https://sourceware.org/bugzilla/show_bug.cgi?id=27701
Bug ID: 27701
Summary: use long lived debuginfod-client objects & curl
handles
Product: elfutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: debuginfod
Assignee: unassigned at sourceware dot org
Reporter: fche at redhat dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Discussion of bug #27673 brought light to an important source of inefficiency
in the debuginfod protocol for applications that make repeated queries. The
basic problem is that each time we nuke and recreate a curl handle, any cached
information such as an active keep-alive http connection, or crypto session
keys, are thrown away. Each new connection can take time & CPU, bleeding
latency.
If we retain the curl-easy handles across debuginfod-client calls, rather than
creating/destroying them during Every Call, then much of that setup work is
eliminated, and anti-DoS web firewall concerns also eased. Some estimates here
indicate savings of hundreds of milliseconds per call are available, and even
more if DoS penalties are applied.
debuginfod would itself be a good client to use this tactic to maintain
persistent connections to its federation partners.
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