redhat-rpm-config/macros.build-constraints

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# Macros to constrain resource use during the build process
# outputs build flag overrides to be used in conjunction with
# %%make_build, %%cmake_build etc.
#
# if no override is needed, this macro outputs nothing
#
# - m memory limit in MBs per core; default is 1024
#
# Usage:
# e.g. %make_build %{limit_build -m 2048}
# => /usr/bin/make -O -j16 V=1 VERBOSE=1
# %make_build %{limit_build -m 40960}
# => /usr/bin/make -O -j16 V=1 VERBOSE=1 -j1
#
%limit_build(m:) %{lua:
local mem_per_process=rpm.expand("%{-m*}")
if mem_per_process == "" then
mem_per_process = 1024
else
mem_per_process = tonumber(mem_per_process)
end
local mem_total = 0
for line in io.lines('/proc/meminfo') do
if line:sub(1, 9) == "MemTotal:" then
local tokens = {}
for token in line:gmatch("%w+") do
tokens[#tokens + 1] = token
end
mem_total = tonumber(tokens[2])
break
end
end
local max_jobs = mem_total // (mem_per_process * 1024)
if max_jobs < 1 then
max_jobs = 1
end
cur_max_jobs=tonumber(rpm.expand("%{_smp_build_ncpus}"))
if cur_max_jobs > max_jobs then
print("-j" .. max_jobs)
end
}