[dpdk-users] Is DPDK compatible with C++11 threads?

[David Aldrich]

Hi Nick and Keith

Thank you both for your replies, they were very helpful.

Referring again to the helloworld example, we see that multiple threads are launched:

 RTE_LCORE_FOREACH_SLAVE(lcore_id)
 {
    rte_eal_remote_launch(lcore_hello, NULL, lcore_id);
 }

In our case, where our application is running C++11 threads, would I launch one dpdk thread for the dpdk process and launch my other threads as C++11 threads as before?

One of those C++11 threads will process my network data.  Will the dpdk’s locks and shared memory mechanisms allow this?

I realise that I am demonstrating a lack of understanding of the basics of how dpdk works, but I am just starting to understand it.

With best regards

David

From: Pavey, Nicholas [mailto:npavey at akamai.com]
Sent: 08 November 2016 17:23
To: Wiles, Keith <keith.wiles at intel.com>; David Aldrich <David.Aldrich at EMEA.NEC.COM>
Cc: users at dpdk.org
Subject: Re: [dpdk-users] Is DPDK compatible with C++11 threads?

I’ve built the DPDK along with code in both C and C++. It works fine as long as you get the linkage between the languages correct and make sure that you don’t pass C++ headers into files compiled with the C compiler.

I did try building the DPDK itself with the “g++” compiler (v4.8.4, Ubuntu 14.04, 64bit), and I wasn’t able to get that working out of the box. I got hundreds of warnings, but I didn’t take the time to debug it – it’s possible that a few point fixes in the build system / DPDK code might yield a clean compile.

Thanks,


Nick

From: "Wiles, Keith" <keith.wiles at intel.com<mailto:keith.wiles at intel.com>>
Date: Tuesday, November 8, 2016 at 12:04 PM
To: David Aldrich <David.Aldrich at EMEA.NEC.COM<mailto:David.Aldrich at EMEA.NEC.COM>>
Cc: "users at dpdk.org<mailto:users at dpdk.org>" <users at dpdk.org<mailto:users at dpdk.org>>
Subject: Re: [dpdk-users] Is DPDK compatible with C++11 threads?


On Nov 8, 2016, at 5:12 AM, David Aldrich <David.Aldrich at EMEA.NEC.COM<mailto:David.Aldrich at EMEA.NEC.COM>> wrote:
Hi
As a beginner with DPDK, I want to consider how we can convert an existing Linux application from using the kernel network stack to using DPDK.
This existing app is multi-threaded, using the C++11 thread, mutex etc. classes.  We assign threads to cores by calling pthread_setaffinity_np().
I have looked at the DPDK helloworld application and see that it launches threads using the DPDK API:
               /* call lcore_hello() on every slave lcore */
               RTE_LCORE_FOREACH_SLAVE(lcore_id) {
                              rte_eal_remote_launch(lcore_hello, NULL, lcore_id);
               }
If we use DPDK, can we retain our existing C++11 threads or are we obliged to use the DPDK threading APIs exclusively?

You should be able to use the standard C++11 threads I believe, in DPDK we are just using pthreads and set affinity to lock a thread to a core. You can still use pthreads in your application.

Perhaps a more basic question is applicable: is DPDK compatible with C++?

I believe building DPDK with C++ code does work,  but I have not tried it myself.

Best regards
David
Best regards
David

Regards,
Keith




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