[GHC] #10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011
#10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011 -------------------------------------+------------------------------------- Reporter: thomie | Owner: Type: task | Status: new Priority: high | Milestone: Component: Profiling | Version: 7.10.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Commit c81e07063dd4f792d65f5933cfb906620d120b24 (#8811) makes a small change to the formatting of the profiling output. When updating the prof.sample files in the `testsuite/tests/profiling/should_run` directory, we noticed that memory allocation numbers for several tests have increased substantially since 2011. {{{ -total alloc = 107,829,264 bytes (excludes profiling overheads) +total alloc = 538,951,032 bytes (excludes profiling overheads) }}} The following tests need investigation: * T680.prof.sample (2x total alloc) * prof-doc-fib.prof.sample (5x) * prof-doc-last.prof.sample (3x) * scc003.prof.sample (2x) Maybe it's nothing serious, but I'm setting priority to high since it seems like a regression. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10247 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011 -------------------------------------+------------------------------------- Reporter: thomie | Owner: Type: task | Status: new Priority: high | Milestone: Component: Profiling | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by rwbarton): I tried running the tests with 7.8.4 since I don't have HEAD built with profiling libraries at the moment. I see almost exactly 2x factors on T680, prof-doc-last, and scc003. I also notice that these prof files are all from Oct 25-27 2011. Probably they were just generated on a 32-bit processor? For prof-doc-fib I notice that the profiling output changed in a recent (not in 7.8.4) commit daed18c35cda114d8a5303bcb645195e1fd397e3, and the old file agrees with the above. That is, it showed almost exactly half the total allocation that I see, and it is from the same date range. So there seems to be no alarm through 7.8.4. I'll try HEAD to see if there is any change. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10247#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011 -------------------------------------+------------------------------------- Reporter: thomie | Owner: Type: task | Status: new Priority: high | Milestone: Component: Profiling | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by rwbarton): Now testing with HEAD, on a hunch I tried `make fast TEST=prof-doc-fib` (which only runs the profasm test way), and I got a number which (exactly!) matched the previous prof-doc-fib.prof.sample value. So I think that file was produced with profasm. (Would be nice to record this information...) prof-doc-last really did regress from 7.8.4 to 7.10.1, though: {{{ total alloc = 408,053,512 bytes (excludes profiling overheads) -- 7.8.4 total alloc = 648,053,536 bytes (excludes profiling overheads) -- 7.10.1 }}} presumably due to b709f0a047dc036de15dc43d3b0ab88d3e32c5e6. But the extra allocations go away when optimizations are enabled, so I guess it's okay. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10247#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011 -------------------------------------+------------------------------------- Reporter: thomie | Owner: Type: task | Status: closed Priority: high | Milestone: Component: Profiling | Version: 7.10.1 Resolution: worksforme | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by rwbarton): * status: new => closed * resolution: => worksforme Comment: I filed the `last` issue as #10260 so I'm going to close this--would really be nice to record more information about those prof.sample files though. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10247#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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