Hi Philip: Thanks for you replying. Can you explain the case of "may step on itself" more detail ? 在 2015/1/30 16:48, Philip Keogh 写道: > On Wed, Jan 28, 2015 at 5:36 PM, majun (F) <majun258@xxxxxxxxxx> wrote: >> Hi All: >> I met a problem while testing the ramdisk peformance using fio. >> The platform is arm64 , fio version is 2.1.10. >> >> The ramdisk is enabled on my platform , so there are dev/ram0 ...to dev/ram15 totall 16 ramdisk devices. >> I tried to test these ramdisks performance uisng the script file list as below. >> >> #!/bin/bash >> ... >> fio --time_based ... --runtime=$runtime ... & >> done >> sleep $runtime >> done >> ... >> But the test result is not ok. >> The error log is: >> ... >> > > Have you tried sleeping for slightly longer then the runtime passed to fio? > > As a result of implementation details and the simple fact that sleep > isn't exact, nor is fio's runtime, a script not allowing a sufficient > buffer between backgrounded fio operations but intending to run > operations sequentially may step on itself. > -- > To unsubscribe from this list: send the line "unsubscribe fio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
