[Xapian-tickets] [Xapian] #767: Make testcases using different backends run in parallel

[Xapian]

#767: Make testcases using different backends run in parallel
------------------------------+-------------------------------------
 Reporter:  Guruprasad Hegde  |             Owner:  Guruprasad Hegde
     Type:  enhancement       |            Status:  new
 Priority:  normal            |         Milestone:
Component:  Test Suite        |           Version:  git master
 Severity:  normal            |        Resolution:
 Keywords:                    |        Blocked By:
 Blocking:                    |  Operating System:  All
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Comment (by Olly Betts):

 Here are the timings - saving was actually jut under 11% for 4-way
 parallelism.  This was on x86 with eatmydata and without valgrind (just so
 the runs didn't take so long).  `/proc/cpuinfo` reports 8 CPUs, but I
 think it's really 4 + hyperthreading.

 {{{
 time make check -sj4 VALGRIND= AUTOMATED_TESTING=1

 real    2m26.917s
 user    1m8.072s
 sys     0m36.666s

 time make check -sj2 VALGRIND= AUTOMATED_TESTING=1

 real    2m29.914s
 user    1m8.009s
 sys     0m36.334s

 time make check -s VALGRIND= AUTOMATED_TESTING=1

 real    2m44.534s
 user    1m8.860s
 sys     0m37.316s
 }}}

 Also notable is that there's not much speed up from 2 to 4 processes.

 User and system time is reassuringly similar across the runs too.
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Ticket URL: <https://trac.xapian.org/ticket/767#comment:10>
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