#7211: Huge space leak on a program that shouldn't leak
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Reporter: bartavelle | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.2 | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: Runtime performance bug | Testcase:
Blockedby: | Blocking:
Related: |
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I have a program that works in a small amount of memory on a computer
(less than 50mb) and leaks until it takes all available memory on another
(with 16GB RAM).
I am unsure if this is a compiler bug, or a bug in one of the packages I
use. I am also unsure on how to diagnose it.
You will find attached the ghc-pkg list for both computers, the offending
program, and the output of -hp and -hy for the offending case. To
reproduce the test it should be used like that :
genstats-simplepatterns dictionary output
Where dictionary is a large text file with a word per line (such as the
rockyou list). The program itself is a fold that compiles statistics for
each input line.
The "good" program is built with GHC-7.4.1. The bad one used to be built
with it. As I suspected a package problem, I cleaned all my installation
and started with a fresh GHC-7.4.2 + latest Haskell platform, but the
result was identical.
The space leak seems to occur in HashMap, but converting all instances
into Data.Map results in another leak.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7211>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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