#6110: Data.Vector.Unboxed performance regression of 7.4.1 relative to 7.0.4
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Reporter: mdgabriel | Owner: pcapriotti
Type: bug | Status: infoneeded
Priority: high | Milestone: 7.4.3
Component: Compiler | Version: 7.4.1
Keywords: Vector Performance Regression | Os: Linux
Architecture: x86 | Failure: Runtime
performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: #6111 |
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Changes (by pcapriotti):
* status: new => infoneeded
Comment:
I can't reproduce this regression. I tried every compiler since 7.0.3, and
they
all give very similar results in this benchmark.
Here are my results with 7.4.1:
{{{
100000000 0m0.328s
200000000 0m0.644s
300000000 0m0.948s
400000000 0m1.256s
500000000 0m1.572s
600000000 0m1.872s
700000000 0m2.208s
800000000 0m2.488s
900000000 0m2.784s
1000000000 0m3.132s
}}}
and 7.0.4:
{{{
100000000 0m0.324s
200000000 0m0.624s
300000000 0m0.936s
400000000 0m1.252s
500000000 0m1.544s
600000000 0m1.856s
700000000 0m2.148s
800000000 0m2.472s
900000000 0m2.784s
1000000000 0m3.092s
}}}
As you can see, 7.0.4 is only slightly faster. I don't think the
difference is
significant, and it certainly is not a factor of 2.4.
@mdgabriel: can you provide any other information that could help us
reproduce
the problem?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6110#comment:5>
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