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Re: [tor-bugs] #28481 [Core Tor/Tor]: Tor's startup time is getting slower on Android
#28481: Tor's startup time is getting slower on Android
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Reporter: akwizgran | Owner: (none)
Type: defect | Status: new
Priority: Medium | Milestone: Tor:
| 0.4.0.x-final
Component: Core Tor/Tor | Version: Tor:
| 0.3.4.9
Severity: Normal | Resolution:
Keywords: android startup performance | Actual Points:
controller |
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by nickm):
Hm, interesting. That result suggests that the problem is indeed CPU-
based, if it scales that cleanly with with a faster CPU. TBH that wasn't
what I had expected; I had expected something far more complicated.
In this case, a CPU profile would probably be useful.
I've done a quick-and-dirty startup profile to try to track this down,
using a hack branch called "exit_immediate" in my public repository. It
seems that the biggest offender in 0.3.5 is stuff under
"router_reload_consensus_networkstatus". It looks like we're spending our
time re-parsing and re-validating stuff from storage.
Can you confirm that your results are significantly slow if Tor starts
with cached-* files?
We already made some improvements here in 0.4.0, with #27225. I think we
can do better, though.
I've made some callgraphs with perf, and I'm attaching them here. To make
them I used my "exit_immediate" branch with:
{{{
perf record -g --call-graph dwarf ./src/app/tor -ExitImmediatly 1
perf report -g --stdio > filename.callgraph
}}}
If my hunch is right, then we want to be looking for savings opportunities
in the "with-cache" case for 0.4.0.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28481#comment:4>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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