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[GHC] #6104: Regression: space leak in HEAD vs. 7.4

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[GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:                              
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
 I often keep an eye on compiler performance by compiling Cabal.  Yesterday
 I noticed that HEAD appears to have a space leak: it needs 806MB to
 compile Cabal with -O, vs 424MB with 7.4.1.

 Here are the results.  First 7.4.1:

 {{{
 $ ghc-7.4.1 -O --make Distribution.Simple +RTS -s
 }}}

 {{{
   53,658,077,704 bytes allocated in the heap
    9,679,170,192 bytes copied during GC
      148,845,896 bytes maximum residency (56 sample(s))
        6,610,216 bytes maximum slop
              424 MB total memory in use (0 MB lost due to fragmentation)

                                     Tot time (elapsed)  Avg pause  Max
 pause
   Gen  0     102382 colls,     0 par   24.24s   24.22s     0.0002s
 0.0046s
   Gen  1        56 colls,     0 par   12.48s   12.48s     0.2229s
 0.4738s

   INIT    time    0.00s  (  0.00s elapsed)
   MUT     time   57.37s  ( 60.81s elapsed)
   GC      time   36.72s  ( 36.70s elapsed)
   EXIT    time    0.00s  (  0.00s elapsed)
   Total   time   94.09s  ( 97.52s elapsed)
 }}}

 And HEAD:

 {{{
 $ ghc-nightly2 -O --make Distribution.Simple +RTS -s
 }}}

 {{{
   55,699,304,032 bytes allocated in the heap
   11,721,558,728 bytes copied during GC
      288,988,200 bytes maximum residency (50 sample(s))
        7,808,192 bytes maximum slop
              806 MB total memory in use (0 MB lost due to fragmentation)

                                     Tot time (elapsed)  Avg pause  Max
 pause
   Gen  0     107655 colls,     0 par   28.83s   28.83s     0.0003s
 0.0043s
   Gen  1        50 colls,     0 par   16.36s   16.36s     0.3272s
 1.0063s

   TASKS: 3 (1 bound, 2 peak workers (2 total), using -N1)

   INIT    time    0.00s  (  0.00s elapsed)
   MUT     time   59.87s  ( 63.18s elapsed)
   GC      time   45.19s  ( 45.19s elapsed)
   EXIT    time    0.00s  (  0.00s elapsed)
   Total   time  105.07s  (108.37s elapsed)
 }}}

 We need to squash this before 7.6 is released.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  pcapriotti                  
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by pcapriotti):

  * owner:  => pcapriotti


--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:1>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:                              
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by pcapriotti):

  * owner:  pcapriotti =>


Comment:

 Here are some heap profiler reports comparing GHC HEAD with 7.4 when
 compiling
 Cabal and the single Cabal module Distribution/Simple/Setup.hs.

 They are obtained by running:

 {{{
 ghc -O --make Distribution.Simple +RTS -hc
 }}}

 and

 {{{
 ghc -O -fforce-recomp --make Distribution/Simple/Setup.hs +RTS -hc
 }}}

 respectively, with both compilers built with `-prof -auto` on
 `compiler/simplCore/Simplify.lhs`, where the leak seems to be located.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:2>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:                              
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by simonmar):

 I've narrowed this down to something that happened around May 8-10.  I'm
 seeing a roughly 10% increase in compile times that was in the May 10
 nightly build compared to the May 8 nightly build (I've unpacked the
 builds to check).

 e.g. compiling Cabal with -O and ghc-20120508:

 {{{
   51,777,170,264 bytes allocated in the heap
   10,213,181,272 bytes copied during GC
      174,111,968 bytes maximum residency (57 sample(s))
        6,843,024 bytes maximum slop
              496 MB total memory in use (0 MB lost due to fragmentation)

                                     Tot time (elapsed)  Avg pause  Max
 pause
   Gen  0     100232 colls,     0 par   25.37s   25.36s     0.0003s
 0.0040s
   Gen  1        57 colls,     0 par   13.46s   13.46s     0.2362s
 0.5846s

   INIT    time    0.00s  (  0.00s elapsed)
   MUT     time   58.57s  ( 61.82s elapsed)
   GC      time   38.82s  ( 38.82s elapsed)
   EXIT    time    0.00s  (  0.00s elapsed)
   Total   time   97.40s  (100.65s elapsed)
 }}}

 and with ghc-20120510:

 {{{
   55,714,073,216 bytes allocated in the heap
   11,751,752,512 bytes copied during GC
      288,316,064 bytes maximum residency (51 sample(s))
        8,407,960 bytes maximum slop
              809 MB total memory in use (0 MB lost due to fragmentation)

                                     Tot time (elapsed)  Avg pause  Max
 pause
   Gen  0     107660 colls,     0 par   28.91s   28.90s     0.0003s
 0.0044s
   Gen  1        51 colls,     0 par   16.56s   16.56s     0.3247s
 1.0106s

   INIT    time    0.00s  (  0.00s elapsed)
   MUT     time   60.13s  ( 63.20s elapsed)
   GC      time   45.47s  ( 45.46s elapsed)
   EXIT    time    0.00s  (  0.00s elapsed)
   Total   time  105.60s  (108.67s elapsed)
 }}}

 we don't have a May 9 build because the change from mtl to transformers
 broke it.

 I've had a look at the patches that went in around that time, and these
 are the only possible culprits as far as I can tell:

 {{{
 commit f7e246b50a33c329e9730296f7a342e03bc3db72
 Merge: 4b089db... ff10612...
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Wed May 9 15:50:54 2012 +0100

     Merge branch 'ghc-new-flavor'

 commit 4bbd6baee066b906ed93a0659205ecbffdbd0954
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Fri May 4 23:02:46 2012 +0100

     Simplify the SimplCont data type

 commit e08cad76e8a434aca42996f79fc8bb790f291570
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Tue May 8 10:25:22 2012 +0100

     Wibbles to 'simplify the SimplCont data type'

 commit 2112f43c466935818a371c53c706608cfa069d01
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Wed May 9 11:06:44 2012 +0100

     Be a little less aggressive about inlining (fixes Trac #5623)

 commit 980372f357667c1ba63b28acbf5798826890b7a5
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Wed May 9 16:22:49 2012 +0100

     Re-do the "function application discount" (fixes Trac #6048)
 }}}

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:3>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  igloo                      
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by igloo):

  * owner:  => igloo


--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:4>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  igloo                      
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by igloo):

 Most of the regression comes from this patch:
 {{{
 commit 980372f357667c1ba63b28acbf5798826890b7a5
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Wed May 9 16:22:49 2012 +0100

     Re-do the "function application discount" (fixes Trac #6048)
 }}}
 (the SimplCont patches also made things a bit worse, but I haven't looked
 into that at all).

 I think that the problem is more/bigger inlinings, rather than a space
 leak in GHC itself. I'll attach `CopyFile.hs`, and `before.txt` and
 `after.txt` showing the interface files before and after this patch is
 applied.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:5>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by igloo):

  * owner:  igloo => simonpj


Comment:

 Simon, would it make most sense for you to look at the heuristics?
 Otherwise, please bounce it back to Paolo or I.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:6>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by igloo):

 #4138 is another inlining-heuristic-related ticket.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:7>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by simonpj):

 There doesn't seem to be much of a difference on `CopyFile`, at least not
 now. Here's the size of the .o file:
 {{{
                 text       data     bss     dec     hex filename
 With 7.4.1      6480        760       0    7240    1c48 T6104.o
 With HEAD       4769        704       0    5473    1561 T6104.o
 }}}
 So HEAD generates less code, not more.  The compiler does allocate a bit
 more, but not much:
 {{{
 -------- 7.4.1  with -O on CopyFile.hs ------------
 [1 of 1] Compiling CopyFile         ( T6104.hs, T6104.o )
      146,131,584 bytes allocated in the heap
       67,295,032 bytes copied during GC
       16,663,568 bytes maximum residency (6 sample(s))
        1,330,480 bytes maximum slop
               33 MB total memory in use (0 MB lost due to fragmentation)


 -------- HEAD  with -O on CopyFile.hs ------------
 [1 of 1] Compiling CopyFile         ( T6104.hs, T6104.o )
      156,295,232 bytes allocated in the heap
       71,474,496 bytes copied during GC
       16,357,872 bytes maximum residency (7 sample(s))
        1,451,648 bytes maximum slop
               32 MB total memory in use (0 MB lost due to fragmentation)
 }}}
 I suppose the next thing is to try compiling Cabal.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:8>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by simonpj):

 Interface file size:
 {{{
 GHC 7.4.1 -O     -rw-rw-r-- 1 simonpj GHC  5983 Jul 16 15:21 T6104.hi
 HEAD             -rw-rw-r-- 1 simonpj GHC 10487 Jul 16 14:08 T6104.hi
 }}}
 So, yes, the interface file is a lot bigger. Looking more closely, this
 seems largely accidental.  The code in HEAD is broken into more functions,
 each of which is individually small enough to be below the inlining-
 creation threshold.

 I compiled Cabal with -O, and compared the total size (with `ls -l`) of
 the `.o` files and `.hi` files with both compilers:
 {{{
                    HEAD change over 7.4.1
 .o file size            -6%
 .hi file size           +8%
 }}}
 So yes, interface file size is up, but not massively, and .o file size is
 down.

 This does not seem to account for the originally-reported doubling of
 residency! And (I've checked) that doubling is still happening.

 Conclusion: I don't think it's just bigger interface files. I there is
 some other space leak too.

 Simon

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:9>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by simonpj):

 Paulo, might you produce a space profile of 7.4.1 and HEAD compiling
 Cabal?  Thanks

 Simon

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:10>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonpj                    
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by simonpj@…):

 commit cd627bcfda713efa63b7f5290c84a5077f4976f9
 {{{
 Author: Simon Peyton Jones <[hidden email]>
 Date:   Fri Jul 20 20:07:51 2012 +0100

     Do calcUnfoldingGuidance on the *non* occ-analysed RHS

     See Note [Calculate unfolding guidance on the non-occ-anal'd
 expression]
     This makes a big difference to residency (530M vs over 800M when
 compiling
     Cabal).

     This fixes the majority of the regression in Trac #6104

  compiler/coreSyn/CoreUnfold.lhs |   79
 +++++++++++++++++++++++++-------------
  1 files changed, 52 insertions(+), 27 deletions(-)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:11>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  igloo                      
        Type:  bug               |      Status:  new                        
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by simonpj):

  * owner:  simonpj => igloo


Comment:

 I claim we are done here.  Paolo or Ian, can you check and close?

 Compiling Cabal seems like a good perf test, if an expensive one.  Maybe
 we should add it as a perf regression test?

 Simon

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:12>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  igloo                      
        Type:  bug               |      Status:  merge                      
    Priority:  highest           |   Milestone:  7.6.1                      
   Component:  Compiler          |     Version:  7.5                        
    Keywords:                    |          Os:  Unknown/Multiple            
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
  Difficulty:  Unknown           |    Testcase:                              
   Blockedby:                    |    Blocking:                              
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by pcapriotti):

  * status:  new => merge


Comment:

 Residency is now only 25% bigger in HEAD. Closing.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:13>
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Re: [GHC] #6104: Regression: space leak in HEAD vs. 7.4

GHC
In reply to this post by GHC
#6104: Regression: space leak in HEAD vs. 7.4
-------------------------------------------+--------------------------------
  Reporter:  simonmar                      |          Owner:  igloo          
      Type:  bug                           |         Status:  closed          
  Priority:  highest                       |      Milestone:  7.6.1          
 Component:  Compiler                      |        Version:  7.5            
Resolution:  fixed                         |       Keywords:                  
        Os:  Unknown/Multiple              |   Architecture:  Unknown/Multiple
   Failure:  Compile-time performance bug  |     Difficulty:  Unknown        
  Testcase:                                |      Blockedby:                  
  Blocking:                                |        Related:                  
-------------------------------------------+--------------------------------
Changes (by pcapriotti):

  * status:  merge => closed
  * resolution:  => fixed


Comment:

 Merged as 1363c32a0d5b79c846530fa16d09076d02f29d1c.

--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:14>
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