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Merge pull request #40068 from tchaikov/wip-readme-ninja

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README.md: correct notes on `-j` option

Reviewed-by: Radoslaw Zarzynski <rzarzyns@redhat.com>
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Kefu Chai 2021-03-12 22:22:37 +08:00 committed by GitHub
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@ -62,12 +62,13 @@ be up to 5x slower with some workloads. Please pass
"-DCMAKE_BUILD_TYPE=RelWithDebInfo" to do_cmake.sh to create a non-debug
release.)
(Note: `ninja` alone will use only one CPU thread, this could take a while. use
the `-j` option to use more threads. Something like `ninja -j$(nproc)` would be
a good start.
(Note: the number of jobs used by `ninja` is derived from the the number of
CPU cores of the building host if unspecified. Use the `-j` option to limit
the job number if the build jobs are running out of memory. On average, each
job takes around 2.5GiB memory.
This assumes you make your build dir a subdirectory of the ceph.git
checkout. If you put it elsewhere, just point `CEPH_GIT_DIR`to the correct
checkout. If you put it elsewhere, just point `CEPH_GIT_DIR` to the correct
path to the checkout. Any additional CMake args can be specified setting ARGS
before invoking do_cmake. See [cmake options](#cmake-options)
for more details. Eg.