[Xapian-tickets] [Xapian] #764: qp_scale1 intermittently fails on 64-core POWER9 workstation

[Xapian]

#764: qp_scale1 intermittently fails on 64-core POWER9 workstation
------------------------+-------------------------------
 Reporter:  A. Wilcox   |             Owner:  Olly Betts
     Type:  defect      |            Status:  new
 Priority:  normal      |         Milestone:
Component:  Test Suite  |           Version:  1.4.6
 Severity:  normal      |        Resolution:
 Keywords:              |        Blocked By:
 Blocking:              |  Operating System:  Linux
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Comment (by Olly Betts):

 I've made some changes which may improve this, though for me it only fails
 very very rarely so I can't be very sure.  These should be in 1.4.15 (once
 it is release):

 * 626bb0058fdcee9a30e667ebde1ae4ca66e8ff39 (cherry picked from commit
 c30ec9a6ca9f1a91e0d7c160cabf280c3b1c5299)
 * 399d143dd6a32913c81f782e968ba0640474232d (cherry picked from commit
 f8383842183b6af604f7f066a9538754d9b263af)
 * 15a48e06de22a8a23a6a2bf26d84e1329fcd595d (cherry picked from commit
 d94be50772672c7bfbe120a0af7d10feb331ea42)
 * 1e80e20039cd2841a2d40079e06aba21d8aa99a7 (cherry picked from commit
 a171ad53225e7aaa079b0aef80790f2a24e08c44)

 Feedback on whether these changes help would be useful.

 If this testcase remains a bit flaky perhaps we should change it to test
 the scaling behaviour for the current "large" case as the number of
 repeated copies of the input query string grows (which is more like how
 our other scaling testcases work) - currently it compares parsing one copy
 N*M times with parsing N copies M times.
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Ticket URL: <https://trac.xapian.org/ticket/764#comment:3>
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