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authorSitsofe Wheeler <sitsofe@yahoo.com>2017-04-23 22:54:54 +0100
committerSitsofe Wheeler <sitsofe@yahoo.com>2017-08-14 04:43:15 +0100
commit997b5680d139ce82c2034ba3a0d602cfd778b89b (patch)
treeb3b10299ef067433c7bd3c7bdc41d9d17be2de33 /doc
parenta94a977497636bdcbef7106ce3617c96c8ad66bd (diff)
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fio: add serialize_overlap option
If this isn't set (the default) fio can submit write I/Os that overlap other in-flight I/Os leading to potential data races. For example the following job frequently fails at the verification stage: ./fio --random_distribution=zipf:1.6 --direct=1 --filename \ /tmp/fiofile --ioengine=posixaio --iodepth=32 --size=20M --bs=4k \ --rw=randwrite --verify=crc32c --name=verifyoverlap When serialize_overlap=1 fio avoids creating such races. Thanks to Rachel Lunnon (StorMagic) for helping me debug the initial version of this! Fixes: https://github.com/axboe/fio/issues/335 v2: Fix merge conflict and add missing conversion. v3: Add man page, fix serialize_overlap disabling, improve commit message. Tested-by: Jeff Furlong <jeff.furlong@wdc.com> Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com>
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