On 11/30/2017 04:41 PM, Phillip Chen wrote:
> It appears that there is a limitation of 64 maximum zones. I tried to
> use 200 zones (100 empty and 100 with 1%) and I got the following
> error: "fio: access percentage don't add up to 100 for zoned random
> distribution (got=32)". Would it be possible to extend the number of
> zones up to 256 (since 200 is the maximum that you'd be able to use
> since the percentage is the smallest chance usable)?
> Here's the string I was using:
> fio --name=rand_reads --ioengine=libaio --direct=1 --exitall --thread
> --filename=/dev/sde --runtime=30 --readwrite=randread --iodepth=1
> --random_distribution=zoned_abs:0/1879048192:1/256m:0/44023414784:1/256m:0/2415919104:1/256m:0/4563402752:1/256m:0/2415919104:1/256m:0/116500987904:1/256m:0/18253611008:1/256m:0/107642617856:1/256m:0/82946555904:1/256m:0/34359738368:1/256m:0/53687091200:1/256m:0/98247376896:1/256m:0/74088185856:1/256m:0/28185722880:1/256m:0/28722593792:1/256m:0/2415919104:1/256m:0/27380416512:1/256m:0/116769423360:1/256m:0/27380416512:1/256m:0/24159191040:1/256m:0/3221225472:1/256m:0/33554432000:1/256m:0/63619203072:1/256m:0/13958643712:1/256m:0/37312528384:1/256m:0/8589934592:1/256m:0/53687091200:1/256m:0/36507222016:1/256m:0/48586817536:1/256m:0/3489660928:1/256m:0/86436216832:1/256m:0/70866960384:1/256m:0/163477192704:1/256m:0/96099893248:1/256m:0/17985175552:1/256m:0/22817013760:1/256m:0/30064771072:1/256m:0/15300820992:1/256m:0/61740154880:1/256m:0/16911433728:1/256m:0/64961380352:1/256m:0/21206401024:1/256m:0/30870077440:1/256m:0/49660559360:1/256m:0/47513075712:1/256m:0/6710886400:1/256m:0/5637144576:1/256m:0/1879048192:1/256m:0/71940702208:1/256m:0/34896609280:1/256m:0/25232932864:1/256m:0/42949672960:1/256m:0/12079595520:1/256m:0/58787364864:1/256m:0/11005853696:1/256m:0/31943819264:1/256m:0/15837691904:1/256m:0/76772540416:1/256m:0/24427626496:1/256m:0/16642998272:1/256m:0/4831838208:1/256m:0/17179869184:1/256m:0/34628173824:1/256m:0/70330089472:1/256m:0/20937965568:1/256m:0/21474836480:1/256m:0/22548578304:1/256m:0/8321499136:1/256m:0/87509958656:1/256m:0/33017561088:1/256m:0/2952790016:1/256m:0/2415919104:1/256m:0/42949672960:1/256m:0/79725330432:1/256m:0/48586817536:1/256m:0/4563402752:1/256m:0/5905580032:1/256m:0/20669530112:1/256m:0/17179869184:1/256m:0/4563402752:1/256m:0/121064390656:1/256m:0/41875931136:1/256m:0/63082332160:1/256m:0/13958643712:1/256m:0/17985175552:1/256m:0/46707769344:1/256m:0/1342177280:1/256m:0/23085449216:1/256m:0/38654705664:1/256m:0/47244640256:1/256m:0/5100273664:1/256m:0/77846282240:1/256m:0/17179869184:1/256m:0/18522046464:1/256m:0/40533753856:1/256m:0/83483426816:1/256m:0/1342177280:
1/256m:0/61471719424:1/256m:0/61740154880:1/256m:0/100126425088:1/256m
> --output-format=terse
That's correct, there's an imposed limit of 64 zones. The only issue with
lifting that limit is that it severely bumps the size of the packed
variant of the thread options. Going from 64 to 256 would make that
about 9k larger. Just an on-wire thing, so not a huge concern.
I'll make the change.
--
Jens Axboe
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