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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #4512
Closed
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Issue created Nov 18, 2010 by adept@trac-adept

EventLog does not play well with forkProcess

I am trying to see an eventlog of process that daemonizes itself via forkProcess.

Unfortunately, as parent process dies, he writes out his eventlog (or at least a header part, I haven't checked exactly), and eventlog of the child process is then appended to the same file.

As a result, neither ghc-events nor threadscope is able to read the eventlog file.

I've modified the program so that it would not fork, and generated "good" eventlog. I'm attaching it and "bad" eventlog as well so you can see the difference by yourself.

Perhaps "+RTS -ls" could write output to filename that includes the PID of the process, like "program.$PID.eventlog"?

Trac metadata
Trac field Value
Version 7.0.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Runtime System
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