#5727: Unclear documentation about .eventlog's spark information flag
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Reporter: shelarcy | Owner: duncan
Type: bug | Status: closed
Priority: high | Milestone: 7.4.2
Component: Documentation | Version: 7.3
Resolution: worksforme | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Changes (by duncan):
* status: new => closed
* resolution: => worksforme
Comment:
I cannot reproduce the behaviour. It works correctly for me with
ghc-7.4.1.
Using `+RTS -l-af` means we get no events (-a) except for the detailed
spark events (f) (and default ones like capset) and indeed that's what we
get with ghc-7.4.1.
e.g.
{{{
./parlist +RTS -l-af
ghc-events show parlist.eventlog | less
[..snip...]
1841000: cap 0: spark created
1842000: cap 0: spark created
1843000: cap 0: spark created
1844000: cap 0: spark created
1845000: cap 0: spark created
}}}
Using `+RTS -l-pf` means we get the default set of events, though without
sampled spark events (-p), and with detailed spark events (f) and again,
that's just what we do see with ghc-7.4.1.
{{{
./parlist +RTS -l-pf
ghc-events show parlist.eventlog | less
[..snip...]
2471000: cap 0: thread 2 is runnable
2504000: cap 0: running thread 3
2729000: cap 0: spark created
2733000: cap 0: spark created
}}}
If you're seeing something different, or you still think the behaviour or
documentation are confusing then please reopen the ticket. Thanks.
This is only a guess, but perhaps you've got an old version of ghc-events
that does not show the detailed spark events. Does the `ghc-events show`
produce this header:
{{{
34: Spark counters (size 56)
35: Spark create (size 0)
36: Spark dud (size 0)
37: Spark overflow (size 0)
38: Spark run (size 0)
39: Spark steal (size 2)
40: Spark fizzle (size 0)
41: Spark GC (size 0)
}}}
Where my log says `cap 0: spark created`, perhaps yours says something
like `cap 0: event 35`.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5727#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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