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:[email protected]]
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:[email protected]>>
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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