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bitbake: toaster: targets page performance improvement

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Yet another performance improvement, this time by forcing
two-step evaluation instead of using subqueries to select data.

This avoid using full-table lookups on un-indexed temporary
tables.

(Bitbake rev: 03e3286dcdc557a314c139b55b458d6fefcbc51c)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Alexandru DAMIAN
2015-03-12 14:44:56 +00:00
committed by Richard Purdie
parent a273d8f151
commit 5b22f15557
1 changed files with 4 additions and 1 deletions
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bitbake/lib/toaster/toastergui/views.py
+4 -1
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@@ -2767,7 +2767,10 @@ if toastermain.settings.MANAGED:
queryset_with_search = _get_queryset(Recipe, queryset_all, None, search_term, ordering_string, '-name')
# get unique values for 'name', and select the maximum ID for each entry (the max id is the newest one)
queryset_with_search_maxids = queryset_with_search.values('name').distinct().annotate(max_id=Max('id')).values_list('max_id')
# force evaluation of the query here; to process the MAX/GROUP BY, a temporary table is used, on which indexing is very slow
# by forcing the evaluation here we also prime the caches
queryset_with_search_maxids = map(lambda i: i[0], list(queryset_with_search.values('name').distinct().annotate(max_id=Max('id')).values_list('max_id')))
queryset_with_search = queryset_with_search.filter(id__in=queryset_with_search_maxids).select_related('layer_version', 'layer_version__layer', 'layer_version__up_branch', 'layer_source')