https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=30169
Bug ID: 30169
Summary: Prefetching is expensive for performance
Change sponsored?: ---
Product: Koha
Version: master
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: P5 - low
Component: Architecture, internals, and plumbing
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
When working on bug 30168 I checked out 500 items to a patron to test
performance
I found that after adding the prefetch, things were worse.
Testing on command line seems to suggest prefetch is worse than repeated
fetches
time perl -e 'use Koha::Checkouts; for( my $i=0;$i<500;$i++){
Koha::Checkouts->find({itemnumber=>541}) } print "2\n";'
2
real 0m1.850s
user 0m1.701s
sys 0m0.096s
root@kohadevbox:koha(master)$ time perl -e 'use Koha::Checkouts; for( my
$i=0;$i<500;$i++){ Koha::Checkouts->find({itemnumber=>541},{prefetch =>
['itemnumber','borrowernumber']}) } print "2\n";'
2
real 0m10.770s
user 0m10.452s
sys 0m0.104s
root@kohadevbox:koha(master)$ time perl -e 'use Koha::Checkouts; for( my
$i=0;$i<500;$i++){ my $co =Koha::Checkouts->find({itemnumber=>541},{prefetch =>
['itemnumber','borrowernumber']}); my $item = $co->item; my $pat = $co->patron
} print "2\n";'
2
real 0m13.153s
user 0m12.600s
sys 0m0.140s
root@kohadevbox:koha(master)$ time perl -e 'use Koha::Checkouts; for( my
$i=0;$i<500;$i++){ my $co =Koha::Checkouts->find({itemnumber=>541}); my $item =
$co->item; my $pat = $co->patron } print "2\n";'
2
real 0m3.873s
user 0m3.493s
sys 0m0.139s
--
You are receiving this mail because:
You are watching all bug changes.
You are the assignee for the bug.
_______________________________________________
Koha-bugs mailing list
[email protected]
https://lists.koha-community.org/cgi-bin/mailman/listinfo/koha-bugs
website : http://www.koha-community.org/
git : http://git.koha-community.org/
bugs : http://bugs.koha-community.org/
