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https://issues.apache.org/jira/browse/LUCENE-10099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17415268#comment-17415268
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Mark Robert Miller commented on LUCENE-10099:
---------------------------------------------
{quote}Will it help this profiler?
{quote}
I think the reason the output above is not listing proper java methods may be
how I am plugging in a custom agent (trying to keep the ability to allow
filtering by java thread properties). I may need to just use the agent built
into the .so library.
> Add -Ptests.asyncprofile option.
> --------------------------------
>
> Key: LUCENE-10099
> URL: https://issues.apache.org/jira/browse/LUCENE-10099
> Project: Lucene - Core
> Issue Type: Test
> Components: modules/test-framework
> Reporter: Mark Robert Miller
> Assignee: Mark Robert Miller
> Priority: Minor
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Man, I don't even remember the last time I contributed an issue to Lucene
> that was for Lucene. Feels like it has to be near a decade.
> I recently finished some work that took quite an investment around automated
> performance aids. It wasn't giving me that feeling of satisfaction I faintly
> remember though. Yesterday, I was mostly feeling nostalgic about past times
> when I would bring up some nasty inefficiency or ugly problem and not hear
> about how it doesn't likely matter or doesn't sound right or 'meh' - I'd hear
> "omg, you're right, this must be fixed" and then "you're an idiot, it's even
> worse than that".
> So new little project for today - the first of two things I'd like to
> contribute - async profiler support for the tests.profile option.
> I have a rough draft, it works roughly as tests.profile but instead of:
> {noformat}
> PROFILE SUMMARY from 174 events (total: 174)
> tests.profile.mode=cpu
> tests.profile.count=10
> tests.profile.stacksize=1
> tests.profile.linenumbers=false
> PERCENT CPU SAMPLES STACK
> 5.17% 9 java.util.zip.Inflater#inflateBytesBytes()
> 3.45% 6 java.io.FileInputStream#open0()
> 2.30% 4 java.io.UnixFileSystem#getBooleanAttributes0()
> 2.30% 4 java.io.RandomAccessFile#readBytes()
> 1.72% 3 java.io.UnixFileSystem#normalize()
> 1.72% 3
> org.apache.lucene.util.automaton.RunAutomaton#<init>()
> 1.72% 3 java.util.Arrays#fill()
> 1.15% 2
> java.lang.invoke.DirectMethodHandle$Holder#invokeStatic()
> 1.15% 2 java.lang.StringLatin1#charAt()
> 1.15% 2 java.io.DataOutputStream#writeUTF()
> {noformat}
> you get more like:
> {noformat}
> PROFILE SUMMARY from 368675 events (total: 368675)
> tests.profile.mode=cpu
> tests.profile.count=10
> tests.profile.stacksize=1
> tests.profile.linenumbers=false
> PERCENT CPU SAMPLES STACK
> 3.89% 14353 #SymbolTable::lookup_dynamic()
> 1.67% 6171 #Interpreter()
> 1.40% 5175 #InstanceKlass::find_method_index()
> 1.34% 4958 #__tls_get_addr()
> 1.13% 4177 #I2C/C2I adapters()
> 1.09% 4022 #resource_allocate_bytes()
> 0.69% 2528 #ValueStack::values_do()
> 0.62% 2298 #no_Java_frame()
> 0.62% 2281 #ScopeDesc::decode_body()
> 0.55% 2017 #Dictionary::find()
> {noformat}
> as well as these additional files shown below. Sampling was a bit intense I
> guess, sorry for the slow load on the flame graph ;)
> Summary
> https://elated-banach-e02e8b.netlify.app/asyncprofiler/hotspot-pid-686723-id-0-20210912-162040.txt
> Results Tree
> https://elated-banach-e02e8b.netlify.app/asyncprofiler/tree-hotspot-pid-686723-id-0-20210912-162044.html
> Results Flame Graph
> https://elated-banach-e02e8b.netlify.app/asyncprofiler/flame-hotspot-pid-686723-id-0-20210912-162040.html
>
>
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