Commit 851830c3 authored by John Kariuki's avatar John Kariuki Committed by Ben Walker
Browse files

nvme/perf: add lto 



Updated doc to include section on how to compile SPDK with link
time optimization (lto) gcc flag prior to running the benchmark.

Signed-off-by: default avatarJohn Kariuki <John.K.Kariuki@intel.com>
Change-Id: I1af4033144dd9f7594bcf40621acb7fb52018e7a
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/459330


Reviewed-by: default avatarChangpeng Liu <changpeng.liu@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
parent f056bc65

test/nvme/perf/README.md

+9 −0
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# Automated script for NVMe performance test



## Compile SPDK with LTO



The link time optimization (lto) gcc flag allows the linker to run a post-link optimization pass on the code. During that pass the linker inlines thin wrappers such as those around DPDK calls which results in a shallow call stack and significantly improves performance. Therefore, we recommend compiling SPDK with the lto flag prior to running this benchmark script to archieve optimal performance.

Link time optimization can be enabled in SPDK by doing the following:



~{.sh}

./configure --enable-lto

~



## Configuration

Test is configured by using command-line options.