12-31-2018
Quote:
Originally Posted by
newbie_01
I don't want to change the block size. I just want to be able to run several dbv's instead of one at a time.
I think we (that includes jgt) have understood that. The problem is: verifing the DB creates a certain amount of usage on your disk subsystem because it causes (quite some amount of) disk I/O. if you run several instances of it in parallel it depends on the amount of disk I/O a single instance creates if these several instances run faster linearly with the number of instances.
i.e. if a single instance of the script taxes the disk 10% then running 5 simultaneous instances will drive that up to 50% and run perhaps somewhere in the ballpark of 1/5 of the time. If a single instance taxes the disk already 100% then running 5 instances in parallel will perhaps run about as fast a single instance because you can't tax any resource more than 100%. The disk I/O will be queued (thus serialised again) and this will put a cap at runtime. Perhaps reality is somewhere in between those extremes but you may want to find out beforehand where you stand.
I hope this helps.
bakunin
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT CENTOS
pmdelprofile
PMDELPROFILE(3) Library Functions Manual PMDELPROFILE(3)
NAME
pmDelProfile - delete instance(s) from the current PMAPI instance profile
C SYNOPSIS
#include <pcp/pmapi.h>
int pmDelProfile(pmInDom indom, int numinst, int *instlist);
cc ... -lpcp
DESCRIPTION
The set of instances for performance metrics returned from a pmFetch(3) call may be filtered or restricted using an instance profile.
There is one instance profile for each context the application creates at the Performance Metrics Application Programming Interface
(PMAPI), and each instance profile may include instances from one or more instance domains (see pmLookupDesc(3)).
pmDelProfile may be used to delete instance specifications from the instance profile of the current PMAPI context.
In the simplest variant, the list of instances identified by the instlist argument for the indom instance domain are removed from the
instance profile. The list of instance identifiers contains numinst values.
The indom value would normally be extracted from a call to pmLookupDesc(3) for a particular performance metric, and the instances in
instlist would typically be determined by calls to pmGetInDom(3) or pmLookupInDom(3).
If indom equals PM_INDOM_NULL or numinst is zero, then all instance domains are selected for deletion. If instlist is NULL, then all
instances in the selected domain(s) are removed from the profile.
To disable all available instances in all domains, use pmDelProfile(PM_INDOM_NULL, 0, NULL). This is the only situation in which indom may
be PM_INDOM_NULL.
SEE ALSO
pmAddProfile(3), PMAPI(3), pmFetch(3), pmGetInDom(3), pmLookupDesc(3), pmLookupInDom(3), pmNewContext(3), pmUseContext(3) and pmWhichCon-
text(3).
DIAGNOSTICS
PM_ERR_PROFILESPEC
indom was PM_INDOM_NULL and instlist was not empty
CAVEAT
It is possible to delete non-existent instance domains and non-existent instances from an instance profile. None of the routines that use
the instance profile will ever issue an error if you do this. The cost of checking, when checking is possible, outweighs any benefits.
Performance Co-Pilot PCP PMDELPROFILE(3)