[commit: ghc] wip/ppc-reg-alloc: Fix intermittent hie002 failure (2e8f664)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : wip/ppc-reg-alloc
Link       : http://ghc.haskell.org/trac/ghc/changeset/2e8f664957dc3763dc4375894b8dc4d046d2e95b/ghc

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commit 2e8f664957dc3763dc4375894b8dc4d046d2e95b
Author: Vladislav Zavialov <vlad.z.4096 at gmail.com>
Date:   Tue Feb 26 16:54:07 2019 +0300

    Fix intermittent hie002 failure
    
    hie002 is a performance test that used to fail unpredictably:
    
    	max_bytes_used Decrease from x86_64-linux-deb9-debug baseline @ HEAD~2:
    	    Expected    hie002 (normal) max_bytes_used: 1190923992.0 +/-20%
    	    Lower bound hie002 (normal) max_bytes_used:    952739193
    	    Upper bound hie002 (normal) max_bytes_used:   1429108791
    	    Actual      hie002 (normal) max_bytes_used:    726270784
    	    Deviation   hie002 (normal) max_bytes_used:        -39.0 %
    	peak_megabytes_allocated Decrease from x86_64-linux-deb9-debug baseline @ HEAD~2:
    	    Expected    hie002 (normal) peak_megabytes_allocated: 2538.0 +/-20%
    	    Lower bound hie002 (normal) peak_megabytes_allocated:   2030
    	    Upper bound hie002 (normal) peak_megabytes_allocated:   3046
    	    Actual      hie002 (normal) peak_megabytes_allocated:   1587
    	    Deviation   hie002 (normal) peak_megabytes_allocated:  -37.5 %
    	*** unexpected stat test failure for hie002(normal)
    
    'max_bytes_used' and 'peak_megabytes_allocated' are too unstable without careful
    control of the runtime configuration. We fix this by using a more predictable
    metric, 'bytes allocated'.


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2e8f664957dc3763dc4375894b8dc4d046d2e95b
 testsuite/tests/hiefile/should_compile/all.T | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/testsuite/tests/hiefile/should_compile/all.T b/testsuite/tests/hiefile/should_compile/all.T
index 9770bae..fb8092d 100644
--- a/testsuite/tests/hiefile/should_compile/all.T
+++ b/testsuite/tests/hiefile/should_compile/all.T
@@ -1,5 +1,6 @@
 test('hie001',       normal,                   compile, ['-fno-code -fwrite-ide-info -fvalidate-ide-info'])
-test('hie002',       collect_compiler_stats(), compile, ['-fno-code -fwrite-ide-info'])
+test('hie002',       collect_compiler_stats('bytes allocated',10),
+                                               compile, ['-fno-code -fwrite-ide-info'])
 test('hie003',       normal,                   compile, ['-fno-code -fwrite-ide-info -fvalidate-ide-info'])
 test('hie004',       normal,                   compile, ['-fno-code -fwrite-ide-info -fvalidate-ide-info'])
 test('hie005',       normal,                   compile, ['-fno-code -fwrite-ide-info -fvalidate-ide-info'])