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Questions tagged [blktrace]

blktrace is a block layer IO tracing mechanism which provides detailed information about request queue operations up to user space.

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How to get better performance for local SSD disk on GKE?

I'm running a sysbench OLTP benchmark with TiDB on GKE local SSD disk. But I'm getting poor performance compared to GKE persistent SSD disk. How can I get the expected IOPS performance on GKE local SSD disk by default? I've run TiDB OLTP benchmark…
tennix
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blktrace output error in docker container

my docker container base image is ubuntu, and I ran it with full privilege options that means in run command I use these switches: --cap-add=SYS_ADMIN --security-opt apparmor:unconfined I wanna use blktrce using below command: sudo blktrace -d / -a…
mR.aTA
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How to get the blktrace tool to show the D - issued action

This question is about the blktrace tool. On several Ubuntu 3.16.0 machines in our lab I need to trace the software vs device block IO performance. We sometimes use our custom nvme driver and sometimes the standard one. Here is a excerpt of the…
jimm
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Linux io_submit latency large

I find one very strange probelm with io_submit latency. If I write a loop invoke io_submit 5 times, like following: for (int i = 0; i < 5; i++) { gettimeofday(&start); io_submit(...); gettimeofday(&end); } The latency of io_submit are all…
haipeng31
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FIO Latency Vs Btt latency

in case of btt results, i am most familiar with Q2D latency - time from request submission to Device D2C latency - Device latency for processing request Q2C latency - total latency , Q2D + D2C = Q2C i need help comparing latencies reported by…
ankit patel
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How to execute the io trace generated by DiskSim in real environment?

I want to compare different disk models using DiskSim. In many studies using DiskSim, researchers execute the trace files generated by DiskSim on both DiskSim and real devices. However, I didn't find out how to do so. Therefore, I want to find the…
Yizhou Yan
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Can blktrace only trace one specific process?

Can blktrace only trace one specific process? Right now blktrace dump out all io activity out, which takes a lot of time using blkparse to parse it. But we are only interested in one particular process. Is there any way to configure blktrace to…
bilbao
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why does not btt in blktrace tool report any data

The btt report is as below： /ssd/blktrace/btt/btt -i parse.bin ==================== All Devices ==================== ALL MIN AVG MAX N --------------- ------------- ------------- -------------…
Jun
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How to execute shell scripts with blktrace commands in android programmatically?

I have a rooted android device with blktrace installed in it. I want to execute a shell script for testing blktrace from my application. I have tried some solutions found in some resources from internet. I have tried these two methods for executing…
Khaled Saifullah
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understanding blktrace from fio tests

I purchased a virtual server that had 8 vCPUs, 16G memory, and a 500G ssd volume (which is backed by ceph rbd). Then I used fio to test the server's IO performance. To better understanding the fio results, during the test, I also used blktrace to…
Ning
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blkparse how to show IO Scheduler message

blktrace version v2.0.0 note: in blkparse output, the m in the sixth column indicate the line is scheduler information. On Ubuntu 16.04 ext4 I can see the IO Scheduler message, blktrace -d /dev/sda -o - | blkparse -i - 8,0 3 1 …
Honghe.Wu
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fread and fwrite return values does not match blktrace output

I'm doing some experiment on SSDs to check weather they have data loss under power fault. At the first step I write a random data on SSD and then in the next step I inject a power fault to it. At the end I read from the SSD and check weather the…
Mehrshad Lotfi Foroushani
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Latency using struct bio

I want to draw latency information for each struct bio that passes through the block layer. I have a module that overrides make_request_fn. I would want to find out how long did that bio took from there to reach request queue and from there to…
humble_fool
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difference is the data of queue depth , disk offset, iops, throughput during analysis of blktrace

Traces of the IOS are captured using blktrace and same is being replayed using blkreplay. I want to check the parameters like throughput , queue depth and IOS so we are using the tools like seekwatcher and iowatcher. There is a huge difference in…
Chandan Jayaram
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How can I get the disk IO trace with actual input values?

I want to generate some trace file from disk IO, but the problem is I need the actual input data along with timestamp, logical address and access block size, etc. I've been trying to solve the problem by using the "blktrace | blkparse" with "iozone"…
lwy
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