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[Bug translator/24363] Slow pass 2 due to varuse_collecting_visitor::visit_embeddedcode()
- From: "agentzh at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Tue, 19 Mar 2019 22:27:19 +0000
- Subject: [Bug translator/24363] Slow pass 2 due to varuse_collecting_visitor::visit_embeddedcode()
- Auto-submitted: auto-generated
- References: <bug-24363-6586@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=24363
--- Comment #1 from agentzh <agentzh at gmail dot com> ---
Got some flame graphs for the generated .stp sample script attached to my
previous comment:
Classic CPU flame graph:
http://openresty.org/misc/flamegraph/stap-unordered-map-generated-script-2019-03-19.svg
Reversed CPU flame graph:
http://openresty.org/misc/flamegraph/inv-stap-unordered-map-generated-script-2019-03-19.svg
The stap has got the patch here: https://pastebin.com/vCbxcwdf And you can see
all those hash table overhead introduced by `std::unordered_map::find()`.
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