I simply tested the BlobFS Asynchronous API by using SPDK events framework to execute multi tasks, each task writes one file.
But it doesn't work, the spdk_file_write_async() reported an error when resizing the file size.
The call stack looks like this:
spdk_file_write_async() -> __readwrite() -> spdk_file_truncate_async() -> spdk_blob_resize()
The resize operation must be done in the metadata thread which invoked the spdk_fs_load(), so only the task dispatched to the metadata CPU core works.
That's to say only one thread can be used to write files. It's hard to use, and performance issues may arise.
Does anyone knows further more about this?
thanks very much
First of all, thanks to everyone for you continued participation and contributions to SPDK over the years. I am personally very proud to be a part of this community and I know I’m not alone with that sentiment 😊 Now I’d like to take a minute to remind everyone why SPDK is so successful and how we, as community members, can help make sure it stays that way:
* Review, review, review! Reviews are everyone’s job (not just maintainers). Although our maintainers are the gate keepers to the repo, they need everyone’s help in reviewing the growing number of patches we see year over year. A few points on reviews to keep in mind:
* You don’t have to be an expert on the code in question to provide a helpful review for the author.
* Simply asking questions about what the patch is trying to do can be a big help.
* If the problem that patch is trying to solve isn’t clear to you of if the commit message is hard to understand, ask for clarification.
* If you see style inconsistencies or typos in comments, helping identify those before maintainers review can save them a lot of time - time they can spend on your patches 😉
* And, of course, if you know the code in question well, feel free to question the implementation and/or suggest alternatives.
* Stay involved on Slack:
* Just like with reviews, you don’t need to have all the answers to engage. Ask questions to help understand the question or scenario, this will help others jump in as well
* Feel free to tag another community member who you might think can help even if you can’t.
* If you have questions yourself, remember there’s no such thing as a bad question! We are all part of the same community and are all here to help one another.
* Watch for GitHub issues:
* Who fixes bugs? We all do!
* Attend the weekly community meeting that works for your time zone. It’s a great place to pick-up cool work and learn debugging techniques as well.
* Attend community events:
* We’ve not had many of these in the last few years for obvious reasons but we hope to have a developer meeting sooner than later… but we *do* have a virtual Hackathon coming up April 28th so be sure to register here<https://teams.microsoft.com/registration/iI3JRkTj1E6Elk7XcS4lXQ,kemVK8232...>, come join the fun!
It seems that SPDK development focuses on nvmeof protocol recently. We would like to ask if SPDK will have any plan to support ALUA in iSCSI protocol in the feature. If yes, could you let us know when SPDK will support ALUA in iSCSI protocol.?
Thank you so much.
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Currently, I want to build an SPDK backend for our app, which has multiple processes created by fork. To this end, we would like to create a process dedicated to SPDK for doing the IO work, for example, retrieving data from NVME and sending the data to other processes, or collect requests from other processes and sending data to NVME. However, SPDK doesn't support shared memory between native processes, so we intend to use the ring on shared memory (shm_open, etc.) for sending the request from other processes to the SPDK process. The difficulty is how the process running SPDK can achieve the zero-copy, which means, instead of copying the data from NVME disk to the process running SPDK and then copying it to shared memory, then copy it to the target process, we want the process running SPDK copy the data from NVME directly to the target process. Do you have any idea how we can achieve such stuff?
We’re excited to announce the SPDK Community Hackathon will be held virtually on April 28th,2022 8am to 12:30pm PDT.
Hackathon will be focused on NVMe vfio-user : overview of the architecture, its threat model, and how to improve and extend testing (including fuzzing) of the SPDK nvme vfio-user target stack.
Register today to collaborate with other community developers for technical and interactive discussions.
Registration link in the Blogpost : https://spdk.io/news/2022/03/22/Hackathon/
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I'm new to SPDK and I'm trying to figure out how to use it from a host to connect to a Discovery Controller. More precisely, I'm looking at the recently ratified TP8010, which defines the Central Discovery Controller (CDC). My goal is to establish a persistent connection to a CDC over TCP, to perform Get Discovery Log Page commands, and monitor for "Discovery Log Page Changed" AENs.
I've been reading the documentation and I have a few questions. My first question is about polling. The documentation mentions that the SPDK driver uses polling instead of interrupts to avoid the overhead of context switches. And avoiding context switches results in better performances. I'm curious about how polling is done. Is polling performed continuously in a tight loop without any blocking? In other words, does polling consume 100% CPU? Having processes that consume large amounts of CPU is not something that I can afford on my host. Is there a way to operate in interrupt mode instead? That is, can I use a blocking poll() (or epoll() or select()) on the file descriptor associated with the socket connection?
My second question is about AENs and how they are handled. AENs, by definition, are asynchronous. What if an AEN is sent while I issue a command? For example, let's say I issue a Get Discovery Log Page (DLP) command and at the very same time the CDC sends an AEN. I was looking at the code and it looks like when one issues a command the SPDK starts polling for the response. In this case, the SPDK would not get the response to the Get DLP command, but instead would get an AEN. How is that handled? Is the AEN just discarded?