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nvme/perf: add lto

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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: John Kariuki <John.K.Kariuki@intel.com>
Change-Id: I1af4033144dd9f7594bcf40621acb7fb52018e7a
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/459330
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
John Kariuki 2019-06-25 09:42:33 -07:00 committed by Ben Walker
parent f056bc6524
commit 851830c366
1 changed files with 9 additions and 0 deletions
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test/nvme/perf/README.md
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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.