Hi, Just refreshing the original question in hopes of an answer... Can FIO for Windows replay an output file from blktrace/blkparse? I need the ability to replay cmds from bus traces with the same timing as found in a SAS/SATA bus trace. This is in order to use FIO to mimic the original read/write cmd workload as closely as possible so that I can reproduce customer performance problems on the bench. My goal is to create/synthesize a replay file that contains the cmds and the timing of the cmds and use FIO to replay it using read_iolog. My experience is that I cannot accomplish my goal by using a standard iolog such as the following because the WAIT statement does not work as documented in the FIO user guide. I have done several experiments trying to understand the behavior of the WAIT statement and it simply will not work to control the timing of the cmds in a way that will match the original timing found in the bus trace. Therefore I need a different solution. fio version 2 iolog \.\PhysicalDrive0 add \.\PhysicalDrive0 open \.\PhysicalDrive0 read 603182858240 131072 \.\PhysicalDrive0 wait 1000 0 \.\PhysicalDrive0 read 7403516723200 131072 \.\PhysicalDrive0 wait 1000 0 \.\PhysicalDrive0 read 8432532848640 131072 \.\PhysicalDrive0 wait 1000 0 \.\PhysicalDrive0 write 4700536045568 131072 \.\PhysicalDrive0 wait 1000 0 \.\PhysicalDrive0 read 4019454869504 131072 \.\PhysicalDrive0 wait 1000 0 \.\PhysicalDrive0 read 8401981407232 131072 \.\PhysicalDrive0 read 3805264740352 131072 \.\PhysicalDrive0 read 3535500869632 131072 \.\PhysicalDrive0 close >From reading the FIO User's Guide it appears that FIO will try to enforce the cmd timing of a replay file if it was created using the Linux "blktrace/blkparse" tools. The output from blkparse contains records of cmds along with timestamps. FIO apparently will use the timestamps of cmds to control the timing of when it will send an I/O. This is exactly what I need. However, blktrace/blkparse are Linux tools. I need to be able to run the FIO replay on a Windows machine and I have not had success trying to use a blkparse output file as an iolog on Windows. QUESTIONS: 1. Does FIO support using a blkparse output file as an iolog/replay file on FIO for Windows... or does this ONLY work on FIO for Linux? 2. If it does work on FIO for Windows, can you please send me a short example blkparse file so that I can study it and use it as a model (i.e. the format) for how I would synthesize a blkparse output to suit my needs? Regards, Greg Greg Frees Lead Performance Engineer Senior Technologist HGST, a Western Digital brand 5601 Great Oaks Parkway San Jose, CA 95138 Email: greg.frees@xxxxxxxx Office: +1-408-717-7852 www.hgst.com #LongLiveData -- 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
