By analysis, I mean that fio would output throughput numbers (such as mb/s, iops) and latency numbers (slat - submission latency, clat - completion latency) --- Hsiao "Shao" Su 650 287 2545 (W) -----Original Message----- From: Alireza Haghdoost [mailto:haghdoost@xxxxxxxxx] Sent: Friday, February 11, 2011 10:23 AM To: Hsiao Su Cc: linux-btrace@xxxxxxxxxxxxxxx Subject: Re: replaying blktrace using fio on a different device What king of analysis you did you mean ? Alireza Haghdoost On Fri, Feb 11, 2011 at 21:16, Hsiao Su <Hsiao.Su@xxxxxxxxxxxxx> wrote: > > Didn't know about btreplay. ÂBut I just read its man page. ÂLooks like btreplay will only replay the workload, but does not provide any analysis. ÂIt can replay workload on a different device. > > In fio, there's a parameter called read_iolog, where you can specify blktrace's binary output files. ÂFio will replay this workload and provide analysis. > > In fio v1.50, there's an additional parameter called replay_redirect. ÂYou can use this to specify a different device. ÂNote that this is not documented in fio's man page, but it is documented in the HOWTO file. ÂI found this option by search archives of this mailing list. > > --- > Hsiao "Shao" Su > 650 287 2545 (W) > > > -----Original Message----- > From: Alireza Haghdoost [mailto:haghdoost@xxxxxxxxx] > Sent: Thursday, February 10, 2011 9:27 PM > To: Hsiao Su > Cc: linux-btrace@xxxxxxxxxxxxxxx > Subject: Re: replaying blktrace using fio on a different device > > Why you do not use btreply ? it has a mapping device option. > Would you please let me know how you reply a trace using fio ? > > > Alireza Haghdoost > Graduate Student > Department of Computer Engineering > Sharif University of Technology > http://ce.sharif.edu/~haghdoost > Phone: (98) (21) 6616 6689 > > > > > > On Fri, Feb 11, 2011 at 02:57, Hsiao Su <Hsiao.Su@xxxxxxxxxxxxx> wrote: > > > > Does anyone know if this is possible? I'd like to record io workload using blktrace for one device, and then use fio to replay it on a different device that's on a different machine. > > > > My brief experiment seems to say no. If I record it using /dev/sda, then when replaying it, /dev/sda must be there. > > > > Basically, I'm trying to see how two different io subsystems measure up, using a real application's workload. > > > > --- > > Hsiao "Shao" Su > > 650 287 2545 (W) > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-btrace" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at Âhttp://vger.kernel.org/majordomo-info.html > > ÿô.nlj·Ÿ®‰†+%ŠË±é¥Šwÿº{.nlj·¥Š{±ýŠ{ayº ÊÚë¢f£¢·hšïÿ‘ê_è(éŠÝj"ú§ÿÿ¾«þG«é¸?™¨è&£ø
