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Enable IO concurrency on all systems
Previously effective_io_concurrency and maintenance_io_concurrency could not be set above 0 on machines without fadvise support. AIO enables IO concurrency without such support, via io_method=worker. Currently only subsystems using the read stream API will take advantage of this. Other users of maintenance_io_concurrency (like recovery prefetching) which leverage OS advice directly will not benefit from this change. In those cases, maintenance_io_concurrency will have no effect on I/O behavior. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/CAAKRu_atGgZePo=_g6T3cNtfMf0QxpvoUh5OUqa_cnPdhLd=gw@mail.gmail.com
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@@ -361,11 +361,7 @@ static relopt_int intRelOpts[] =
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RELOPT_KIND_TABLESPACE,
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ShareUpdateExclusiveLock
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},
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#ifdef USE_PREFETCH
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-1, 0, MAX_IO_CONCURRENCY
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#else
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0, 0, 0
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#endif
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},
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{
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{
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@@ -374,11 +370,7 @@ static relopt_int intRelOpts[] =
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RELOPT_KIND_TABLESPACE,
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ShareUpdateExclusiveLock
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},
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#ifdef USE_PREFETCH
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-1, 0, MAX_IO_CONCURRENCY
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#else
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0, 0, 0
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#endif
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},
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{
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{
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