Opened 3 years ago

Closed 3 years ago

#7211 closed bug (invalid)

Huge space leak on a program that shouldn't leak

Reported by: bartavelle Owned by:
Priority: normal Milestone:
Component: Compiler Version: 7.4.2
Keywords: Cc:
Operating System: Linux Architecture: x86_64 (amd64)
Type of failure: Runtime performance bug Test Case:
Blocked By: Blocking:
Related Tickets: Differential Revisions:

Description

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.

Attachments (5)

package.bad (1.6 KB) - added by bartavelle 3 years ago.
List of packages for the "bad" program.
package.good (1.9 KB) - added by bartavelle 3 years ago.
List of packages for the "good" program.
genstats-simplepatterns.hs (5.5 KB) - added by bartavelle 3 years ago.
Faulty program.
patternstats-simple.hr.hp (47.0 KB) - added by bartavelle 3 years ago.
output of -hr
patternstats-simple.hp (28.2 KB) - added by bartavelle 3 years ago.
output of -hy

Download all attachments as: .zip

Change History (6)

Changed 3 years ago by bartavelle

List of packages for the "bad" program.

Changed 3 years ago by bartavelle

List of packages for the "good" program.

Changed 3 years ago by bartavelle

Faulty program.

Changed 3 years ago by bartavelle

output of -hr

Changed 3 years ago by bartavelle

output of -hy

comment:1 Changed 3 years ago by bartavelle

  • Resolution set to invalid
  • Status changed from new to closed

I erased and rebuilt all my packages again, everything works right. Sorry for the noise.

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