-----Original Message----- From: Antti Kantee [mailto:po...@fixup.fi] Sent: Wednesday, July 23, 2014 5:37 PM To: Kavanagh, Mark B; dev at dpdk.org Subject: Re: [dpdk-dev] Performance - linking against DPDK shared vs static libraries
On 23/07/14 15:58, Kavanagh, Mark B wrote: >> Hi, >> >> I build a switching application, which links against DPDK shared libraries; >> when I run the application, I see throughput of X. I then build the >> application again, except this time I link against DPDK shared libraries, >> having modified the application's build parameters appropriately. In this >> case, I see a performance drop of around .04%, which given the high >> throughput of the application is significant. >> >> Is such performance degradation to be expected when using DPDK shared >> libraries, and if not, are there any best-known methods for preventing >> performance degradation, assuming that I may be constrained to using shared >> libraries going forward? >Do you mean .04% or 4%? I would be more inclined to believe the latter. >Shared libraries are inherently slower due to indirection from PIC, and being >required to use them seems like a silly constraint in the context of >high-performance computing. > - antti It's actually the former, and I agree with your assertion regarding the constraint! I take it from your response then that the performance drop when using shared libraries is expected behavior? -------------------------------------------------------------- Intel Shannon Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 Business address: Dromore House, East Park, Shannon, Co. Clare This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
