP time adjustment.
CLOCK_MONOTONIC_RAW -- uses real hardware clock, I worry about precision and access permission for non-root users.
CLOCK_BOOTTIME -- includes time elapsed in suspension but suffers from NTP time adjustment. Is it worth?

I guess the CLOCK_MONOTONIC_RAW is the most appropriate.

--- Additional comment from Petr Pisar on 2014-10-21 13:15:50 GMT ---

Upstream agreed to use clock_gettime(CLOCK_MONOTONIC) for measuring the "real" value.

[...]

Patches posted to upstream <http://lists.gnu.org/archive/html/bug-gnu-utils/2016-12/msg00000.html>, but upstream seems dead.

Comment 1 Petr Pisar 2018-03-02 14:54:36 UTC

We do not plan to fix this issue in RHEL-7. If you are affected, please escalate it to Red Hat support with reference to this bug report.